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《Journal of Data Acquisition and Processing》 2011-04
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Improvement and Analysis of Vector Gaussian Approximation in Signal Space Diversity

Feng Wenjiang,Wang Ruru,Chen Dongcai,Liu Zheng(College of Communication Engineering,Chongqing University,Chongqing,400044,China)  
Focused on the performance improvement of receiver detection algorithm using signal space diversity,three aspects in the original algorithm are modified based on vector Gaussian approximation algorithm,including the calculation methods of probability expectation and variance with regarding to each symbol,the information dependence relationship in soft interference cancellation of the given symbol,and calculation of the probability density function.Therefore,the complexity of the algorithm is reduced and the system performance to resist delay is improved.According to simulation results and performance analysis by the new modified algorithm,under the condition of Rayleigh channels while lattice dimension N=16 and iteration number Iter=6,the BER curve is close to the ideal boundary.When bit error rate BER=10-5,the performance gap between the Rayleigh fading channel and the Gaussian channel is only 0.2 dB.In high delay requirement system,there is no degrading space for BER when the iteration number is four.
【Fund】: 国家自然科学基金(60872038)资助项目;; 重庆市自然科学基金重点(CSTC2009BA2064)资助项目;; 国家“211工程”三期建设(S-09102)资助项目
【CateGory Index】: TN911.7
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【Citations】
Chinese Journal Full-text Database 1 Hits
1 WEI Ning,ZHANG Zhong-pei,and LI Shao-qian(National Key Laboratory of Communication,University of Electronic Science and Technology of China Chengdu 610054);Decode-and-Forward Cooperative Communication with Signal-Space Diversity[J];Journal of University of Electronic Science and Technology of China;2009-06
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