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Title: RLS-based joint estimation and tracking of channel response, sampling, and carrier frequency offsets for OFDM
Authors: Nguyen-Le, H.
Le-Ngoc, T.
Ko, C.C. 
Keywords: Carrier frequency offset
Channel impulse response
Inter-carrier interference (ICI)
Joint channel estimation and synchronization
Orthogonal frequency division multiplexing (OFDM)
Recursive least square (RLS) algorithm
Sampling frequency offset
Issue Date: Mar-2009
Citation: Nguyen-Le, H., Le-Ngoc, T., Ko, C.C. (2009-03). RLS-based joint estimation and tracking of channel response, sampling, and carrier frequency offsets for OFDM. IEEE Transactions on Broadcasting 55 (1) : 84-94. ScholarBank@NUS Repository.
Abstract: This paper proposes a pilot-aided joint channel estimation and synchronization scheme for burst-mode orthogonal frequency division multiplexing (OFDM) systems. Based on the received signal samples containing pilot tones in the frequency domain, a cost function that includes the carrier frequency offset (CFO), sampling clock frequency offset (SFO) and channel impulse response (CIR) coefficients is formulated and used to develop an accompanying recursive least-squares (RLS) estimation and tracking algorithm. By estimating the channel CIR coefficients instead of the channel frequency response in the frequency domain, the proposed scheme eliminates the need for an IFFT block while reducing the number of parameters to be estimated, leading to lower complexity without sacrificing performance and convergence speed. Furthermore, a simple maximum-likelihood (ML) scheme based on the use of two long training symbols (in the preamble) is developed for the coarse estimation of the initial CFO and SFO to suppress dominant ICI effects introduced by CFO and SFO and to enhance the performance and convergence of the fine RLS estimation and tracking. Simulation results demonstrate that, over large ranges of CFO and SFO values, the proposed pilot-aided joint channel estimation and synchronization scheme provides a receiver performance that is remarkably close to the ideal case of perfect channel estimation and synchronization in both AWGN and Rayleigh multipath fading channels. © 2006 IEEE.
Source Title: IEEE Transactions on Broadcasting
ISSN: 00189316
DOI: 10.1109/TBC.2008.2012361
Appears in Collections:Staff Publications

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