CN101552678A - 2.4GHz wireless communication device - Google Patents
2.4GHz wireless communication device Download PDFInfo
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- CN101552678A CN101552678A CNA2008100432048A CN200810043204A CN101552678A CN 101552678 A CN101552678 A CN 101552678A CN A2008100432048 A CNA2008100432048 A CN A2008100432048A CN 200810043204 A CN200810043204 A CN 200810043204A CN 101552678 A CN101552678 A CN 101552678A
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Abstract
The invention discloses a 2.4GHz wireless communication device, in particular a device using 2.4 GHz wireless communication in a complex industrial environment. The 2.4GHz wireless communication device comprises a direct sequence frequency-hopping modem, wherein the modem is connected with at least two power distributors, at least one power distributor is connected with at least one set of directive antenna, and at least one power distributor is connected with at least one set of omni-directional antenna. Due to the technical scheme of the invention, the technology of 2.4GHz wireless communication can be used in a complex environment. The 2.4GHz wireless communication device only needs to be provided with one wireless modem as a base station to avoid blind areas among a plurality of signal-covered areas caused by using a plurality of base stations. The invention also has the advantages of remote signal transmitting distance, wide signal-covered range and good applying effect in a complex environment.
Description
Technical field
The present invention relates to a kind of radio communication device, be specifically related to a kind of device of in the complex industrial environment, using the 2.4GHz radio communication.
Background technology
The wireless industrial technology has the advantage that cable technology can't or be difficult to replacement in a lot of application scenarios, from saving connecting line to improving operation, can effectively improve the efficient of user in fields such as asset management, Device Diagnostic, supervision and controls.But because the particularity of wireless signal, its communication distance and transfer of data are inversely proportional to, and the intensity of wireless signal and coverage rate all be subjected to the influence of field condition and weather, so the effect of employing wireless mechanics of communication is not very desirable in complex environment.
Use near the communication of the frequency range of 2.4GHz to be referred to as the 2.4GHz technology, bluetooth, 802.11 at present commonly used, ISM (industry, science, the medical treatment) common frequency band that 802.11b, 802.11g are operated in 2.4GHz belong to the key areas of 2.4GHz technology.
Use the 2.4GHz wireless data communication in complex environment, its communication distance and transfer of data are inversely proportional to, and the intensity of wireless signal and coverage rate all are subjected to the influence of field condition and weather.Therefore in complex environment, use 2.4GHz wireless data communication mode, need carry out detailed design to selection, signal modulation system and the arrangement of antennas of local area network standard, to satisfy the covering of wireless signal.
Up to now, IEEE has developed and has formulated 4 kinds of IEEE, 802.11 WLAN (wireless local area network) standard: IEEE 802.11, IEEE 802.11b, IEEE 802.11a, IEEE 802.11g.4 kinds of standards of all this have all used the carrier sense multiple access of anti-loss of data feature to connect (CDMA/CD) as the shared agreement in path.
On performance, the bandwidth of IEEE 802.11b is 11Mbps, and actual transfer rate is about 5Mbps, and is fair with common 10Base-T specification cable LAN.As the most universal, most widely used wireless standard at present, the advantage of IEEE 802.11b is self-evident.The maturation of technology, feasible cost based on this standard network product has obtained better controlled, and its wireless coverage is big.Therefore, in the wireless industrial communication, the 802.11b standard that most radio communication product adopts.
Though and IEEE 802.11g possesses the high-speed transfer speed of 54Mbps, and possess more outstanding " penetrating " ability, can adapt to complicated more environment for use.But the signal of IEEE 802.11g is much smaller than the scope that the signal of IEEE 802.11b can cover, and the user may need to acquire the signal that more WAP (wireless access point) could satisfy original usable floor area and cover.
2.4GHz the signal modulation system of wireless telecommunications adopt spread-spectrum (Spread Spectrum) mode.In this manner, the frequency spectrum of data-signal is launched away after being extended to several times even tens times again.This way has no doubt been sacrificed band bandwidth, but has improved the antijamming capability and the fail safe of communication system.
And spread-spectrum is divided into frequency hopping (Frequency-Hopping Spread Spectrum) and direct sequence exhibition frequency (Direct Sequence Spread Spectrum) two kinds.
Frequency hopping (Frequency-Hopping Spread Spectrum; FHSS) under synchronous and situation simultaneously, signal is transmitted with the narrow frequency carrier wave of specific pattern in the reception two ends, and for a unspecific recipient, the runout signal that FHSS produced only is an impulsive noise for it.Therefore adopt the transmitting power of the product of this type of technology to reach 500mW and do not have and to cause frequency to pollute to surrounding environment, but its data transmission rate is lower.
Direct Sequence Spread Spectrum (Direct Sequence Spread Spectrum; DSSS) be with original signal 1 or 0, utilize the base position more than 10 to represent 1 or 0, make original higher-wattage, narrower frequency become low-power frequency with wider frequency.
Adopt the product communication distance of frequency hopping can reach 24 kilometers (visual), but its data transmission rate can only reach 100Kbps.
Adopt the product communication distance of Direct Sequence Spread Spectrum can only reach 8 kilometers, but its data transmission rate can reach 11Mbps.
Summary of the invention
Technical problem to be solved by this invention provides a kind of 2.4GHz wireless communication apparatus, and it can only need to install a radio modem act as the base station, avoids occurring using a plurality of base stations to cause blind area between a plurality of signal coverage areas; It is short to solve existing 2.4GHz wireless network signal transmission range simultaneously, and signal cover is little, the shortcoming of effect difference in complex environment.
In order to solve above technical problem, the invention provides a kind of 2.4GHz wireless communication apparatus, comprise direct sequence exhibition modulator-demodulator frequently, described modulator-demodulator links to each other with at least two power dividers, at least one power divider is connected with at least one cover directional antenna, and at least one power divider is connected with at least one cover omnidirectional antenna in addition.
Beneficial effect of the present invention is, by adopting technical scheme of the present invention, can use the 2.4GHz wireless communication technology in complex environment; Save connecting line, and improve operation, effectively improve the efficient of user in fields such as asset management, Device Diagnostic, supervision and controls; It can only need to install a radio modem act as the base station, avoids occurring using a plurality of base stations to cause blind area between a plurality of signal coverage areas.Have long distance of signal transmission simultaneously, signal cover is wide, the good advantage of effect in complex environment.
Preferably, aforementioned directional antenna can adopt barrier parabolic antenna or rotary extrusion type spinning parabolic antenna.
Preferably, aforementioned omnidirectional antenna is the coaxial type omnidirectional antenna.
Preferably, be connected with lightning arrester between aforementioned modulator-demodulator and the power divider.
Preferably, aforementioned directional antenna is at least two covers, and wherein at least one cover is the barrier parabolic antenna, and at least one cover is the rotary extrusion type spinning parabolic antenna.
Preferably, aforementioned omnidirectional antenna is at least two covers, and two cover omnidirectional antennas lay respectively at the barrier both sides.
Description of drawings
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
Fig. 1 is the schematic diagram of the embodiment of the invention one;
Fig. 2 is the schematic diagram of the embodiment of the invention two;
Fig. 3 is the schematic diagram of the embodiment of the invention three.
Embodiment
Embodiment one:
As shown in Figure 1, this plant area's main body is the track of 1070 meters of total lengths, a lot of vegetation is arranged in the middle of the track, and track some in factory building, a part is outside factory building.Operation transporting equipment in orbit need be status data by radioing to master control, and the control command of long-range reception master control.Adopt wireless telecommunications under this rugged environment, intensity that can weak greatly wireless signal, and the track straight length reaches about 500m has proposed very high requirement to the stability of full plant area wireless signal.
In complex environment as shown in Figure 1, can not simply adopt the mode of omnidirectional antenna or unidirectional antenna.Need directional antenna, omnidirectional antenna to be used in combination.Taking into full account under the prerequisite of environmental quality, base station transmit antennas is being installed in 3 places shown in Figure 1.Wherein the parabolic directional antenna 1 of barrier is installed on the factory building inner orbit limit on the support apart from 3 meters on ground, antenna centerline and parallel track, its main track that is in the factory building that covers that transmits; The parabolic directional antenna 2 of rotary extrusion type spinning aluminium sheet is installed on the roof of factory building, it is transmitted can avoid the influence of the middle vegetation of track when covering the factory building outside track; Coaxial type omnidirectional antenna 3 transmits and mainly covers in the factory building of the right and the rail portion on the right.
Adopt this scheme, can accomplish full track road wireless signal coverage rate 100%, and only need install one and adopt the radio modem of Direct Sequence Spread Spectrum to act as the base station, avoid occurring using a plurality of base stations to cause blind area between a plurality of signal coverage areas.
As shown in Figure 1, direct sequence exhibition modulator-demodulator frequently is connected with lightning arrester, the lightning arrester other end links to each other with two power dividers, one of them power divider is connected with a parabolic directional antenna 2 of cover rotary extrusion type spinning aluminium sheet and a cover coaxial type omnidirectional antenna 3, and the another one power divider is connected with the parabolic omnidirectional antenna 1 of a cover barrier.Modulator-demodulator is installed near the rotary extrusion type spinning aluminium sheet parabolic antenna 2.
Direct sequence exhibition of the present invention is modulator-demodulator frequently, connects many cover omnidirectional antennas and directional antenna by power divider.The number of power divider can be according to the number configuration of antenna.
Receiving terminal antenna received power computing formula is
P
r＝P
t+G
r+G
t-ΔP (1)
Wherein, P
r-antenna received power
P
t-modulator-demodulator transmitting power (300mW) is about 24.8dB
G
r-receiving antenna gain
G
t-transmitter antenna gain (dBi)
Δ P-path loss
What reception antenna on the transporting equipment adopted is the steel wire antenna, and its gain is 7dBi, considers that cable loss is-3dBi, therefore can think receiving antenna gain G
r=7dBi-3dBi=4dBi
The path loss of position 1 is among Fig. 1
ΔP＝32.45+20lg(2400)+20+20lg(0.5)≈114dB
The path loss of position 2 is among Fig. 1
ΔP＝32.45+20lg(2400)+20+20lg(0.03)≈90dB
Each transmitter antenna gain (dBi) G
tCalculating need consider factors such as wire jumper loss, lightning arrester loss, feeder loss, specifically face is listed as follows.
Δ P
γ-lightning arrester inserts loss, 0.5dB
Δ P
1/2The loss of-power divider, 4dB
Δ P
ε 1-7/8 " cable loss, 0.1dB/ rice
Δ P
ε 2-1/2 " cable loss, 0.15dB/ rice
Δ P
1The loss of-wire jumper, 1dB/ rice
Δ P
2The loss of-cable adapter, 0.5dB
Take all factors into consideration top various losses, can obtain the yield value of each transmitting antenna.
(1) rotary extrusion type spinning aluminium sheet parabolic antenna
Rotary extrusion type spinning aluminium sheet parabolic antenna 2 gain is about 24dBi, its with modulator-demodulator be connected employing 15m 1/2 " feeder line, so its gain is
G
t＝24-ΔP
γ-ΔP
1/2-ΔP
ε2×15-ΔP
1-ΔP
2＝24-0.5-4-0.15×15-1-0.5＝15.75dB
(2) barrier parabolic antenna
Barrier parabolic antenna 1 gain is about 23dBi, its with modulator-demodulator be connected employing 55m 7/8 " feeder line, so its gain is
G
t＝23-ΔP
γ-2ΔP
1/2-ΔP
ε1×55-ΔP
1-ΔP
2＝23-0.5-8-0.1×55-1-0.5＝7.5dB
(3) coaxial type omnidirectional antenna
Coaxial type omnidirectional antenna 3 gain is about 13dBi, its with modulator-demodulator be connected employing 50m 7/8 " feeder line, so its gain is
G
t＝13-ΔP
γ-2ΔP
1/2-ΔP
ε1×55-ΔP
1-ΔP
2＝13-0.5-8-0.1×50-1-0.5＝-2dB
Therefore, according to (1) Shi Kede
When list used rotary extrusion type spinning aluminium sheet parabolic antenna 2, the received power of position 1 place's steel wire antenna was in Fig. 1
P
r1＝P
t+G
r+G
t-ΔP＝24.8+4+15.75-114＝-69.45dB (2)
When list used barrier parabolic antenna 1, the received power of position 1 place's steel wire antenna was in Fig. 1
P
r2＝P
t+G
r+G
t-ΔP＝24.8+4+7.5-114＝-77.7dB (3)
When list used coaxial type omnidirectional antenna 3, the received power of position 3 place's steel wire antennas was in Fig. 1
P
r3＝P
t+G
r+G
t-ΔP＝24.8+4-2-90＝-63.2dB (4)
And the receiving sensitivity of modulator-demodulator is minimum be-94dBm, therefore from (2), (3), (4) formula as can be seen, by these 3 antennas, can realize the target of wireless signal coverage rate 100% in the factory building.
Embodiment two:
As shown in Figure 2, its environmental classes is like Fig. 1, but according to actual conditions, the length of left side factory building has 500 meters, therefore can adopt the signal of high directional antenna 1 emission of a cover gain to cover this zone, and the right factory building is a square structure, under the situation of not having too high too greatly object blocks, the center of factory building is installed a cover omnidirectional antenna 3 and is accomplished that gamut covers on the right, and the base station can be installed near the directional antenna 1, reduces loss of signal.
Embodiment three:
Have in the middle of the situation as shown in Figure 3, the right factory building and cut off 4, can influence the covering of wireless signal, 2 cover omnidirectional antennas 3 can be installed, make the signal of two cover omnidirectional antennas, 3 emissions cover zones of different, accomplish that gamut covers.Simultaneously, need according to circumstances, adjust the position of base station installation and the gain of antenna.
In embodiment two and embodiment three, the connected mode between modulator-demodulator, lightning arrester, the power divider, and power divider is all identical with the connected mode and the embodiment one of antenna, does not repeat them here.
Claims (6)
1, a kind of 2.4GHz wireless communication apparatus, it is characterized in that, comprise direct sequence exhibition modulator-demodulator frequently, described modulator-demodulator links to each other with at least two power dividers, at least one power divider is connected with at least one cover directional antenna, and at least one power divider is connected with at least one cover omnidirectional antenna in addition.
2,2.4GHz wireless communication apparatus as claimed in claim 1 is characterized in that, described directional antenna can adopt barrier parabolic antenna or rotary extrusion type spinning parabolic antenna.
3,2.4GHz wireless communication apparatus as claimed in claim 2 is characterized in that, described omnidirectional antenna is the coaxial type omnidirectional antenna.
4,2.4GHz wireless communication apparatus as claimed in claim 3 is characterized in that, is connected with lightning arrester between described modulator-demodulator and the power divider.
5,2.4GHz wireless communication apparatus as claimed in claim 4 is characterized in that, described directional antenna is at least two covers, and wherein at least one cover is the barrier parabolic antenna, and at least one cover is the rotary extrusion type spinning parabolic antenna.
6,2.4GHz wireless communication apparatus as claimed in claim 4 is characterized in that, described omnidirectional antenna is at least two covers, and described omnidirectional antenna lays respectively at the barrier both sides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100432048A CN101552678A (en) | 2008-03-31 | 2008-03-31 | 2.4GHz wireless communication device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100432048A CN101552678A (en) | 2008-03-31 | 2008-03-31 | 2.4GHz wireless communication device |
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| Publication Number | Publication Date |
|---|---|
| CN101552678A true CN101552678A (en) | 2009-10-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008100432048A Pending CN101552678A (en) | 2008-03-31 | 2008-03-31 | 2.4GHz wireless communication device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104349440A (en) * | 2013-08-02 | 2015-02-11 | 上海贝尔股份有限公司 | Distributed antenna system and antenna power distribution method thereof |
| CN107911874A (en) * | 2017-11-03 | 2018-04-13 | 江苏恒达微波技术开发有限公司 | A kind of tower communication base station |
-
2008
- 2008-03-31 CN CNA2008100432048A patent/CN101552678A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104349440A (en) * | 2013-08-02 | 2015-02-11 | 上海贝尔股份有限公司 | Distributed antenna system and antenna power distribution method thereof |
| CN104349440B (en) * | 2013-08-02 | 2018-11-16 | 上海诺基亚贝尔股份有限公司 | Distributing antenna system and its antenna power distribution method |
| CN107911874A (en) * | 2017-11-03 | 2018-04-13 | 江苏恒达微波技术开发有限公司 | A kind of tower communication base station |
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Open date: 20091007 |