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Appl. Sci. 2015, 5(4), 1773-1789; doi:10.3390/app5041773

On the Design of an Elegant CFO Estimate System with the Assistance of Pilots for OFDM Transmission

1
Department of Electronics Engineering, National United University, No. 2 Lien-Da, Miaoli 360, Taiwan
2
Department of Optoelectronics and Communication Engineering, National Kaohsiung Normal University, No. 62, Shenjhong Road, Yanchao, Kaohsiung 824, Taiwan
*
Author to whom correspondence should be addressed.
Academic Editor: Hung-Yu Wang
Received: 6 October 2015 / Revised: 6 December 2015 / Accepted: 8 December 2015 / Published: 12 December 2015
View Full-Text   |   Download PDF [324 KB, uploaded 12 December 2015]   |  

Abstract

We present an improved line search method of the carrier frequency offset (CFO) estimate technique for OFDM systems aided with pilots. Unlike the conventional approaches, prior knowledge of channel order is unnecessary for the presented scheme, because we apply an interpolation technique for obtaining the extended channel frequency response. The search mechanism of the proposed approach is primarily based on the criterion that CFO can be found by discovering the frequency that achieves the minimum value of the well-defined channel residual energy. In addition, we substitute the line search method with an iterative approach to reduce the proposed estimator’s complexity. Analytical and simulation results have been conducted to verify the efficacy of the proposed schemes in this paper. View Full-Text
Keywords: orthogonal frequency division multiplexing (OFDM); carrier frequency offset (CFO); pilot-based CFO estimation; interpolation; iterative orthogonal frequency division multiplexing (OFDM); carrier frequency offset (CFO); pilot-based CFO estimation; interpolation; iterative
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Lin, T.-T.; Hwang, F.-H. On the Design of an Elegant CFO Estimate System with the Assistance of Pilots for OFDM Transmission. Appl. Sci. 2015, 5, 1773-1789.

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