CN108566348A - A kind of improved multichannel Decision-Feedback Equalization - Google Patents
A kind of improved multichannel Decision-Feedback Equalization Download PDFInfo
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- CN108566348A CN108566348A CN201810013557.7A CN201810013557A CN108566348A CN 108566348 A CN108566348 A CN 108566348A CN 201810013557 A CN201810013557 A CN 201810013557A CN 108566348 A CN108566348 A CN 108566348A
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- multichannel
- decision
- feedback equalizer
- decision feedback
- prefilter
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- 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
Abstract
The present invention is to provide a kind of improved multichannel Decision-Feedback Equalizations.(1) vertical hydrophone array received signal is used, calibrates each array element so that each array element sensitivity is consistent；(2) by the demodulation of signal that each array element receives and it is down-sampled after be converted into baseband signal, obtain the weight coefficient of prefilter using training sequence；(3) baseband signal waits gains summation by being carried out after multichannel prefilter；(4) cascade single channel decision feedback equalizer removes random phase and residual intersymbol interference.The present invention updates prefilter coefficient using training sequence, filter coefficient once it is determined that after will be used to a balanced frame data symbol.The single channel decision feedback equalizer of embedded second order digital phaselocked loop can effectively compensate random phase and further suppress residual intersymbol interference simultaneously.In slowly varying channel, not only realized with traditional comparable portfolio effect of multichannel decision feedback equalizer, but also greatly reduce the complexity of calculating.
Description
Technical field
It is specifically a kind of based on vertical hydrophone array the present invention relates to a kind of Underwater acoustic signal processing method
Signal of communication time domain equalization method.
Background technology
Multichannel decision feedback equalizer is a kind of signal processing method of joint equalization and diversity.Utilize multiple hydrophones
Receive signal under the premise of not increasing transmission power and transmission bandwidth, can effectively improve logical to resist the decline of channel
The performance of letter system.The decision feedback equalizer in each channel can offset Multi-path interference simultaneously, reduce intersymbol interference.
Traditional multichannel decision feedback equalizer is by multichannel forward-direction filter, multichannel second-order PLL and single channel
Feedback filter forms.When the data volume of communication is larger, the calculation amount of band-wise processing is multiplied, and Project Realization is difficult.
Invention content
The purpose of the present invention is to provide a kind of improved multichannel Decision-Feedback Equalizations of low complex degree.
The object of the present invention is achieved like this：
(1) vertical hydrophone array received signal is used, calibrates each array element so that each array element sensitivity is consistent；
(2) by the demodulation of signal that each array element receives and it is down-sampled after be converted into baseband signal, obtained using training sequence
The weight coefficient of prefilter；
(3) baseband signal waits gains summation by being carried out after multichannel prefilter；
(4) cascade single channel decision feedback equalizer removes random phase and residual intersymbol interference.
The features of the present invention includes：
1, multichannel prefilter obtains filter coefficient using training sequence and adaptive algorithm, this group of coefficient by with
In the equilibrium of a frame signal.
2, single channel decision feedback equalizer is cascaded after prefilter, is connect using second order digital phaselocked loop tracking and compensating
Random phase in the collection of letters number；Intersymbol interference is further suppressed using forward-direction filter and feedback filter.
The advantage of the invention is that：
(1) portfolio effect is suitable with traditional multichannel decision feedback equalizer；
(2) complexity calculated is much smaller than traditional multichannel criterion feedback equalizer.
Specifically：
The present invention updates prefilter coefficient using training sequence, with traditional multichannel decision feedback equalizer phase
Than, this group of filter coefficient once it is determined that after will be used to a balanced frame data symbol, it is anti-rather than traditional multichannel judgement
Present the parameter that balanced device needs more new system symbol-by-symbol.The single channel decision feedback equalizer of embedded second order digital phaselocked loop simultaneously
Random phase can effectively be compensated and further suppress residual intersymbol interference.In slowly varying channel, both realized with
Traditional comparable portfolio effect of multichannel decision feedback equalizer, and greatly reduce the complexity of calculating.
Description of the drawings
Fig. 1 is improved multichannel Structure of Decision-feedback Equalization figure；
Fig. 2 is communication data frame structure figure；
Fig. 3 is traditional multichannel Structure of Decision-feedback Equalization figure；
Fig. 4 is the output signal-to-noise ratio of multichannel decision feedback equalizer under different input signal-to-noise ratios；
Fig. 5 is the performance comparison of multichannel decision feedback equalizer under different array numbers；
Fig. 6 is basin test result.
Specific implementation mode
It illustrates below and the present invention is described in more detail.
1, improved multichannel decision feedback equalization specific implementation：
Each array element of receiving array is calibrated first before receiving signal so that each channel sensitivity is consistent, ensures each channel
The consistency of signal, so as to subsequent processing.Below in conjunction with the accompanying drawings 1 and attached drawing 2 to improved multichannel decision feedback equalizer into
Row analytic explanation：
If element number of array is M, channel length 2L；Input signal is ri[n], 1≤i≤M；The tap system of prefilter
Number is wi[l], 1≤i≤M, wherein wi[n]={ wi[0],wi[1],…,wi[L],…wi[2L-1]}；N moment decision-feedbacks are equal
The forward direction and feedback filter coefficient of weighing apparatus are respectively an[l] and bn[l], wherein an[l]={ an[0],an[1],…,an
[l],…an[L-1] }, bn[l]={ bn[0],bn[1],…,bn[l],…bn[L-1]}。
The coefficient of prefilter is updated according to adaptive algorithm using training sequence.Utilize this group of filter coefficient pair
One frame signal carries out balanced and carries out waiting gains summation：
Using training sequence, according to adaptive algorithm, the tap coefficient of update decision feedback filter device is a [n] and b [n],
Phase theta is updated using second order digital phase-lock-loop algorithmn。
The output of decision feedback equalizer is：
2, simulation study：
Simulated conditions：Depth of water 200m, vertical reception battle array are made of 8 array elements, and array element spacing is 10m, top array element distance
Water surface 10m, communication distance 1km.Sample frequency 48kHz, carrier frequency 6kHz, mapping mode BPSK.Data frame packet contains
9000bit data, wherein preceding 500bit is training sequence.
Attached drawing 4 is the performance comparison of multichannel decision feedback equalizer under different input signal-to-noise ratios.As can be seen from Figure,
The performance of multichannel decision feedback equalizer is affected by noise, and with the increase of input signal-to-noise ratio, output signal-to-noise ratio also increases.Together
When improved multichannel decision feedback equalizer it is suitable with traditional performance of multichannel decision feedback equalizer.
Attached drawing 5 is the performance comparison of multichannel decision feedback equalizer under different array numbers.As can be seen from Figure, mostly logical
The performance of road decision feedback equalizer is influenced by array number, and array number is more, and output signal-to-noise ratio is bigger.Improved multichannel simultaneously
Decision feedback equalizer is suitable with traditional performance of multichannel decision feedback equalizer.
3, basin test
In order to verify effectiveness of the invention energy, inventor has carried out confirmatory experiment：The long 45m in pond, wide 6m, depth
For 5m.It is 2.5m that transmitting transducer, which hangs depth,.It is 1-3.5m that hydrophone, which hangs depth, and totally 6 array element, array element spacing are
0.5m, communication distance 19m.Sample frequency 48kHz, carrier frequency 3kHz, mapping mode BPSK.Data frame packet contains 16000bit
Data, wherein preceding 500bit is training sequence.
Attached drawing 6 is the performance comparison of multichannel decision feedback equalizer under different array numbers.As can be seen from Figure, it improves
Multichannel decision feedback equalizer it is suitable with traditional performance of multichannel decision feedback equalizer, demonstrate the present invention have
Effect property.
Claims (3)
1. a kind of improved multichannel Decision-Feedback Equalization, it is characterized in that：
(1) vertical hydrophone array received signal is used, calibrates each array element so that each array element sensitivity is consistent；
(2) by the demodulation of signal that each array element receives and it is down-sampled after be converted into baseband signal, obtained using training sequence preposition
The weight coefficient of filter；
(3) baseband signal waits gains summation by being carried out after multichannel prefilter；
(4) cascade single channel decision feedback equalizer removes random phase and residual intersymbol interference.
2. improved multichannel Decision-Feedback Equalization according to claim 1, it is characterized in that described carry out equal gains
Summation is expressed as：
Wherein：M is element number of array, channel length 2L；ri[n] is input signal, 1≤i≤M；wi[l] is prefilter
Tap coefficient, 1≤i≤M, wi[n]={ wi[0],wi[1],…,wi[L],…wi[2L-1]}；N is the moment.
3. improved multichannel Decision-Feedback Equalization according to claim 1 or 2, it is characterized in that decision feedback equalization
The output of device is：
The forward direction and feedback filter coefficient of n moment decision feedback equalizer are respectively an[l] and bn[l], an[l]={ an[0],
an[1],…,an[l],…an[L-1] }, bn[l]={ bn[0],bn[1],…,bn[l],…bn[L-1]}。
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Cited By (6)
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| CN109405954A (en) * | 2018-10-23 | 2019-03-01 | 哈尔滨工程大学 | A kind of UUV mobile underwater sound communication technology based on vector hydrophone arrays |
| CN111024208A (en) * | 2019-11-26 | 2020-04-17 | 中国船舶重工集团有限公司第七一0研究所 | Vertical array sound pressure gradient beam forming and signal detecting method |
| CN113411278A (en) * | 2021-07-07 | 2021-09-17 | 哈尔滨工程大学 | Equalization processing method of low-frequency underwater acoustic communication based on receiving array |
| CN113613303A (en) * | 2021-08-09 | 2021-11-05 | 电子科技大学 | Millimeter wave communication transmission method based on multichannel technology |
| CN113992486A (en) * | 2021-10-27 | 2022-01-28 | 西安微电子技术研究所 | Self-adaptive dual-standard component extreme value comparison decision feedback equalization circuit |
| CN115987728A (en) * | 2023-03-21 | 2023-04-18 | 荣耀终端有限公司 | Data processing method and electronic equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109405954A (en) * | 2018-10-23 | 2019-03-01 | 哈尔滨工程大学 | A kind of UUV mobile underwater sound communication technology based on vector hydrophone arrays |
| CN109405954B (en) * | 2018-10-23 | 2022-01-14 | 哈尔滨工程大学 | UUV mobile underwater acoustic communication technology based on vector hydrophone array |
| CN111024208A (en) * | 2019-11-26 | 2020-04-17 | 中国船舶重工集团有限公司第七一0研究所 | Vertical array sound pressure gradient beam forming and signal detecting method |
| CN113411278A (en) * | 2021-07-07 | 2021-09-17 | 哈尔滨工程大学 | Equalization processing method of low-frequency underwater acoustic communication based on receiving array |
| CN113613303A (en) * | 2021-08-09 | 2021-11-05 | 电子科技大学 | Millimeter wave communication transmission method based on multichannel technology |
| CN113992486A (en) * | 2021-10-27 | 2022-01-28 | 西安微电子技术研究所 | Self-adaptive dual-standard component extreme value comparison decision feedback equalization circuit |
| CN113992486B (en) * | 2021-10-27 | 2023-05-12 | 西安微电子技术研究所 | Self-adaptive double-standard component extremum comparison decision feedback equalization circuit |
| CN115987728A (en) * | 2023-03-21 | 2023-04-18 | 荣耀终端有限公司 | Data processing method and electronic equipment |
| CN115987728B (en) * | 2023-03-21 | 2023-08-01 | 荣耀终端有限公司 | Data processing method and electronic equipment |
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