NDLI: A fast and efficient adaptive channel equalizer for OFDM-based wireless relay system

Content Provider	IEEE Xplore Digital Library
Author	Asharif, F. Tamaki, S. Alsharif, M.R. Heung GyoonRyu
Copyright Year	2011
Description	Author affiliation: Department of Electronic Engineering, Chungbuk National University, Korea 361-763 (Heung GyoonRyu) \|\| University of the Ryukyus Graduate School of Science and Engineering (Asharif, F.) \|\| University of the Ryukyus Faculty of Engineering Department of Information Engineering (Tamaki, S.; Alsharif, M.R.)
Abstract	Summary In this paper, we aim to eliminate the interference signals for a novel wireless communication repeater based on OFDM. The wireless repeater in communication system is important especially for mobile system. Now these days, in order to amplify the signal via repeater, receiver and transmitter of repeater using only one frequency without frequency shift. However, in this case repeater has problem that, amplified signal will feedback to receiver sides and this may cause the internal instability and distortion of repeater system. Therefore, by estimating the feedback signal by adaptive filter, we can eliminate the effects of feedback signal. In this paper we consider LMS, NLMS and RLS algorithms in order to estimate the feedback signal. Furthermore, by these adaptive filters we identify the unknown channel and evaluate the performance of each algorithm by MSE. Here, the LMS does not work and RLS has the best performance comparing to NLMS for identification of the unknown multi path channel. In repeater, the amplified signal not only transmitted to the user but also transmitted to receiver side of repeater by multipath feedback channel [1]. Therefore, in the receiver side of repeater, it will receive reference signal from base station which is ideal input of repeater and the other is feedback signal from repeaters transmitter side which is amplified. Therefore, repeater receives the interference from transmitter side. In this case, repeater system may unstable due to positive feedback. Thus, the interference cancellation system is required in order to cancel the interference signal in receiver side of repeater. In this paper, multipath channel exists in feedback channel and identify the unknown channel by adaptive filter such as LMS, NLMS and RLS. The point of this research is the fast identification of unknown channel due to rapid changing communication channel. Then, we evaluate the performance of each adaptive filter. The Channel equalizer for repeater is shown as follows
Starting Page	1
Ending Page	1
File Size	124753
Page Count	1
File Format	PDF
ISBN	9781457701627
ISSN	19345070
e-ISBN	9781457701610
DOI	10.1109/WTS.2011.5960896
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-04-13
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Wireless communication Equalizers OFDM Adaptive filters Receivers Repeaters Least squares approximation
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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