Blind Frequency Offset Estimation Using Adaptive Step-Size LMS Algorithm for OFDM Communications

Chiao-Chan HUANG
Ann-Chen CHANG
Ing-Jiunn SU

IEICE TRANSACTIONS on Communications   Vol.E90-B    No.5    pp.1274-1277
Publication Date: 2007/05/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e90-b.5.1274
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
OFDM,  CFO,  time varying tracking,  LMS,  adaptive step-size,  

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In this Letter, we propose a least mean square (LMS) with adaptive step-size (AS) algorithm for adaptive blind carrier frequency offset (CFO) estimation in the orthogonal frequency division multiplexing system. In conjunction with the closed-loop estimate structure, the proposed algorithm eliminates the inter-carrier interference caused by time varying CFO. To improve the convergence performance of the fixed step-size LMS estimator, the regular AS LMS algorithm offers faster convergence speed and more accuracy to the CFO estimate. Several computer simulation examples are presented for illustrating the effectiveness of the proposed algorithm.