Optimization of LDPC Coded IDMA System

Jing Xi Zhang

doi:10.4028/www.scientific.net/AMM.148-149.1066

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 148-149Optimization of LDPC Coded IDMA System

Optimization of LDPC Coded IDMA System

Abstract:

The issue of optimization of LDPC Coded IDMA system is studied. The iterative decoding process of LDPC code is called inner iteration, and the iterative process between LDPC code and elementary signal estimator (ESE) is called outer iteration. The performance of the system is shown by BER and the complexity is indicated by iteration number. Check matrix is constructed randomly based on the obtained degree profile and simulations are made. The results show that performance of the system improves as the iteration number increases, either inner or outer iteration number. On the other hand, the performance gain of the system decreases with the increase of iteration number. Besides, the performance can be improved by reasonable setting of iteration number with the same complexity.

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Applied Mechanics and Materials (Volumes 148-149)

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1066-1071

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.148-149.1066

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Online since:

December 2011

Authors:

Jing Xi Zhang

Keywords:

Additive White Gaussian Noise (AWGN), Interleaver Division Multiple Access (IDMA), Low-Density Parity-Check (LDPC) Codes, Multiple Access Channel (MAC)

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