摘要
讨论了在Ｎａｋａｇａｍｉ多径衰落条件下，利用等增益分集接收的宽带ＤＳ／ＣＤＭＡ系统的抗衰落性能，并将之与最大比合并分集接收进行比较，提出了一种计算等增益分集接收性能的方法，它避开了目前Ｎａｋａｇａｍｉ分布随机变量和的概率密度函数难以求出这一困难，采用递归求衰落ｎ阶中心矩的方法，有效地解决了等增益分集接收性能的理论分析问题．理论分析和数值计算结果均表明，在ＤＳ／ＣＤＭＡ系统中采用等增益分集接收，可在技术复杂性大大降低的条件下获得接近最大比合并分集的性能．
The antimultipathfading performance of broadband direct sequence codedivision multiple access(DS/CDMA) systems with equal gain diversity is investigated by application of the Nakagami model. Advanced is a novel method of evaluating the performance of equal gain diversity that computes the nth central moment of the fading intensity by recursion. This approach no longer requires a knowledge of probability density function(PDF) of the summation of Nakagami variables, a currently unsolved problem. Analysis and numerical results show that the equal gain diversity when used in the DS/CDMA systems can match the performance of the maximum ratio combining diversity with reduced complexity of implementation.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
1998年第7期11-14,20,共5页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金
国家教委博士点基金
