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Filtered OFDM: An Insight into Intrinsic In-Band Interference and Filter Frequency Response Selectivity

Mao, Juquan, Zhang, Lei, Xiao, Pei and Nikitopoulos, Konstantinos (2020) Filtered OFDM: An Insight into Intrinsic In-Band Interference and Filter Frequency Response Selectivity IEEE Access, 8.

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The future mobile networks will face challenges in support of heterogeneous services over a unified physical layer, calling for a waveform with good frequency localization. Filtered orthogonal frequency division multiplexing (f-OFDM), as a representative subband filtered waveform, can be employed to improve the spectrum localization of orthogonal frequency-division multiplexing (OFDM) signal. However, the applied filtering operations will impact the performance in various aspects, especially for narrow subband cases. Unlike existing studies which mainly focus its benefits, this paper investigates two negative consequences inflicted on single subband f-OFDM systems: in-band interference and filter frequency response (FFR) selectivity. The exact-form expression for the in-band interference is derived, and the effect of FFR selectivity is analyzed for both single antenna and multiple antenna cases. The in-band interference-free and nearly-free conditions for f-OFDM systems are studied. A low-complexity blockwise parallel interference cancellation (BwPIC) algorithm and a pre-equalizer are proposed to tackle the two issues caused by the filtering operations, respectively. Numerical results show that narrower subbands suffer more performance degradation compared to wider bands. In addition, the proposed BwPIC algorithm effectively suppresses interference, and pre-equalized f-OFDM (pf-OFDM) considerably outperforms f- OFDM in both single antenna and multi-antenna systems.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering
Authors :
Zhang, Lei
Date : 25 May 2020
Funders : EPSRC, University of Surrey 5GIC
DOI : 10.1109/ACCESS.2020.2997316
OA Location :
Grant Title : EPSRC Grant
Copyright Disclaimer : This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see
Uncontrolled Keywords : filtered OFDM, frequency response selectivity, in-band interference, interference cancellation
Depositing User : James Marshall
Date Deposited : 11 Jun 2020 14:59
Last Modified : 11 Jun 2020 15:07

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