Journal
IEEE COMMUNICATIONS LETTERS
Volume 21, Issue 12, Pages 2578-2581Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LCOMM.2017.2754262
Keywords
Sparse superposition codes; spatial coupling; generalized approximate message passing; clipping; potential function analysis
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Funding
- University Grants Committee of the Hong Kong Special Administrative Region, China [AoE/E-02/08, CityU 11217515, CityU 11280216]
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Gaussian signaling of spatially coupled sparse superposition codes incurs a high peak-to-average-power ratio (PAPR) problem. Clipping can be used to reduce PAPR. At the receiver side, generalized approximate message passing algorithm is employed to handle the non-linear clipping distortion. Surprisingly, we observe empirically that clipping can improve the performance in low-to-medium rate region. We provide an explanation of this observation based on potential function analysis.
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