LTE-A系统中基于扩展CP的Rank 3-4解调参考信号设计

Rank 3,4 demodulation reference signal design based on extended CP for LTE-A

为了支持先进的长期演进（LTE-A）中更高阶多输入多输出（MIMO）技术，为物理下行链路共享信道（PDSCH）定义了新的解调参考信号（DMRS）。先提出了基于扩展循环前缀（CP）的参考信号设计原则，根据已确定的基于常规CP的参考信号设计方案，提出了4种基于扩展CP的Rank 3，4参考信号设计方案。为了验证设计方案的优劣，通过仿真比较了不同参考信号设计方案估计的信道和理想信道的均方误差（MSE）和相应的误块率（BLER），最终确定最佳的扩展CP的Rank 3，4参考信号设计方案。

To support the higher-order multiple input multiple output （MIMO） technology in 3GPP＇ S Long Term Evolu- tion-Advanced （LTE-A）, a new pattern of Rank 3,4 DMRS （demodulation reference signal） was designed for physical downlink shared channel （PDSCH） based on the extended cyclic prefix （CP）. The principles for design of reference signals based on extended CP were introduced. Then, the design pattern for Rank 3,4 reference signal based on the extended CP was proposed according to the decided patterns based on the normal CP. The mean squared error （MSE） performance and the block error rate （BLER） performance of the proposed DMRS patterns in the channel estimated and ideal channel were compared by simulation, and the optimum pattern was obtained ac- cordingly.