Totally blind APP channel estimation for mobile OFDM systems

被引：7
|
作者：
Sanzi, F [1 ]
Necker, MC
机构：
[1] Univ Stuttgart, Inst Telecommun, D-70569 Stuttgart, Germany
[2] Univ Stuttgart, Inst Commun Networks & Comp Engn, D-70569 Stuttgart, Germany
来源：
IEEE COMMUNICATIONS LETTERS | 2003年 / 7卷 / 11期
关键词：
blind channel estimation; iterative decoding; orthogonal frequency-division multiplexing (OFDM);
D O I：
10.1109/LCOMM.2003.820085
中图分类号：
TN [电子技术、通信技术];
学科分类号：
0809 ;
摘要：
A new two-dimensional blind channel estimation scheme for coherent detection of orthogonal frequency-division multiplexing (OFDM) signals in a mobile environment is presented. The channel estimation is based on the a posteriori probability (APP) calculation algorithm. The time-variant channel transfer function is completely recovered without phase ambiguity with no need for any pilot or reference symbols, thus maximizing the spectral efficiency of the underlying OFDM system. The phase ambiguity problem is solved by using a 4-QAM (quadrature amplitude modulation) scheme with asymmetrical arrangement. The results clearly indicate that totally blind channel estimation is possible for virtually any realistic time-variant mobile channel.
引用
收藏
页码：517 / 519
页数：3
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