基于LTE上行的改进LMMSE信道估计算法

摘要

对于无线通信系统来说,无线信道直接影响着其性能的好坏.然而无线信道具有随机性,为了在接收端准确恢复发射端的发送信号,这就需要对信道进行估计.LTE采用SC-FDMA作为上行多址方式,与OFDM相比,SC-FDMA一个突出的优势就是具有较低的峰均比( PAPR,Peak-to-Average Power Ratio).文中介绍了SC-FDMA系统中基于导频的信道估计LS算法和LMMSE算法,通过提出一个优化的导频结构以及运用傅里叶变换,得到一种改进的LMMSE算法.仿真结果表明,这种改进的LMMSE算法具有较低的计算复杂度和良好的性能.%The performance of wireless communication systems is affected by the wireless channel,while the wireless channel has randomness,in order to accurately recover the transmitter signal,which requires to estimate the channel. SC-FDMA system is adopted as LTE uplink multiple access scheme. Compared with OFDM,SC-FDMA has lower Peak-to-Average Power Ratio( PAPR). In this paper. An improved LMMSE channel estimation algorithm is proposed based on the Least-Squares (LS) and Linear Minimum Mean-Square Error ( LMMSE) channel estimation algorithm using pilot for SC-FDMA system. Simulation results show that the improved LMMSE algorithm has good performance and low computational complexity.