Hybrid AFDF Cooperative Communication Technique For MIMO-NOMA

Abstract

Wireless communication is fastest growing industry as it provides access to users located anywhere in the world through just one click. Internet and cellular phone are basic requirement of every individual now and they demand high data rates, low latency, high accuracy, better quality of service and much more. These demands raise challenges in wireless communication system because signal is travelling through medium where signal quality is tarnished by haphazard fades, diffractions and various other performance degrading phenomenon. To meet the demands, we need technological advancements, so we can alleviate these challenges. NOMA is emerging technique of 5G that ensures better performance than traditional multiple access techniques. In a typical NOMA system, users individually communicate with base station and treat any other user signal as noise. Here the important point be noted that NOMA near (Strong) users have information of all far (weak). users. In this thesis, we introduced cooperative communication over strong user to improve performance of weak user in cellular system. MultiUser NOMA with cooperative communication was implemented over AWGN channel and analyzed. We basically exploited the crux of NOMA that states that strong user has prior knowledge of weak user with bad channel condition. Strong user was used as relay to improve performance of weak user via cooperative communication. The above scheme was implemented for both SISO NOMA system and MIMO NOMA system. BER Curves analyses proved that performance of weak user laying over the edge in cellular system can be improved via cooperative communication.