Low-complexity LDPC-coded USTM system based on dual demodulator
As compared to uncoded unitary space-time modulation (USTM), channel coded USTM has received increased attention for its large coding gain. However, low-density parity-check (LDPC) coded USTM has only received limited attention. This paper proposes a scheme of combining LDPC code with USTM for nonco...
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| Veröffentlicht in: | 10th International Conference on Wireless Communications, Networking and Mobile Computing (WiCOM 2014) S. 322 - 326 |
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| Sprache: | Englisch |
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Stevenage, UK
IET
2014
The Institution of Engineering & Technology |
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| ISBN: | 1849198454, 9781849198455 |
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| Abstract | As compared to uncoded unitary space-time modulation (USTM), channel coded USTM has received increased attention for its large coding gain. However, low-density parity-check (LDPC) coded USTM has only received limited attention. This paper proposes a scheme of combining LDPC code with USTM for noncoherent MIMO communication system over Rayleigh flat fading and additive white Gaussian noise (AWGN) channel. At the receiver, considering the soft information required by the belief-propagation (BP) iterative decoder of the LDPC code, we deduce a low complexity maximum a posteriori probability (MAP) demodulating algorithm for a special USTM based on the sine-cosine function, SC-USTM for short. We combine the MAP with the maximum likelihood (ML) demodulating algorithm based on the SC-USTM in order to generate a novel dual-demodulator for further decreasing the computational complexity of the demodulating/decoding system. For improving the performance of the receiver, the iterative feedback scheme between the MAP demodulator and the BP decoder is designed. Comparing with the uncoded USTM, our LDPC-coded USTM can obtain about 15 - 17 dB coding gain at 10-5 BER. |
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| AbstractList | As compared to uncoded unitary space-time modulation (USTM), channel coded USTM has received increased attention for its large coding gain. However, low-density parity-check (LDPC) coded USTM has only received limited attention. This paper proposes a scheme of combining LDPC code with USTM for noncoherent MIMO communication system over Rayleigh flat fading and additive white Gaussian noise (AWGN) channel. At the receiver, considering the soft information required by the belief-propagation (BP) iterative decoder of the LDPC code, we deduce a low complexity maximum a posteriori probability (MAP) demodulating algorithm for a special USTM based on the sine-cosine function, SC-USTM for short. We combine the MAP with the maximum likelihood (ML) demodulating algorithm based on the SC-USTM in order to generate a novel dual-demodulator for further decreasing the computational complexity of the demodulating/decoding system. For improving the performance of the receiver, the iterative feedback scheme between the MAP demodulator and the BP decoder is designed. Comparing with the uncoded USTM, our LDPC-coded USTM can obtain about 15 - 17 dB coding gain at 10-5 BER. |
| Author | Li Peng Lingling Yang |
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| Copyright | Copyright The Institution of Engineering & Technology Sep 26, 2014 |
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| Keywords | low complexity maximum a posteriori probability demodulating algorithm iterative feedback scheme channel coding soft information parity check codes maximum likelihood estimation AWGN channels channel coded USTM BP decoder additive white Gaussian noise channel noncoherent MIMO communication system sine-cosine function uncoded unitary space-time modulation low-density parity-check codes MIMO communication Rayleigh flat fading channel ML receiver probability Rayleigh channels demodulating-decoding system MAP demodulator maximum likelihood decoding space-time codes SC-USTM demodulators iterative decoding belief-propagation iterative decoder dual demodulator low-complexity LDPC-coded USTM system maximum likelihood demodulating algorithm AWGN channel computational complexity |
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| Snippet | As compared to uncoded unitary space-time modulation (USTM), channel coded USTM has received increased attention for its large coding gain. However,... |
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| Title | Low-complexity LDPC-coded USTM system based on dual demodulator |
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