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Filtered OFDM Systems, Algorithms and Performance Analysis for 5G and Beyond

Zhang, Lei, Ijaz, Ayesha, Molu, Mehdi and Tafazolli, Rahim (2017) Filtered OFDM Systems, Algorithms and Performance Analysis for 5G and Beyond IEEE Transactions on Communications, 66 (3). pp. 1205-1218.

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Filtered orthogonal frequency division multiplexing (F-OFDM) system is a promising waveform for 5G and beyond to enable multi-service system and spectrum efficient network slicing. However, the performance for F-OFDM systems has not been systematically analyzed in literature. In this paper, we first establish a mathematical model for F-OFDM system and derive the conditions to achieve the interference-free one-tap channel equalization. In the practical cases (e.g., insufficient guard interval, asynchronous transmission, etc.), the analytical expressions for inter-symbol-interference (ISI), inter-carrier-interference (ICI) and adjacent-carrier-interference (ACI) are derived, where the last term is considered as one of the key factors for asynchronous transmissions. Based on the framework, an optimal power compensation matrix is derived to make all of the subcarriers having the same ergodic performance. Another key contribution of the paper is that we propose a multi-rate F-OFDM system to enable low complexity low cost communication scenarios such as narrow band Internet of Things (IoT), at the cost of generating intersubband- interference (ISubBI). Low computational complexity algorithms are proposed to cancel the ISubBI. The result shows that the derived analytical expressions match the simulation results, and the proposed ISubBI cancelation algorithms can significantly save the original F-OFDM complexity (up to 100 times) without significant performance loss.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering
Authors :
Date : 9 November 2017
DOI : 10.1109/TCOMM.2017.2771242
Copyright Disclaimer : © 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, 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 component of this work in other works
Uncontrolled Keywords : Filtered OFDM; Inter-subband-interference; Adjacent-carrier-interference; Asynchronous system; Multi-rate; waveform; Network slicing; NB-IoT
Depositing User : Clive Harris
Date Deposited : 08 Nov 2017 13:54
Last Modified : 16 Jan 2019 19:04

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