Indian Journal of Science and Technology

Abstract

Background/Objectives: Orthogonal Frequency Division Multiplexing (OFDM) is a very popular data transmission technique that can be easily applied in wire line or wireless data communication applications. But this OFDM system has several weaknesses; one of them is the complexity of OFDM system. This complexity problem can lead to the decreasing performance of OFDM when it is applied in real hardware. Methods/Statistical Analysis: In this paper, we investigate the performance of one of the most complex OFDM system, Multiple Input Multiple Output (MIMO) OFDM, with channel code and linear detector, and MIMO-OFDM without channel code and non-linear detector, to find which MIMO-OFDM system has lower complexity and decent performance. We calculate its complexity by analyzing how many mathematical operations needed to implement the system. Findings: The analytical and simulation results indicate that MIMO-OFDM with channel coding and linear detector has lower complexity than MIMO-OFDM with non-linear detector. Although the performance is slightly lower than the system with non-linear detector, the system with channel coding and linear detector is more suitable for hardware implementation. Application/Improvements: For future enhancement, this system needs to be applied in the real hardware system to analyze the performance further. 

Keywords: Complexity, Channel Estimation, Detector, MIMO, OFDM, Wireless Communication