Title :
On the baseband compensation of IQ imbalances in OFDM systems
Author :
Tarighat, Alireza ; Sayed, Ali H.
Author_Institution :
Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA
Abstract :
OFDM is a widely recognized and standardized modulation scheme for future high bit rate communications. Implementation of OFDM-based systems suffers from inphase-quadrature phase (IQ) imbalances in the front-end analog processing. The IQ imbalances can severely limit the operating SNR and, consequently, the supported constellation sizes. In this paper, the effect of IQ imbalances on OFDM receivers is analyzed and system level algorithms to compensate for these distortions are proposed. The algorithms include different post and pre-FFT estimation and correction techniques.
Keywords :
OFDM modulation; channel estimation; compensation; distortion; equalisers; IQ imbalance baseband compensation; OFDM receivers; OFDM systems; adaptive equalization; channel estimation; digital baseband signal processing techniques; distortion compensation; distortion correction; front-end analog processing; high bit rate communications; inphase/quadrature phase imbalances; least-squares equalization; operating SNR; operating constellation sizes; pilot patterns; post-FFT estimation; pre-FFT estimation; Baseband; Digital video broadcasting; Discrete Fourier transforms; OFDM modulation; Phase distortion; Physical layer; Radio frequency; Signal processing; Signal processing algorithms; Wireless LAN;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 2004. Proceedings. (ICASSP '04). IEEE International Conference on
Print_ISBN :
0-7803-8484-9
DOI :
10.1109/ICASSP.2004.1327003
