东南大学学报（自然科学版）2009，Vol.39Issue(5)：873-877,5.DOI:10.3969/j.issn.1001-0505.2009.05.001
DS/CDMA系统中基于自适应并行次梯度投影的多址干扰抑制算法
MAI suppression algorithm based on adaptive parallel subgradient projection in DS/CDMA systems
摘要
Abstract
To suppress multiple access interference ( MAI) in direct sequence/code division multiple access ( DS/CDMA) systems, an algorithm based on the adaptive parallel subgradient projection is proposed. First, a stochastic property convex set containing the optimal interference suppression filter coefficients is established based on the receiving signal model. The projection onto the convex sets is converted to that onto multiple closed half-spaces by the parallel subgradient projection. Then, the inflation parameters which influence the system convergence speed and the convergence performance in steady state are analyzed, and the mechanism which adaptively adjusts inflation parameters in different iterations is designed. Finally, the updated interference suppression filter coefficients vector is projected onto a constrained set. The theoretical analysis and the simulation results show that this algorithm has fast convergence, steady interference suppression performance, and exhibits lower bit error rate and higher robustness in different noise intensities. Besides, it has lower computation complexity than other algorithms.关键词
DS/CDMA系统/自适应并行次梯度投影/多址干扰抑制Key words
direct sequence/code division multiple access system/ adaptive parallel subgradient pro-jection/ multiple access interference suppression分类
信息技术与安全科学引用本文复制引用
魏昕,赵力,邹采荣,王青云..DS/CDMA系统中基于自适应并行次梯度投影的多址干扰抑制算法[J].东南大学学报（自然科学版）,2009,39(5):873-877,5.基金项目
国家自然科学基金资助项目(60872073)、江苏省自然科学基金资助项目(BK2008291)、教育部博士点基金资助项目(20050286001). （60872073）
