Sparse code multiple access (SCMA) is a novel multiple-access strategy used in 5G wireless networks that combines Orthogonal Frequency Division Multiple Access (OFDMA) and Code Division Multiple Access (CDMA). Recent interest in CDMA has been on the use of multi-level orthogonal coding to facilitate spreading. The orthogonal code is used to disseminate the modulated data symbols of each user. The set of spreading codes employed controls how much the signals interfere with each other, and thus impacts the system’s performance at the receiver. Grey Inverse Grey (GIG) orthogonal spreading codes are constructed in this study employing grey and inverse grey code, which provide higher correlation features than traditional binary code families such as Hadamard and gold code. This research assesses the Bit Error Rate (BER) performance of CDMA using the Binary Phase Shift Keying (BPSK) and Quadrature Phase Shift Keying (QPSK) modulation techniques. The performance of a DS-CDMA communication system is examined utilizing GIG orthogonal spreading codes in the Additive White Gaussian Noise (AWGN) and Rayleigh fading channels. The scrambling impact on GIG codes is also investigated. Under the same test settings, the results reveal that DS-CDMA systems using GIG spreading codes outperform binary spreading codes in terms of BER.
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