Lagrangian乘子法在多用户检测中的应用  

Application of Lagrangian multipliers method in multiuser detection

作　　者：刘文龙[1] 马晓红[1] 

机构地区：[1]大连理工大学电信学院,辽宁大连116024

出　　处：《通信学报》2008年第1期51-55,共5页Journal on Communications

基　　金：国家自然科学基金资助项目(60575011);大连理工大学青年教师培养基金资助项目~~

摘　　要：将二进制二次规划问题连续化为一个带等式约束的二次规划问题,借助于求解等式约束的Lagrangian乘子法,推导出Lagrangian乘子与用户信息码及信道噪声之间的关系。同时,根据多用户检测问题的特殊性,还给出了估计Lagrangian乘子的方法,进而得到了一种新的多用户检测器。仿真结果表明,新算法的误码率与最佳多用户检测器大致相同,低于一般的次最优多用户检测器。The quadratic optimization problem with binary constraints was transformed into an equivalent quadratic optimization problem with equation constraints, and applied Lagrangian multipliers method to solve optimization problem with equation constraints, the relationship among the Lagrange multipliers, user information codes and channel noises was derived. Considering the special features of multiuser detection problem, a method of estimating Lagrange multipliers was presented, whereby a new multiuser detector was obtained. The numerical experiments show that the bit-error-ratio （BER） of new detector is close to that of the optimum multiuser detector and less than that of sub-optimum multiuser detectors.

关 键 词：多用户检测 多址干扰 远近效应 码分多址 

分 类 号：TN914.5[电子电信—通信与信息系统]