分层空时架构的MIMO无线通信系统模型

MIMO wireless communication system model based on layered space-time architecture

针对分层空时多输入多输出无线通信系统进行研究。提出基于不等差错保护的速率兼容删除卷积编码和信道状态信息的分层空时多输入多输出系统模型,其中速率兼容的删除卷积编码器根据子信道增益分配速率兼容的删除卷积码数据流,利用发射机端的信道状态信息来区分通过多天线发射的给定数据流的发射功率,为不同的发射天线使用不同的分配功率和码速率;推导出在瑞利衰落环境下系统模型的误码率解析表达式。仿真结果表明,提高编码速率可获得16.7%的带宽效率提高,发射功率可获得近4 dB的性能改善,相比目前先进的基于UEP的LST MIMO方案有大约2 dB~3 dB的性能改善。

Layered space-time multiple-input multiple-output(MIMO)wireless communication system was studied.Layered space-time MIMO system model was proposed based on unequal error protection using rate-compatible punctured convolutional codes and channel state information,where rate-compatible punctured convolutional encoder assigned rate-compatible punctured convolutional coding data flow according to the sub-channel gains,and channel state information at the transmitter was used to differentiate the transmit powers given to the data streams transmitted by the multiple antennas,which consequently allowed the use of differently allocated power and code rates for different transmit antennas.The analytical expression of the bit error rate of the system model under Rayleigh fading was derived.The simulation results show that the bandwidth efficiency can be improved by 16.7%by increasing the encoding rate,a performance improvement of nearly 4 dB can be achieved for transmitted power,and about 2 dB to 3 dB performance improvement is achieved using the proposed method compared with that using the current advanced UEP-based LST MIMO schemes.