CN110311740B - Phase ambiguity detection correction method based on 1bit quantization - Google Patents

Phase ambiguity detection correction method based on 1bit quantization Download PDF

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CN110311740B
CN110311740B CN201910495940.5A CN201910495940A CN110311740B CN 110311740 B CN110311740 B CN 110311740B CN 201910495940 A CN201910495940 A CN 201910495940A CN 110311740 B CN110311740 B CN 110311740B
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徐湛
王子樵
陈晋辉
职如昕
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Beijing Information Science and Technology University
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    • 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
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Abstract

The invention relates to a phase fuzzy detection and correction method based on 1bit quantization, which comprises the following steps: setting a phase detection module and a phase correction module which comprise a signal truncation module, a 1bit quantization module, a 1bit correlation operation module and a hard decision module; the receiver of the radio frequency agility transceiver 0, 1 digitalizes and divides the received TX _0 signal returned by the power divider to obtain an I path digital signal and a Q path digital signal respectively, and selects the I path signal as a digital signal to be detected; the digital signal to be detected enters a signal truncation module to be intercepted, so that a digital signal with the point number length of L points is obtained, the digital signal passes through a 1-bit quantization module and then enters a 1-bit correlation operation module, a judgment value is obtained and input into a hard judgment module, the phase relation of the digital signal to be detected is determined and sent to a phase correction module, and the phase correction module sends a correction enabling signal to a baseband signal generation module to finish phase ambiguity detection correction.

Description

Phase ambiguity detection correction method based on 1bit quantization
Technical Field
The invention relates to the field of wireless communication, in particular to a phase ambiguity detection correction method based on 1bit quantization.
Background
For a large-scale multiple-input multiple-output (MIMO) system, due to the limited antennas of the single-chip radio frequency agile transceiver, multiple transceivers need to be used, and the phase correlation of the multi-channel antenna ports is guaranteed. The high-performance and high-integration radio frequency agility transceiver integrates an analog-digital/digital-analog converter, a receiver and a transmitter both comprise a plurality of independently controlled channels, and the working principle of many zero-intermediate frequency transceivers is to mix baseband signals with local oscillator signals to obtain Radio Frequency (RF) transmitting signals. For a zero intermediate frequency agility transceiver without a synchronous radio frequency local oscillation function, a homologous external input signal needs to be input, then a local oscillation signal is obtained by performing frequency halving operation on the external input signal, and 180-degree phase ambiguity can be generated in the frequency halving process of the external input signal.
Before normal operation, the phase fuzzy states of a plurality of transceivers are detected in a self-sending and self-receiving mode, and radio frequency local oscillation signals are corrected. That is, each receiver of the plurality of radio frequency agile transceivers receives the same path of transmission signal, performs phase ambiguity detection on the received multipath signals, judges the phase relationship among the paths of signals, and further corrects the phase ambiguity signal path. However, the existing detection method has high computational complexity.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a phase ambiguity detection and correction method based on 1-bit quantization, which can detect 180-degree phase ambiguity generated by a plurality of rf agile transceivers due to the frequency-halving operation of an internal frequency divider under the self-transmit and self-receive detection condition, correct the signal path of the phase ambiguity, effectively reduce the complexity, and further achieve multi-channel coherent of the MIMO system.
In order to achieve the purpose, the invention adopts the following technical scheme: a phase ambiguity detection correction method based on 1bit quantization comprises the following steps: 1) a phase detection module and a phase correction module are arranged in a control circuit of the existing radio frequency agility transceiver, wherein the phase detection module comprises a signal truncation module, a 1bit quantization module, a 1bit correlation operation module and a hard decision module; the receiver of the radio frequency agility transceiver 0, 1 digitizes the received TX _0 signal returned by the power divider to respectively obtain two paths of digital signals of an I path and a Q path, and selects the signal of the I path as a digital signal to be detected; 2) two paths of digital signals to be detected enter a signal truncation module, the signal truncation module intercepts the digital signals to be detected at the initial position of the signals, and the digital signals to be detected are intercepted to obtain the number of points with the length of
Figure GDA0002179379530000011
A digital signal of a dot; 3) the two paths of cut digital signals enter a 1-bit quantization module, and the 1-bit quantization module carries out 1-bit quantization on the received digital signals respectively so as to obtain a path of bit stream respectively; 4) the bit stream after 1bit quantization enters a 1bit correlation operation module for correlation operation, the obtained decision value is input into a hard decision module, and the phase relation of a digital signal to be detected is determined; 5) after the phase relation of the digital signal to be detected is determined, the phase detection module sends the detection result to the phase correction module, and the phase correction module generates N-1 correction enabling signals b according to the detection resultjWhere N is the number of radio frequency agile transceivers,n-1, from small to large, bjSequentially corresponding to the radio frequency agility transceivers except the reference radio frequency agility transceiver; 6) the phase correction module sends a correction enable signal b to the existing baseband signal generation modulejAnd finishing the phase ambiguity detection correction.
Further, in the step 2), the number of points is long
Figure GDA0002179379530000021
The calculation method comprises the following steps: according to the known frequency f of the digital signal to be detectednAnd a sampling frequency fsCalculating the number of length points of a period
Figure GDA0002179379530000022
Figure GDA0002179379530000023
Further, in the step 3), 1bit is quantized as: if the digital signal is a positive number, the quantization is 1; if the digital signal is negative or 0, then the quantization is-1.
Further, in the step 4), the correlation operation includes the following steps: 4.1) multiplying the two quantized bit streams to obtain a decision bit stream
Figure GDA0002179379530000024
The multiplication calculation is realized by table lookup, and the data combination of multiplication and all the corresponding possible results are shown in table 1;
table 1 multiplication lookup table
Multiplier combination Multiplication result
(1×1) 1
(1×-1) -1
(-1×1) -1
(-1×-1) 1
4.2) will decide the bit stream
Figure GDA0002179379530000025
Adding and summing to obtain decision value
Figure GDA0002179379530000026
Figure GDA0002179379530000027
4.3) setting the decision threshold value to 0, the decision value
Figure GDA0002179379530000028
If the phase difference is larger than the judgment threshold value, outputting a judgment result that the phase difference delta P of the two received signals is equal to 0, namely the two signals are in phase; if the phase difference is smaller than the decision threshold, outputting the phase difference Δ P ═ pi of the two received signals, namely that the signal path has 180-degree phase ambiguity, namely:
Figure GDA0002179379530000029
further, in the step 6), if there is a phase ambiguity between the jth rf agile transceiver and the reference rf agile transceiver signal path and a correction is required, the correction enable signal b is setj1, no phase ambiguity exists, and correction enable signal b is setjIs 0;when correcting the enable signal bjWhen the signal is 1, I, Q two paths of the baseband signal sent by the corresponding radio frequency agile transceiver are inverted, and when the signal b is corrected, the enable signal b isjAt 0, the I, Q paths of the baseband signal remain unchanged.
Due to the adoption of the technical scheme, the invention has the following advantages: the invention carries out 180-degree phase fuzzy detection after carrying out 1bit quantization on the signal to be calibrated, thereby effectively reducing the complexity.
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FIG. 1 is a flow chart of a calibration method according to the present invention.
Detailed Description
The invention provides a phase ambiguity detection correction method based on 1bit quantization, when a radio frequency agility transceiver uses an external input signal as a local oscillation signal, the external input signal needs to be subjected to frequency division operation by a frequency divider inside a chip to obtain the local oscillation signal. A 180 degree phase ambiguity is created during the division by two of the external input signal. As shown in fig. 1, taking two rf agile transceivers as an example, in calibration, assuming that the rf agile transceiver 0 is used as a calibration reference, the single-pole double-throw switch is placed at position 2, the transmission path TX _0 of the rf agile transceiver 0 is sent back to the receiving path of each rf agile transceiver through the power divider to form self-transmission and self-reception, the method detects 180-degree phase ambiguity of a signal caused by frequency halving and corrects the phase ambiguity signal path, and reduces the detection complexity by quantizing the signal 1 bit. The invention is described in detail below with reference to the figures and examples.
The invention comprises the following steps:
1) a phase detection module and a phase correction module are arranged in a control circuit of the existing radio frequency agility transceiver, wherein the phase detection module comprises a signal truncation module, a 1bit quantization module, a 1bit correlation operation module and a hard decision module. The receivers of the radio frequency agility transceivers 0 and 1 digitize the received TX _0 signal returned by the power divider to respectively obtain two paths of digital signals (an I path and a Q path), and the I path signal is selected as a digital signal to be detected.
2) As shown in FIG. 1Two paths of digital signals to be detected enter a signal truncation module, the signal truncation module intercepts the digital signals to be detected at the initial position of the signals, and the digital signals to be detected are intercepted to obtain the number of points with the length of
Figure GDA0002179379530000031
A digital signal of a dot;
according to the known frequency f of the digital signal to be detectednAnd a sampling frequency fsCalculating the number of length points of a period
Figure GDA0002179379530000032
Figure GDA0002179379530000033
3) The two paths of cut digital signals enter a 1-bit quantization module, and the 1-bit quantization module carries out 1-bit quantization on the received digital signals respectively so as to obtain one path of bit stream respectively: that is, if the digital signal is a positive number, the quantization is 1; if the digital signal is negative or 0, then the quantization is-1.
4) The bit stream after 1bit quantization enters a 1bit correlation operation module for correlation operation, the obtained decision value is input into a hard decision module, and the phase relation of a digital signal to be detected is determined;
the correlation operation and decision comprises the following steps:
4.1) multiplying the two quantized bit streams to obtain a decision bit stream
Figure GDA0002179379530000034
Because the bit stream is 1bit, the multiplication calculation can be realized by looking up the table, and the multiplied data combination and all the corresponding possible results are shown in table 1;
table 1 multiplication lookup table
Multiplier combination Multiplication result
(1×1) 1
(1×-1) -1
(-1×1) -1
(-1×-1) 1
4.2) will decide the bit stream
Figure GDA0002179379530000041
Adding and summing to obtain decision value
Figure GDA0002179379530000042
Namely:
Figure GDA0002179379530000043
4.3) setting the decision threshold to 0. Decision value
Figure GDA0002179379530000044
If the phase difference is larger than the judgment threshold value, outputting a judgment result that the phase difference delta P of the two received signals is equal to 0, namely the two signals are in phase; if the phase difference is smaller than the decision threshold value, the phase difference delta P of the two received signals is output, namely the signal path has 180-degree phase ambiguity. Namely:
Figure GDA0002179379530000045
5) after determining the phase relation of the digital signal to be detected, the phase detection module sends the detection result to the phase correction module, and the phase correction module generates N-1 correction enabling signals according to the detection result
Figure GDA0002179379530000047
Wherein N is the number of radio frequency agile transceivers, from small to large bjSequentially corresponding to the radio frequency agility transceivers except the reference radio frequency agility transceiver;
6) the phase correction module sends a correction enable signal b to the existing baseband signal generation modulejN-1, (j ═ 1, 2, 3.. N-1), phase ambiguity detection correction is completed: if the signal path between the jth RF agile transceiver and the reference RF agile transceiver has phase ambiguity and needs to be corrected, then set b j1, if no phase ambiguity exists, then set bjIs 0; in the embodiment, two rf agile transceivers (N ═ 2) are provided, where rf agile transceiver 0 is the reference rf agile transceiver, and there is only one calibration enable signal b1，b1Corresponding to the radio frequency agile transceiver 1. When b is1When the signal is 1, I, Q of the baseband signal _1 sent by the corresponding radio frequency agile transceiver 1 is inverted, and when b is1At 0, the I, Q paths of the baseband signal _1 remain unchanged, that is:
Figure GDA0002179379530000046
wherein, BB _ Ia、BB_QaRespectively representing the signals of the I path and the Q path before correction, BB _ Ip、BB_QpAnd the corrected I-path and Q-path baseband signals are shown.
In conclusion, the invention can effectively identify 180-degree phase ambiguity caused by frequency halving, and only has 1bit information after quantization, thereby effectively reducing the operation amount and reducing the complexity of a detection module.
The above embodiment is only for describing the operation steps of the phase detection technique with 1bit quantization, wherein the number of detected rf agile transceivers is only for illustration and is not limited to the two rf agile transceivers shown in fig. 1, and the point length of the intercepted signal can be set according to the sampling frequency and the frequency of the signal to be detected, and the hard decision threshold is adapted to the sampling frequency and the frequency of the signal to be detected. The parameters and threshold values of the steps can be changed, and the improvement and equivalent transformation of the individual parameters according to the principle of the invention are not excluded from the protection scope of the invention on the basis of the technical scheme of the invention.

Claims (3)

1. A phase ambiguity detection correction method based on 1bit quantization is characterized by comprising the following steps:
1) a phase detection module and a phase correction module are arranged in a control circuit of the existing radio frequency agility transceiver, wherein the phase detection module comprises a signal truncation module, a 1bit quantization module, a 1bit correlation operation module and a hard decision module; the receiver of the N radio frequency agility transceivers digitizes the received TX signal returned by the power divider to respectively obtain two paths of digital signals of an I path and a Q path, and the I path signal is selected as a digital signal to be detected;
2) the N paths of digital signals to be detected respectively enter a signal truncation module, the signal truncation module begins to intercept and process the digital signals to be detected at the initial position of the signals, and digital signals with the point number length of L points are intercepted and obtained from the digital signals to be detected;
3) the N paths of cut digital signals respectively enter a 1-bit quantization module, and the 1-bit quantization module respectively performs 1-bit quantization on the received digital signals so as to respectively obtain one path of bit stream;
4) the bit stream after 1bit quantization enters a 1bit correlation operation module respectively to carry out correlation operation, the obtained decision value is input into a hard decision module, and the phase relation of the digital signal to be detected is determined;
5) after the phase relation of the digital signal to be detected is determined, the phase detection module sends the detection result to the phase correction module, and the phase correction module generates N-1 correction enabling signals b according to the detection resultjWhere N is the number of radio frequency agile transceivers, j is 1, 2, 3One radio frequency agile transceiver in the transceivers is used as a reference radio frequency agile transceiver from small to big bjSequentially corresponding to the radio frequency agility transceivers except the reference radio frequency agility transceiver;
6) the phase correction module sends a correction enable signal b to the existing baseband signal generation modulejCompleting the phase fuzzy detection and correction;
in the step 4), the correlation operation includes the following steps:
4.1) multiplying the two quantized bit streams to obtain a decision bit stream
Figure FDA0003170999630000011
The multiplication calculation is realized by table lookup, and the data combination of multiplication and all the corresponding possible results are shown in table 1;
table 1 multiplication lookup table
Multiplier combination Multiplication result (1×1) 1 (1×-1) -1 (-1×1) -1 (-1×-1) 1
4.2) mixingDecision bit stream
Figure FDA0003170999630000012
Adding and summing to obtain a decision value S:
Figure FDA0003170999630000021
4.3) setting a decision threshold value to be 0, and if the decision value S is greater than the decision threshold value, outputting a decision result that the phase difference delta P of the two received signals is equal to 0, namely the two signals are in phase; if the phase difference is smaller than the decision threshold, outputting the phase difference Δ P ═ pi of the two received signals, namely that the signal path has 180-degree phase ambiguity, namely:
Figure FDA0003170999630000022
in the step 6), if there is a phase ambiguity between the jth RF agile transceiver and the reference RF agile transceiver signal path and correction is required, setting the correction enable signal bj1, no phase ambiguity exists, and correction enable signal b is setjIs 0; when correcting the enable signal bjWhen the signal is 1, I, Q two paths of the baseband signal sent by the corresponding radio frequency agile transceiver are inverted, and when the signal b is corrected, the enable signal b isjAt 0, the I, Q paths of the baseband signal remain unchanged.
2. The method of claim 1, wherein: in the step 2), the number of points is long
Figure FDA0003170999630000023
The calculation method comprises the following steps:
according to the known frequency f of the digital signal to be detectednAnd a sampling frequency fsCalculating the number of length points of a period
Figure FDA0003170999630000024
Figure FDA0003170999630000025
3. The method of claim 1, wherein: in the step 3), 1bit is quantized as follows: if the digital signal is a positive number, the quantization is 1; if the digital signal is negative or 0, then the quantization is-1.
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CN101222259A (en) * 2007-01-09 2008-07-16 中兴通讯股份有限公司 Codebook type precoding method used for four-transmitting antenna MIMO system
CN101854714A (en) * 2010-05-13 2010-10-06 清华大学 Method for achieving wireless communication timing coarse synchronization by using 1bit quantification and hard decision
CN107682294A (en) * 2017-10-11 2018-02-09 中国电子科技集团公司第五十四研究所 A kind of phase ambiguity bearing calibration of the high speed 16apsk signals based on FPGA
CN109286429A (en) * 2018-08-01 2019-01-29 北京邮电大学 Base station and its multiple-input and multiple-output receiving end based on π phase

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Publication number Priority date Publication date Assignee Title
US10374663B2 (en) * 2016-12-30 2019-08-06 Hughes Network Systems, Llc Digital dithering for reduction of quantization errors and side-lobe levels in phased array antennas

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101222259A (en) * 2007-01-09 2008-07-16 中兴通讯股份有限公司 Codebook type precoding method used for four-transmitting antenna MIMO system
CN101854714A (en) * 2010-05-13 2010-10-06 清华大学 Method for achieving wireless communication timing coarse synchronization by using 1bit quantification and hard decision
CN107682294A (en) * 2017-10-11 2018-02-09 中国电子科技集团公司第五十四研究所 A kind of phase ambiguity bearing calibration of the high speed 16apsk signals based on FPGA
CN109286429A (en) * 2018-08-01 2019-01-29 北京邮电大学 Base station and its multiple-input and multiple-output receiving end based on π phase

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