LTE中基于发送分集的预编码

Precoding For Transmit Diversity In LTE

MIMO技术是LTE中采用的关键技术之一,本文研究的基于发送分集的预编码技术就是MIMO技术中的一种方案。本文对LTE中使用的2发射天线和4发射天线的基于发送分集的预编码方案进行了推导,并对其性能进行了仿真,将其与空时分组码方案进行了性能比较。推导结果表明LTE中基于发送分集的预编码方案与2根发射天线的空时分组码的编码原理相同。仿真结果表明在两根发射天线情况下,空时分组码的误码率性能和预编码方案相同;在4发射天线的情况下,空时分组码的误码率低于预编码方案,但预编码方案的传码率要高于空时分组码。

MIMO is one of the key tcchnology in LTE,Precoding for transmit in this paper is one of the scheme in MIMO. Precoding for transmit diversity with 2Tx and 4Tx in LTE were put forward. Simulate its performance and compare it with space-time block codes. The consequence show that precoding for transmit diversity in LTE is same with space-time block codes with 2Tx in principle. The results show that bit error rate of space-time block codes is same with precoding in the case of 2Tx. And in the case of 4Tx, bit error rate of space-time block codes is lower than precoding, but symbol rate of precoding is higher than soace-time block cadoes.