几种空时码容量对比

贝尔实验室提出的分层空时（layered space-time code，LSTC）主要基于空分复用思想，它的主要目的是提高系统频谱效率；而其它空时码（space-time code，STC），如空时分组码（space-time block code，STBC）、空时格码（space-time trellis code，STTC）等主要基于发射分集。它们主要利用空间分集带来的增益，包括分集增益和编码增益来对抗无线信道的各种衰落。本文从信道容量角度评估各种空时编码的性能，同时将其和相同收发天线数下多输入输出（Multiple input multiple output，MIMO）系统的信道容量进行对比。

Capacity Comparison of Several-time Codes

Layered space-time code(LSTC)proposed by Bell lAbs is mostly based on spatial multiplexing,its main object is to improve the system frequency efficiency.Yet a variety of space-time codes(STC),such as space-time block code(STBC)and space-time trellis code(STTC),are mostly based on transmit diversity.They predominantly take advantage of the gain produced by spatial diversity,including diversity gain and coding gain,to combat various fading of radio channel.This paper evaluates performance of several STC from the view of channel capacity,and at the same time,compares it with channel capacity of MIMO with the same transmit and receive antenna number.