OFDM系统中基于恒模的盲信道估计算法
Constant Modulus Based Blind Channel Estimation for Orthogonal Frequency Division Multiplexing Systems
-
摘要: 该文提出了一种适用于采用PSK调制方式的正交频分复用(OFDM)系统的准盲信道估计算法。该算法首先利用系统信号的恒模特性得到有限个可能的信道，然后利用信号的有限字符特性从可能信道中寻找出最佳信道，因而具有较低的计算复杂度。与现有的盲信道估计算法不同，该算法利用二阶统计量而不是高阶统计量估计信道，获得了较好的估计性能。仿真结果表明，该算法的性能优于基于有限字符特性的盲信道估计算法。
-
关键词:
- 正交频分复用; 盲信道估计; 恒模
Abstract: A novel blind channel estimation scheme is proposed for Orthogonal Frequency Division Multiplexing (OFDM) systems employing PSK modulation. This scheme is composed of obtaining a small number of possible channels by exploiting the constant modulus property and choosing a best fit over the possible channels by exploiting the finite alphabet property of information signals, thus it has low computation complexity. It estimates the channel by exploiting the second-order statistics rather than the high-order statistics of the received signal, which means that the new algorithm can achieve competitive performance. Simulation results show that the new scheme outperforms the finite-alphabet based channel estimator. -
Park J J K, Hong D. Performance analysis of channel estimation in OFDM systems[J].IEEE Signal Processing Letters.2005, 12(1):60-62[2]Zhou S, Giannakis G B. Finite-alphabet based channel estimation for OFDM and related multicarrier systems[J].IEEE Trans. on Communications.2001, 49(8):1402-1414[3]Li C, Roy S. Subspace-based blind channel estimation for OFDM by exploiting virtual carriers[J].IEEE Trans. on Wireless Communications.2003, 2(1):141-150[4]Muquet B, Courville M D, Duhamel P. Subspace-based blind and semi-blind channel estimation for OFDM systems[J].IEEE Trans. on Signal Processing.2002, 50(7):1699-1712[5]Necker M C, Stuber G L. Totally blind channel estimation for OFDM on fast varying mobile radio channels[J].IEEE Trans. on Wireless Communications.2004, 3(5):1514-1525[6]Treichler J R, Agee B G. A new approach to multipath correction of constant modulus signals[J].IEEE Trans. on Acoustics, Speech, and Signal Processing.1983, 31(2):459-472[7]Kue R. Introduction to Digital Signal Processing. New York: Mcgraw-Hill Book Company, 1988: 242-244. -
计量
- 文章访问数: 2188
- HTML全文浏览量: 85
- PDF下载量: 917
- 被引次数: 0
下载:
