Robust Equalizer Design for OFDM receivers in presence of Frequency Dependent IQ-Mismatch

Author

Ray, Baijayanta ; Chakrabarti, Saswat ; Venkataraghavan, P.K.

Author_Institution

G.S. Sanyal Sch. of Telecommun., Kharagpur

fYear

2007

fDate

2-4 July 2007

Firstpage

1

Lastpage

6

Abstract

In this work, we study the effect of frequency dependent IQ mismatch (TX and RX) for a wideband OFDM system. We develop a joint channel response and IQ mismatch estimation scheme that can implicitly take care of frequency dependent IQ mismatch occurring at both TX and RX. We also propose a modified frequency domain equalizer structure that can work with the above estimates to efficiently remove the interference from the image subcarrier during equalization. Finally, we have presented closed form analytical expressions for performance analysis of the above scheme for a Gray coded 8-PSK constellation at moderately high SNR.

Keywords

Gray codes; OFDM modulation; equalisers; phase shift keying; radio receivers; wireless channels; Gray coded 8-PSK constellation; OFDM receivers; channel response; frequency dependent IQ-mismatch; image subcarrier; modified frequency domain equalizer structure; robust equalizer design; Calibration; Equalizers; Frequency dependence; Frequency domain analysis; Frequency estimation; Frequency response; Interference; OFDM; Performance analysis; Robustness; Frequency selective; IQ Mismatch; Wideband;

fLanguage

English

Publisher

ieee

Conference_Titel

Wireless and Optical Communications Networks, 2007. WOCN '07. IFIP International Conference on

Conference_Location

Singapore

Print_ISBN

1-4244-1005-3

Electronic_ISBN

1-4244-1005-3

Type

conf

DOI

10.1109/WOCN.2007.4284224

Filename

4284224