International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 10 Issue: 04 | Apr 2023
p-ISSN: 2395-0072
www.irjet.net
MIMO-OFDM WIRELESS COMMUNICATION SYSTEM PERFORMANCE ANALYSIS FOR CHANNEL ESTIMATION: A REVIEW Sanjay Kumar1, Mr. Pradeep Pal2 1M.Tech, Electronic and Communication Engineering, GITM, Lucknow, India
2Assistant Professor Electronic and Communication Engineering, GITM, Lucknow, India
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Abstract - MIMO-OFDM (Multiple Input Multiple Output
With the widespread adoption of mobile devices and the growing demand for mobile data services, mobile communication systems have become an integral part of modern society, enabling people to stay connected with each other and the world around them at all times.
Orthogonal Frequency Division Multiplexing) is a wireless communication technology that combines two advanced techniques: Multiple Input Multiple Output (MIMO) and Orthogonal Frequency Division Multiplexing (OFDM). MIMO technology involves using multiple antennas at both the transmitter and receiver ends to improve the overall performance and capacity of the wireless communication system. By using multiple antennas, MIMO can increase the data rate, reduce interference, and improve the range of the wireless link. OFDM is a digital multi-carrier modulation technique that divides the available bandwidth into multiple orthogonal subcarriers. Each subcarrier carries a portion of the data, and the subcarriers are modulated and transmitted simultaneously. This makes OFDM an effective technique for mitigating the effects of multipath fading and interference in wireless communication systems. MIMO-OFDM is widely used in many wireless communication systems, such as 4G LTE, WiFi, and WiMAX, to provide high-speed and reliable wireless communication. It provides several advantages, including increased data rate, improved spectral efficiency, enhanced reliability, and improved resistance to fading and interference, compared to traditional single-antenna and single-carrier communication systems.
1.1. MIMO-OFDM Multiple Input Multiple Output (MIMO) is a wireless communication technology that involves using multiple antennas at both the transmitter and receiver ends of a wireless link. The goal of MIMO is to improve the performance and capacity of wireless communication systems. In MIMO systems, multiple antennas are used at both the transmitting and receiving ends to simultaneously transmit and receive multiple data streams. This allows the system to effectively exploit the spatial diversity of the wireless channel, resulting in increased data rates, reduced interference, and improved link range. MIMO technology can be applied in both single-user and multi-user scenarios, and it is widely used in many wireless communication systems, such as 4G LTE, Wi-Fi, and WiMAX, to provide high-speed and reliable wireless communication. MIMO can be implemented in different configurations, such as spatial multiplexing, beamforming, and diversity combining. The choice of MIMO configuration depends on the specific requirements and constraints of the wireless communication system. Overall, MIMO is a key technology for improving the performance and capacity of wireless communication systems, and it will continue to play an important role in the development of future wireless communication systems.
Key Words:
MIMO-OFDM, Channel Estimation, Pilot carriers, Minimum Mean square error.
1. INTRODUCTION Mobile communication systems are wireless communication networks that provide communication services to mobile devices, such as smartphones, tablets, and laptops. These systems allow users to communicate with each other and with the outside world, regardless of their physical location. Mobile communication systems typically consist of a network of base stations, each with a defined coverage area, and mobile devices that are used by the users to communicate. The base stations are connected to the core network, which provides the necessary infrastructure and services to support communication between mobile devices. Mobile communication systems use a variety of technologies and standards, including cellular networks, Wi-Fi, and satellite communication, to provide a range of communication services, such as voice, text, and multimedia messaging, as well as high-speed data services.
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Orthogonal Frequency Division Multiplexing (OFDM) is a digital multi-carrier modulation technique used in wireless communication systems. It divides the available bandwidth into multiple orthogonal subcarriers, each of which carries a portion of the data. The subcarriers are modulated and transmitted simultaneously, and the data is reconstructed at the receiver. The main advantage of OFDM is its ability to effectively combat the effects of multipath fading and interference in wireless communication systems. By dividing the available bandwidth into multiple subcarriers, each with a relatively narrow bandwidth, OFDM can mitigate the effects of fading and interference by spreading the data over multiple subcarriers. OFDM is widely used in many wireless communication systems, such as 4G LTE, Wi-Fi, and Digital
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