NDLI: Low Complexity 2D Adaptive Channel Estimation for OFDM Based Two-Way Relay Systems

Content Provider	IEEE Xplore Digital Library
Author	Joy, A. Chakka, V.K.
Copyright Year	2013
Description	Author affiliation: Dhirubhai Ambani Inst. of ICT, Gandhinagar, India (Chakka, V.K.) \|\| Albertian Inst. of Sci. & Technol., Cochin, India (Joy, A.)
Abstract	This paper introduces a low complexity adaptive channel estimation technique for OFDM based two-way relay systems. The adaptive filter used is known as Group Fast Array Multichannel 2D-Recursive Least Square (GFAM 2DRLS) filter. It has a computational complexity comparable to that of 2D-Normalized Least Mean Square (2D-NLMS) algorithm while maintaining the same convergence rate as the classic 2D Recursive Least Square (2D-RLS) algorithm. It considers the correlation of the channel frequency response in both time and frequency, while estimating the channel. In order to reduce the number of training data for time varying channel, the channel estimation is carried out based on the Decision Directed (DD) principle. It is assumed that the relay is capable of performing complex signal processing tasks. Hence the channel estimation is performed at the relay. Since the Channel State Information (CSI) is available at the relay, it could perform Multiple Input Multiple Output (MIMO) precoding of the transmitted data. Hence CSI is not required at the transmitting nodes. The convergence rate of GFAM 2D-RLS is compared with the existing 2D-NLMS algorithm and the computational complexity at each iteration is tabulated. Simulations are performed using MATLAB.
Starting Page	192
Ending Page	197
File Size	246875
Page Count	6
File Format	PDF
ISBN	9781479920105
DOI	10.1109/NGMAST.2013.42
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-09-25
Publisher Place	Czech Republic
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	OFDM Channel estimation Channel Estimation Two-way Relay Vectors Frequency response Adaptive filter Relays Computational complexity Convergence
Content Type	Text
Resource Type	Article

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