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Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2006, Vol. 7 Issue (2 ): 6-    DOI: 10.1631/jzus.2006.A0141
    
LDPC based time-frequency double differential space-time coding for multi-antenna OFDM systems
Tian Ji-feng, Jiang Hai-ning, Song Wen-tao, Luo Han-wen
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’s 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 ΛLDPC) 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.

Key wordsDifferential space-time coding      OFDM      Time-varying channels      Frequency-selective fading      LDPC     
Received: 25 August 2004     
CLC:  TN911.3  
Cite this article:

Tian Ji-feng, Jiang Hai-ning, Song Wen-tao, Luo Han-wen. LDPC based time-frequency double differential space-time coding for multi-antenna OFDM systems. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2006, 7(2 ): 6-.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.2006.A0141     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2006/V7/I2 /6

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