Multiple access interference suppression for CDMA systems via l_(∞)-minimization  

作　　者：Xue Jiang Xingzhao Liu T.Kirubarajan 

机构地区：[1]School of Electronic Information and Electrical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China [2]Department of Electrical and Computer Engineering,McMaster University,Hamilton,Ontario,L8S 4L8,Canada

出　　处：《Fundamental Research》2022年第5期799-806,共8页自然科学基础研究（英文版）

基　　金：supported by the National Natural Science Foundation of China under(Grants No.62022054 and 61971279).

摘　　要：A key problem in code-division multiple access(CDMA)system is to mitigate the multiple access interference(MAI)from other users while detecting the desired user.The performance of the conventional minimum output energy(MOE)multiuser detector for CDMA system significantly degrades in the presence of signature waveform distortions induced by multipath propagation or timing asynchronism.In this paper,a robust linear programming(ROLP)algorithm for blind multiuser detection is proposed.Different from the existing MOE-based multiuser detection techniques,the proposed ROLP minimizes the l_∞-norm of the output to exploit the non-Gaussianity of the communication signals.To achieve robustness against signature waveform mismatch,the proposed method constrains the magnitude response of any signature vector within a specified uncertainty set to exceed unity.The uncertainty set is modeled as a rhombus,which differs from the spherical uncertainty region widely taken in the existing robust multiuser detectors.The resulting optimization problem is reformulated into a linear programming program and hence can be solved efficiently.The proposed ROLP is computationally simpler than its robust counterparts that requires solving a second-order cone programming.Simulation results demonstrate the superiority of the ROLP over several robust detectors,which indicate that its performance approaches the optimal performance bound.

关 键 词：Multiple access interference(MAI) Blind multiuser detection Code-division multiple access(CDMA) Signature waveform mismatch l_(∞)-norm minimization Linear programming 

分 类 号：TP39[自动化与计算机技术—计算机应用技术]