Performance Evaluation of Downlink Power Domain Non-orthogonal Multiple Access over Rayleigh Channel

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Addis Ababa University


Abstract In the future demand or number of mobile user for wireless service become very large, eventually the number of channels assigned to each cell will be insufficient to support the required number of users. And as its obvious spectrum is a very scares and limited resource, so that our country or any other countries can’t use the resource as they want which direct the mobile communication unsustainable in system capacity/ efficiency and quality of user experience. In order to continue to guarantee the sustainability of mobile communication services over the following decade, new technology solutions that can answer to future challenges need to be recognized and developed. Non-orthogonal multiple access (NOMA) is one of radio access techniques for performance enhancement in next-generation cellular communications. It’s imperative to evaluate the performance of NOMA under Rayleigh fading channel. Multipath fading is a challenging channel for wireless communication and in the presence of Rayleigh fading channel it can cause drastic increase in either signal outage probability or average BER. Therefore this thesis uses outage probability and BER performance measurement matrix to evaluate downlink NOMA taking advantage of power domain user multiplexing scheme that utilizes superposition coding (SC) at the transmitter, successive interference cancellation (SIC) applied at the receiver and integrated with multiple-input multiple-output (MIMO) for future radio access. Implementation of MIMO over NOMA and evaluate the impacts of Rayleigh fading channel on NOMA is done through simulation using Matlab simulation. From the simulation result the performance of NOMA is better than OFDMA in terms of BER reduction and for higher SNR value NOMA achieve acceptable performance based on both matrixes, therefore it’s recommended to implement for future radio access.



Non-orthogonal multiple access (NOMA), Power domain NOMA, Superposition coding (SC), Successive interference cancellation (SIC), Multiple-input Multiple-output (MIMO), NOMA performance, Bit error rate (BER), Outage probability