Investigation of Rayleigh and Rician fading channels for state of the art (SOA) LTE-OFDM communication system

Abstract

Some of the major difficulties for State of the Art (SOA) Long Term Evolution (LTE) system are the requirements of higher bit rate and improved Quality of Service (QoS). Bandwidth limitation and varying nature of wireless channel are needed to be investigated during the development of a new generation wireless system. LTE has adopted adaptive technologies starting from Orthogonal Frequency Division Multiplexing (OFDM) to ‘dynamic channel estimation and equalization’ in order to counteract the dynamic and dubious nature of a fading channel. Rician K-factor and RMS Delay Spread (RDS) are two main parameters those characterize a multipath fading channel. Particularly Rayleigh and Rician fading channels can be characterized by K-factors and RDS. Rician-K and RDS of a multipath fading channel can be controlled through different parameters, one of them is the beamwidth of used antenna system. Effects of antenna beamwidth, RDS, Rician-K and other channel parameters on LTE-OFDM channels are investigated and presented in this paper through theoretical analysis and simulations of channel models.