Maximum a posteriori semi-blind channel estimation for OFDM systems operating on highly frequency and time selective channels

被引：0
|
作者：
Siala, M [1 ]
机构：
[1] SUPCOM, Ariana, Tunisia
来源：
ANNALES DES TELECOMMUNICATIONS-ANNALS OF TELECOMMUNICATIONS | 2002年 / 57卷 / 9-10期
关键词：
transmission channel; radiocommunication; selective fading; Rayleigh fading; time variable channel; parameter estimation; Karhunen Loeve transformation; orthogonal frequency division multiplexing; modeling; numerical simulation; statistical estimation;
D O I：
暂无
中图分类号：
TN [电子技术、通信技术];
学科分类号：
0809 ;
摘要：
We propose a semi-blind block-by-block channel estimation algorithm for OFDM systems operating in highly frequency and time selective channels. This algorithm, based on the Expectation-Maximization algorithm, performs an iterative maximum a posteriori estimation of the channel. It can incorporate the coded structure of each coded block in a turbo-processing fashion to enhance channel estimation quality Moreover; it call use the maximum a posteriori training-based channel estimation algorithm for its optimum initialization. The performance of this channel estimation algorithm is evaluated through simulation results, with and without turbo-processing and optimum initialization. It is also compared to two benchmarks based on least-square error channel estimation. Our algorithm can be potentially applied for the efficient estimation of the propagation channel in DRM, DVB-T, HIPER-LAN/2 and IEEE 802.11a systems.
引用
收藏
页码：873 / 924
页数：52
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