2018/03/14 by Duc‐Dung Tran, Tran, Duc-Dung, Ha-Vu Tran +5
Engineering · Biochemistry, Genetics and Molecular Biology · #Advanced Wireless Communication Technologies #Optical Wireless Communication Technologies #Advanced biosensing and bioanalysis techniques
paper · pdf · doi:10.48550/arxiv.1803.10258
This paper proposes a new communication protocol for a cooperative\nnon-orthogonal multiple access (NOMA) system. In this system, based on users'\nchannel conditions, each two NOMA users are paired to reduce system complexity.\nIn this concern, the user with a better channel condition decodes and then\nforwards messages received from the source to the user with a worse channel\ncondition. In particular, the direct link between the paired users is assumed\nto be unavailable due to the weak transmission conditions. To overcome this\nissue, we propose a new cooperative NOMA protocol in which an\namplify-and-forward (AF) relay is employed to help the user-to-user\ncommunications. To evaluate the proposed protocol, the exact closed-form\nexpressions of outage probability (OP) at the two paired users are derived.\nBased on the analysis of the OP, we further examine the system throughput in a\ndelay-sensitive transmission mode. Finally, our analytical results verified by\nMonte-Carlo simulation show that the proposed protocol is efficient in\nenhancing the performance of NOMA system when the user-to-user communications\nis limited.\n