Authors: K. Vidhya
Addresses: Department of ECE, Sri Ramakrishna Engineering College, Coimbatore-22, India
Abstract: Orthogonal frequency division multiplexing (OFDM) is one of the new modulation techniques which is used to combat the frequency-selectivity of the transmission channel models achieving high data rate without inter-symbol interference. OFDM may be combined with antenna arrays at the transmitter and receiver to increase the system capacity on time-variant and frequency-selective channel models resulting in a multiple-input multiple-output (MIMO) configuration. In this paper, SISO, SIMO, MISO and MIMO-OFDM configurations of OFDM systems are proposed. LS channel estimator is used to calculate the channel coefficients. The four different OFDM systems are analysed and simulated. The simulation consists of four parameters namely bit error rate, mean square error, symbol error rate and capacity of the channel for MIMO-OFDM systems. The error rate values are minimised in 2×2 MIMO-OFDM systems compared to other 1×1, 1×2, 2×1 OFDM systems. Similarly channel capacity is maximised in 2×2 MIMO-OFDM systems, compared to the other OFDM systems. These performances are implemented using MATLAB software.
Keywords: multiple input multiple output; MIMO; OFDM systems; single input single output; SISO; single input multiple output; SIMO.
International Journal of Operational Research, 2020 Vol.37 No.2, pp.293 - 306
Received: 12 Jan 2017
Accepted: 16 Mar 2017
Published online: 20 Feb 2020 *