基于改进的VCFR物理层上行共享信道估计方法研究

Research on an Improved VCFR Channel Estimation Method for PUSCH

摘要:

针对DFT的信道估计算法不能解决由于信道信息能量在时域的拓展造成误去除有效信号径而导致的性能下降问题,研究了一种通过添加虚拟频率响应的信道估计算法[7]；然而这种方法不能满足LTE物理层上行共享信道复杂的环境；故提出了一种采用新的窗函数和差异化去噪策略的改进的添加虚拟频率响应的信道估计算法；该算法具有较高的频带利用率,高速率传输能力和多路径衰落影响小等优点,所以在无线通信系统中得到了广泛的应用；理论分析和仿真验证表明,该算法能够有效地提高信道估计精度和系统性能,使得系统的误码率最大约提升2个dB左右,系统吞吐量较3GPP协议所要求的提升约4 dB左右。

Abstract:

Because the DFT-based channel estimation method could not slove the degradation of performance caused by the energy leakage from non-sample locations of the multipath timing, we research on a channel estimation method by adding virtual channel frequency response (VCFR) [7]. However, this VCFR method cannot adapt to the complicated situations of the uplink reception for LTE Physical Uplink Shared Channel(PUSCH). Owing to the above issue, an improved method which adopts a novel frequency window function and a new noise reduction strategy is presented. The superiority of the proposed method over other VCFR channel estimation methods is verified in performance and flexibility to various multipath fading channels. So it is widely used in wireless communication system. Theoretical analysis and simulation experiments show that this method can effectively improve the channel estimation accuracy and system performance. It can also improve the system error rate about 2 dB and the throughput of the system can also improve about 4 dB than the 3GPP requirement.