| A Concatenated ML Decoder for ST／SFBC-OFDM Systems in Double Selective Fading Channels |
| |
| 引用本文： | 李明齐,张文军.A Concatenated ML Decoder for ST／SFBC-OFDM Systems in Double Selective Fading Channels[J].上海交通大学学报(英文版),2004,9(4):15-20. |
| |
| 作者姓名： | 李明齐 张文军 |
| |
| 作者单位： | Inst.ofImageComm.＆Info.Processing,ShanghaiJiaotongUniv.,Shanghai200030,China |
| |
| 基金项目： | theNational863Project(No.2003AA123310) |
| |
| 摘 要： | This paper presented a concatenated maximum-likelihood (ML) decoder for space-time/space-frequency block coded orthogonal frequency diversion multiplexing (ST/SFBC-OFDM) systems in double selective fading channels. The proposed decoder first detects space-time or space-frequency codeword elements separately. Then,according to the coarsely estimated codeword elements, the ML decoding is performed in a smaller constellation element set to searching final codeword. It is proved that the proposed decoder has optimal performances if and only if subchannels are constant during a codeword interval. The simulation results show that the performances of proposed decoder is close to that of the optimal ML decoder in severe Doppler and delay spread channels. However,the complexity of proposed decoder is much lower than that of the optimal ML decoder.
|
| 关 键 词： | 无线通信 OFDM 空时编码 ML解码器 衰落信道 |
A Concatenated ML Decoder for ST/SFBC-OFDM Systems in Double Selective Fading Channels |
| |
| LI Ming-qi,ZHANG Wen-jun.A Concatenated ML Decoder for ST/SFBC-OFDM Systems in Double Selective Fading Channels[J].Journal of Shanghai Jiaotong university,2004,9(4):15-20. |
| |
| Authors: | LI Ming-qi ZHANG Wen-jun |
| |
| Abstract: | This paper presented a concatenated maximum-likelihood (ML) decoder for space-time/space-frequency block coded orthogonal frequency diversion multiplexing (ST/SFBC-OFDM) systems in double selective fading channels. The proposed decoder first detects space-time or space-frequency codeword elements separately. Then, according to the coarsely estimated codeword elements, the ML decoding is performed in a smaller constellation element set to searching final codeword. It is proved that the proposed decoder has optimal performances if and only if subchannels are constant during a codeword interval. The simulation results show that the performances of proposed decoder is close to that of the optimal ML decoder in severe Doppler and delay spread channels. However, the complexity of proposed decoder is much lower than that of the optimal ML decoder. |
| |
| Keywords: | wireless conmmunications OFDM space-time coding ML decoding |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
