Title :
Estimation and compensation of TX and RX IQ imbalance in OFDM-based MIMO systems
Author :
Schenk, Tim C W ; Smulders, Peter F M ; Fledderus, E.R.
Author_Institution :
Dept. of TTE, Eindhoven Univ. of Technol., Netherlands
Abstract :
This paper studies the influence, estimation and digital compensation of IQ imbalance at both transmitter and receiver side of a multiple-input multiple-output (MIMO) OFDM system. Hereto a preamble is designed, which enables simultaneous estimation of the channel and imbalance parameters. New estimation approaches for TX, RX and joint TX and RX IQ imbalance in MIMO OFDM systems are proposed and evaluated. Results from a numerical study show that all three proposed compensation approaches are able to significantly suppress the influence of IQ mismatch.
Keywords :
MIMO systems; OFDM modulation; antenna arrays; channel estimation; matrix algebra; receiving antennas; transmitting antennas; IQ imbalance estimation; OFDM-based MIMO systems; channel estimation; digital compensation; imbalance parameters estimation; multiple-input multiple-output system; receiver; transmitter; Fading; Frequency conversion; MIMO; Monolithic integrated circuits; Next generation networking; OFDM; Parameter estimation; Radio transmitters; Receivers; Wireless LAN;
Conference_Titel :
Radio and Wireless Symposium, 2006 IEEE
Print_ISBN :
0-7803-9412-7
DOI :
10.1109/RWS.2006.1615133
