An equalization method that makes full use of channel multipath characteristics

An equalization method and channel technology, applied in transmission control/equalization, shaping network in transmitter/receiver, digital transmission system, etc. The effect of low rate and improved accuracy

Active Publication Date: 2021-07-13
FUZHOU UNIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the MAP equalization method based on message delivery, the traditional method is to perform independent message calculation for each received packet to obtain the estimated value of the transmitted symbol for each packet. Such processing cannot make good use of the multipath characteristics of the channel.

Method used

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  • An equalization method that makes full use of channel multipath characteristics
  • An equalization method that makes full use of channel multipath characteristics
  • An equalization method that makes full use of channel multipath characteristics

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Embodiment 1

[0069] The multipath channel has a total of dc=8 paths, BT=0.001, where B is the Doppler frequency shift, T is the symbol duration, the fading factors of each path obey the Rayleigh distribution, and the time delay distribution of each path is [01246101114]*T, corresponding to The power distribution of each path is [-7-310-2-6-7-1]dB. The channel impulse response length Lh=15, L=Lh-1=14. The channel is superimposed with white Gaussian noise.

[0070] The received symbol packet length is LY=16, the transmitted symbol packet length is LX=30, and the number of iterations is 5.

[0071] The sampling output after receiving the filter, after removing the previous 14 symbols, is grouped in groups of 16 to obtain all received symbol groups, and the symbols of each group are numbered from 1.

[0072] The following describes the processing of the second received symbol group. For other received packets, except that the channel impulse response and received symbol values ​​are differe...

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Abstract

The invention relates to an equalization method that fully utilizes channel multipath characteristics. This method makes full use of the delay spread characteristics of multipath channels to improve the equalization performance; this method sequentially performs matched filtering, sampling, grouping of received symbols, construction of channel factor matrix, iterative calculation and judgment of symbols in groups to messages; , use the message of part of the symbols of the next received group as the external information of the corresponding symbol of the current group to participate in the operation; when making a judgment, the absolute value of the confidence rate of the symbol sent after the current group and the absolute value of the confidence rate of the symbol sent in the previous part of the next group Values ​​are compared one by one, if the latter is greater than the former, the confidence rate of the next group is used to replace the confidence rate of the current group; through these two aspects of processing, the confidence rate of the sent symbol group is improved, the decision accuracy is improved, and the balanced BER Lower BER than processing that does not take full advantage of the channel's multipath characteristics.

Description

technical field [0001] The invention relates to the equalization technology of the receiving end of the communication system, in particular to an equalization method which fully utilizes the multipath characteristic of the channel. Background technique [0002] In the wireless mobile communication system, the channel is multi-path and variable, so that it has dual selectivity in the frequency domain and time domain, and inter-symbol interference occurs during the transmission of the transmitted signal, resulting in a high reception error rate. Therefore, the receiving end needs more effective equalization and signal correction to reduce the bit error rate so that the next stage of channel decoding can play a better role. [0003] For the equalization of single-carrier communication, the traditional processing methods are linear transversal filtering method and nonlinear decision feedback method (DFE). Their computational complexity is low, and increases linearly with the inc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/005H04L25/03
CPCH04B7/005H04L25/03006
Inventor 郭里婷陈平平
Owner FUZHOU UNIV
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