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A soft information acquisition method and device suitable for pi/4_dqpsk

An acquisition method and soft information technology, which is applied in the field of information transmission and can solve problems such as large time delays

Active Publication Date: 2019-07-12
SHENZHEN TONGCHUANG COMM
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Problems solved by technology

[0006] The purpose of the present invention is to provide a soft information acquisition method suitable for pi / 4_DQPSK, to solve the problem that the prior art calculates the LLR average amplitude for a period of time, and then normalizes it to the average value suitable for the LDPC decoding module. It will bring a certain delay, and the more complete the statistics, the more data is needed, and the greater the delay

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  • A soft information acquisition method and device suitable for pi/4_dqpsk

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[0028] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0029] The purpose of the embodiments of the present invention is to provide a soft information acquisition method suitable for pi / 4_DQPSK to solve the problem in the prior art that due to the influence of noise and the non-ideality of AGC automatic gain, the amplitude of the received signal will change, thus The mean and variance of LLR causing the logarithmic likelihood ratio also fluctuate within a certain range. This fluctuation causes difficulties in truncation of the log-likelihood ratio LLR since the decoding module pairs need to be of suitable magnitude. In order to truncate the LLR, the u...

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Abstract

The invention provides a soft information acquiring method suitable for pi / 4_DQPSK. The soft information acquiring method comprises the steps of before signal demodulation, performing normalized correction on the amplitudes of two adjacent signals which are received; calculating corresponding soft information according to the two adjacent signals after normalized correction, and performing decoding according to the soft information. The soft information acquiring method provided by the invention does not depend on channel quality and has advantages of low complexity, low delay and easy hardware realization.

Description

technical field [0001] The invention belongs to the field of information transmission, and in particular relates to a soft information acquisition method and device suitable for pi / 4_DQPSK. Background technique [0002] When demodulating the received signal, there are two methods of hard decision and soft decision. Soft decisions do not immediately determine whether a received bit is 0 or 1. For a decoder based on log likelihood ratio (English full name is Log likelihood Ratio, English abbreviation is LLR), the receiver assigns each bit a multi-level scale value indicating the probability of the bit being 1 or 0, that is, for Likelihood ratio (LLR) probabilities. An integer in a certain range, ie soft information, is used to represent the multi-level scale value of each bit. The larger the value range of the soft information input to the decoder, the better the performance of the decoder and the lower the bit error rate. [0003] However, for fixed-point implementation, ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/233
CPCH04L27/233
Inventor 李发军林威刘静蕾杨玉斌
Owner SHENZHEN TONGCHUANG COMM