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Abstract
Sparse Code Multiple Access (SCMA) is a multiplexing method that uses non-orthogonal codebook. This method increases the capacity of a wireless communication system. The method improves the efficiency as well. Therefore, this technique is considered to be an option to be used for the fifth generation-New Radio (5G-NR) communication systems. Also, polar codes have been a competitive candidate embraced by Enhanced Mobile Broadband (eMBB) since they achieve the maximum capacity limit known as Shannon’s capacity. In this thesis, the joint detection and decoding technique is introduced and investigated for possible use with the Sparse Code Multiple Access (SCMA) systems and with Polar codes as the channel codes. The proposed method shows a high improvement in the performance gain of the system compared to the method that uses separate detection and decoding technique. The proposed technique improves the likelihood of message detection and decoding by using less iterations. More precisely, the proposed joint detection and decoding method shows 3dB performance gain compared to the separate detection and decoding method when the code length is N = 256 and the code rate is R = ½. It also shows 1.5 dB performance gain for N = 1024 and R = 1/3. Increasing the number of iterations per each cycle is also investigated as well for both N = 256 and N = 1024. The proposed model that uses joint detection and decoding technique with polar codes shows that message detection and decoding performed faster compared to similar systems that use Turbo codes or LDPC codes.
