Title: Performance enhancement of MIMO-OFDM using hybrid equalisers-based ICI mitigation with channel estimation in time varying channels

Authors: Madhavi Latha Pandala; Samanthapudi Swathi; Abdul Hussain Sharief; Suresh Penchala; Ganga Rama Koteswara Rao; Pala Mahesh Kumar

Addresses: Department of Information Technology, V R Siddhartha Engineering College, Vijayawada, Andhra Pradesh, India ' Department of Electronics and Communication Engineering, Sagi Rama Krishnam Raju Engineering College, Bhimavaram, Andhra Pradesh, India ' Department of Electronics and Communication Engineering, Dhanekula Institute of Engineering and Technology, Vijayawada, Andhra Pradesh, India ' Department of Electronics and Communication Engineering, Kamala Institute of Technology and Science, Singapur, Huzurabad, Telangana, India ' Department of Computer Science and Information Technology, Koneru Lakshmaiah Education Foundation, Vaddeswaram, Guntur, Andhra Pradesh, India ' Department of Artificial Intelligence, SAK Informatics, Hyderabad, Telangana, India

Abstract: High spectrum efficiency and resistance to interferences make Multiple-Input-Multiple-Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) an exceptionally good choice for the realisation of Long-Term Evaluation-Advanced (LTE-A). Thus, here in this article, both time variant training and time invariant Channel Estimation (CE) are suggested in MIMO-OFDM. Further, combination of three equalisation techniques named as ZF-MMSE-SIC is presented for improving the possessions of BER and ICI in MIMO-OFDM system, where zero forcing (ZF) is utilised for time variant CE, Minimum Mean Square Error (MMSE) is employed for time invariant CE schemes. Successive Interference Cancellation (SIC) is utilised to reduce the ICI further to minimum level by enhancing the Carrier-to-Interference Ratio (CIR). Extensive simulations revealed that proposed hybrid methodology performed better than conventional ICI mitigation algorithms over different time varying channels while improving the performance of both BER and spectral efficiency.

Keywords: MIMO-OFDM; ICI cancellation; zero-forcing; minimum mean square error; carrier-to-interference ratio; successive interference cancelation.

DOI: 10.1504/IJGUC.2023.135327

International Journal of Grid and Utility Computing, 2023 Vol.14 No.6, pp.644 - 653

Received: 12 Jul 2022
Received in revised form: 27 Sep 2022
Accepted: 12 Oct 2022
Published online: 05 Dec 2023 *

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