An improved ESPRIT-based blind CFO estimation for OFDM in the presence of I/Q imbalance

Author

Tzu-Chiao Lin ; Yen-Chang Pan ; Wei-Jen Tai ; See-May Phoong

Author_Institution

Dept. of EE, Nat. Taiwan Univ., Taipei, Taiwan

fYear

2013

fDate

16-19 June 2013

Firstpage

639

Lastpage

643

Abstract

The estimation of carrier frequency offset (CFO) is an important issue in the study of OFDM systems. In the past, many CFO estimation methods have been proposed. In particular, the ESPRIT-based blind CFO estimation method is attractive because of its bandwidth efficiency. It can yield accurate estimates and it works for non constant modulus modulation symbols. This paper improves the ESPRIT-based method in two ways. Firstly, we show how the information of virtual carrier location can be exploited to further enhance the estimation accuracy. Secondly, we also derive a new algorithm that can estimate CFO in the presence of I/Q imbalance.

Keywords

OFDM modulation; blind source separation; estimation theory; ESPRIT-based blind CFO estimation; I-Q imbalance; OFDM; carrier frequency offset; estimation accuracy; nonconstant modulus modulation symbols; virtual carrier location; Estimation; OFDM; Signal processing algorithms; Signal to noise ratio; Vectors; Wireless communication; CFO; ESPRIT; I/Q imbalance; OFDM;

fLanguage

English

Publisher

ieee

Conference_Titel

Signal Processing Advances in Wireless Communications (SPAWC), 2013 IEEE 14th Workshop on

Conference_Location

Darmstadt

ISSN

1948-3244

Type

conf

DOI

10.1109/SPAWC.2013.6612128

Filename

6612128