CN103326126A - Leaking transmission wire and MIMO communication system based on same - Google Patents
Leaking transmission wire and MIMO communication system based on same Download PDFInfo
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- CN103326126A CN103326126A CN2012100745744A CN201210074574A CN103326126A CN 103326126 A CN103326126 A CN 103326126A CN 2012100745744 A CN2012100745744 A CN 2012100745744A CN 201210074574 A CN201210074574 A CN 201210074574A CN 103326126 A CN103326126 A CN 103326126A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 109
- 238000004891 communication Methods 0.000 title claims abstract description 55
- 238000009958 sewing Methods 0.000 claims description 247
- 239000004020 conductor Substances 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000011159 matrix material Substances 0.000 description 43
- 230000008859 change Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 230000001143 conditioned effect Effects 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005562 fading Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
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- 238000010295 mobile communication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/20—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by the transmission technique; characterised by the transmission medium
- H04B5/28—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by the transmission technique; characterised by the transmission medium using the near field of leaky cables, e.g. of leaky coaxial cables
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/20—Non-resonant leaky-waveguide or transmission-line antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/203—Leaky coaxial lines
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/20—Non-resonant leaky-waveguide or transmission-line antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/22—Longitudinal slot in boundary wall of waveguide or transmission line
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/28—Combinations of substantially independent non-interacting antenna units or systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
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Abstract
The invention discloses a leaking transmission wire and an MIMO communication system based on the leaking transmission wire. The leaking transmission wire comprises leaking sections and non-leaking sections, wherein the leaking sections and the non-leaking sections are alternated. By means of the leaking transmission wire is used, even if the space between leaking transmission wires is very small, sent data can be reconstructed at a receiving terminal, and therefore MIMO communication of a high data rate is achieved.
Description
Technical field
The present invention relates to wireless communication field, particularly a kind of transmission line of sewing reaches based on the MIMO communication system of sewing transmission line.
Background technology
Radio communication is because there are many disputes in its limited wireless frequency spectrum with complicated wireless transmission environment (mainly referring to decline and multipath) in application.Now, multiple-input and multiple-output (MIMO) may be the most important technology that wireless communication standard (for example 3G, 3G LTE, IEEE 802.16 and IEEE 802.11n) adopts.Usually, channel fading is considered to the unfavorable factor in the mobile communication system, and the MIMO technology can significantly overcome channel fading by adopting many antennas at transmitting terminal and receiving terminal, thereby improves throughput and reliability.
Recently, the WLAN technology often is selected as the wireless driverless train control (ATC) of subway system and the basis of passenger information system (PIS).That the user wishes the wireless communication standard that adopts based on the IEEE 802.11n of MIMO-OFDM technology, in order to provide higher data rate for the PIS system.Yet, for sufficient throughput is provided, 802.11n have to operate at multithread (multi-stream) MIMO pattern, this just requires transmitting terminal and receiving terminal to have a plurality of antennas, and require all sending/receivings (TX/RX) antenna between have incoherent multipath channel, more precisely, be (well-conditioned) channel matrix with good attitude.Wherein, the element in the channel matrix by send/receive antenna between the transmission coefficient form.Channel matrix has good attitude and refers to that this channel matrix has inverse matrix, and can rebuild the data that send at receiving terminal by this inverse matrix.
Carry out the application of wireless coverage for ask for something along clearly defined (well-defined) path, leaky coaxial cable has more advantage than traditional antenna.Fig. 1 shows the basic structure of a kind of leaky coaxial cable of prior art.Be different from common coaxial cable, the slit is set on the outer contact of leaky coaxial cable equably, so that radiation signal as far as possible equably.As shown in Figure 1, the adjacent domain of cable can also be propagated/be radiated to less radio-frequency (RF) signal that feeds back to leaky coaxial cable can not only at the internal communication of cable, to a certain extent by the surface of cable; Equally, the RF signal that incides cable surface also can be to a certain extent at the internal communication of cable.Like this, leaky coaxial cable just can bleed or spills the RF signal along whole cable length by the slit on the outer contact, therefore can be considered to a kind of antenna of specific type.The wireless coverage of typical leaky coaxial cable only limits to the close region (for example, within several meters) of cable, therefore can avoid the interference of other system.The typical application scenarios of leaky coaxial cable comprises tunnel, aerial transporter etc.
Yet, when in the MIMO communication system, adopting single leaky coaxial cable, because be equivalent to only adopt an antenna, so be difficult to improve the throughput of system, also be difficult to rebuild the MIMO data flow at receiving terminal.And for the several leaky coaxial cables that are arranged in parallel and closely move, because the transmission coefficient in the channel matrix is closely similar, so although channel matrix has inverse matrix, each very little error (noise) can greatly affect the reconstruction of MIMO data flow.Therefore, channel matrix will be difficult to meet the requirement (poorly conditioned) of MIMO transmission, to such an extent as to can not rebuild the MIMO data flow at receiving terminal.
In order to rebuild the MIMO data flow at receiving terminal, a kind of method that prior art can adopt is to get a plurality of leaky coaxial cables interval fully far away.But this scheme is also impracticable under many circumstances, and for example in the scene of limited space, what a plurality of leaky coaxial cables can not the interval is far.Certainly, here said leaky coaxial cable also can be also can with other sew transmission line (such as leaky waveguide etc.) replace.The result of the test that provides in this way WLAN to cover in aircraft nacelle is disclosed in following document to some extent:
M.Lieberei，C.Zimmermann，P.Beinschob，U.Zoelzer：“MIMO?WIRELESS?COMMUNICATION?IN?AN?AIRCRAFT?USING?OMNIDIRECTIONAL?AND?LEAKY?LINE?ANTENNAS”，Workshop?on?Aviation?System?Technology?2009.
Therefore, the problem to be solved in the present invention is, for use the system of transmission line of sewing in the scene of limited space, how to obtain to support the wireless channel of high data rate MIMO communication, wherein, in the scene of limited space, sew and transmit that the interval is very near each other.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of transmission line of sewing to reach based on the MIMO communication system of sewing transmission line.
For achieving the above object, technical scheme of the present invention specifically is achieved in that
A kind of transmission line of sewing comprises the section of sewing and the non-section of sewing, and sews the Duan Yufei section of sewing alternately.
One embodiment of the present invention are that the length of the described section of sewing and the non-section of sewing is in the same order of magnitude.
One embodiment of the present invention are that the described non-section of sewing obtains according to following mode:
With the cancellation of the slit on the external conductor of the existing line segment corresponding with the described non-section of sewing of sewing transmission line, perhaps
Place conductive sleeve at the existing line segment corresponding with the described non-section of sewing of sewing transmission line, perhaps
With the slit covering metal band on the external conductor of the existing line segment corresponding with the described non-section of sewing of sewing transmission line.
One embodiment of the present invention are, when described transmission line and other of sewing sewed transmission line when jointly using, describedly sew transmission line and other sews the transmission line parallel arranged, and this section of sewing of sewing transmission line spatially is in same position with other any one non-section of sewing of sewing transmission line, and this non-section of sewing of sewing transmission line spatially is in same position with other any one section of sewing of sewing transmission line.
One embodiment of the present invention are that the described transmission line of sewing is leaky coaxial cable or leaky waveguide.
A kind of MIMO communication system based on sewing transmission line comprises access point and client, wherein access point with sew transmission line more than two and link to each other, sew transmission line for every and comprise the section of sewing and the non-section of sewing, and sew the Duan Yufei section of sewing and replace.
One embodiment of the present invention are, the described transmission line of sewing more than two is when arranging, article one, the section of sewing of sewing transmission line spatially is in same position with other any one non-section of sewing of sewing transmission line, this section of sewing of sewing transmission line spatially is in same position with other any one non-section of sewing of sewing transmission line, and this non-section of sewing of sewing transmission line spatially is in same position with other any one section of sewing of sewing transmission line.
One embodiment of the present invention are, the described length of sewing the section of sewing of transmission line more than two is identical or different, and the described length of sewing the non-section of sewing of transmission line more than two is identical or different.
One embodiment of the present invention are, have overlapping between the described section of sewing of sewing transmission line more than two, perhaps have overlapping between the described non-section of sewing of sewing transmission line more than two, perhaps between the described section of sewing of sewing transmission line more than two and all have between the non-section of sewing overlapping, perhaps equal zero lap between the described section of sewing of sewing transmission line more than two and between the non-section of sewing.
One embodiment of the present invention are, described client links to each other with two above antennas, and the described length of distance between transmission line and the described antenna, the spacing between the described antenna, the described section of sewing of sewing transmission line and the non-section of sewing of sewing is on the same order of magnitude.
One embodiment of the present invention are that the described transmission line of sewing is leaky coaxial cable or leaky waveguide.
As seen from the above technical solution, the present invention proposes sews transmission line and can change the radiation characteristics that tradition is sewed transmission line, so even the spacing of sewing between transmission line is very little, also can rebuilds the data that send at receiving terminal, thereby realize the MIMO communication of high data rate.
Description of drawings
Fig. 1 shows the basic structure of a kind of leaky coaxial cable of prior art;
The employing antenna that Fig. 2 shows prior art carries out the basic structure of the 2X2 MIMO communication system of MIMO communication;
The employing tradition leaky coaxial cable that Fig. 3 shows prior art carries out the basic structure of the 2X2 MIMO communication system of MIMO communication;
The improved leaky coaxial cable of employing that Fig. 4 shows the embodiment of the invention carries out the basic structure of the 2X2 MIMO communication system of MIMO communication;
Fig. 5 shows the arrangement mode of many improved leaky coaxial cables of the embodiment of the invention.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, referring to the accompanying drawing embodiment that develops simultaneously, the present invention is described in more detail.
The employing antenna that Fig. 2 shows prior art carries out the basic structure of the 2X2 MIMO communication system of MIMO communication.This MIMO communication system comprises access point (AP) and client (STA)." 2X2 " refers to that AP and STA have configured respectively two antennas.At any time, two antennas of AP can be used as transmitting antenna, and two antennas of STA are as reception antenna; Perhaps two of STA antennas are as transmitting antenna, and two antennas of AP are as reception antenna.For the ease of understanding, following embodiment and accompanying drawing all describe as an example of 2X2 MIMO communication system example.It will be understood by those skilled in the art that the present invention is equally applicable to have other aerial array (for example, 2X3,3X3,4X4 ...) the MIMO communication system.
In MIMO communication system shown in Figure 2, the distance between two antennas of AP is d
AP, the distance between two antennas of STA is d
STA, L is the distance between the antenna of the antenna of AP and STA.For convenience of description, two of AP antennas are designated as respectively i
1And i
2, two antennas of STA are designated as respectively j
1And j
2Antenna i
1With antenna j
1Between the transmission coefficient be h
1,1, antenna and i
1With antenna j
2Between the transmission coefficient be h
1,2, antenna and i
2With antenna j
1Between the transmission coefficient be h
2,1, antenna and i
2With antenna j
2Between the transmission coefficient be h
2,2Thus, the channel matrix between AP and the STA is:
Briefly, channel matrix H is commonly used to describe amplitude and the phase place of signal transmission between effect that signal propagates and two antennas, and the separation of each initial data that therefore sends by different antennas depends on the characteristics of channel matrix H.If channel matrix H is in good attitude (well-conditioned), the initial data that sends can be rebuild from the data that receive by the inverse matrix of this channel matrix.In pure sight line (line-of-sight) situation (namely, there is not significant multipath transmisstion), if the spacing between the spacing between the distance L between the antenna of the antenna of AP and STA and the antenna of STA and the antenna of AP is compared very long, then the channel transmission system between the antenna of the antenna of AP and STA is with closely similar, be that element in the channel matrix H has closely similar amplitude and phase place, this moment, channel matrix H can not have the inverse matrix that can rebuild initial data.If very short distance is moved in a transmission or reception antenna, then can affect amplitude and the phase place of corresponding a row or column element in the channel matrix H.For example, with the antenna i of AP
1Mobile very short distance, then transmission coefficient h
1,1And h
1,2To change, and the antenna j of mobile STA
1, transmission coefficient h then
1,1And h
2,1To change, and that is to say, the amplitude of these elements and phase place can change.But, because the distance L between the antenna of the antenna of the spacing between the antenna and AP and STA is compared very little, even so moved the very short distance of certain antenna, impact on the amplitude of the element in the channel matrix H and phase place also can be very little, therefore like this channel matrix will be difficult to meet the demands (poorly conditioned), namely in this case, be difficult to rebuild initial data at receiving terminal, the MIMO communication of high data rate is irrealizable.Yet, if the distance L between the antenna of the antenna of AP and STA has the similar order of magnitude to the spacing of antenna, then a mobile antenna will produce different impacts to the element (the particularly phase place of these elements) of corresponding row or column in the channel matrix H, this moment is according to geometry, must obtain the channel matrix of good attitude, thereby realize the MIMO communication of high data rate.
Above-mentioned principle also is applicable to adopt traditional MIMO communication system of sewing transmission line (for example leaky coaxial cable or leaky waveguide) rather than antenna at the AP end.This sentences leaky coaxial cable is that example describes.The employing tradition leaky coaxial cable that Fig. 3 shows prior art carries out the basic structure of the 2X2 MIMO communication system of MIMO communication.As shown in Figure 3, AP has configured two traditional leaky coaxial cable i
1And i
2, STA has configured two antenna j
1And j
2, the leaky coaxial cable i of AP
1And i
2Between distance be d
Cable, the distance between the antenna of STA is d
STA, the distance between the antenna of leaky coaxial cable and STA is L.According to MIMO communication system shown in Figure 3, the channel matrix between AP and the STA is:
If the distance L between the antenna of the leaky coaxial cable of AP and STA and the spacing d between the leaky coaxial cable
CableCompare very large, then the channel transmission system between the antenna of the leaky coaxial cable of AP and STA is with closely similar, be that element in the channel matrix H has closely similar amplitude and phase place, this moment, channel matrix H can not have the inverse matrix that can rebuild initial data.If leaky coaxial cable of AP or the antenna of STA are moved very short distance, then can affect amplitude and the phase place of corresponding a row or column element in the channel matrix H.But, because the distance L between the antenna of the spacing between the spacing between the leaky coaxial cable of AP or the antenna of STA and the leaky coaxial cable of AP and STA is compared all very little, even so moved certain leaky coaxial cable or the very little distance of antenna, impact on the amplitude of the element in the channel matrix H and phase place also can be very little, therefore such channel matrix will be difficult to meet the demands (poorly conditioned), generally be not suitable for the MIMO communication of high data rate, particularly when the radio transmission in the leaky coaxial cable is controlled by sight line rather than multipath usually.
Channel matrix for the MIMO communication that obtains to be applicable to high data rate, the embodiment of the invention has proposed a kind of improved transmission line of sewing, sew the radiation characteristics of transmission line by change, change amplitude and the phase place of element in the channel matrix, thereby obtain the channel matrix of good attitude.In the MIMO communication system, adopt this improved transmission line of sewing, even the spacing of sewing between transmission line is very little, also can rebuild the data that send at receiving terminal, thereby realize the MIMO communication of high data rate.For the ease of understanding, as an example of improved leaky coaxial cable example the improved transmission line of sewing is described in embodiments of the present invention.
In embodiments of the present invention, improved leaky coaxial cable comprises radiant section (radiating section) and non-radiative section (non-radiating section), and radiant section and non-radiative section are alternately, wherein radiant section is also referred to as the section of sewing (leaky section), and non-radiative section is also referred to as the non-section of sewing (non-leaky section).Because existing leaky coaxial cable is along whole cable length leakage signal, and the Duan Yufei section of sewing of sewing of the improved leaky coaxial cable that the embodiment of the invention proposes replaces, so in order to obtain the non-section of sewing, can be with the slit cancellation (omit) on the external conductor of the cut cable corresponding with the non-section of sewing of existing leaky coaxial cable.Cancelled owing to being used for the slit of leakage signal, so this cut cable leakage signal and become the non-section of sewing no longer.The mode of the non-section of sewing of this acquisition realizes in the production process of cable than being easier to.If in process of production not with the cancellation of the slit on the external conductor of the cut cable corresponding with the non-section of sewing of existing leaky coaxial cable, so alternatively, the non-section of sewing can also obtain in the following way: place conductive sleeve (for example metal tube, wire netting, sheet metal pipe etc.) at the cut cable corresponding with the non-section of sewing of existing leaky coaxial cable, perhaps with the slit covering metal band on the external conductor of the cut cable corresponding with the non-section of sewing of existing leaky coaxial cable.For example, enclose copper strips (strip of capper tape) in the outside of the cut cable corresponding with the non-section of sewing of existing leaky coaxial cable, like this, just the slit on this cut cable can be covered fully.The non-section of sewing that obtains by the way can both be avoided the clearance leakage signal on this section.The section of sewing of the leaky coaxial cable that the embodiment of the invention proposes and the length of the non-section of sewing can be identical, also can be different, as long as be in the same order of magnitude.
It will be understood by those skilled in the art that improvement that the embodiment of the invention is done for existing leaky coaxial cable is equally applicable to other and sews transmission line, such as leaky waveguide etc.
The improved leaky coaxial cable of employing that Fig. 4 shows the embodiment of the invention carries out the basic structure of the 2X2 MIMO communication system of MIMO communication.As shown in Figure 4, this MIMO communication system comprises AP and STA, and wherein, AP has two less radio-frequencies (RF) port, this RF port respectively with two improved leaky coaxial cable i
1And i
2Link to each other, STA has configured two antenna j
1And j
2, the leaky coaxial cable i of AP
1And i
2Between distance be d
Cable, the distance between the antenna of STA is d
STA, the distance between the antenna of leaky coaxial cable and STA is L.In the present embodiment, between the leaky coaxial cable apart from d
CableCompare very little with the distance L between the antenna of leaky coaxial cable and STA.In Fig. 4, the section of sewing of leaky coaxial cable shows with the white wire segment table, and the non-section of sewing represents with the black line segment.
The quantity of the improved leaky coaxial cable that adopts in the MIMO communication system is relevant with the RF port number of AP, describe as an example of 2 leaky coaxial cables example in the present embodiment, it will be understood by those skilled in the art that and in the MIMO communication system, can adopt according to the quantity of RF port the leaky coaxial cable more than 2 to carry out MIMO communication.
In the present embodiment, in order to obtain the channel matrix of good attitude, two leaky coaxial cables of AP are arranged as follows: two leaky coaxial cable parallel arranged, and be biasing (offset) or interlock (interleaved) between the section of sewing of different leaky coaxial cables, namely the section of sewing of a leaky coaxial cable spatially is in same position (coincide) with the non-section of sewing of other any leaky coaxial cable, and the non-section of sewing of leaky coaxial cable spatially is in same position with the section of sewing of other any leaky coaxial cable.The length of sewing the Duan Yufei section of sewing of every leaky coaxial cable shown in Figure 4 is identical, and the length of the section of sewing of different leaky coaxial cables is identical, and the length of the non-section of sewing also is identical.It will be understood by those skilled in the art that alternatively, the length of the section of sewing of leaky coaxial cable and the non-section of sewing can be not identical yet, and the length of the section of sewing of different leaky coaxial cables and/or the non-section of sewing also can be different.Be subjected to the restriction of different condition in concrete the application, different leaky coaxial cables its section of sewing and/or the non-section of sewing when arranging also allow overlapping, need only the section of sewing that as far as possible guarantees different leaky coaxial cables/non-section of sewing and spatially are in diverse location.About this point, will be described in more detail below.
Can find out from MIMO communication system shown in Figure 4, because the leaky coaxial cable i of AP
1The difference section of sewing to the antenna j of STA
1Distance different, so from leaky coaxial cable i
1Send to antenna j
1Signal be from i
1The stack of the signal that sends of a plurality of sections of sewing.In like manner, from leaky coaxial cable i
2Send to antenna j
1Signal also be from i
2The stack of the signal that sends of a plurality of sections of sewing.Because leaky coaxial cable i
1The Duan Yufei section of sewing of sewing replace leaky coaxial cable i
2The section of sewing and the non-section of sewing also replace and leaky coaxial cable i
1The section of sewing and leaky coaxial cable i
2The non-section of sewing spatially be in same position, so leaky coaxial cable i
1With antenna j
1Between channel and the leaky coaxial cable i of generation
2With antenna j
1Between the channel of generation will be fully different.As long as the spacing d between the distance L between the antenna of the leaky coaxial cable of AP and STA, the antenna of STA
STA, the section of sewing of leaky coaxial cable and the non-section of sewing length on the same order of magnitude, transmission coefficient in the channel matrix between AP and the STA will be different from the coefficient of the channel matrix shown in Fig. 2 and Fig. 3 fully, and namely the amplitude of the element in the channel matrix and phase place are different from amplitude and the phase place of the element in Fig. 2 and the channel matrix shown in Figure 3 fully.That is to say, from leaky coaxial cable i
1The signal that sends (particularly phase place) on amplitude and phase place is different from fully from from leaky coaxial cable i
2The amplitude of the signal that sends and phase place; Otherwise the signal that sends to leaky coaxial cable from antenna also is like this.Therefore, the channel matrix between AP and the STA has inverse matrix, by this inverse matrix, can rebuild the signal that sends at receiving terminal.
Can find out from this embodiment, if place two existing leaky coaxial cables nearer, then be equivalent to place two antennas nearer, and adopt improved leaky coaxial cable, owing to sewing the Duan Yufei section of sewing alternately, then be equivalent to increase the distance between the section of sewing, thereby can obtain existing leaky coaxial cable is placed to get the distant effect that can reach.So, in embodiments of the present invention, though between the leaky coaxial cable apart from d
CableVery little, as long as the spacing d between the antenna of the distance L between the antenna of the leaky coaxial cable of AP and STA, STA
STA, the section of sewing of leaky coaxial cable and the non-section of sewing length on the same order of magnitude, just can rebuild the signal that sends at receiving terminal.
But, if L is much larger than d
STA, then the channel matrix between AP and the STA will be unfavorable for the MIMO communication of high data rate.And in most practical application, the distance that the antenna spacing of STA is suitable is with the suitable distance in interval between the antenna of the leaky coaxial cable of AP and STA, so that L, d
STA, the section of sewing of leaky coaxial cable and the length of the non-section of sewing is not inaccessible condition at an order of magnitude roughly.
Fig. 5 shows the arrangement mode of many improved leaky coaxial cables of the embodiment of the invention.For the ease of understanding, the arrangement mode of 2 or 3 leaky coaxial cables has only been described in the example of Fig. 5, the arrangement mode that it will be understood by those skilled in the art that the leaky coaxial cable more than 3 is identical with the principle of arrangement mode shown in Figure 5.
Shown in the example (1) of Fig. 5, article two, leaky coaxial cable parallel arranged, article one, the section of sewing of leaky coaxial cable spatially is in same position with the non-section of sewing of other any leaky coaxial cable, and has overlapping between the section of sewing of two leaky coaxial cables.In example (1), the length of the section of sewing of every leaky coaxial cable is identical, the length of the non-section of sewing is also identical, but sews the length different (in this example (1), the length of the section of sewing is greater than the length of the non-section of sewing) of the Duan Yufei section of sewing; And one the length of the section of sewing of leaky coaxial cable is identical with the length of the section of sewing of another leaky coaxial cable, and the length of the non-section of sewing of a leaky coaxial cable is also identical with the length of the non-section of sewing of another leaky coaxial cable.Like this, will exist between the section of sewing of two leaky coaxial cables overlapping.Shown in example (1), the equal in length of the superimposed part of the section of sewing.
Shown in the example (2) of Fig. 5, article two, leaky coaxial cable parallel arranged, article one, the section of sewing of leaky coaxial cable spatially is in same position with the non-section of sewing of other any leaky coaxial cable, and has overlapping between the non-section of sewing of two leaky coaxial cables.In example (2), the length of the section of sewing of every leaky coaxial cable is identical, the length of the non-section of sewing is also identical, but sews the length different (in this example (2), the length of the non-section of sewing is greater than the length of the section of sewing) of the Duan Yufei section of sewing; And one the length of the section of sewing of leaky coaxial cable is identical with the length of the section of sewing of another leaky coaxial cable, and the length of the non-section of sewing of a leaky coaxial cable is also identical with the length of the non-section of sewing of another leaky coaxial cable.Like this, will exist between the non-section of sewing of two leaky coaxial cables overlapping.Shown in example (2), the length of the superimposed part of the non-section of sewing is unequal.
Shown in the example (3) of Fig. 5, article three, leaky coaxial cable parallel arranged, article one, the non-section of sewing of the section of sewing of leaky coaxial cable and other any leaky coaxial cable spatially is in same position, and between the section of sewing of 3 leaky coaxial cables and have overlapping between the non-section of sewing.In example (3), the length of the section of sewing of every leaky coaxial cable is identical, the length of the non-section of sewing is also identical, but the length of sewing the Duan Yufei section of sewing is different (in this example (3), the length of the section of sewing is greater than the length of the non-section of sewing, it will be understood by those skilled in the art that in this example, also can be that the length of the non-section of sewing is greater than the length of the section of sewing); And one the length of the section of sewing of leaky coaxial cable is identical with the length of the section of sewing of other leaky coaxial cable, and the length of the non-section of sewing of a leaky coaxial cable is also identical with the length of the non-section of sewing of other leaky coaxial cable.
Shown in the example (4) of Fig. 5, article two, leaky coaxial cable parallel arranged, article one, the non-section of sewing of the section of sewing of leaky coaxial cable and other any leaky coaxial cable spatially is in same position, and between the section of sewing of two leaky coaxial cables and have overlapping between the non-section of sewing.In example (4), the length of the section of sewing of every leaky coaxial cable is different, the length of the non-section of sewing is also different, and one the length of the section of sewing of leaky coaxial cable is different from the length of the section of sewing of another leaky coaxial cable, and the length of the non-section of sewing of a leaky coaxial cable is also different from the length of the non-section of sewing of another leaky coaxial cable.
According to above-described embodiment, in another embodiment of the present invention, article one, the length of the section of sewing of leaky coaxial cable and the non-section of sewing also can be a constant, namely the length of the section of sewing and the non-section of sewing is identical, and the length of all leaky coaxial cable sections of sewing is identical, the length of the non-section of sewing is also identical, and between the section of sewing of these leaky coaxial cables or do not have overlappingly between the non-section of sewing, this embodiment is a special case in the embodiment of the invention.
It will be understood by those skilled in the art that the described MIMO communication system of the present embodiment also can adopt other improved transmission line of sewing, such as improved leaky waveguide etc.
The embodiment of the invention provides improved sew transmission line can with existing wlan device collaborative work, and can produce at lower cost.
Can find out by the embodiment of the invention, in mimo system, adopt the improved transmission line of sewing, place closelyer even these sew transmission line, also can realize the MIMO communication of high data rate, therefore be specially adapted to the scene of limited space.
The above is preferred embodiment of the present invention only, is not for limiting protection scope of the present invention.All any modifications of doing within the spirit and principles in the present invention, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. sew transmission line for one kind, it is characterized in that, comprise the section of sewing and the non-section of sewing, and sew the Duan Yufei section of sewing alternately.
2. the transmission line of sewing according to claim 1 is characterized in that, the length of the described section of sewing and the non-section of sewing is in the same order of magnitude.
3. the transmission line of sewing according to claim 1 is characterized in that, the described non-section of sewing obtains according to following mode:
With the cancellation of the slit on the external conductor of the existing line segment corresponding with the described non-section of sewing of sewing transmission line, perhaps
Place conductive sleeve at the existing line segment corresponding with the described non-section of sewing of sewing transmission line, perhaps
With the slit covering metal band on the external conductor of the existing line segment corresponding with the described non-section of sewing of sewing transmission line.
4. the transmission line of sewing according to claim 1, it is characterized in that, when described transmission line and other of sewing sewed transmission line when jointly using, this sews transmission line and other transmission line is arranged in parallel, and this section of sewing of sewing transmission line spatially is in same position with other any one non-section of sewing of sewing transmission line, and this non-section of sewing of sewing transmission line spatially is in same position with other any one section of sewing of sewing transmission line.
5. each described transmission line of sewing is characterized in that according to claim 1-4, and the described transmission line of sewing is leaky coaxial cable or leaky waveguide.
6. one kind based on the MIMO communication system of sewing transmission line, comprises access point and client, wherein access point with sew transmission line more than two and link to each other, it is characterized in that, sew transmission line for every and comprise the section of sewing and the non-section of sewing, and sew the Duan Yufei section of sewing and replace.
7. MIMO communication system according to claim 6, it is characterized in that, the described transmission line parallel arranged of sewing more than two, and the section of sewing of one sewing transmission line spatially is in same position with other any one non-section of sewing of sewing transmission line, and this non-section of sewing of sewing transmission line spatially is in same position with other any one section of sewing of sewing transmission line.
8. MIMO communication system according to claim 6 is characterized in that, the described length of sewing the section of sewing of transmission line more than two is identical or different, and the described length of sewing the non-section of sewing of transmission line more than two is identical or different.
9. MIMO communication system according to claim 6, it is characterized in that, have overlapping between the described section of sewing of sewing transmission line more than two, perhaps have overlapping between the described non-section of sewing of sewing transmission line more than two, perhaps between the described section of sewing of sewing transmission line more than two and all have between the non-section of sewing overlapping, perhaps equal zero lap between the described section of sewing of sewing transmission line more than two and between the non-section of sewing.
10. MIMO communication system according to claim 6, it is characterized in that, described client links to each other with two above antennas, and the described length of distance between transmission line and the described antenna, the spacing between the described antenna, the described section of sewing of sewing transmission line and the non-section of sewing of sewing is on the same order of magnitude.
11. each described MIMO communication system is characterized in that according to claim 6-10, the described transmission line of sewing is leaky coaxial cable or leaky waveguide.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100745744A CN103326126A (en) | 2012-03-20 | 2012-03-20 | Leaking transmission wire and MIMO communication system based on same |
| PCT/EP2013/055828 WO2013139859A1 (en) | 2012-03-20 | 2013-03-20 | Leaky transmission line and mimo communication system based on leaky transmission line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100745744A CN103326126A (en) | 2012-03-20 | 2012-03-20 | Leaking transmission wire and MIMO communication system based on same |
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| CN103326126A true CN103326126A (en) | 2013-09-25 |
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| CN2012100745744A Pending CN103326126A (en) | 2012-03-20 | 2012-03-20 | Leaking transmission wire and MIMO communication system based on same |
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| Country | Link |
|---|---|
| CN (1) | CN103326126A (en) |
| WO (1) | WO2013139859A1 (en) |
Cited By (3)
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| CN108713276A (en) * | 2016-03-01 | 2018-10-26 | 集美塔公司 | Broadband RF radial waveguide feed part with integrated glass transition part |
| CN111279337A (en) * | 2017-09-06 | 2020-06-12 | 凝聚技术公司 | Lattice reduction in orthogonal time-frequency space modulation |
| CN111403099A (en) * | 2020-03-23 | 2020-07-10 | 杭州富通电线电缆有限公司 | Leakage coaxial cable |
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| JP6200928B2 (en) * | 2015-10-28 | 2017-09-20 | 株式会社フジクラ | Cable type antenna, extension cable type antenna, composite cable type antenna and wireless communication device |
| KR102505590B1 (en) * | 2016-09-30 | 2023-03-03 | 엘에스전선 주식회사 | Hybrid combiner and wireless communication system using the same |
| CN106340703B (en) * | 2016-11-16 | 2022-01-25 | 江苏亨鑫科技有限公司 | High-isolation three-coaxial leaky coaxial cable |
| CN114142198B (en) * | 2021-12-16 | 2022-09-06 | 西安梅隆控制工程有限责任公司 | Single leakage cable with multipath effect and construction method |
| CN116660826B (en) * | 2023-05-17 | 2023-12-19 | 中天射频电缆有限公司 | Leakage device, positioning method and electronic equipment |
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| US5809429A (en) * | 1995-09-22 | 1998-09-15 | Andrew Corporation | Radiating coaxial cable and radio communication system using same |
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| WO2011099901A1 (en) * | 2010-02-09 | 2011-08-18 | Telefonaktiebolaget L M Ericsson (Publ) | An antenna arrangement |
| US20110234338A1 (en) * | 2010-03-23 | 2011-09-29 | Sony Corporation | Bundled leaky transmission line, communication device, and communication system |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108713276A (en) * | 2016-03-01 | 2018-10-26 | 集美塔公司 | Broadband RF radial waveguide feed part with integrated glass transition part |
| CN111279337A (en) * | 2017-09-06 | 2020-06-12 | 凝聚技术公司 | Lattice reduction in orthogonal time-frequency space modulation |
| CN111279337B (en) * | 2017-09-06 | 2023-09-26 | 凝聚技术公司 | Wireless communication method implemented by wireless communication receiver device |
| CN111403099A (en) * | 2020-03-23 | 2020-07-10 | 杭州富通电线电缆有限公司 | Leakage coaxial cable |
| CN111403099B (en) * | 2020-03-23 | 2021-11-09 | 杭州富通电线电缆有限公司 | Leakage coaxial cable |
Also Published As
| Publication number | Publication date |
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| WO2013139859A1 (en) | 2013-09-26 |
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