一种高效的LTE参考信号方案及其性能分析

An efficient design of LTE reference signal and performance analysis

提出一种用已编码的系统信息符号替代大部分参考信号,减少无意义参考信号插入参考信号结构,从而使得系统整体传输效率得到提高.两天线发射分集条件下,该参考信号结构所插入无意义参考信号的数量比LTE原有方案减少了97.5%,只占整个数据帧中可用时频资源的0.238%,并且通过迭代信道估计和再次译码,误码率性能略优于原方案.四天线时,该参考信号结构所插入无意义参考信号的数量比LTE原有方案减少了96.7%,性能上也比原结构稍有提高.另外,对该参考信号结构在不同衰落、不同码率、不同多普勒频移等多种条件下的性能进行了比较.

A system presented that replace most of the reference signal using the encoded system symbols to reduce the meaningless reference signal,which maked the overall system transmission efficiency was improved.In the condition of two transmit antennas,the number of meaningless reference signal inserted in a single frame of the proposed structure has reduced 97.5% than the LTE structure,0.238% of the usable time-frequency resource only.Moreover,through the iterative channel estimation and re-decoding,the bit error rate performance of the proposed structure was slightly better than the original program.Four antennas,the proposed structure saved 96.7% of the meaningless reference signal,and the performance was also slightly increased compared with the original structure.In addition,the compares of the performance between the proposed structure and the original program in different kinds of multipath fading,different code rates and different Doppler shifts are shown.