Effects of Codebook Design Weighting on Sparse Code Multiple Access System Performance

  • Shilvy Fatma Fitria Rachmawati Fatma Telecommunication Engineering Study Program, School of Electrical Engineering, Telkom University, Bandung, Jawa Barat 40287, Indonesia
  • Linda Meylani Telecommunication Engineering Study Program, School of Electrical Engineering, Telkom University, Bandung, Jawa Barat 40287, Indonesia
  • Vinsensius Sigit Widhi Prabowo Telecommunication Engineering Study Program, School of Electrical Engineering, Telkom University, Bandung, Jawa Barat 40287, Indonesia
DOI: https://doi.org/10.22146/jnteti.v13i2.9430
Keywords: Sparse Code Multiple Access, Codebook Design Weighting, Phase Rotation, Base Constellation, BER

Abstract

Sparse code multiple access (SCMA) can support the system when overloading on the receiving side, thereby improving the system’s spectral efficiency by designing mapping symbols appropriately. The performance of SCMA is assessed through the utilization of a sparse codebook, wherein bits are directly mapped to multidimensional codewords influenced by both the energy diversity and the minimum Euclidean distance of the multidimensional constellation (MC). The codebook design simulation was conducted using both Latin and non-Latin generators with phases of 60° and 45°, incorporating weighting values of w1 = 0.6; w2 = 0.3; w3 = 0.1. The simulation also included line constellation with additive white Gaussian noise (AWGN) channel, Rayleigh fading, and Rician channel. This study presented the optimal results across three channels: Latin 60° with BER 10−3 in the AWGN channel, non-Latin 60° with BER 10−3 in the Rayleigh fading, and non-Latin 45° with BER 10−3 in the Rician channel. Then, the results on the codebook design weighting were as follows: Latin 60° with BER 10−1 in the AWGN channel, non-Latin 45° with BER 10−1 in the Rayleigh fading, and Latin 45° with BER 10−3 in the Rician channel. The simulation results state the effect of weighting on each channel. It was found that Latin generators could improve BER performance by suppressing overlap at constellation points and eliminating errors occurred in SCMA codebooks. However, this improvement was observed only in AWGN channels and not for non-Latin generators.

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Published
2024-05-31
How to Cite
Fatma, S. F. F. R., Linda Meylani, & Vinsensius Sigit Widhi Prabowo. (2024). Effects of Codebook Design Weighting on Sparse Code Multiple Access System Performance. Jurnal Nasional Teknik Elektro Dan Teknologi Informasi, 13(2), 124-130. https://doi.org/10.22146/jnteti.v13i2.9430
Issue
Vol 13 No 2: May 2024
Section
Articles

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