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Received: 2004-04-15

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Journal of Zhejiang University SCIENCE A 2005 Vol.6 No.6 P.607-612


LDPC based differential unitary space-frequency coding for MIMO-OFDM systems

Author(s):  JIANG Hai-ning, LUO Han-wen, TIAN Ji-feng, SONG Wen-tao, LIU Xing-zhao

Affiliation(s):  Department of Electronic Engineering, Shanghai Jiaotong University, Shanghai 200030, China

Corresponding email(s):   jhn@sjtu.edu.cn, radio_sjtu@hotmail.com

Key Words:  Differential modulation, Unitary space-time codes, Space-frequency coding, MIMO, OFDM, LDPC

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 A, 2005, 6(6): 607-612.

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%T LDPC based differential unitary space-frequency coding for MIMO-OFDM systems
%A JIANG Hai-ning
%A LUO Han-wen
%A TIAN Ji-feng
%A SONG Wen-tao
%A LIU Xing-zhao
%J Journal of Zhejiang University SCIENCE A
%V 6
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%P 607-612
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%D 2005
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.2005.A0607

T1 - LDPC based differential unitary space-frequency coding for MIMO-OFDM systems
A1 - JIANG Hai-ning
A1 - LUO Han-wen
A1 - TIAN Ji-feng
A1 - SONG Wen-tao
A1 - LIU Xing-zhao
J0 - Journal of Zhejiang University Science A
VL - 6
IS - 6
SP - 607
EP - 612
%@ 1673-565X
Y1 - 2005
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.2005.A0607

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.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


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