具有低复杂度的LDPC已编码非相干酉空时调制系统设计

doi:10.3969/j.issn.1000-436x.2014.02.019

Journal on Communications ›› 2014, Vol. 35 ›› Issue (2): 146-152.doi: 10.3969/j.issn.1000-436x.2014.02.019

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LDPC-coded unitary space-time modulation with low-complexity iterative demodulate-decoding scheme

Li-jiao WANG,Lin ZHANG,Ling-ling YANG,Li PENG,Da-wei FU

Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China

Online:2014-02-25 Published:2017-07-25
Supported by:
The National Natural Science Foundation of China

Abstract

Abstract:

A practical low-density parity-check(LDPC) coded unitary space-time modulation (USTM) noncoherent MIMO communication system over Rayleigh flat fading and additive white Gaussian noise (AWGN) channel was con-structed, where the LDPC code is selected from IEEE 802.16e Standard and USTM is constructed by the unitary matrix based on the sinc-cosinc function, SC-USTM for short. At the receiver, the maximum a posteriori probability (MAP) de-modulating algorithm of the SC-USTM was first designed; for reducing the complexity of MAP demodulator, the dual demodulator was then conceived; for improving the performance, the iterative feedback between the belief propagation (BP) decoder and the MPA demodulator was finally introduced. The simulation test shows that the system of the LDPC coded SC-USTM is superior to the uncoded SC-USTM about 15～17 dB at BER10^?5, and this system has very low complexity.

Key words: multiple-input multiple-output system, low-density parity-check codes; iterative feedback, unitary space time modulation, maximum a posteriori probability demodulation

Li-jiao WANG,Lin ZHANG,Ling-ling YANG,Li PENG,Da-wei FU. LDPC-coded unitary space-time modulation with low-complexity iterative demodulate-decoding scheme[J]. Journal on Communications, 2014, 35(2): 146-152.

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References 9

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