Blind Frequency Ambiguity Resolution in OFDM Systems Using a Linear Precoder

Authors:
Weiyang Xu;Xiaolin Fu
Affiliations:
College of Communication Engineering, Chongqing University, Chongqing, China 400044;School of Mechatronics and Automotive Engineering, Chongqing Jiaotong University, Chongqing, China 400074
Venue:
Wireless Personal Communications: An International Journal
Year:
2013

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Abstract

This paper presents a technique of the blind frequency ambiguity resolution for orthogonal frequency division multiplexing systems. The basic idea behind this method is a linear precoding scheme applied to data in predefined subcarriers before the inverse discrete Fourier transform to deploy a correlation structure, thus the integer part of the carrier frequency offset can be estimated after the discrete Fourier transform via cross correlation operations among these subcarriers. Performance analysis is carried out to gain insight into the relationship between the false estimation probability and system parameters. Allocation of these predefined subcarriers is optimized to avoid false estimation. Finally, numerical simulations are conducted to demonstrate the efficiency of the proposed method and the performance comparison with the existing estimators.