Performance of MIMO and Massive MIMO Systems in TWDP Fading Channel

Abstract

Current wireless scenario where directional antennas , wide band signals and narrow band receivers are commonly deployed , give rise to environment which is correctly represented by TWDP (Two Wave Diffuse Power) Fading model other than Rayleigh or Rician Model . TWDP fading has two LOS components in the presence of other diffusely propagating waves. Research shows that when two LOS components are equal in strength and opposite in phase, TWDP fading makes a link which is even poorer than made by Rayleigh Fading. Hence, TWDP fading model should be used to design worst case wireless communication scenario. Wireless communication systems uses multiple antennas at the transmitter as well as receiver to enhance data rate, throughput, and energy and power efficiency. These systems commonly known as MIMO are employed almost everywhere. The power of MIMO is that it has resilience to combat fading and uses random fading, scattering and multipath propagation in its benefit to enhance capacity. Hence, more faded the environment is more is the capacity that is achieved by MIMO system. TWDP fading scenario which is worst in its properties gives best environment to MIMO and much higher capacity is attained. Also Massive MIMO system which offers many benefits over MIMO systems such as improved data rate, increased directivity , reduced latency due to more degree of freedom when compared in all fading scenario’s gives best results for capacity in TWDP fading environment. The objective of this research work is to analyze the performance of MIMO and Massive MIMO systems in TWDP channel. Upper and Lower Bound of capacity is derived for MIMO system in TWDP fading channel. Performance of Spatially Modulated System which improves BER (Bit error Rate) is studied in TWDP channel.