High speed and higher-order variable step size self-adaptive equalization method

An adaptive equalization and variable step size technology, applied in the field of aerospace data transmission, can solve the problems of low efficiency, achieve the effect of overcoming low efficiency, high average channel spectrum efficiency, and improving performance and applicability

Active Publication Date: 2017-05-10
XIAN INSTITUE OF SPACE RADIO TECH
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Problems solved by technology

[0004] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art, to provide a high-speed high-order variable step size adaptive equalization method, which overcomes the disadvantage of low efficiency

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  • High speed and higher-order variable step size self-adaptive equalization method

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Embodiment

[0052] Hereinafter, an embodiment of the present invention is given by taking 8PSK, 16APSK, 32APSK equalization, two input signals, and the equalization filter coefficient as 13th order as an example.

[0053] 1. Time Domain Parallel Equalizer

[0054] According to the requirements of the input data rate, the input data is serial-parallel converted, and the time-domain parallel equalizer equalizes the input 2m channel data in the time domain, and then uses the input weight coefficient variable to update the weight coefficient of the time-domain filter, and the result will be used as the final The balanced data output.

[0055] Such as figure 1 As shown, the specific implementation of the time-domain parallel filter is as follows:

[0056] (1) Delay the input data first. Take two channels of parallel data as an example: when the first channel of data is balanced, the first channel of data is delayed by 7 beats, and the first channel of data is delayed by 6 beats; when the se...

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Abstract

A high speed and higher-order variable step size self-adaptive equalization method is disclosed and comprises the following steps: output data of a demodulator is used as input data which is subjected to series-to-parallel conversion operation, parallel data can therefore be obtained, output data of a parallel filter is obtained via use of a parallel filter weight vector, expectation value of the output data of the parallel filter is obtained, theoretical error value of self-adaptive equalization can be calculated and obtained, step size factors adopted for current self-adaptive equalization can be calculated and obtained via the theoretical error value of the self-adaptive equalization, a parallel filter weight vector for next time of self-adaptive equalization can be obtained, and one time of self-adaptive equalization can be completed. According to the method, high speed self-adaptive equalization technologies are adopted, high speed data transmission can be realized in favorable information channel conditions, low speed data transmission can be realized when the information channel conditions deteriorates, high average value information channel frequency spectrum efficiency can be provided according to time varying characteristics of an information channel while bit error rates are not affected, and a defect of low efficiency of a conventional non-self-adaptive transmission method can be overcome.

Description

technical field [0001] The invention relates to the field of aerospace data transmission, in particular to a high-speed high-order variable step size self-adaptive equalization method. Background technique [0002] In a high-speed satellite communication system, if the transmission parameters can be adaptively changed according to the satellite channel conditions, the performance of the communication system can be greatly improved, so people have proposed an adaptive transmission technology. Adaptive transmission technology overcomes the shortcomings of low transmission efficiency of traditional non-adaptive communication systems, and can transmit data at high speed under favorable channel conditions, and transmit data at low speed when the channel becomes poor, so that the data can be transmitted without sacrificing the bit error rate. , according to the time-varying nature of the channel, it provides a higher average channel spectral efficiency, and finally improves the tr...

Claims

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Application Information

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IPC IPC(8): H04L25/03
CPCH04L25/03019H04L25/03082H04L25/03885
Inventor 杨丽汪滴珠杨光文徐常志靳一
Owner XIAN INSTITUE OF SPACE RADIO TECH
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