Analysis the Performance of OFDM-MIMO Channel with Different Equalizers
Published: 2022
Author(s) Name: Diponkor Bala, Md. Shamim Hossain, Md. Ibrahim Abdullah and Mohammad Alamgir Hossain |
Author(s) Affiliation: Department of Computer Science and Engineering, Islamic University, Kushtia, Bangladesh.
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Abstract
The excellent efficiency, capacity, and dependability of todays wireless networks are concurrent to be achieved, and employing several communication methods antennas is an effective solution that has been extensively used. A communication system where both terminals are equipped with multi-antennas are referred to as MIMO systems, and when combined with OFDM technology are referred to as MIMO-OFDM. MIMO-OFDM has the ability to serve a large number of users with an enormous data transmission speed communication as well as utilizing the bandwidth efficiently. The aim of this simulation task explores three different equalization schemes in the MIMO flat fading channel, frequency-selective OFDM channel, and combined OFDM-MIMO wireless links on the bit error rate (BER) metric. Throughout the simulations, we modulate in 4-QAM (MIMO, OFDM-MIMO) and 16-QAM (OFDM) and observe BER performances for signal-to-noise ratio (SNR) up to 30. We find that given the specifications for OFDM as defined in IEEE 802.11a, precoding, and zero-forcing schemes in MIMO yield similar BER performances, while the MMSE scheme performs slightly worse at higher SNRs. Based on the equalization scheme, we assume perfect channel state information at the transmitter (CSIT) (for precoding) and the receiver (CSIR) (for zero-forcing and MMSE).
Keywords: CSIR, CSIT, Equalization, MIMO, OFDM, OFDM-MIMO.
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