MIMO系统中简单的扩展空时块编码分集技术研究

本文提出一种多输入多输出（MIMO）天线系统中简单的扩展空时块编码（SSTBC）分集技术，采用沃尔什码来区分各天线发送数据子流。采用这种方法，在系统带宽一定时，不降低发送信息速率，同时接收机简单。不同天线的发送信息经过了所有收一发天线对之间的空间子信道，获得了所有路径的部分空间分集增益，仿真结果表明，这种增益的获得不受限于接收分集阶数，并且随发射天线的增加以一定的线性关系增加。

Study on a simple diversity technique using spread space-time block coding in MIMO systems

In this paper, we propose a simple diversity technique using spread space-time block coding in multiple input multiple output (MIMO) systems. It differentiates the transmission data sub-streams on different antennas by using Walsh codes. The proposed scheme does not decrease the transmission rate within the constant bandwidth and the receiver is in low complexity. Owing to the transmission symbols of different transmit antennas pass through all the sub-channels between the transmit-receiver antenna pairs, the system obtains the partial space diversity gain of all paths. The simulation results show that the diversity gain does not be affected by the order of receiver diversity. It can also be observed that the performance improvement is almost linear with the increase of number of transmit antennas.