Parametric Analysis of SCMA Performance with Different Codebooks and Orthogonal Resources

Non Orthogonal Multiple Access is a key technology for 5G as it accommodates more users, which is a future wireless technology requirement. It also improves system spectral efficiency. Sparce code multiple access (SCMA) is a scheme of Code Domain NOMA. Selection of appropriate codebook and number of orthogonal resources are the key factors for SCMA scheme. This paper aims to demonstrate SCMA performance analysis in terms of bit error rate using different codebooks and orthogonal resources. Using Non-AWGN and AWGN channels, performance over different codebooks is evaluated. All codebooks for different orthogonal resources are simulated in MATLAB. From simulation results, we achieved better results for codebook2 under AWGN channel when orthogonal resources are equal to number of codewords in codebook. Performance of codebook1 give approximately same results as codebook4. In this paper, we achieved better results for different codebooks and orthogonal resources. When orthogonal resources are equal to code words, it give better results as overloading factor is high. Using different codebooks, codebook2 for SCMA system give better results using four orthogonal resources. Overloading factor for four orthogonal resources is 150 which is better than using five orthogonal resources having 120 overloading factor.