Multi-layer channel decoding method

A channel decoding and decoding technology, which is applied in the direction of encoding, code conversion, encoding components, etc., can solve the problems of low implementation complexity, low implementation complexity of SIHO method, and performance deterioration.

Inactive Publication Date: 2007-10-31
BEIJING SAMSUNG TELECOM R&D CENT +1
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Problems solved by technology

The former can use the so-called symbol-based MAP decoding method, which maintains the likelihood information of each decoding layer to achieve better decoding performance, but its implementation complexity is high, even if it is simplified The method Max-log-map has a computational complexity at least twice that of the Viterbi decoding method
In the latter, the complexity of the decoding method is small due to the hard judgment at different layers, but the subsequent decoding layer is forced to use the result of the previous decoding layer with a probability of one. If

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[0018] Referring to Fig. 1, consider the quadrature amplitude modulation MQAM (Quadrature Amplitude Modulation) of convolutional code and M system (M=2 m ) combined coding method, each m-dimensional vector u k ={u k，1 , u k，2 ,...,u k，m} will be mapped to one of the M constellation points in MQAM. At some time k, a set of (X k , Y k ) real-valued symbol, so correspondingly at time k the received signal (A k , B k ) can be written as:

[0019] A k =a k x k +I k , B k =a k Y k +Q k , (1)

[0020] where a k is the Rayleigh random fading channel, I k and Q k , are two uncorrelated Gaussian noises with mean zero and variance σ N 2 .

[0021] with each encoder output bit u k，i , i=1,..., L, the likelihood value Logarithm Likelihood Ratio (LLR) of the relevant soft decision information, that is, the branch path metric value of the demodulator in the decoding method, can be expressed as:

[0022] L ( ...

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Abstract

A multiple layers channel decoding method of communication system comprises steps: calculating the original branch path magnitude corresponding with all decoding layer; in every decoding layer, updating the original branch path magnitude corresponding with the decoding layer based on the prior information of relative decoding layer generated by iteration step or the prior information of relative other decoding layer generated by current iteration step; coding the result of updating; and repeating the updating step and the coding step until the set iteration times is achieved; deciding the likelihood information of coding layer output in said steps to obtain the estimated value of ratio sequence. Adopting the coding method of said mechanism, comparing with traditional coding method with soft input and soft output, the performance is similar, at some SNR points, perfect performance is put up, and less calculation complexity, it is easy to be realized, power can be decreased, delay of coding is small.

Description

technical field [0001] The present invention relates to the technical field of communication, in particular to a multi-layer channel decoding method aimed at a multi-layer channel coding method jointly optimized for coding and modulation in a communication system. Background technique [0002] In a digital communication system, when the transmission rate of information increases, the bit error rate generated by the system will increase. How to solve the increase in the bit error rate caused by increasing the transmission information rate is a very meaningful research direction in the design and practice of communication systems . Combining channel coding and modulation to jointly optimize channel coding can greatly improve the performance of the system. [0003] Multi-level channel coding (Multi Level channel code, referred to as MLC) is a main way of combining channel coding and modulation, and it can also be called multi-level or multi-stage channel coding. As shown in Fi...

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Application Information

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IPC IPC(8): H04L1/00H04L27/02H03M13/00
Inventor 王春花朴范镇
Owner BEIJING SAMSUNG TELECOM R&D CENT
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