Performance Analysis of MIMO-OFDM By Spatial Diversity With STBC4

Abstract

MIMO-OFDM (multiple input multiple output- orthogonal frequency division multiplexing), a new wireless broadband technology, has gained great popularity for its capability of high rate transmission and its robust- ness against multi-path fading and other channel impairments.OFDM is a type of multichannel modulation that converts a frequency-selective fading channel into a collection of parallel flat fading sub channels, which greatly simplifies the structure of receiver. In this paper, a simulation model of MIMO-OFDM system based on STBC4 (Space Time Block Codes) is built using MATLAB. BER (Bit Error Rate) performance of the system with different number of antenna configuration like 4X1, 4X2, 4X3, 4X4 with OFDM are analyzed and simulated under Rayleigh Channel considering different modulation levels of M-PSK (Phase Sift Keying) such as 32-PSK, 64-PSK, 128-PSK, 256-PSK, 512-PSK and 1024-PSK. Along with the variations in modulation levels channel encoding code rate is also being varied viz. 1/2, 2/3 and 3/4.