NDLI: BEM-Based Reconstruction of Time-Varying Sparse Channel in OFDM Systems

Content Provider	IEEE Xplore Digital Library
Author	Fei Qi Yanhong Ju Songlin Sun Xiaojun Jing Yueming Lu
Copyright Year	2013
Description	Author affiliation: Key Lab. of Trustworthy Distrib. Comput. & Service, Beijing Univ. of Posts & Telecommun., Beijing, China (Fei Qi; Yanhong Ju; Songlin Sun; Xiaojun Jing; Yueming Lu)
Abstract	In this paper, we propose a pilot-aided channel estimation scheme for Orthogonal Frequency-Division Multiplexing (OFDM) systems where channels are assumed to be both time-varying and sparse. Basis Expansion Models (BEM) are often used to model and reconstruct time-varying channel taps. In this paper, the framework of BEM is applied to OFDM systems with time-varying sparse channels. A new method to detect the positions of significant taps is proposed based on the use of Constant Amplitude Zero Auto Correlation (CAZAC) sequence. Based on the results of detection, BEM based estimation is implemented to estimate the detected taps. The numerical simulations illustrate that the proposed two-step estimation scheme for significant channel taps outperforms direct estimation methods for all the channel taps and also this method can reduce the required pilots and thus reduce the computational load and improve the spectral efficiency.
Starting Page	1
Ending Page	5
File Size	353435
Page Count	5
File Format	PDF
ISBN	9781467361873
ISSN	10903038
DOI	10.1109/VTCFall.2013.6692115
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-09-02
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Channel estimation OFDM Estimation Time-varying channels Receivers Time-domain analysis Doppler effect
Content Type	Text
Resource Type	Article

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