摘要
本文从OFDM信号的矩阵表示出发,分析比较了OFDM系统中现有的各种盲信道估计方法。OFDM盲信道估计方法分为两类,一类是统计型方法,它利用了发送信号和接收信号的统计特性;另一类是确定型方法,它利用了发送调制信号的固有特性。一般而言,统计型方法的计算量较小,但是估计精度不高且估计的实时性不好;而确定型方法的估计精度较高,实时性较好,但是其计算量较大。计算机仿真表明,这些盲信道估计方法的性能受信道参数尤其是多普勒频率影响很大,盲信道估计的实用化有待进一步研究。
Based on the matrix formulation of OFDM signals, this paper analyzes a lot of existing blind channel estimation methods in OFDM systems. These methods can be classified as two classes. One is the statistical method that utilizes the statistical properties of the transmitted signals and the received signals. The other is the deterministic method that utilizes the inherent properties of the transmitted modulation signals. Generally speaking, the computational complexity of the statistical method is lower than that of the deterministic method, but can not achieve good estimation performance and real-time estimation. The deterministic method has good estimation performance and real-time estimation. However, it involves high computational complexity. Computer simulation shows that these blind channel methods are greatly influenced by the channel parameters especially the Doppler frequency. The practicality of blind channel methods is to be discussed later.
出处
《信号处理》
CSCD
北大核心
2005年第5期508-514,共7页
Journal of Signal Processing
基金
江苏省自然科学基金资助项目(BK2003015)移动通信国家重点实验室开放课题资助项目(N0302)