一种基于空时分组编码的MIMO-OFDM系统接收空间分集方案

A Receive Space Diversity Scheme for MIMO-OFDM Systems Based on Space-Time Block Coding

文献[1]提出了一种使用正交设计的单输入多输出正交频分复用(SIMO-OFDM)系统的空间分集接收结构,目的是为了减少接收端DFT块的数目以降低系统复杂度和减少功率消耗。由于在线性处理过程中噪声叠加的影响,造成了一定的性能损失。本文提出了一种基于空时分组编码的多输入多输出OFDM(MIMO-OFDM)系统空间分集接收方案,通过在文献[1]提出的分集结构中引入使用空时分组编码的发射分集,弥补了因减少DFT块数目而造成的性能损失。本文对使用空时分组编码后的处理过程进行了推导,并对使用空时编码前后的系统性能进行了仿真和比较。

In order to reduce system complexity and power consumption in OFDM systems with single transmitter antenna and multiple receiver antennas by reducing the number of DFT blocks,a receive space diversity architecture for OFDM systems using orthogonal designs is proposed in reference paper[ 1 ] ,but system performance is degraded by the effect of noise suporposition in the linear processing. In this paper, transmitter diversity techniques based on space-time block coding is used in the top architecture and compensate for the system performance degradation. We give a process for OFDM systems using space-time block cede and compare the performance between ＂the proposed new systems and the original systems, effective benefits can be shown in our simulations.