Title :
OFDM channel shortening in the presence of IQ imbalance
Author :
Xi Zhang ; Miyajima, Teruyuki
Author_Institution :
Grad. Sch. of Sci. & Eng., Ibaraki Univ., Hitachi, Japan
Abstract :
In orthogonal frequency division multiplexing systems, channel-shortening methods are effective for overcoming inter-block interference (IBI) caused by the delayed waves that exceed cyclic prefix length. In direct-conversion receivers, IQ imbalance in analog circuits causes serious performance degradation. In this paper, we discuss the impact of both frequency-independent and frequency-selective IQ imbalances on the interference suppression capability of a channel shortening method. Both theory and simulations show that the channel shortening method can suppress IBI regardless of the presence of IQ imbalances.
Keywords :
OFDM modulation; interference suppression; radio receivers; time-domain analysis; wireless channels; IBI; IBI regardless suppression; OFDM channel shortening; analog circuits; channel-shortening methods; direct-conversion receivers; frequency-independent IQ imbalance; frequency-selective IQ imbalance; interblock interference; interference suppression capability; orthogonal frequency division multiplexing systems; Cost function; Educational institutions; OFDM; Receivers; Signal to noise ratio; Time-domain analysis; Vectors; IQ imbalance; OFDM; channel shortening; inter-block interference; time-domain equalization;
Conference_Titel :
Signal and Information Processing (ChinaSIP), 2014 IEEE China Summit & International Conference on
Conference_Location :
Xi´an
Print_ISBN :
978-1-4799-5401-8
DOI :
10.1109/ChinaSIP.2014.6889326
