CN110445738A - A kind of phase estimation method and device based on scattered pilot auxiliary - Google Patents
A kind of phase estimation method and device based on scattered pilot auxiliary Download PDFInfo
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- CN110445738A CN110445738A CN201910629551.7A CN201910629551A CN110445738A CN 110445738 A CN110445738 A CN 110445738A CN 201910629551 A CN201910629551 A CN 201910629551A CN 110445738 A CN110445738 A CN 110445738A
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- scattered pilot
- phase
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/261—Details of reference signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2657—Carrier synchronisation
Abstract
A kind of phase estimation method based on scattered pilot auxiliary, comprising the following steps: extract scattered pilot from receiving in signal；The scattered pilot is grouped, and chooses the group number of predetermined quantity；Meet interval according between described group of number, scattered pilot sum, the adjacent scattered pilot, calculate every group described in scattered pilot symbol lengths；The middle position of scattered pilot described in calculating every group；The phase of scattered pilot described in calculating every group；Phase-interpolation is carried out between the adjacent two sections polymerization pilot tones, estimates the phase of each symbol.A kind of phase estimation device based on scattered pilot auxiliary, comprising: abstraction module, grouping module, computing module, interpolating module.The characteristics of adequately utilizing scattered pilot establishes equivalent aggregation pilot tone and carries out phase-interpolation, efficiently solves the influence of residual frequency deviation bring, and computation complexity is low, and the frame format demodulation for meeting DVB-RCS2 requires.
Description
Technical field
The present invention relates to Carrier Synchronization more particularly to a kind of phase estimation methods and dress based on scattered pilot auxiliary
It sets.
Background technique
In digital communication systems, demodulation mode determines the performance of digital modulation system.Frequency Synchronization in carrier synchronization
It is an indispensable part in digital communication system, the damage of frequency deviation caused by compensating for signal in transmission process.
Signal, still can remaining certain residual frequency deviation influence Phase synchronization after carrying out Frequency Synchronization.For DVB-RCS2
Burst communication, especially high order modulation mode, due to the limitation of Frequency Synchronization precision, residual frequency deviation make call sign be easy across
Domain is adjudicated, causes to judge by accident.
Summary of the invention
In order to solve the problems, such as that Phase synchronization present in related art, the present invention provide a kind of auxiliary based on scattered pilot
The phase estimation method and device helped, sufficient the characteristics of utilizing scattered pilot, establish equivalent aggregation pilot tone and carry out phase-interpolation,
The influence of residual frequency deviation bring is efficiently solved, and computation complexity is low, the frame format demodulation for meeting DVB-RCS2 requires.
To achieve the goals above, the present invention uses following technology:
This method/device design philosophy is as follows:
Scattered pilot is extracted out one by one from synchronization signal, a string of the composition pilot samples for not changing original signal feature are believed
Number.By finding suitable group number, which is grouped, every group can be equivalent to one-step polymerization pilot tone.So
Phase-interpolation is carried out between two sections of adjacent polymerization pilot tones afterwards, estimates the phase of each symbol.
A kind of phase estimation method based on scattered pilot auxiliary, which comprises the following steps:
Scattered pilot is extracted from receiving in signal；
The scattered pilot is grouped, and chooses the group number of predetermined quantity；
Meet interval according between described group of number, scattered pilot sum, the adjacent scattered pilot, calculates every group
The symbol lengths of the scattered pilot；
The middle position of scattered pilot described in calculating every group；
The phase of scattered pilot described in calculating every group；
Phase-interpolation is carried out between the adjacent two sections polymerization pilot tones, estimates the phase of each symbol.
The preamble length for receiving signal is Lpre, the mark space between the adjacent scattered pilot is ddp, extract
The scattered pilot total number is n, and the scattered pilot symbol is zdp(t), channel condition AWGN.
The symbol lengths of scattered pilot described in calculating every group, using formula: Neq=ddp·deq；
Wherein, To be rounded downwards, leqFor described group of number.
The middle position of scattered pilot described in calculating every group, using formula:For kth group pilot tone
Middle position, then the scattered pilot p of the positionmid(k) position in entire frame is
locs(k)=Lpre+locd(k)·ddp, k=1,2 ..., leq。
The phase of scattered pilot described in calculating every group, using formula:
Wherein, i=1,2 ..., n,c*dp(i) for it is local from
Dissipate pilot tone cdp(i) conjugation.
Phase-interpolation is carried out between the adjacent two sections polymerization pilot tones, estimates the phase of each symbol, particular by
Following methods are realized:
The phase of kth group pilot tone is equal to the scattered pilot p in the middle position of this group of pilot tonemid(k) phase, then have
Wherein, lsFor pmid(k) and pmid(k+1) index of the symbol between,For pmid(k) phase value.
A kind of phase estimation device based on scattered pilot auxiliary characterized by comprising
Abstraction module, for extracting scattered pilot from reception signal；
Grouping module for being grouped to the scattered pilot, and chooses the group number of predetermined quantity；
Computing module, for according to meeting between described group of number, scattered pilot sum, the adjacent scattered pilot
Interval, calculate every group described in scattered pilot symbol lengths；Then the middle position of scattered pilot described in calculating every group；Then it counts
The phase of scattered pilot described in calculating every group；
Interpolating module estimates the phase of each symbol for carrying out phase-interpolation between the adjacent two sections polymerization pilot tones
Position.
The invention has the advantages that:
The characteristics of adequately utilizing scattered pilot establishes equivalent aggregation pilot tone and carries out phase-interpolation, efficiently solve residual
Remaining frequency deviation bring influences, and computation complexity is low, and the frame format demodulation for meeting DVB-RCS2 requires.
Detailed description of the invention
Fig. 1 is DVB-RCS2 scattered pilot frame format figure.
Fig. 2 is the structure chart of equivalent aggregation pilot tone.
Fig. 3 is the flow chart of embodiment of the present invention method.
Fig. 4 is the structure chart of apparatus of the present invention embodiment.
Fig. 5 is the planisphere for carrying out Phase synchronization using the method for the present invention/device and deducting after corresponding white noise.
Specific embodiment
The present invention will extract one by one scattered pilot out from synchronization signal, form a string of pilot tones for not changing original signal feature
Sampled signal.By finding suitable group number, which is grouped, every group can be equivalent to one-step polymerization and lead
Frequently.Then phase-interpolation is carried out between two sections of adjacent polymerization pilot tones, estimates the phase of each symbol.
As shown in Figure 1, being DVB-RCS2 scattered pilot frame format figure.
In embodiment:
If the preamble length for receiving signal is Lpre, the mark space between adjacent scattered pilot is ddp, a total of n
Scattered pilot, channel condition AWGN, cdpIt (t) is local scattered pilot symbol.
It is illustrated in figure 3 the flow chart of embodiment of the present invention method.
The first step extracts n point scattered pilot symbol z outdp(t)。
Scattered pilot is grouped by second step.Choose suitable group number leq, every group of scattered pilot can be equivalent to one section it is poly-
Close pilot tone, such as Fig. 2.
Third step calculates the length of every group of pilot tone.
Wherein,To be rounded downwards.Then it polymerize the symbol lengths of pilot tone
Neq=ddp·deq
4th step calculates separately the middle position of every group of pilot tone.
As shown in Fig. 2, the middle position of kth group pilot tone is
The scattered pilot p of the positionmid(k) position in entire frame is
locs(k)=Lpre+locd(k)·ddp, k=1,2 ..., leq
5th step calculates separately the phase of every group of pilot tone.
Wherein
c* dpIt (i) is local scattered pilot cdp(i) conjugation.
6th step carries out phase-interpolation to adjacent two sections of pilot tones.The phase of kth group pilot tone is equal to the centre of this group of pilot tone
The scattered pilot p of positionmid(k) phase, then have
Wherein, lsFor pmid(k) and pmid(k+1) index of the symbol between,For pmid(k) phase value.
It is illustrated in figure 4 the structure chart of apparatus of the present invention embodiment.
Device includes:
Abstraction module, for extracting scattered pilot from reception signal；
Grouping module for being grouped to the scattered pilot, and chooses the group number of predetermined quantity；
Computing module, for according to meeting between described group of number, scattered pilot sum, the adjacent scattered pilot
Interval, calculate every group described in scattered pilot symbol lengths；Then the middle position of scattered pilot described in calculating every group；Then it counts
The phase of scattered pilot described in calculating every group；
Interpolating module estimates the phase of each symbol for carrying out phase-interpolation between the adjacent two sections polymerization pilot tones
Position.
The method of above-described embodiment and/or device are subjected to Phase synchronization, can get the constellation after deducting corresponding white noise
Figure, as shown in Fig. 5 (a)~Fig. 5 (d).
Wherein, the following 4 kinds of waveforms defined for the physical frame formats of Performance Evaluation for DVB-RCS2 standard:
WaveformID=43 (BPSK@1/2)；
WaveformID=42 (BPSK@1/3)；
WaveformID=14 (QPSK@1/2)；
WaveformID=18 (8PSK@2/3).
It is seen that constellation hangover is smaller, farther out from decision threshold, symbol can be correctly adjudicated.
Claims (7)
1. a kind of phase estimation method based on scattered pilot auxiliary, which comprises the following steps:
Scattered pilot is extracted from receiving in signal；
The scattered pilot is grouped, and chooses the group number of predetermined quantity；
Meet interval according between described group of number, scattered pilot sum, the adjacent scattered pilot, calculates described in every group
The symbol lengths of scattered pilot；
The middle position of scattered pilot described in calculating every group；
The phase of scattered pilot described in calculating every group；
Phase-interpolation is carried out between the adjacent two sections polymerization pilot tones, estimates the phase of each symbol.
2. the phase estimation method according to claim 1 based on scattered pilot auxiliary, which is characterized in that receive signal
Preamble length is Lpre, the mark space between the adjacent scattered pilot is ddp, the scattered pilot total number that extracts
For n, the scattered pilot symbol is zdp(t), channel condition AWGN.
3. the phase estimation method according to claim 2 based on scattered pilot auxiliary, which is characterized in that calculate every group of institute
The symbol lengths for stating scattered pilot, using formula: Neq=ddp·deq；
Wherein,M=0,1 ...,To be rounded downwards, leqFor described group of number.
4. the phase estimation method according to claim 3 based on scattered pilot auxiliary, which is characterized in that
The middle position of scattered pilot described in calculating every group, using formula:For in kth group pilot tone
Between position, then the scattered pilot p of the positionmid(k) position in entire frame is
locs(k)=Lpre+locd(k)·ddp, k=1,2 ..., leq。
5. the phase estimation method according to claim 4 based on scattered pilot auxiliary, which is characterized in that calculate every group of institute
The phase for stating scattered pilot, using formula:
Wherein, i=1,2 ..., n,c* dp(i) it is led to be locally discrete
Frequency cdp(i) conjugation.
6. the phase estimation method according to claim 5 based on scattered pilot auxiliary, which is characterized in that at adjacent two sections
Phase-interpolation is carried out between the polymerization pilot tone, the phase of each symbol is estimated, is realized particular by following methods:
The phase of kth group pilot tone is equal to the scattered pilot p in the middle position of this group of pilot tonemid(k) phase, then have
Wherein, lsFor pmid(k) and pmid(k+1) index of the symbol between,For pmid(k) phase value.
7. a kind of phase estimation device based on scattered pilot auxiliary characterized by comprising
Abstraction module, for extracting scattered pilot from reception signal；
Grouping module for being grouped to the scattered pilot, and chooses the group number of predetermined quantity；
Computing module, for according between meeting between described group of number, scattered pilot sum, the adjacent scattered pilot
Every, calculate every group described in scattered pilot symbol lengths；Then the middle position of scattered pilot described in calculating every group；Then it calculates
The phase of scattered pilot described in every group；
Interpolating module estimates the phase of each symbol for carrying out phase-interpolation between the adjacent two sections polymerization pilot tones.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112152958A (en) * | 2020-11-24 | 2020-12-29 | 北京智芯微电子科技有限公司 | Phase estimation method and device based on sparse scattered pilot frequency in OFDM system |
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| CN103095615A (en) * | 2011-10-31 | 2013-05-08 | 华为技术有限公司 | Method and device for phase noise estimation and compensation |
| CN103905351A (en) * | 2014-04-23 | 2014-07-02 | 湖南国科微电子有限公司 | Method and system for DVB-T2 channel estimation |
| CN104219191A (en) * | 2014-09-18 | 2014-12-17 | 扬智科技股份有限公司 | Orthogonal carrier frequency division multiplexing signal processing method and specific pilot frequency domain signal estimation method |
| US20170272288A1 (en) * | 2016-03-21 | 2017-09-21 | Hoda Shahmohammadian | Accurate Cross-Phase Estimation for Dual Polarized Microwave Transceiver |
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2019
- 2019-07-12 CN CN201910629551.7A patent/CN110445738B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103095615A (en) * | 2011-10-31 | 2013-05-08 | 华为技术有限公司 | Method and device for phase noise estimation and compensation |
| CN103905351A (en) * | 2014-04-23 | 2014-07-02 | 湖南国科微电子有限公司 | Method and system for DVB-T2 channel estimation |
| CN104219191A (en) * | 2014-09-18 | 2014-12-17 | 扬智科技股份有限公司 | Orthogonal carrier frequency division multiplexing signal processing method and specific pilot frequency domain signal estimation method |
| US20170272288A1 (en) * | 2016-03-21 | 2017-09-21 | Hoda Shahmohammadian | Accurate Cross-Phase Estimation for Dual Polarized Microwave Transceiver |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112152958A (en) * | 2020-11-24 | 2020-12-29 | 北京智芯微电子科技有限公司 | Phase estimation method and device based on sparse scattered pilot frequency in OFDM system |
| CN112152958B (en) * | 2020-11-24 | 2021-02-26 | 北京智芯微电子科技有限公司 | Phase estimation method and device based on sparse scattered pilot frequency in OFDM system |
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