| LDPC based differential unitary space-frequency coding for MIMO-OFDM systems |
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| 作者姓名： | 姜海宁 罗汉文 田继锋 宋文涛 刘兴钊 |
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| 作者单位： | Department of Electronic Engineering，Shanghai Jiaotong University，Shanghai 200030，China，Department of Electronic Engineering，Shanghai Jiaotong University，Shanghai 200030，China，Department of Electronic Engineering，Shanghai Jiaotong University，Shanghai 200030，China，Department of Electronic Engineering，Shanghai Jiaotong University，Shanghai 200030，China，Department of Electronic Engineering，Shanghai Jiaotong University，Shanghai 200030，China |
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| 摘 要： | INTRODUCTION Unitary space-time modulation (USTM) (Hochwald and Marzetta, 2000) has been shown to be ideally suited for Rayleigh flat fading channels when there is no CSI. And for continuously changing fading channels, differential unitary space-time modulation (DUSTM) was proposed in Hochwald and Sweldens (2000). However, the performance of DUSTM de-grades considerably in frequency-selective fading channels often encountered in broadband wireless communications. Hence concatena…
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| 关 键 词： | 微分调制 单一空间时间定理 空间频率译码 MIMO OFDM 直交频率分割多路技术 LDPC |
| 收稿时间： | 15 April 2004 |
| 修稿时间： | 21 September 2004 |
LDPC based differential unitary space-frequency coding for MIMO-OFDM systems |
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| Jiang Hai-ning,Luo Han-wen,Tian Ji-feng,Song Wen-tao,Liu Xing-zhao.LDPC based differential unitary space-frequency coding for MIMO-OFDM systems[J].Journal of Zhejiang University Science,2005,6(6):607-612. |
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| Authors: | Jiang Hai-ning Luo Han-wen Tian Ji-feng Song Wen-tao Liu Xing-zhao |
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| Institution: | (1) Department of Electronic Engineering, Shanghai Jiaotong University, 200030 Shanghai, China |
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| Abstract: | This paper proposes a novel LDPC based differential unitary space-frequency coding (DUSFC) scheme for MIMO-OFDM systems when neither the transmitter nor the receiver has access to the channel state information (CSI). The new DUSFC strategy basically consists of coding across transmit antennas and OFDM tones simultaneously as well as differential modulation in the time-domain. It can fully exploit the inherent advantages provided by the multipath fading channels, resulting in a high degree of diversity. The state-of-the-art low-density parity-check (LDPC) codes are concatenated with our DUSFC as channel coding to improve the bit error rate (BER) performance considerably. Owing to the maximum multipath diversity and large coding advantages, LDPC-DUSFC strongly outperforms the differential unitary space-time coded OFDM techniques recently proposed in literature. The corresponding iterative decoding algorithm without channel estimation is finally provided to offer significant performance gain. Simulation results illustrate the merits of the proposed scheme. |
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| Keywords: | Differential modulation Unitary space-time codes Space-frequency coding MIMO OFDM LDPC |
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