Estimation and Compensation of Frequency Selective TX/RX IQ Imbalance in MIMO OFDM systems

Author

Schenk, Tim C W ; Smulders, Peter F M ; Fledderus, Erik R.

Author_Institution

Eindhoven University of Technology, Radiocommunication Chair, PO Box 513, 5600 MB Eindhoven, The Netherlands. Tel. +31 40 247 3436, Fax. +31 40 245 5197, timschenk@ieee.org

Volume

1

fYear

2006

fDate

38869

Firstpage

251

Lastpage

256

Abstract

The influence, digital estimation and compensation of IQ mismatch at both transmitter (TX) and receiver (RX) side of a direct-conversion based multiple antenna OFDM system are presented in this paper. The resulting IQ imbalance can be split into a frequency independent and a frequency selective part. For estimation and compensation a two-step approach is presented, combining a data-aided and decision directed approach. First the frequency independent IQ imbalance is estimated using a preamble and, subsequently, the frequency selective IQ imbalance is removed using adaptive filtering. A numerical performance analysis reveals that the presented approach effectively mitigates the influence of IQ mismatch in OFDM-based space division multiplexing systems experiencing both TX and RX IQ imbalance.

Keywords

Adaptive filters; Frequency conversion; Frequency estimation; Low pass filters; MIMO; OFDM; Radio frequency; Radio transmitters; Receiving antennas; Transmitting antennas;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications, 2006. ICC '06. IEEE International Conference on

Conference_Location

Istanbul

ISSN

8164-9547

Print_ISBN

1-4244-0355-3

Electronic_ISBN

8164-9547

Type

conf

DOI

10.1109/ICC.2006.254736

Filename

4024126