Performance Analysis Of MIMO-OFDM Under Fading Channels

Abstract

The advancement of wireless communication has 
ushered in the era of fourth-generation (4G) 
systems, characterized by their reliance on 
sophisticated techniques like Multiple Input 
Multiple 
Output (MIMO) and Orthogonal 
Frequency Division Multiplexing (OFDM). This 
paper focuses on the synergistic integration of 
these two technologies to create an enhanced 
communication framework known as the OFDM
MIMO system. This system is particularly 
renowned for its ability to significantly improve 
capacity and data rates, making it a cornerstone of 
modern wireless networks.

In this study, we investigate the Bit Error Rate 
(BER) performance of both traditional OFDM and 
the OFDM-MIMO system. A crucial aspect of our 
approach involves employing convolutional 
coding, a technique designed to encrypt and 
protect the data stream during transmission over 
varying communication channels. To thoroughly 
evaluate the performance of these systems, we 
conducted 
simulations 
using 
MATLAB, 
incorporating three distinct types of channels: 
Additive White Gaussian Noise (AWGN), Rician 
fading. The simulation results reveal a marked 
improvement in performance for the OFDM
MIMO system compared to the traditional OFDM 
system, underscoring the benefits of integrating 
MIMO technology. 
Furthermore, the practical aspect of our research 
was executed using two Universal Software Radio 
Peripheral B210 (USRP B210) devices. This 
involved a hands-on experiment where we utilized 

two antennas for simultaneous transmission and 
reception. The results demonstrated that the 
transmitted signals were successfully recovered, 
validating the effectiveness of the OFDM- MIMO 
system in real-world scenarios. 
This research not only contributes to the academic 
understanding 
of 
advanced 
wireless 
communication techniques but also provides 
valuable insights for future developments in high- 
capacity, reliable communication systems