采用非线性串行干扰消除的DS-CDMA系统中最优检测顺序的研究  

Research of optimal detection order in DS-CDMA systems with nonlinear successive interference cancellation

作　　者：周朝荣[1,2] 李乐民[1] 张翼德[3] 冯钢[3] 

机构地区：[1]电子科技大学通信与信息工程学院,成都610054 [2]四川师范大学物理与电子工程学院,成都610068 [3]电子科技大学通信抗干扰技术国家级重点实验室,成都610054

出　　处：《计算机应用研究》2009年第9期3421-3424,共4页Application Research of Computers

基　　金：国家自然科学基金资助项目(60772142);国家"973"重点基础研究发展计划资助项目(2007CB310604)

摘　　要：在采用串行干扰消除的DS-CDMA系统中,不同的检测顺序导致不同的系统性能。研究在这样的系统中如何调整检测顺序以最小化总发射功率的问题。不同于已有研究,考虑非理想情况下的非线性串行干扰消除接收机,并且外小区干扰不再假设为独立于用户发射(接收)功率。在这样的前提下,根据给定检测顺序下最优功率分配的表达式,推导出了能够最小化总发射功率的最优检测顺序。仿真实验展示了不同检测顺序下系统的发射功率要求,证实了最优检测顺序有助于降低总发射功率。相应地,可将基于最优检测顺序的功率分配机制用于实际系统。In DS-CDMA systems with successive interference cancellation （ SIC）, different detection orders result in different system performance. This paper studied how to adjust the detection order to minimize the total transmission power in this kind of systems. Unlike existing work, considered the receiver of imperfect nonlinear SIC and supposed that the other cell interference was no longer independent of users＇ transmission （received） power. Under these presuppositions, derived the optimal detection order to minimize the total transmission power according to the optimal power allocation formulas under the given de- tection order. Simulation experiments demonstrate the total transmission 15ower requirements of system under different detection orders and validate that the optimal detection order benefits to reduce the total transmission power. As a result, the power allocation scheme based on the optimal detection order can be used in real systems.

关 键 词：串行干扰消除 检测顺序 功率分配 外小区干扰 

分 类 号：TN911[电子电信—通信与信息系统]