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
Hauptverfasser: Li, Peng, Yang, Lingling
Format: Tagungsbericht
Sprache:Englisch
Veröffentlicht: Stevenage, UK IET 2014
The Institution of Engineering & Technology
Schlagworte:
Codes
Other topics in statistics
Radio links and equipment
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
ISBN:1849198454, 9781849198455
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Beschreibung
Zusammenfassung: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.
Bibliographie:ObjectType-Article-1
ObjectType-Feature-2
SourceType-Conference Papers & Proceedings-1
content type line 22
ISBN:1849198454
9781849198455
DOI:10.1049/ic.2014.0121