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Performance Analysis and Optimization of DCT-Based Multicarrier System on Frequency-Selective Fading Channels

He, Chang, Zhang, Lei, Mao, Juquan, Cao, Aijun, Xiao, Pei and Imran, Muhammad (2018) Performance Analysis and Optimization of DCT-Based Multicarrier System on Frequency-Selective Fading Channels IEEE Access.

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Regarded as one of the most promising transmission techniques for future wireless communications, the discrete cosine transform (DCT) based multicarrier modulation (MCM) system employs cosine basis as orthogonal functions for real-modulated symbols multiplexing, by which the minimum orthogonal frequency spacing can be reduced by half compared to discrete Fourier transform (DFT) based one. With a time-reversed prefilter employed at the front of the receiver, interference-free one-tap equalization is achievable for the DCT-based systems. However, due to the correlated pre-filtering operation in time domain, the signal-to-noise ratio (SNR) is enhanced as a result at the output. This leads to reformulated detection criterion to compensate for such filtering effect, rendering minimum-meansquare- error (MMSE) and maximum likelihood (ML) detections applicable to the DCT-based multicarrier system. In this paper, following on the pre-filtering based DCT-MCM model that build in the literature work, we extend the overall system by considering both transceiver perfections and imperfections, where frequency offset, time offset and insufficient guard sequence are included. In the presence of those imperfection errors, the DCTMCM systems are analysed in terms of desired signal power, inter-carrier interference (ICI) and inter-symbol interference (ISI). Thereafter, new detection algorithms based on zero forcing (ZF) iterative results are proposed to mitigate the imperfection effect. Numerical results show that the theoretical analysis match the simulation results, and the proposed iterative detection algorithms are able to improve the overall system performance significantly.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering
Authors :
Date : 14 February 2018
Identification Number : 10.1109/ACCESS.2018.2806318
Copyright Disclaimer : Copyright 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
Uncontrolled Keywords : Discrete cosine transform (DCT), fading channels, intercarrier interference (ICI), performance optimization
Depositing User : Melanie Hughes
Date Deposited : 09 Feb 2018 09:28
Last Modified : 07 Mar 2018 12:17

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