Analysis of MIMO-OFDM: Effect of Mutual Coupling, Frequency Response, SNR and Channel Capacity Karthik Kumar Vaigandla 1* , RadhaKrishna Karne 2 , Allanki Sanyasi Rao 3 1 Assistant Professor, 2 Assistant Professor, 3 Associate Professor 1,2,3 Balaji Institute of Technology and Science, Dept. of Electronics & Communication Engineering, Warangal, Telangana, India 1 vkvaigandla@bitswgl.ac.in, 2 krk.wgl@gmail.com , 3 asr.balajigroup@gmail.com ABSTRACT- Systematic analysis of systems with Multiple Inputs and Multiple Outputs (MIMO) is presented in this paper. MIMO systems and various techniques for decoupling are discussed, including their effect on performance. As wireless communications systems progress, the challenge is to deliver high-data-rate access with good quality of service (QOS). MIMO technology can also offer greater reliability by boosting the link due to increased spectral efficiency; this can be met by incorporating spatial multiplexing gains and antenna diversity gains. OFDM signals can be used with antenna arrays at both transmitter and receiver for maximum efficiency. As a result, we have MIMO-OFDM. A generalized predictive control for MIMO systems is considered in this paper. Stability and performance of the closed-loop system are measured by using frequency response indicators. Keywords: Multiple Inputs and Multiple Output (MIMO), Orthogonal Frequency Division Multiplexing (OFDM), BER, high data rate, Mutual coupling (MC), channel capacity. 1. INTRODUCTION Wireless communication nowadays requires a high level of speed and throughput. Wireless communications have grown in popularity since high-speed wired communications became popular decades ago. Most wireless networks communicate downlink using OFDM. Adaptable channels make them ideal for use with difficult channels. The use of OFDM for 4G communications is a great choice. However, OFDM's PAPR is its main disadvantage. There are several methods for reducing the PAPR [21]. Wireless communication has been revolutionized by MIMO technology, which increases transmission capacity without requiring significantly higher antenna power [1]. MIMO technology uses multiple antennas to transmit and receive data in a wireless system. In the past few decades, MIMO has gained widespread popularity because of its performance-enhancing capabilities [2]. Using MIMO systems, both the transmitter and the receiver take advantage of space (or antenna) diversity in order to increase the spectral efficiency. Multiple data streams can be transmitted simultaneously by MIMO systems, improving capacity [3]. Massive MIMO is widely used in modern telecommunications, including long-term evolution (LTE) and wireless local area networks (WLAN) [4]. It is considered a key enabler for fifth- generation (5G) communications [5] - The massive MIMO system is believed to be a key YMER // ISSN : 0044-0477 VOLUME 20 : ISSUE 10 (Oct) - 2021 http://ymerdigital.com Page No:118