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Soft bit digital demodulating method and device of planisphere based on complex number space

A digital demodulation and soft bit technology, applied in the field of digital information transmission, can solve complex problems that affect receiver performance, etc., and achieve the effect of simple calculation and improved performance

Inactive Publication Date: 2012-10-17
WUHAN UNIV OF TECH
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a simple log-likelihood ratio based on the complex number space constellation for the defect that the bit-level log-likelihood is relatively complicated in the prior art and will affect the performance of the receiver. Soft bit digital demodulation method and device

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  • Soft bit digital demodulating method and device of planisphere based on complex number space

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[0037] 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.

[0038] Such as figure 1 As shown, the embodiment of the present invention is based on the soft bit digital demodulation method of the constellation diagram of the complex number space, comprising the following steps:

[0039] S1. Receive the received signal from the transmitter and perform channel estimation and channel equalization on it. The received signal is a plurality of star-point complex symbols in the constellation diagram of the complex space, and each star-point complex symbol corresponds to the coded data bit on the constellation diagram. combination;

[0040] S2. Construct the origin...

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Abstract

The invention discloses a soft bit digital demodulating method and a soft bit digital demodulating device of a planisphere based on a complex number space. The method comprises the following steps: emitting a receiving signal from an emitter and conducting the signal estimation and the signal path balance on the receiving signal, constructing an original soft bit function F1 according to a star point complex symbol; calculating the noise variance and the balance parameter of the output signal of the star point complex symbol after carrying out the signal estimation and the signal path balance; amending the original soft bit function F1 to obtain a demodulated and output soft bit function F2; according to the demodulated and output soft bit function F2, obtaining a likelihood function of the demodulated and output soft bit function F2 under the condition of different values of the symbol function, calculating and simplifying a log-likelihood ratio of the likelihood function; and decoding through the signal path decoder by using the simplified result as an input soft bit of a signal path decoder. According to the soft bit digital demodulating method and the soft bit digital demodulating device, the performance of a receiver can be improved, and the achievement of the software and hardware is facilitated.

Description

technical field [0001] The present invention relates to the technical field of digital information transmission, in particular to a soft bit digital demodulation method and device based on a complex number space constellation diagram. Background technique [0002] In modern wireless communication systems, channel coding and digital modulation techniques directly determine the bit error rate of the communication system, that is, the quality of the system performance. In the 3G mobile communication system and the post-3G LTE system, convolutional coding and Turbo coding, QPSK modulation, 16QAM modulation and 64QAM modulation are the main channel coding and digital modulation techniques. In the receiver, the input of the channel decoder is the signal after digital demodulation, and the demodulated signal can be hard bits or soft bits, but the input of soft bits to the decoder will be greatly different from that of hard bits. Lower bit error rate, so almost all practical system...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L25/03H04L27/36H04L1/00
Inventor 李平安邱石黎广焦惠芳乐高
Owner WUHAN UNIV OF TECH
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