Title :
Iterative InterCarrier Interference mitigation for mobile MIMO-OFDM systems
Author :
Zhang, Yang ; Li, Jiandong ; Pang, Lihua ; Ding, Zhi
Author_Institution :
State Key Lab. of Integrated Service Networks, Xidian Univ., Xi´´an, China
Abstract :
Multicarrier transmission over time varying frequency selective fading channels is investigated and a model for such a transmission scheme with emphasis on Multiple Input Multiple Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) systems is developed. The fast fading can destroy the orthogonality of subcarriers and cause serious InterCarrier Interference (ICI), thus leading to significant performance degradation that becomes severe as Doppler shift increases. To tackle this problem, a frequency domain iterative ICI mitigation algorithm is mathematically derived. By fully exploiting the separation property of Channel Transfer Function (CTF) matrix, ICI can be iteratively subtracted from received symbols and then Parallel Interference Cancellation (PIC) detection is performed to suppress multistream interference among different antennas. In particular, the complexity of the proposed strategy can be drastically reduced by restricting the interference computation to limited eighteen adjacent subcarriers, whereas the performance loss is quite minor. Simulation results illustrate that this scheme can effectively alleviate the impairment of ICI and asymptotically approach the ICI free performance at low-to-moderate Signal-to-Noise Ratio (SNR).
Keywords :
MIMO communication; OFDM modulation; fading channels; frequency-domain analysis; intercarrier interference; interference suppression; iterative methods; time-varying channels; Doppler shift; adjacent subcarriers; channel transfer function matrix; frequency domain algorithm; iterative intercarrier interference mitigation; mobile MIMO-OFDM systems; multicarrier transmission; multiple input multiple output systems; multistream interference suppression; orthogonal frequency division multiplexing; parallel interference cancellation; signal-to-noise ratio; subcarrier orthogonality; time varying frequency selective fading channels; Complexity theory; Doppler shift; Equalizers; Interference; MIMO; OFDM; Signal to noise ratio;
Conference_Titel :
Personal Indoor and Mobile Radio Communications (PIMRC), 2011 IEEE 22nd International Symposium on
Conference_Location :
Toronto, ON
Print_ISBN :
978-1-4577-1346-0
Electronic_ISBN :
pending
DOI :
10.1109/PIMRC.2011.6140111