| LDPC based time-frequency double differential space-time coding for multi-antenna OFDM systems |
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| 作者姓名： | 田继峰 姜海宁 宋文涛 罗汉文 |
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| 作者单位： | Department of Electronic Engineering Shanghai Jiao Tong University Shanghai 200030 China，Department of Electronic Engineering Shanghai Jiao Tong University Shanghai 200030 China，Department of Electronic Engineering Shanghai Jiao Tong University Shanghai 200030 China，Department of Electronic Engineering Shanghai Jiao Tong University Shanghai 200030 China |
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| 基金项目： | Project supported by the Hi-Tech Research and Development Pro-gram (863) of China (No. 2003AA123310) and the National Natural Science Foundation of China (No. 60272079) |
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| 摘 要： | INTRODUCTION High data rate and high quality multimedia ser- vices are required in beyond third generation (B3G) and fourth generation (4G) mobile communications. Space-time coding scheme has been proposed (Tarokh et al., 1998; 1999) to achieve higher capacity and data rate. So far, most research on space-time coding assumed that accurate channel estimations are available at the receivers. However, accurate channel estimation is difficult and too many training symbols are required in a r…
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| 关 键 词： | OFDM系统 正交频分复用 时频双微分空时译码 时变信道 频率选择性衰落 |
| 收稿时间： | 2004-08-25 |
| 修稿时间： | 2005-04-14 |
LDPC based time-frequency double differential space-time coding for multi-antenna OFDM systems |
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| Ji-feng Tian,Hai-ning Jiang,Wen-tao Song,Han-wen Luo.LDPC based time-frequency double differential space-time coding for multi-antenna OFDM systems[J].Journal of Zhejiang University Science,2006,7(2):141-148. |
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| Authors: | Ji-feng Tian Hai-ning Jiang Wen-tao Song Han-wen Luo |
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| Institution: | (1) Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai, 200030, China |
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| Abstract: | Differential space-time coding was proposed recently in the literature for multi-antenna systems, where neither the transmitter
nor the receiver knows the fading coefficients. Among existing schemes, double differential space-time (DDST) coding is of
special interest because it is applicable to continuous fast time-varying channels. However, it is less effective in frequency-selective
fading channels. This paper’ls authors derived a novel time-frequency double differential space-time (TF-DDST) coding scheme
for multi-antenna orthogonal frequency division multiplexing (OFDM) systems in a time-varying frequency-selective fading environment,
where double differential space-time coding is introduced into both time domain and frequency domain. Our proposed TF-DDST-OFDM
system has a low-complexity non-coherent decoding scheme and is robust for time-and frequency-selective Rayleigh fading. In
this paper, we also propose the use of state-of-the-art low-density parity-check (LDPC) code in serial concatenation with
our TF-DDST scheme as a channel code. Simulations revealed that the LDPC based TF-DDST OFDM system has low decoding complexity
and relatively better performance.
Project supported by the Hi-Tech Research and Development Program (863) of China (No. 2003AA123310) and the National Natural
Science Foundation of China (No. 60272079) |
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| Keywords: | Differential space-time coding OFDM Time-varying channels Frequency-selective fading LDPC |
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