一种基于叠加编码的下行链路功率优化方案  

A superposition based optimization scheme for downlink cellular system

作　　者：杨郑玉[1] 张祖凡[1] 吴爱爱[1] 杨静[1] 

机构地区：[1]重庆邮电大学,重庆400065

出　　处：《重庆邮电大学学报（自然科学版）》2011年第6期665-669,684,共6页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：重庆市科技攻关计划项目(CSTC;2010AC2143;STC;2009AA2037);重庆市自然科学基金项目(CSTCjjA40014);教育部"春晖计划"合作科研项目(Z2009-1-63017)~~

摘　　要：传统的物理层网络编码虽然可以通过数据流的耦合减少网络中数据包的传输数量,从而在一定程度上改善无线通信系统的传输性能,但在进一步节约资源,提高系统容量等方面依然存在一些问题。为此,在传统节点级网络编码基础上,给出了一种适用于蜂窝小区下行链路的叠加编码方案。该方案通过基站与用户间协作,在网络编码的基础上对用户信道状态进行区分从而实现信息的叠加传输,进而实现下行链路功率优化发送并提高系统容量。理论分析与计算机仿真表明,在给定的功率约束条件下,采用叠加编码方案后的系统容量优于传统网络编码的系统容量。Although the traditional network coding scheme can improve the transmission performance of wireless communication system by reducing the transmission packets in the system, it still has problems in conserving resources and enhancing capacity. Based on the theory of traditional network coding, this paper investigates a superposition coding scheme for downlink transmission which can optimize the transmit power of base station. In the approach, the base station can transmit messages in a superposition way by use of the channel states division through collaborating with users. Thereby it is possible to reduce the average transmit power of the base station and improve the capacity of the system. The comparison between the performances of the superposition scheme and traditional network coding in a power constraint condition and the simulation results show that the superposition scheme can achieve much better system capacity.

关 键 词：移动通信 网络编码 叠加编码 功率优化 

分 类 号：TN911.22[电子电信—通信与信息系统]