CN118487681A - DC calibration method for radio frequency transmitting link - Google Patents
DC calibration method for radio frequency transmitting link Download PDFInfo
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- CN118487681A CN118487681A CN202410761436.6A CN202410761436A CN118487681A CN 118487681 A CN118487681 A CN 118487681A CN 202410761436 A CN202410761436 A CN 202410761436A CN 118487681 A CN118487681 A CN 118487681A
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- 238000001914 filtration Methods 0.000 claims description 15
- 238000004422 calculation algorithm Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/11—Monitoring; Testing of transmitters for calibration
- H04B17/14—Monitoring; Testing of transmitters for calibration of the whole transmission and reception path, e.g. self-test loop-back
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03178—Arrangements involving sequence estimation techniques
- H04L25/03248—Arrangements for operating in conjunction with other apparatus
- H04L25/03254—Operation with other circuitry for removing intersymbol interference
- H04L25/03267—Operation with other circuitry for removing intersymbol interference with decision feedback equalisers
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
The invention provides a direct current calibration method of a radio frequency transmitting link, which comprises the following steps: transmitting a single-tone signal by adopting a radio frequency transmitting link, and transmitting the single-tone signal to a radio frequency receiving link through a channel between the transmitting link and a receiving link; transmitting the signal received by the radio frequency receiving link to a decision feedback equalizer; and adjusting the direct current bias word of the transmitting link by using a dichotomy according to the received signal strength indication output by the decision feedback equalizer. The direct current calibration method of the radio frequency transmitting link can rapidly and accurately estimate the direct current component of the transmitting link, thereby accurately eliminating the direct current component and improving the transmitting performance.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a direct current calibration method of a radio frequency transmitting link.
Background
In modern wireless communication, when a user equipment is in a connected state to transmit signals, because of the design of a radio frequency chip, the transmitted signals always have direct current interference, so that the local oscillation interference of signals received by an instrument or a base station is larger. In the prior art, when the automatic test equipment calibrates the radio frequency chip, the direct current interference of one or two devices in the radio frequency chip is calibrated, and when the user equipment transmits signals in a connection state, the calibration result of the automatic test equipment during calibration is taken as compensation to eliminate the direct current interference.
Because the calibration platform of the automatic test equipment is used for detaching and calibrating each device of the radio frequency chip, based on the limitation of the calibration platform of the automatic test equipment, only the direct current interference of one two devices in the radio frequency chip can be obtained when the two devices work independently, and the direct current interference of the whole uplink of the radio frequency chip can not be obtained when the whole uplink of the radio frequency chip works, and the direct current interference estimation is inaccurate. Moreover, because the calibration cost of the automatic test equipment is higher, each frequency point and each bandwidth cannot be calibrated, but the direct current interference of each bandwidth and each frequency point is different when the radio frequency chip transmits signals, so that each frequency point has different bandwidths when the radio frequency chip transmits signals, and the calibration result of the automatic test equipment eliminates a part of direct current interference, but still has the residual of the direct current interference to influence the base station or the instrument to receive.
Disclosure of Invention
The direct current calibration method of the radio frequency transmitting link can rapidly and accurately estimate the direct current component of the transmitting link, thereby accurately eliminating the direct current component and improving the transmitting performance.
The invention provides a direct current calibration method of a radio frequency transmitting link, which comprises the following steps:
Transmitting a single-tone signal by adopting a radio frequency transmitting link, and transmitting the single-tone signal to a radio frequency receiving link through a channel between the transmitting link and a receiving link;
transmitting the signal received by the radio frequency receiving link to a decision feedback equalizer;
And adjusting the direct current bias word of the transmitting link by using a dichotomy according to the received signal strength indication output by the decision feedback equalizer.
Optionally, the adjusting the dc offset word of the transmitting link by using the dichotomy according to the received signal strength indication output by the decision feedback equalizer includes:
judging whether the current received signal strength indication is in a convergence state or not according to a dichotomy algorithm;
when the current received signal strength indication is not in a convergence state, updating the threshold value of the direct current control word according to a dichotomy algorithm, determining a new direct current control word in the updated threshold value, and transmitting a single-tone signal by adopting a radio frequency link again.
Optionally, the adjusting the dc offset word of the transmitting link by using the dichotomy according to the received signal strength indication output by the decision feedback equalizer includes:
when the received signal strength indication is in a convergence state, keeping the current frequency point unchanged, traversing a plurality of bandwidths and adjusting the direct current control word; wherein adjusting the dc control word for each bandwidth comprises:
Transmitting a single-tone signal by adopting a radio frequency transmitting link under the current bandwidth, and transmitting the single-tone signal to a radio frequency receiving link through a channel between the transmitting link and a receiving link;
transmitting the signal received by the radio frequency receiving link to a decision feedback equalizer;
And adjusting the direct current bias word of the transmitting link by using a dichotomy according to the received signal strength indication output by the decision feedback equalizer.
Optionally, the adjusting the dc offset word of the transmitting link by using the dichotomy according to the received signal strength indication output by the decision feedback equalizer includes:
When the received signal strength indication is in a convergence state, keeping the current bandwidth unchanged, traversing a plurality of frequency points to adjust the direct current control word; wherein, the adjusting the direct current control word of each frequency point comprises:
Transmitting a single-tone signal by adopting a radio frequency transmitting link under the current frequency band, and transmitting the single-tone signal to a radio frequency receiving link through a channel between the transmitting link and the receiving link;
transmitting the signal received by the radio frequency receiving link to a decision feedback equalizer;
And adjusting the direct current bias word of the transmitting link by using a dichotomy according to the received signal strength indication output by the decision feedback equalizer.
Optionally, before the transmitting the single-tone signal by using the radio frequency transmitting link and transmitting the single-tone signal to the radio frequency receiving link through a path between the transmitting link and the receiving link, the method further includes:
And adjusting the direct current bias word of the receiving link to enable the direct current bias word of the receiving link to be below-45 dbc.
Optionally, before the transmitting the single-tone signal by using the radio frequency transmitting link and transmitting the single-tone signal to the radio frequency receiving link through a path between the transmitting link and the receiving link, the method further includes:
and adjusting the receiving frequency point of the receiving link to ensure that the difference value between the receiving frequency point of the receiving link and the transmitting frequency point of the transmitting link is larger than zero or smaller than zero.
Optionally, the sending the signal received by the radio frequency receiving link to a decision feedback equalizer includes:
mixing signals received by a radio frequency receiving link to obtain a first mixed signal;
amplifying the first mixed signal through a transimpedance amplifier and a programmable gain amplifier to obtain a first amplified signal;
Filtering the first amplified signal to obtain a first filtered signal;
and carrying out analog-to-digital conversion on the first filtering signal and then sending the first filtering signal to a decision feedback equalizer.
Optionally, the mixing the signal received by the radio frequency receiving link to obtain a first mixed signal includes:
And respectively mixing the upper sideband signal, the lower sideband signal and the intrinsic signal received by the radio frequency receiving link to obtain a first mixing sub-signal, a second mixing sub-signal and a third mixing sub-signal of the first mixing signal.
Optionally, the amplifying the first mixed signal by using a transimpedance amplifier and/or a programmable gain amplifier to obtain a first amplified signal includes:
amplifying the first mixed sub-signal, the second mixed sub-signal and the third mixed sub-signal through a transimpedance amplifier and/or a programmable gain amplifier to obtain a first amplified sub-signal, a second amplified sub-signal and a third amplified sub-signal of the first amplified signal.
Optionally, filtering the first amplified signal to obtain a first filtered signal includes:
And filtering the first amplified sub-signal to filter the second mixed sub-signal to obtain a first filtered sub-signal and a second filtered sub-signal of the first filtered signal, wherein the first filtered sub-signal corresponds to the first mixed sub-signal, and the second filtered sub-signal corresponds to the third mixed sub-signal.
The direct current calibration method of the radio frequency transmitting link can utilize the receiving link to receive the single-tone signal sent by the receiving link, and then rapidly judge the direct current control word of the digital baseband of the transmitting link by utilizing the dichotomy, thereby achieving the purpose of eliminating the direct current component of the transmitting link by utilizing the direct current offset signal generated by the digital baseband signal.
Drawings
FIG. 1 is a flow chart of a DC calibration method for a RF transmit chain according to an embodiment of the present invention;
FIG. 2 is a flow chart of a binary iteration of a DC calibration method for a RF transmit chain according to another embodiment of the present invention;
fig. 3 is a signal processing flow chart of a dc-link calibration method of a radio frequency transmission link according to another embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the invention provides a direct current calibration method of a radio frequency transmitting link, as shown in fig. 1, comprising the following steps:
Transmitting a single-tone signal by adopting a radio frequency transmitting link, and transmitting the single-tone signal to a radio frequency receiving link through a channel between the transmitting link and a receiving link;
in some embodiments, the tone signal does not carry information, which is more beneficial to accurately acquiring and adjusting the direct current interference.
Transmitting the signal received by the radio frequency receiving link to a decision feedback equalizer;
In some embodiments, the decision feedback equalizer is capable of performing a calculation of a signal strength indication for the received signal.
And adjusting the direct current bias word of the transmitting link by using a dichotomy according to the received signal strength indication output by the decision feedback equalizer.
In some embodiments, the received signal strength indicator is an important parameter for effectively measuring the quality of the first channel, and in this embodiment, the direct current control word at the next transmission is adjusted according to the current received signal strength indicator calculated by the single-tone signal transmitted each time until the received signal strength indicator reaches a minimum value.
The direct current calibration method of the radio frequency transmitting link can utilize the receiving link to receive the single-tone signal sent by the receiving link, and then rapidly judge the direct current control word of the digital baseband of the transmitting link by utilizing the dichotomy, thereby achieving the purpose of eliminating the direct current component of the transmitting link by utilizing the direct current offset signal generated by the digital baseband signal.
As an alternative embodiment, as shown in fig. 2, the adjusting the dc offset word of the transmitting link by using the dichotomy according to the received signal strength indication output by the decision feedback equalizer includes:
judging whether the current received signal strength indication is in a convergence state or not according to a dichotomy algorithm;
in some embodiments, the dichotomy has the characteristic of generally having rapid convergence, so in this embodiment, the dichotomy is used to determine the current received signal strength indication so as to quickly find a suitable dc control word.
When the current received signal strength indication is not in a convergence state, updating the threshold value of the direct current control word according to a dichotomy algorithm, determining a new direct current control word in the updated threshold value, and transmitting a single-tone signal by adopting a radio frequency link again.
In some embodiments, the dc control word has an association with the received signal strength indication, and therefore, the extremum of the function is calculated using a dichotomy with the dc control word as an argument and the received signal strength indication as a function, so as to obtain the minimum received signal strength indication. When the received signal strength indication is in an unconverged state, after the direct current control word needs to be adjusted, the transmitting signal path of the radio frequency chip is controlled again to transmit a single-tone signal, the received signal strength indication of the signal output by the mixer is calculated again, and after repeated iterations, the minimum received signal strength indication can be obtained.
As an optional implementation manner, the adjusting the dc offset word of the transmitting link by using the dichotomy according to the received signal strength indication output by the decision feedback equalizer includes:
when the received signal strength indication is in a convergence state, keeping the current frequency point unchanged, traversing a plurality of bandwidths and adjusting the direct current control word; wherein adjusting the dc control word for each bandwidth comprises:
Transmitting a single-tone signal by adopting a radio frequency transmitting link under the current bandwidth, and transmitting the single-tone signal to a radio frequency receiving link through a channel between the transmitting link and a receiving link;
transmitting the signal received by the radio frequency receiving link to a decision feedback equalizer;
And adjusting the direct current bias word of the transmitting link by using a dichotomy according to the received signal strength indication output by the decision feedback equalizer.
In some embodiments, since the dc interference corresponding to different bandwidths is not the same, in this embodiment, when the received signal strength indication of the current frequency point is already in a converged state, the frequency point is maintained, and the multiple bandwidths are subjected to traversal adjustment, that is, the dc control word of each bandwidth is adjusted at the current frequency point.
As an optional implementation manner, the adjusting the dc offset word of the transmitting link by using the dichotomy according to the received signal strength indication output by the decision feedback equalizer includes:
When the received signal strength indication is in a convergence state, keeping the current bandwidth unchanged, traversing a plurality of frequency points to adjust the direct current control word; wherein, the adjusting the direct current control word of each frequency point comprises:
Transmitting a single-tone signal by adopting a radio frequency transmitting link under the current frequency band, and transmitting the single-tone signal to a radio frequency receiving link through a channel between the transmitting link and the receiving link;
transmitting the signal received by the radio frequency receiving link to a decision feedback equalizer;
And adjusting the direct current bias word of the transmitting link by using a dichotomy according to the received signal strength indication output by the decision feedback equalizer.
In some embodiments, since the direct current interference corresponding to different frequency points is not the same, in this embodiment, when the received signal strength indication of the current frequency point is already in a convergence state, the frequency point is maintained, and the multiple frequency points are subjected to traversal adjustment, that is, the direct current control word of each frequency point is adjusted under the current frequency point. In some preferred embodiments, since the influence of the bandwidth variation on the dc component is approximately the same at a plurality of frequency points, after the dc control words of the plurality of frequency points are adjusted, the plurality of bandwidths may not be traversed for each frequency point, but the interference of the different bandwidths that is already obtained may be applied to each frequency point.
As an alternative embodiment, before the transmitting the single tone signal by using the radio frequency transmitting link and transmitting the single tone signal to the radio frequency receiving link through a path between the transmitting link and the receiving link, the method further includes:
And adjusting the direct current bias word of the receiving link to enable the direct current bias word of the receiving link to be below-45 dbc.
In some embodiments, since the receiving link is required to receive the signal during the adjustment of the dc control word of the transmitting link, it is necessary to ensure that no interference exists in the receiving link or that the interference of the receiving link is already adjusted to the minimum, so as to ensure that the dc control word of the transmitting link is accurately adjusted.
As an alternative embodiment, before the transmitting the single tone signal by using the radio frequency transmitting link and transmitting the single tone signal to the radio frequency receiving link through a path between the transmitting link and the receiving link, the method further includes:
and adjusting the receiving frequency point of the receiving link to ensure that the difference value between the receiving frequency point of the receiving link and the transmitting frequency point of the transmitting link is larger than zero or smaller than zero.
In some embodiments, the frequency points of the receiving link and the transmitting link are set to different frequency points, so that the eigen signals of the receiving link and the transmitting link form a frequency representing the direct current component after mixing, and further, the measurement of the direct current component is facilitated.
As an alternative embodiment, as shown in fig. 3, the sending the signal received by the radio frequency receiving link to the decision feedback equalizer includes:
mixing signals received by a radio frequency receiving link to obtain a first mixed signal;
amplifying the first mixed signal through a transimpedance amplifier and a programmable gain amplifier to obtain a first amplified signal;
Filtering the first amplified signal to obtain a first filtered signal;
and carrying out analog-to-digital conversion on the first filtering signal and then sending the first filtering signal to a decision feedback equalizer.
As an optional implementation manner, the mixing the signals received by the radio frequency receiving link to obtain a first mixed signal includes:
And respectively mixing the upper sideband signal, the lower sideband signal and the intrinsic signal received by the radio frequency receiving link to obtain a first mixing sub-signal, a second mixing sub-signal and a third mixing sub-signal of the first mixing signal.
As an optional implementation manner, the amplifying the first mixed signal by using a transimpedance amplifier and/or a programmable gain amplifier to obtain a first amplified signal includes:
amplifying the first mixed sub-signal, the second mixed sub-signal and the third mixed sub-signal through a transimpedance amplifier and/or a programmable gain amplifier to obtain a first amplified sub-signal, a second amplified sub-signal and a third amplified sub-signal of the first amplified signal.
As an optional implementation manner, the filtering the first amplified signal to obtain a first filtered signal includes:
And filtering the first amplified sub-signal to filter the second mixed sub-signal to obtain a first filtered sub-signal and a second filtered sub-signal of the first filtered signal, wherein the first filtered sub-signal corresponds to the first mixed sub-signal, and the second filtered sub-signal corresponds to the third mixed sub-signal.
The direct current calibration method of the radio frequency transmitting link can utilize the receiving link to receive the single-tone signal sent by the receiving link, and then rapidly judge the direct current control word of the digital baseband of the transmitting link by utilizing the dichotomy, thereby achieving the purpose of eliminating the direct current component of the transmitting link by utilizing the direct current offset signal generated by the digital baseband signal.
Those skilled in the art will appreciate that implementing all or part of the above-described method embodiments may be accomplished by way of computer programs, which may be stored on a computer readable storage medium, which when executed may comprise the steps of the method embodiments described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a random-access Memory (Random Access Memory, RAM), or the like.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (10)
1. A method for dc calibration of a radio frequency transmit chain, the method comprising:
Transmitting a single-tone signal by adopting a radio frequency transmitting link, and transmitting the single-tone signal to a radio frequency receiving link through a channel between the transmitting link and a receiving link;
transmitting the signal received by the radio frequency receiving link to a decision feedback equalizer;
And adjusting the direct current bias word of the transmitting link by using a dichotomy according to the received signal strength indication output by the decision feedback equalizer.
2. The method of claim 1 wherein said adjusting the dc offset word of the transmit chain using a dichotomy based on the received signal strength indication output by the decision feedback equalizer comprises:
judging whether the current received signal strength indication is in a convergence state or not according to a dichotomy algorithm;
when the current received signal strength indication is not in a convergence state, updating the threshold value of the direct current control word according to a dichotomy algorithm, determining a new direct current control word in the updated threshold value, and transmitting a single-tone signal by adopting a radio frequency link again.
3. The method of claim 2 wherein said adjusting the dc offset word of the transmit chain using a dichotomy based on the received signal strength indication output by the decision feedback equalizer comprises:
when the received signal strength indication is in a convergence state, keeping the current frequency point unchanged, traversing a plurality of bandwidths and adjusting the direct current control word; wherein adjusting the dc control word for each bandwidth comprises:
Transmitting a single-tone signal by adopting a radio frequency transmitting link under the current bandwidth, and transmitting the single-tone signal to a radio frequency receiving link through a channel between the transmitting link and a receiving link;
transmitting the signal received by the radio frequency receiving link to a decision feedback equalizer;
And adjusting the direct current bias word of the transmitting link by using a dichotomy according to the received signal strength indication output by the decision feedback equalizer.
4. The method of claim 2 wherein said adjusting the dc offset word of the transmit chain using a dichotomy based on the received signal strength indication output by the decision feedback equalizer comprises:
When the received signal strength indication is in a convergence state, keeping the current bandwidth unchanged, traversing a plurality of frequency points to adjust the direct current control word; wherein, the adjusting the direct current control word of each frequency point comprises:
Transmitting a single-tone signal by adopting a radio frequency transmitting link under the current frequency band, and transmitting the single-tone signal to a radio frequency receiving link through a channel between the transmitting link and the receiving link;
transmitting the signal received by the radio frequency receiving link to a decision feedback equalizer;
And adjusting the direct current bias word of the transmitting link by using a dichotomy according to the received signal strength indication output by the decision feedback equalizer.
5. The method of claim 1, wherein prior to said transmitting a tone signal using a radio frequency transmit link and transferring said tone signal to a radio frequency receive link via a path between the transmit link and the receive link, the method further comprises:
And adjusting the direct current bias word of the receiving link to enable the direct current bias word of the receiving link to be below-45 dbc.
6. The method of claim 1, wherein prior to said transmitting a tone signal using a radio frequency transmit link and transferring said tone signal to a radio frequency receive link via a path between the transmit link and the receive link, the method further comprises:
and adjusting the receiving frequency point of the receiving link to ensure that the difference value between the receiving frequency point of the receiving link and the transmitting frequency point of the transmitting link is larger than zero or smaller than zero.
7. The method according to any one of claims 1-6, wherein said transmitting the signal received by the radio frequency receive chain to a decision feedback equalizer comprises:
mixing signals received by a radio frequency receiving link to obtain a first mixed signal;
amplifying the first mixed signal through a transimpedance amplifier and a programmable gain amplifier to obtain a first amplified signal;
Filtering the first amplified signal to obtain a first filtered signal;
and carrying out analog-to-digital conversion on the first filtering signal and then sending the first filtering signal to a decision feedback equalizer.
8. The method of claim 7, wherein mixing the signal received by the radio frequency receive chain to obtain a first mixed signal comprises:
And respectively mixing the upper sideband signal, the lower sideband signal and the intrinsic signal received by the radio frequency receiving link to obtain a first mixing sub-signal, a second mixing sub-signal and a third mixing sub-signal of the first mixing signal.
9. The method of claim 8, wherein amplifying the first mixed signal through a transimpedance amplifier and/or a programmable gain amplifier to obtain a first amplified signal comprises:
amplifying the first mixed sub-signal, the second mixed sub-signal and the third mixed sub-signal through a transimpedance amplifier and/or a programmable gain amplifier to obtain a first amplified sub-signal, a second amplified sub-signal and a third amplified sub-signal of the first amplified signal.
10. The method of claim 9, wherein filtering the first amplified signal to obtain a first filtered signal comprises:
And filtering the first amplified sub-signal to filter the second mixed sub-signal to obtain a first filtered sub-signal and a second filtered sub-signal of the first filtered signal, wherein the first filtered sub-signal corresponds to the first mixed sub-signal, and the second filtered sub-signal corresponds to the third mixed sub-signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410761436.6A CN118487681A (en) | 2024-06-13 | 2024-06-13 | DC calibration method for radio frequency transmitting link |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410761436.6A CN118487681A (en) | 2024-06-13 | 2024-06-13 | DC calibration method for radio frequency transmitting link |
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| CN118487681A true CN118487681A (en) | 2024-08-13 |
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