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Title: Frequency domain characterization and performance bounds of ALMS loop for RF self-interference cancellation
Authors: Le, Anh Tuyen
Tran, Le Chung
Huang, Xiaojing
Guo, Y. Jay
Vardaxoglou, J.C.
Keywords: IBFD
Self-interference cancellation
ALMS loop
Frequency-domain analysis
Matched filter
Eigenvalue decomposition
Issue Date: 2018
Publisher: © IEEE
Citation: LE, A.T. ... et al, 2018. Frequency domain characterization and performance bounds of ALMS loop for RF self-interference cancellation. IEEE Transactions on Communications, doi: 10.1109/TCOMM.2018.2867514.
Abstract: Analog Least Mean Square (ALMS) loop is a promising method to cancel self-interference (SI) in in-band fullduplex (IBFD) systems. In this paper, the steady state analyses of the residual SI powers in both analog and digital domains are firstly derived. Eigenvalue decomposition is then utilized to investigate the frequency domain characteristics of the ALMS loop. Our frequency domain analyses prove that the ALMS loop has an effect of amplifying the frequency components of the residual SI at the edges of the signal spectrum in the analog domain. However, the matched filter in the receiver chain will reduce this effect, resulting in a significant improvement of the interference suppression ratio (ISR). It means that the SI will be significantly suppressed in the digital domain before information data detection. This paper also derives the lower bounds of ISRs given by the ALMS loop in both analog and digital domains. These lower bounds are joint effects of the loop gain, tap delay, number of taps, and transmitted signal properties. The discovered relationship among these parameters allows the flexibility in choosing appropriate parameters when designing the IBFD systems under given constraints.
Description: © 2018 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.
Sponsor: This work was supported by the Australian Research Council’s Discovery Project Funding Scheme (Project number DP160101693).
Version: Accepted for publication
DOI: 10.1109/tcomm.2018.2867514
URI: https://dspace.lboro.ac.uk/2134/36546
Publisher Link: https://doi.org/10.1109/tcomm.2018.2867514
ISSN: 0090-6778
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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