NEW COMPUTER GENERATED-SCMA CODEBOOK WITH MAXIMIZED EUCLIDIAN DISTANCE FOR 5G

Abstract

Sparse Code Multiple Access (SCMA) is one of the Non- Orthogonal Multiple Access (NOMA) thatattracts many researchers for its promising future uses in 5G systems. In this paper, a Computer Generated-Sparse Code Multiple Access (CG-SCMA) is proposed. CG- SCMA generates a complex SCMA codebook thatmaximizes the Minimum Euclidian Distance (MinED) of 16- point star-Quadrature Amplitude Modulation (QAM).This codebook is generated using computer program to specify the most appropriate values for this constellation,followed by Trellis Coded Modulation(TCM) which is used to divide the constellation into four sub constellations tomaximize MinED. The new codebook reaches MinED equal to 3.46, 2.16, 2.16, 3.46 for the four sub constellationssequentially. This achieves increment over SCMA codebook based on 16- point star-QAM by 10.1%. The multiplexerand de-multiplexer of both proposed codebook and traditional SCAM codebook is hardware implemented by FieldProgrammable Gate Array(FPGA)using netFPGA- 1G- CML Kintex-7. The achievements of this work is speedingup the process by 597.6 times over MATLAB simulator and decrease Bit Error Rate(BER) compared to openliterature codebooks.