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Improved globular decoding algorithm for overlapped coding multiplex

A decoding algorithm and overlapping coding technology, applied in the direction of error correction/error detection using convolutional codes, error correction/error detection by combining multiple code structures, digital transmission systems, etc. lower problem

Inactive Publication Date: 2009-03-18
SHANDONG UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of large amount of calculation and low error correction performance in the decoding algorithms of OvCDM and Turbo-OvCDM systems, the present invention provides an improvement for overlapping code multiplexing that reduces the amount of decoding calculation and can obviously improve the error correction performance Sphere Decoding Algorithm

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  • Improved globular decoding algorithm for overlapped coding multiplex
  • Improved globular decoding algorithm for overlapped coding multiplex
  • Improved globular decoding algorithm for overlapped coding multiplex

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Embodiment Construction

[0018] The algorithm program code of the present invention is as follows:

[0019] tempsum = 0.0;

[0020] for(n_j=0; n_j

[0021] {

[0022] pAp_llr=

[0023] (inner_output_apriori_llr_frame+n_i*CODE2_OUTPUT_NUM+n_j);

[0024] if(sqrt((R_r-S_r)^2+(R_i-S_i)^2)<=r)

[0025] *pAp_l lr=exp(*pAp_l lr);

[0026] else

[0027] *pAp_llr=0;

[0028] tempsum+=*pAp_llr;

[0029] }

[0030] for(n_j=0; n_j

[0031] {

[0032] pAp_llr=(inner_output_apriori_llr_frame+n_i*CODE2_OUTPUT_NUM+n_j);

[0033] *pAp_llr=*pAp_llr / tempsum;

[0034] *pAp_llr=log(*pAp_llr);

[0035] }

[0036] Accompanying drawing has provided AWGN (additive white Gaussian noise) channel and uses the serial Turbo-OvCDM system performance chart of decoding algorithm of the present invention and traditional ...

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Abstract

The invention discloses an improved sphere decoding algorithm aiming at superimposed decoding reuse (OvCDM), wherein when the algorithm calculates the channel transition probability of each accepted symbol, a circle with an accepted symbol as the centre of circle and with r as the radius is selected, only the channel transition probability between K' constellation points whose distance to the accepted symbol is smaller than or equal to r and the accepted symbol is calculated, and the channel transition probability between other K-K' probability constellation points and the accepted symbol is set to be zero. The sphere decoding algorithm of the invention improves the OvCDM code decoding algorithm and greatly reduces the number of constellation points which need calculating in decoding through combining a traditional OvCDM code decoding algorithm and the sphere decoding algorithm, the decoding calculation amount is lowered, and simultaneously the algorithm also can prominently improve the error-correcting performance since the disturbance of useless constellation points to decoding is reduced.

Description

technical field [0001] The invention relates to a decoding algorithm of overlapping code multiplexing (OvCDM), which improves the calculation method of the channel transfer probability of output constellation points in the OvCDM decoding algorithm. Background technique [0002] Overlapped Code Division Multiplexing (OvCDM: Overlapped Code Division Multiple) technology is a new code multiplexing method and technology with high spectral efficiency. This technology uses parallel convolutional codes with a code rate higher than 1 to greatly improve the capacity and spectrum efficiency of communication systems while providing high coding gain. [0003] By studying the OvCDM system, it can be found that the decoding algorithm plays a very important role in the error correction performance of the system. Several commonly used decoding algorithms mainly include MAP (Maximum Posteriori Probability), Log-MAP (Log-Maximum Posteriori Probability) and SOVA (Soft Output Viterbi Algorithm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M13/23H03M13/29H04L1/00
Inventor 袁东风官鑫
Owner SHANDONG UNIV
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