Clipping Noise-Aided Message Passing Algorithm for SCMA-OFDM System

Sparse code multiple access combined with orthogonal frequency division multiplexing (SCMA-OFDM) is a promising wireless air-interface technology for fifth generation (5G) networks to support massive connections. The existing problem for SCMA-OFDM system is that the peak-to-average power ratio (PAPR...

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Vydáno v:IEEE communications letters Ročník 22; číslo 10; s. 2156 - 2159
Hlavní autoři: Yang, Lin, Lin, Xubin, Ma, Xinying, Song, Kun
Médium: Journal Article
Jazyk:angličtina
Vydáno: New York IEEE 01.10.2018
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Témata:
Algorithms
AWGN
Bit error rate
clipping noise
Codes
Computer simulation
Decoding
Fiber optic networks
Mathematical model
Message passing
message passing algorithm (MPA)
Noise
Orthogonal Frequency Division Multiplexing
orthogonal frequency division multiplexing (OFDM)
Peak to average power ratio
peak-to-average power ratio (PAPR)
Performance degradation
Random noise
Simulation
Sparse code multiple access (SCMA)
Wireless networks
ISSN:1089-7798, 1558-2558
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Popis
Shrnutí:Sparse code multiple access combined with orthogonal frequency division multiplexing (SCMA-OFDM) is a promising wireless air-interface technology for fifth generation (5G) networks to support massive connections. The existing problem for SCMA-OFDM system is that the peak-to-average power ratio (PAPR) is unbearable high. The clipping method is often adopted to reduce the PAPR. However, the clipping brings extra noise to the SCMA-OFDM system. Due to the conventional message passing algorithm (C-MPA) didn't consider the clipping noise, it will cause the C-MPA decoding to be inaccurate and degrade the bit error rate performance. To tackle this issue, a novel clipping noise-aided MPA scheme, named CNA-MPA, which take both the additive white Gaussian noise (AWGN) and the clipping noise into consideration for decoding accurately is proposed. Simulation results show that the analysis of the clipping noise is accurate and the proposed CNA-MPA scheme leveraging both the AWGN and clipping noise can handle the phenomenon of the performance deterioration occurred in the C-MPA scheme at high E b /N 0 regime.
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ISSN:1089-7798
1558-2558
DOI:10.1109/LCOMM.2018.2864265