CN110417427A - Weakened phase restoring circuit and method - Google Patents
Weakened phase restoring circuit and method Download PDFInfo
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- CN110417427A CN110417427A CN201810391761.2A CN201810391761A CN110417427A CN 110417427 A CN110417427 A CN 110417427A CN 201810391761 A CN201810391761 A CN 201810391761A CN 110417427 A CN110417427 A CN 110417427A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/12—Neutralising, balancing, or compensation arrangements
- H04B1/123—Neutralising, balancing, or compensation arrangements using adaptive balancing or compensation means
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Abstract
A kind of weakened phase restoring circuit includes a blind phase detector, is used to detect a final data phase according to multiple first data-signals；One non-blind phase detector is used to detect a header phase according to multiple second header signal；One first phase compensator, for generating data-signal after multiple first compensation；One buffer, for storing data-signal after multiple first compensation；One phase calculation unit is used to calculate multiple second compensation phases according to the final data phase and the header phase；And a second phase compensator, it is used to carry out phase compensation to data-signal after multiple first compensation according to multiple second compensation phase.
Description
Technical field
The present invention refers to a kind of weakened phase restoring circuit and method, and espespecially one kind can carry out weakened phase restoring for cochannel interference
Weakened phase restoring circuit and method.
Background technique
In digital communication systems, weakened phase restoring (Phase Recovery) device of receiving end can first to receive signal into
Row phase error estimates (Phase Error Detection, PED), further according to the phase error estimated to reception signal
Carry out phase compensation and output phase return signal, with reduce receiving end symbol error rate (Symbol Error Rate,
SER) or bit error rate (Bit Error Rate, BER), Lai Gaishan system effectiveness.
In general, it by cochannel interference (Co-Channel Interference, CCI) or is not received in receiver
In the case that device undergoes additive white Gaussian noise (Additive white Gaussian noise, AWGN) channel, according to not
The data phase and the header phase detected according to known header signal that primary data signal is detected, the tracking circuit of rear end can
This phase error is replied using adaptive filter.However, in fact, interfering or undergoing time-varying letter by cochannel in receiver
In the case where road (Time Varying Channel), the data phase detected according to unknown data signal with according to known mark
The header phase error that head signal is detected is larger, so that the tracking circuit of rear end can not reply phase error, leads to receiver
Error rate increases and reduces the receiving efficiency of receiver.
Therefore, the prior art has improved necessity in fact.
Summary of the invention
Therefore, the main object of the present invention is to be to provide a kind of phase that can carry out weakened phase restoring for cochannel interference
Reflex circuit and method, the shortcomings that improve known techniques.
The invention discloses a kind of weakened phase restoring circuits, including end point, receive a first frame and one second frame, this second
Frame connects and adjacent to the first frame, which includes multiple first header signals and multiple first data-signals, this
Two frames include multiple second header signals and multiple second data-signals；One blind phase detector is used to according to multiple
First data-signal, detecting correspond to multiple first data phases of multiple first data-signal；One non-blind detecting phase
Device is used to according to multiple second header signals, and detecting corresponds to a header phase of multiple second header signal；One first phase
Position compensator, is coupled to the blind phase detector, is used to believe multiple first data according to multiple first data phase
Number carry out phase compensation, generate it is multiple first compensation after data-signal；One buffer is coupled to the first phase compensator, uses
To store data-signal after multiple first compensation；One phase calculation unit, is coupled to the blind phase detector and this is non-blind
Formula phase detector, for calculating according to the final data phase and the header phase in multiple first data phase
Multiple second compensation phases；And a second phase compensator, it is coupled to the buffer and the phase calculation unit, is used to basis
Multiple second compensation phase carries out phase compensation to data-signal after multiple first compensation, generates multiple output signals.
The present invention separately discloses a kind of weakened phase restoring method, including receives a first frame and one second frame, wherein this second
For frame in connecting on the time and adjacent to the first frame, which includes multiple first header signals and multiple first data letter
Number, which includes multiple second header signals and multiple second data-signals；According to multiple first data-signal, detect
Survey multiple first data phases for corresponding to multiple first data-signal；According to multiple second header signals, detecting corresponds to
One header phase of multiple second header signal；Multiple first data-signal is carried out according to multiple first data phase
Phase compensation generates data-signal after multiple first compensation, and data-signal after multiple first compensation is stored in a buffering
In device；According to the final data phase and the header phase in multiple first data phase, multiple second compensations are calculated
Phase；And the data-signal after the buffer reads multiple first compensation, and according to multiple second compensation phase to this
Data-signal carries out phase compensation after multiple first compensation, generates multiple output signals.
Detailed description of the invention
Fig. 1 is the block diagram of one weakened phase restoring circuit of the embodiment of the present invention.
Fig. 2 is the schematic diagram of one first frame of the embodiment of the present invention and one second frame.
Fig. 3 is the block diagram of one phase calculation unit of the embodiment of the present invention.
Fig. 4 is data phase of the embodiment of the present invention and second compensation phase is the schematic diagram of time change.
Fig. 5 is the flow chart of one weakened phase restoring method of the embodiment of the present invention.
Symbol description
10 weakened phase restoring circuits
12 blind phase detectors
14 non-blind phase detectors
16 phase calculation units
50 methods
500~510 steps
BF buffer
CDnData-signal after compensation
D1, D2 data packet
F1, F2 frame
H1, H2 header package
LF filter
N time index
N number
OnOutput signal
PC1, PC2 phase compensator
t0~t4Time
Δ θ phase difference
ΔTTime difference
θ1n、θ1N、θML2、Phase
Specific embodiment
Fig. 1 is the block diagram of weakened phase restoring of embodiment of the present invention circuit 10, and Fig. 2 is frame of embodiment of the present invention F1 and frame F2
Schematic diagram.Receiver in 10 application communication system of weakened phase restoring circuit, to receive multiple frames (Frame), each frame includes
Header package and data packet.For convenience of explanation, with weakened phase restoring circuit 10 in subsequent specification and the scope of the patents
It is illustrated for receiving frame F1 and frame F2.Wherein, frame F2 in connecting on the time and includes header package adjacent to frame F1, frame F1
H1 and data packet D1, frame F2 include header package H2 and data packet D2, and header package H1 includes header signal
(Header Signal)H11~H1M, data packet D1 includes data-signal (Data Signal) D11~D1N, header package H2
Including header signal H21~H2M, data packet D2 includes data-signal D21~D2N.Wherein, data-signal D11(D21) represent number
According to the first stroke data in package D1 (D2), data-signal D1N(D2N) represent finishing touch data in data packet D1 (D2), data
Signal D1n(D2n) it is data-signal D1n+1(D2n+1) in temporal previous data-signal, n represents time index.Similarly, it marks
Head signal H11(H21) represent the first stroke data in header package H1 (H2), header signal H1N(H2N) represent header package H1
(H2) finishing touch data in, header signal H1m(H2m) it is header signal H1m+1(H2m+1) in temporal previous stroke count it is believed that
Number, m also represents time index.
Weakened phase restoring circuit 10 include end point ND, a blind phase detector (Blind Phase Detector) 12,
One non-blind phase detector (Non-Blind Phase Detector) 14, phase compensator PC1, PC2, a buffer BF with
And a phase calculation unit 16, endpoint ND receiving frame F1 and frame F2.Non- blind phase detector 14 can be according to known to receiver
(Known) header signal H11~H1M, in time t1It detects/calculates corresponding to header signal H11~H1M(or header signal
H1M) a header phase thetaML1, and according to known header signal H21~H2M, in time t3It detects/calculates corresponding to header
Signal H21~H2M(or header signal H2M) a header phase thetaML2.In an embodiment, non-blind phase detector 14 can benefit
Detecting phase is carried out according to known signal with most (Maximum Likelihood, ML) algorithm is probably spent, i.e., non-blind phase is detectd
Surveying device 14 is most probably to spend phase detector.On the other hand, blind phase detector 12 can be unknown according to receiver
(Unknown) data-signal D11~D1N, detecting/calculating corresponds respectively to data-signal D11~D1NData phase θ 11~θ
1N, and according to unknown data-signal D21~D2N, detecting/calculating corresponds respectively to data-signal D21~D2NData phase θ
21~θ 2N.In an embodiment, 12 availability data of blind phase detector directly (Data Directly) algorithm is according to unknown
Signal carries out detecting phase, i.e. blind phase detector 12 is data direct-type phase detector.
Phase compensator PC1 is coupled to blind phase detector 12, and phase compensator PC1 can be according to blind phase detector
The 12 calculated data phases of institute, carry out phase compensation to data-signal, specifically, phase compensator PC1 can be according to blind
The calculated data phase θ 1 of phase detector 121~θ 1N, respectively to data-signal D11~D1NPhase compensation is carried out, to generate
Data-signal CD1 after compensation1~CD1N.Similarly, phase compensator PC1 can be according to the calculated data of blind phase detector 12
Phase theta 21~θ 2N, respectively to data-signal D21~D2NPhase compensation is carried out, to generate data-signal CD2 after compensation1~CD2N。
In addition, phase compensator PC1 can be a complex multiplier.Preferably, weakened phase restoring circuit 10 includes loop filter LF, coupling
It is connected to phase detector 12,14 and phase compensator PC1, is used to phase theta 1n、θ2n、θML1、θML2It is filtered.
Buffer BF is coupled to phase compensator PC1, for storing data-signal CD1 after compensation1~CD1N.Wherein, it compensates
Data-signal CD1 afterwards1~CD1N-It can be considered the data after (being carried out by phase compensator PC1) for the first time compensated compensation
Signal.
Phase calculation unit 16 is coupled to blind phase detector 12 and non-blind phase detector 14, phase calculation unit
16 by blind phase detector 12 in time t2It receives and corresponds to data-signal D1 in data packet D1N(last) data phase θ
1N, and by non-blind phase detector 14 in time t3It receives and corresponds to header signal H2 in header package H2MHeader phase
θML2.Wherein, final data phase theta 1NFinishing touch data-signal D1 in representative-corresponding data package D1N-Data phase.Phase
Position computing unit 16 is according to data phase θ 1NAnd header phase thetaML2, calculate data-signal CD1 after corresponding to single compensation1~
CD1NSecond compensation phase
Phase compensator PC2 is coupled to buffer BF and phase calculation unit 16, and phase compensator PC2 can be according to phasometer
Calculate the 16 calculated second compensation phase of institute of unitTo data-signal CD1 after single compensation1~CD1NCarry out phase
Compensation, to generate output signal O1~ON.Wherein, output signal O1~ONIt can be considered by (being carried out by phase compensator PC2)
Data-signal after second of compensated compensation.
Specifically, phase calculation unit 16 can calculate second compensation phaseSo that second compensation phaseBetween with time index n be incremented by and have be incremented by relationship (i.e.And correspond to
Finishing touch data-signal D1N-Second compensation phaseFor data phase θ 1NWith header phase thetaML2Between phase difference
θ, i.e.,Wherein, phase difference θ can be Δ θ=θ 1N-θML2Or Δ θ=θML2-θ1N.Phase calculation unit 16 can be counted
Calculate second compensation phaseBetween with time index n be incremented by and be multinomial be incremented by, exponential type be incremented by, logarithmic
It is incremented by.In addition, phase compensator PC2 can be a complex multiplier.
In an embodiment, phase calculation unit 16 can calculate second compensation phaseBetween have linearly pass
Increasing relationship, in other words, phase calculation unit 16 can calculate second compensation phaseFor Wherein the time refers to
N=1 is marked ..., N.Referring to FIG. 3, Fig. 3 is the block diagram of phase calculation unit of the embodiment of the present invention 16.Phase calculation unit 16
Including a subtracter SB and multiplier MP1, MP2, it is data phase θ 1 that subtracter SB, which is used to calculate phase difference θ,NWith header
Phase thetaML2Between subtract each other result.Multiplier MP1 is coupled to subtracter SB, for the inverse by phase difference θ multiplied by N
(Reciprocal), to generate multiplied result Δ θ/N, wherein N is data-signal D11~D1NA number.Multiplier MP2 coupling
In multiplier MP1, it is used to Δ θ/N multiplied by time index n, to generate the second compensation phase for corresponding to time index nFor
In general, it by cochannel interference (Co-Channel Interference, CCI) or is not received in receiver
In the case that device undergoes additive white Gaussian noise (Additive white Gaussian noise, AWGN) channel, in the time
t2Data phase θ 1NWith in time t3Header phase thetaML2It is not much different, for example, final data phase theta 1NWith header
Phase thetaML2Between gap be usually less than 5 °, and the tracking circuit of rear end can reply this phase error using adaptive filter.
In fact, in the case where receiver interferes by cochannel or undergoes time varying channel (Time Varying Channel), it is blind
Formula phase detector 12 detects according to unknown signaling/calculated data phase θ 11~θ 1NCan with the time increase and gradually
Misalignment, final data phase theta 1NWith header phase thetaML2Between gap may to increase to 20 ° even more so that rear end chases after
Track circuit can not reply phase error, cause receiver error rate to increase and reduce the receiving efficiency of receiver.
In comparison, the present invention utilizes buffer BF, phase calculation unit 16 and phase compensator PC2, after compensation
Data-signal CD11~CD1NQuadratic phase compensation is carried out, to compensate the phase error caused by interfering because of cochannel.It is specific next
It says, since weakened phase restoring circuit 10 is in time t2Not yet obtain header phase thetaML2, considering cochannel interference or time varying channel
In the case of, weakened phase restoring circuit 10 temporarily stores data-signal CD1 after compensation first with buffer BF1~CD1N, in the time
t3Obtain header phase thetaML2Afterwards, then (blind phase detector 12 is calculated) is made up using phase calculation unit 16 finally to count
According to phase theta 1NWith (non-blind phase detector 14 is calculated) header phase thetaML2Between gap.
Referring to FIG. 4, Fig. 4 neutron Fig. 4 a is painted data phase θ 1nT/n (i.e. θ 1 at any timenVs.t/n change curve),
Subgraph 4b is painted data phase θ 1nIn addition second compensation phaseT/n is (i.e. at any timeVariation it is bent
Line.Wherein, time t1Corresponding data phase theta 11Time, time t2Corresponding data phase theta 1NTime, time (t1+ΔT) right
Answer phaseTime, time (t2+ΔT) corresponding phaseTime, wherein ΔTRepresent time t1
(t2) with weakened phase restoring circuit 10 calculate output signal O1(ON) time time difference or ΔTRepresent time t1(t2) and phase
Computing unit 16 calculatesThe time difference of time.By subgraph 4a it is found that in time t2The calculated last number of institute
According to phase theta 1NWith header phase thetaML2Still have a segment difference away from.After quadratic phase compensates, by subgraph 4b it is found that phaseIt can reach header phase thetaML2。
Table I is please referred to, Table I is not carry out quadratic phase compensation (situation A) and utilize buffer BF, phase calculation unit 16
And phase compensator PC2 carries out the experimental result of quadratic phase compensation (situation B), Table I is in different carrier-to-noise ratios (C/N)
In, it using 8PSK modulation, symbol rate is 30Msps (symbol per second), the feelings that carrier wave is 9dB than (C/I) to interference
Under condition, the frame number of errors of continuous transmission 10 seconds.By Table I it is found that situation A (not carrying out quadratic phase compensation) C/N be 11~
15dB time frame number of errors is 536~5449, and situation B (carrying out quadratic phase compensation) is 11~15dB time frame mistake in C/N
Number is 0.Therefore, the present invention can reduce frame error ratio and promote receiver efficiency.
Table I
| Situation A | Situation B | |
| C/N=11dB | 536 | 0 |
| C/N=12dB | 1829 | 0 |
| C/N=13dB | 3509 | 0 |
| C/N=14dB | 4789 | 0 |
| C/N=15dB | 5449 | 0 |
Running about weakened phase restoring circuit 10 can be concluded as a weakened phase restoring method 50, please refer to Fig. 5.Weakened phase restoring
Method 50 can be executed by weakened phase restoring circuit 10 comprising following steps:
Step 500: receiving frame F1 and frame F2, wherein frame F1 includes data-signal D11~D1N, frame F2 includes header signal
H21~H2M。
Step 502: according to data-signal D11~D1N, detecting is corresponding to data-signal D11~D1NData phase θ 11~θ
1N。
Step 504: according to header signal H21~H2M, detecting is corresponding to header signal H21~H2MHeader phase thetaML2。
Step 506: according to data phase θ 11~θ 1NTo data-signal D11~D1NPhase compensation is carried out, after generating compensation
Data-signal CD11~CD1N, and will compensation after data-signal CD11~CD1NIt is stored in buffer BF.
Step 508: according to final data phase theta 1NAnd header phase thetaML2, calculate second compensation phase
Step 510: the data-signal CD1 after buffer BF reads compensation1~CD1N, and according to second compensation phaseTo data-signal CD1 after compensation1~CD1NPhase compensation is carried out, output signal O is generated1~ON。
In conclusion the present invention utilizes buffer, phase calculation unit and phase compensator, two are carried out to data-signal
Secondary phase compensation, to compensate the phase error caused by interfering because of cochannel, cocoa reduces frame error ratio and is promoted and received
Device efficiency.
The foregoing is merely presently preferred embodiments of the present invention, all equivalent changes made according to the claims of the present invention with repair
Decorations, are all covered by the present invention.
Claims (8)
1. a kind of weakened phase restoring circuit, receive a first frame and one second frame, wherein second frame connect and adjacent to this
One frame, the first frame include multiple first header signals and multiple first data-signals, which includes multiple second marks
Head signal and multiple second data-signals, comprising:
One blind phase detector is used to according to multiple first data-signal, and detecting corresponds to multiple first data-signal
Multiple first data phases；
One non-blind phase detector is used to according to multiple second header signal, and detecting corresponds to multiple second header and believes
Number a header phase；
One first phase compensator is coupled to the blind phase detector, is used to more to this according to multiple first data phase
A first data-signal carries out phase compensation, generates data-signal after multiple first compensation；
One buffer is coupled to the first phase compensator, for storing data-signal after multiple first compensation；
One phase calculation unit is coupled to the blind phase detector and the non-blind phase detector, is used to according to multiple
A final data phase and the header phase in first data phase, calculate multiple second compensation phases；And
One second phase compensator is coupled to the buffer and the phase calculation unit, is used to according to multiple second compensation phase
Position carries out phase compensation to data-signal after multiple first compensation, generates multiple output signals.
2. weakened phase restoring circuit as described in claim 1, which is characterized in that the phase calculation unit includes:
One subtracter, one for calculating the header phase and the final data phase subtracts each other result；
One first multiplier, is coupled to the subtracter, for this is subtracted each other result multiplied by one of multiple first data-signal
Several inverse, to generate one first multiplied result；And
One second multiplier is coupled to first multiplier, is used to first multiplied result multiplied by a time index, to generate
Correspond to a second compensation phase of the time index in multiple second compensation phase.
3. weakened phase restoring circuit as described in claim 1, which is characterized in that the phase calculation unit, which calculates, corresponds to the time
A second compensation phase beWhereinRepresent the second compensation phase for corresponding to the time, Δ θ generation
One phase difference of table the header phase and the final data phase, N represent a number of multiple first data-signal.
4. weakened phase restoring circuit as described in claim 1, which is characterized in that the blind phase detector is a data direct-type
Phase detector.
5. weakened phase restoring circuit as described in claim 1, which is characterized in that the non-blind phase detector is a most general degree
Phase detector.
6. weakened phase restoring circuit as described in claim 1, which is characterized in that the first phase compensator and the second phase are mended
Repaying device is complex multiplier.
7. a kind of weakened phase restoring method, comprising:
A first frame and one second frame are received, wherein second frame is in connecting on the time and adjacent to the first frame, this first
Frame includes multiple first header signals and multiple first data-signals, which includes multiple second header signals and more
A second data-signal；
According to multiple first data-signal, detecting corresponds to multiple first data phases of multiple first data-signal；
According to multiple second header signals, detecting corresponds to a header phase of multiple second header signal；
Phase compensation is carried out to multiple first data-signal according to multiple first data phase, after generating multiple first compensation
Data-signal, and data-signal after multiple first compensation is stored in a buffer；
According to the final data phase and the header phase in multiple first data phase, multiple second compensation phases are calculated
Position；And
The data-signal after the buffer reads multiple first compensation, and according to multiple second compensation phase to multiple the
Data-signal carries out phase compensation after one compensation, generates multiple output signals.
8. weakened phase restoring method as claimed in claim 7, which is characterized in that according to the final data phase and the header phase
The method for calculating multiple second compensation phases includes:
It calculates and is corresponding to the second compensation phase of a timeWhereinIt represents and corresponds to being somebody's turn to do for the time
Second compensation phase, Δ θ represent a phase difference of the header phase Yu the final data phase, and N represents multiple first data
One number of signal.
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| CN201810391761.2A CN110417427A (en) | 2018-04-27 | 2018-04-27 | Weakened phase restoring circuit and method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106301666A (en) * | 2015-06-03 | 2017-01-04 | 深圳市中兴微电子技术有限公司 | A kind of phase ambiguity bearing calibration and device |
| US20180294947A1 (en) * | 2017-04-07 | 2018-10-11 | Mstar Semiconductor, Inc. | Phase calibration method and associated phase locked loop circuit |
| CN108880533A (en) * | 2017-05-08 | 2018-11-23 | 晨星半导体股份有限公司 | Phase alignment and relevant phase-locked loop circuit |
-
2018
- 2018-04-27 CN CN201810391761.2A patent/CN110417427A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106301666A (en) * | 2015-06-03 | 2017-01-04 | 深圳市中兴微电子技术有限公司 | A kind of phase ambiguity bearing calibration and device |
| US20180294947A1 (en) * | 2017-04-07 | 2018-10-11 | Mstar Semiconductor, Inc. | Phase calibration method and associated phase locked loop circuit |
| CN108880533A (en) * | 2017-05-08 | 2018-11-23 | 晨星半导体股份有限公司 | Phase alignment and relevant phase-locked loop circuit |
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Effective date of registration: 20191219 Address after: No.1, Duhang 1st Road, Hsinchu City, Hsinchu Science Park, Taiwan, China Applicant after: MediaTek.Inc Address before: 1/2, 4th floor, 26 Taiyuan Street, Zhubei City, Hsinchu County, Taiwan, China Applicant before: MStar Semiconductor Co., Ltd. |
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Application publication date: 20191105 |