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.
出处
《计算机技术与发展》
2012年第6期97-99,103,共4页
Computer Technology and Development
基金
广州市应用基础研究项目(2006J1-C0331)
广东工业大学博士基金项目(073016)
