分布式天线系统信道容量的分析  

Channel Capacity Analysis of Distributed Antenna Systems

作　　者：张宁波[1,2] 康桂霞[1,2] 曹鹏[1,2] 张平[1,2] 刘泽民[1] 

机构地区：[1]泛网无线通信教育部重点实验室(北京邮电大学),北京100876 [2]北京邮电大学无线新技术研究所,北京100876

出　　处：《北京邮电大学学报》2008年第6期125-128,共4页Journal of Beijing University of Posts and Telecommunications

基　　金：国家"863计划"项目(2006AA01Z2722006AA01Z283);国家自然科学基金项目(60502038);高等学校学科创新引智计划项目(B07005)

摘　　要：为了研究分布式多天线系统(MIMO-DAS)的信道容量,提出多小区MIMO-DAS信道模型,推导出MIMO-DAS下行传输的各态历经信道容量的表达式.利用该表达式,可以比较分布式天线系统和集中式天线系统的信道容量.仿真结果表明,分布式系统在小区80%的范围内要比集中式系统有较大的容量增益,而且,选择较少最优的天线会显著提高信道容量,当选择1根最佳天线时信道容量达到最大.To analyze the channel capacity of multiple input multiple output-distributed antenna systems （MIMO-DAS）, a multiple cell channel model is proposed, and the closed-form expression for the ergodic capacity of downlink transmission in MIMO-DAS is also derived. Based on this expression, the channel capacities of distributed systems and centralized systems are compared. Simulation results show that compared with centralized systems, distributed systems improve channel capacity in the over 80 % area of the cell, it is also shown that fewer optimal antennas are selected for transmission can get capacity gains greatly, when one optimal antenna is chosen, the channel capacity reaches the peak.

关 键 词：分布式多入多出系统 集中式天线系统 信道容量 天线选择 

分 类 号：TN911.22[电子电信—通信与信息系统]