Title :
Low-complexity architecture of CFO and IQI compensation in MIMO-OFDM systems
Author :
Lin, Kuang-Hao ; Tseng, Jan-Dong
Author_Institution :
Dept. of Electron. Eng., Nat. Chin-Yi Univ. of Technol., Taichung, Taiwan
Abstract :
This paper presents a low-complexity architecture compensating for carrier frequency offset (CFO) and IQ imbalance circuits in MIMO-OFDM receiver systems. A coordinate rotation digital computer based sinusoid iteration generator is also developed for CFO estimation and correction in wireless communication receivers. Besides the main effect from the multi-path, some non-ideal effects from imperfect hardware design should also be considered such as the IQ imbalance from direct conversion in RF front-end. The improved low-complexity compensation algorithm is adopted to implement MIMO-OFDM receivers. The integrated CFO and IQ compensation circuits reduce 34% of area by using hardware sharing.
Keywords :
MIMO communication; OFDM modulation; multipath channels; radio receivers; IQ compensation circuits; IQ imbalance circuits; MIMO-OFDM receiver systems; RF front-end; carrier frequency offset; coordinate rotation digital computer; hardware sharing; imperfect hardware design; improved low-complexity compensation algorithm; multipath effect; sinusoid iteration generator; wireless communication receivers; Equalizers; Estimation; Hardware; OFDM; Receivers; Synchronization; Wireless communication; Carrier frequency offset (CFO); IQ imbalance; MIMOOFDM; architecture;
Conference_Titel :
Circuits and Systems (APCCAS), 2010 IEEE Asia Pacific Conference on
Conference_Location :
Kuala Lumpur
Print_ISBN :
978-1-4244-7454-7
DOI :
10.1109/APCCAS.2010.5775033
