Secured Voice Frequency Signal Transmission in 5G Compatible Multiuser Downlink MIMO NOMA Wireless Communication System
Md. Humaun Kabir, Jinia Rahman, Shaikh Enayet Ullah · International Journal of Networks and Communications · 2018
In this paper, we investigate the performance of 2×2 multi antenna configured NOMA wireless communication system. The simulated system under investigation incorporates various types of channel coding schemes (LDPC, (3, 2) SPC and Repeat and Accumulate) and two types of low order modulation techniques (QPSK and QAM). We propose an improved ML decoding based QR channel factorization aided SIC (QR-SIC) technique and it is implemented on encrypted audio signal transmission in a hostile fading channel. Numerical simulation results show that the presently considered simulated system is very much robust and effective in retrieving audio signal under utilization of Repeat and Accumulate channel coding and QAM digital modulation techniques.