CN110311740A - A kind of phase ambiguity detection bearing calibration based on 1bit quantization - Google Patents
A kind of phase ambiguity detection bearing calibration based on 1bit quantization Download PDFInfo
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- CN110311740A CN110311740A CN201910495940.5A CN201910495940A CN110311740A CN 110311740 A CN110311740 A CN 110311740A CN 201910495940 A CN201910495940 A CN 201910495940A CN 110311740 A CN110311740 A CN 110311740A
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/21—Monitoring; Testing of receivers for calibration; for correcting measurements
Abstract
The present invention relates to a kind of phase ambiguities based on 1bit quantization to detect bearing calibration, step: setting includes signal cutout module, 1bit quantization modules, the phase detecting module and phase correction module of 1bit related operation module and hard decision module；The receiver of radio frequency agile transceiver 0,1, which will receive digitize by the TX_0 signal that power splitter loopback is returned, respectively obtains the road I and Q railway digital signal, chooses the road I signal as digital signal to be detected；Digital signal entering signal truncation module to be detected carries out intercepting process, obtain the digital signal that points length is L point, enter in 1bit related operation module after 1bit quantization modules, obtain decision value input hard decision module, determine the phase relation of digital signal to be detected, and it is sent to phase correction module, phase correction module sends correction enable signal to baseband signal generation module, completes phase ambiguity detection correction.
Description
Technical field
The present invention relates to a kind of wireless communication fields, detect especially with regard to a kind of phase ambiguity based on 1bit quantization
Bearing calibration.
Background technique
For larger multiple-input and multiple-output (MIMO) system, since the antenna of monolithic radio frequency agile transceiver has
Limit, needs using multiple transceivers, and guarantee the phase correlation of multichannel antenna port.The radio frequency of high-performance, high integration
Agile transceiver is integrated with D and D/A converter, and receiver and transmitter include the channel of multiple independent controls, very much
The working principle of zero intermediate frequency transceiver is to be mixed baseband signal with local oscillation signal to obtain radio frequency (RF) transmitting signal.For not
Have the zero intermediate frequency agile transceiver of synchronous RF local oscillator function, needs to input homologous external input signal, then by external
Portion's input signal carries out divide-by-two operations and obtains local oscillation signal, can generate 180 degree during external input signal two divided-frequency
Phase ambiguity.
Before normal work, the phase ambiguity state of multiple transceivers is detected by way of internal loopback, corrects radio frequency
Local oscillation signal.Even each receiver of multiple radio frequency agile transceivers is received with signal is emitted all the way, to the multichannel received
Signal carries out phase ambiguity detection, judges the phase relation between each road signal, and then the signal path that phase calibration is fuzzy.But
Existing detection method computation complexity is larger.
Summary of the invention
In view of the above-mentioned problems, the object of the present invention is to provide a kind of phase ambiguities based on 1bit quantization to detect correction side
Method, this method can detect multiple radio frequency agile transceivers because of two points of internal frequency divider under the testing conditions of internal loopback
The 180 degree phase ambiguity that frequency operation generates, and the signal path that phase calibration is fuzzy effectively reduce complexity, and then realize
Mimo system multichannel coherent.
To achieve the above object, the present invention takes following technical scheme: a kind of phase ambiguity detection based on 1bit quantization
Bearing calibration comprising following steps: 1) in the control circuit of existing radio frequency agile transceiver be arranged phase detecting module and
Phase correction module wherein includes signal cutout module, 1bit quantization modules, 1bit related operation mould in phase detecting module
Block and hard decision module；The receiver of radio frequency agile transceiver 0,1 will receive the TX_0 signal returned by power splitter loopback
It is digitized, respectively obtains the road I and the road Q two ways of digital signals, choose the road I therein signal as digital signal to be detected；
2) two-way digital signal entering signal truncation module to be detected, as at the beginning of signal cutout module treats detection digital signal in signal
Beginning position starts to carry out intercepting process, and the length that obtains counting is intercepted from digital signal to be detected and isThe digital signal of point；3)
Two ways of digital signals after truncation enters 1bit quantization modules, is carried out respectively by 1bit quantization modules to received digital signal
1bit quantization, and then respectively obtain bit stream all the way；4) bit stream after 1bit quantization enter in 1bit related operation module into
Row related operation obtains decision value input hard decision module, determines the phase relation of digital signal to be detected；5) it determines to be checked
After surveying the phase relation of digital signal, phase detecting module will test result and be sent to phase correction module, be tied according to detection
Fruit, phase correction module generate N-1 correction enable signal bj, wherein N be radio frequency agile number of transceivers, j=1,2,
3...N-1, ascending bjIt is corresponding in turn to the radio frequency agile transceiver in addition to reference radio-frequency agile transceiver；6) phase school
Positive module sends correction enable signal b to existing baseband signal generation modulej, complete phase ambiguity detection correction.
Further, in the step 2), the calculation method for the length L that counts are as follows: according to known digital signal frequency to be detected
Rate fnWith sample frequency fsCalculate the length points of a cycle
Further, in the step 3), 1bit quantization are as follows: if digital signal is positive number, be quantified as 1；If digital
Signal is negative or 0, then is quantified as -1.
Further, in the step 4), related operation is the following steps are included: 4.1) by the two-way bit stream phase after quantization
Multiply and decision bits stream is calculatedRealize that multiplication calculates by tabling look-up, the combination of the data of multiplication and
Corresponding all possible outcomes are as shown in table 1；
1 multiplication look-up table of table
| Multiplier combination | Multiplied result |
| (1×1) | 1 |
| (1×-1) | -1 |
| (-1×1) | -1 |
| (-1×-1) | 1 |
4.2) by decision bits streamIt is added summation and obtains decision value S:
4.3) setting decision threshold is 0, and it is two received that decision value S, which then exports court verdict if more than decision threshold,
Road signal phase difference Δ P=0, the i.e. same phase of two paths of signals；The two paths of signals phase difference received is exported if being less than decision threshold
There are the phase ambiguities of 180 degree by Δ P=π, i.e. signal path, it may be assumed that
Further, in the step 6), if j-th of radio frequency agile transceiver and reference radio-frequency agile transceiver signal are logical
It there are phase ambiguity between road, needs to correct, then sets correction enable signal bjIt is 1, there is no phase ambiguities not to need then, then
Set correction enable signal bjIt is 0；As correction enable signal bjWhen being 1, by base band transmitted by corresponding radio frequency agile transceiver
I, Q two-way of signal negate, as correction enable signal bjWhen being 0, then I, Q two-way of baseband signal remain unchanged.
The invention adopts the above technical scheme, which has the following advantages: the present invention treats calibration signal and carries out
180 degree phase ambiguity detection is carried out again after 1bit quantization, effectively reduces complexity.
Detailed description of the invention
Fig. 1 is bearing calibration flow diagram of the invention.
Specific embodiment
The present invention provides a kind of phase ambiguity detection bearing calibration based on 1bit quantization, when radio frequency agile transceiver makes
When using external input signal as local oscillation signal, external input signal needs to make two divided-frequency behaviour by the frequency divider of chip interior
Obtain local oscillation signal.The phase ambiguity of 180 degree can be generated during external input signal two divided-frequency.As shown in Figure 1,
By taking two radio frequency agile transceivers as an example, timing, it is assumed that using radio frequency agile transceiver 0 as correction reference, by single-pole double throw
Switch is placed in 2 positions, and the transmitting path TX_0 of radio frequency agile transceiver 0 is transmitted back to each radio frequency agile transmitting-receiving by power splitter
The receiving path of device forms internal loopback, and this method is directed to causes the 180 degree phase ambiguity of signal to be detected by two divided-frequency
And the signal path of phase ambiguity is corrected, detection complexity is reduced by quantifying to signal 1bit.With reference to the accompanying drawing
The present invention is described in detail with embodiment.
The present invention the following steps are included:
1) phase detecting module and phase correction module are set in the control circuit of existing radio frequency agile transceiver,
It include signal cutout module, 1bit quantization modules, 1bit related operation module and hard decision module in middle phase detecting module.
The receiver of radio frequency agile transceiver 0,1 will be received and be digitized by the TX_0 signal that power splitter loopback is returned, respectively
Two ways of digital signals (road I, the road Q) is obtained, chooses the road I therein signal as digital signal to be detected.
2) as shown in Figure 1, two-way digital signal entering signal truncation module to be detected, by signal cutout module to be checked
It surveys digital signal to start to carry out intercepting process in signal initial position, interception obtains points length from digital signal to be detected
For the digital signal of L point；
According to known digital signal frequency f to be detectednWith sample frequency fsCalculate the length points of a cycle
3) two ways of digital signals after being truncated enters 1bit quantization modules, respectively by 1bit quantization modules to received number
Word signal carries out 1bit quantization, and then respectively obtains bit stream all the way: i.e. if digital signal is positive number, being quantified as 1；Such as
Fruit digital signal is negative or 0, then is quantified as -1.
4) bit stream after 1bit quantization, which enters, carries out related operation in 1bit related operation module, it is defeated to obtain decision value
Enter hard decision module, determines the phase relation of digital signal to be detected；
Related operation and judgement the following steps are included:
4.1) decision bits stream is calculated in the two-way bit stream multiplication after quantizationDue to
Bit stream is 1bit, can realize that multiplication calculates by tabling look-up, the data combination of multiplication and corresponding all possible outcome such as tables 1
It is shown；
1 multiplication look-up table of table
| Multiplier combination | Multiplied result |
| (1×1) | 1 |
| (1×-1) | -1 |
| (-1×1) | -1 |
| (-1×-1) | 1 |
4.2) by decision bits streamIt is added summation and obtains decision value S, it may be assumed that
4.3) setting decision threshold is 0.It is two received that decision value S, which then exports court verdict if more than decision threshold,
Road signal phase difference Δ P=0, the i.e. same phase of two paths of signals；The two paths of signals phase difference received is exported if being less than decision threshold
There are the phase ambiguities of 180 degree by Δ P=π, i.e. signal path.That is:
5) after the phase relation for determining digital signal to be detected, phase detecting module will test result and be sent to phase school
Positive module, according to testing result, phase correction module generate N-1 correction enable signal bj(j=1,2,3...N-1)；Wherein
N is radio frequency agile number of transceivers, ascending bjThe radio frequency agile in addition to reference radio-frequency agile transceiver is corresponding in turn to receive
Send out device；
6) phase correction module sends correction enable signal b to existing baseband signal generation modulej(j=1,2,3...N-
1), complete phase ambiguity detection correction: if j-th radio frequency agile transceiver and reference radio-frequency agile transceiver signal access it
Between there are phase ambiguity, need to correct, then set bjIt is 1, there is no phase ambiguities not to need then, then sets bjIt is 0；In the present embodiment
There are two radio frequency agile transceivers (N=2) for middle setting, and wherein radio frequency agile transceiver 0 is benchmark radio frequency agile transceiver, then
Only one correction enable signal b1, b1Corresponding radio frequency agile transceiver 1.Work as b1When being 1, by corresponding radio frequency agile transceiver
I, Q two-way of baseband signal _ 1 transmitted by 1 negate, and work as b1When being 0, then I, Q two-way of baseband signal _ 1 remain unchanged, it may be assumed that
Wherein, BB_Ia、BB_QaRespectively indicate the correction preceding road I, Q roadbed band signal, BB_Ip、BB_QpIndicate I after correcting
Road, Q roadbed band signal.
In conclusion the present invention can effectively identify the 180 degree phase ambiguity as caused by two divided-frequency, in addition quantify
There was only 1bit information afterwards, so as to effectively reduce operand, reduces detection module complexity.
Above-mentioned specific implementation example is intended merely to illustrate the operating procedure of the phase detection techniques of 1bit quantization,
In the radio frequency agile transceiver number that is detected solely for the purpose of illustration, be not limited to shown in Fig. 1 two radio frequency agiles and receive
Device is sent out, while the points length of intercept signal can be set according to sample frequency and measured signal frequency, sentenced threshold value firmly and mutually fitted therewith
It answers.Parameter, the threshold value of each step may be changed, based on the technical solution of the present invention, it is all according to the present invention
The improvement and equivalents that principle carries out individual parameters, should not exclude except protection scope of the present invention.
Claims (5)
1. a kind of phase ambiguity based on 1bit quantization detects bearing calibration, which is characterized in that method includes the following steps:
1) phase detecting module and phase correction module are set in the control circuit of existing radio frequency agile transceiver, wherein phase
It include signal cutout module, 1bit quantization modules, 1bit related operation module and hard decision module in detection module；Radio frequency agile
The receiver of transceiver 0,1 will receive by power splitter loopback return TX_0 signal digitizes, respectively obtain the road I and
The road Q two ways of digital signals chooses the road I therein signal as digital signal to be detected；
2) two-way digital signal entering signal truncation module to be detected treats detection digital signal in signal by signal cutout module
Initial position starts to carry out intercepting process, and interception obtains the digital signal that points length is L point from digital signal to be detected；
3) two ways of digital signals after being truncated enters 1bit quantization modules, respectively by 1bit quantization modules to received digital signal
1bit quantization is carried out, and then respectively obtains bit stream all the way；
4) bit stream after 1bit quantization, which enters, carries out related operation in 1bit related operation module, obtain decision value input and sentence firmly
Certainly module determines the phase relation of digital signal to be detected；
5) after the phase relation for determining digital signal to be detected, phase detecting module will test result and be sent to phasing mould
Block, according to testing result, phase correction module generate N-1 correction enable signal bj, wherein N is radio frequency agile transceiver number
Amount, j=1,2,3...N-1, ascending bjIt is corresponding in turn to the radio frequency agile transceiver in addition to reference radio-frequency agile transceiver；
6) phase correction module sends correction enable signal b to existing baseband signal generation modulej, complete phase ambiguity and detect school
Just.
2. method as described in claim 1, it is characterised in that: in the step 2), length of countingLCalculation method are as follows:
According to known digital signal frequency f to be detectednWith sample frequency fsCalculate the length points of a cycle
3. method as described in claim 1, it is characterised in that: in the step 3), 1bit quantization are as follows: if digital signal is positive
Number, then be quantified as 1；If digital signal is negative or 0, it is quantified as -1.
4. method as described in claim 1, it is characterised in that: in the step 4), related operation the following steps are included:
4.1) decision bits stream is calculated in the two-way bit stream multiplication after quantizationBy tabling look-up
Realize that multiplication calculates, the data combination of multiplication and corresponding all possible outcomes are as shown in table 1；
1 multiplication look-up table of table
4.2) by decision bits streamIt is added summation and obtains decision value S:
4.3) setting decision threshold is 0, and it is the two paths of signals received that decision value S, which then exports court verdict if more than decision threshold,
The same phase of phase difference P=0, i.e. two paths of signals；The two paths of signals phase difference P=π received is exported if being less than decision threshold,
I.e. there are the phase ambiguities of 180 degree for signal path, it may be assumed that
5. method as described in claim 1, it is characterised in that: in the step 6), if j-th of radio frequency agile transceiver and benchmark
It there are phase ambiguity between radio frequency agile transceiver signal access, needs to correct, then sets correction enable signal bjIt is 1, is not present
Phase ambiguity does not need then, then sets correction enable signal bjIt is 0；As correction enable signal bjWhen being 1, by corresponding radio frequency agile
I, Q two-way of baseband signal transmitted by transceiver negate, as correction enable signal bjWhen being 0, then I, Q two-way of baseband signal
It remains unchanged.
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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 |
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| 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 |
| US20180191406A1 (en) * | 2016-12-30 | 2018-07-05 | Hughes Network Systems, Llc | Digital dithering for reduction of quantization errors and side-lobe levels in phased array antennas |
| 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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Patent Citations (5)
| 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 |
| US20180191406A1 (en) * | 2016-12-30 | 2018-07-05 | Hughes Network Systems, Llc | Digital dithering for reduction of quantization errors and side-lobe levels in phased array antennas |
| 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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