Finite High Order Approximation Algorithm for Joint Frequency Tracking and Channel Estimation in OFDM Systems

Rainfield Y. YEN  Hong-Yu LIU  Chia-Sheng TSAI  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E95-A   No.10   pp.1676-1682
Publication Date: 2012/10/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E95.A.1676
Print ISSN: 0916-8508
Type of Manuscript: Special Section PAPER (Special Section on Advances in Adaptive Signal Processing and Applications)
Category: OFDM
maximum-likelihood (ML) estimation,  orthogonal frequency division multiplexing (OFDM),  carrier frequency offset,  channel estimation,  

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For maximum-likelihood (ML) estimation to jointly track carrier frequency offset (CFO) and channel impulse response (CIR) in orthogonal frequency division multiplexing (OFDM) systems, we present a finite high order approximation method utilizing the MATLAB ‘roots' command on the log-likelihood function derived from the OFDM received signal, coupled with an adaptive iteration algorithm. The tracking performance of this high order approximation algorithm is found to be excellent, and as expected, the algorithm outperforms the other existing first order approximation algorithms.