一种提高TD-LTE系统带宽效率的时域预编码研究

摘要

This paper designs a new time domain precoding for an OFDM system in order to eliminate the cyclic prefix (CP) and achieve a higher bandwidth efficiency. In this paper, we give the construction of modulation matrix. On this basis, memory characteristics and symbols feedback were introduced, and then TDP( time-domain precoder) precoding module was designed. By adding the TDP precoding module simulation to the TD-LTE downlink, it can achieve the same effect with CP in the OFDM system. Compared to the OFDM system with CP, the mew system's performance dropped shghtly, however, it can eliminate the redundancy without the need to send the CP signals, so the bandwidth efficiency increases greatly.%为了消除OFDM系统中的循环前缀(cyclic prefix,CP), 以实现更高的系统带宽效率,设计了一种新的时域预编码.给出了发送调制矩阵的构造方法,并在此基础上引入了记忆特性和符号反馈,设计了TDP预编码模块.通过在TD-LTE下行链路中增加TDP预编码模块,达到了与CP在OFDM系统中同样的性能.仿真结果表明,与具有CP的OFDM系统相比较,新系统的误码性能仅有很小的下降,并且由于不再需要发送CP信号,消除了冗余,带宽效率大大提高.