Title :
Pilot Sequence Design Scheme for MIMO OFDM Systems under Time-Varying Channels
Author :
Wu, Xiaoguang ; Kang, Guixia
Author_Institution :
Key Lab. of Universal Wireless Commun., Beijing Univ. of Posts & Telecommun., Beijing
Abstract :
Orthogonal frequency division multiplexing (OFDM) systems encounter performance degradations due to the time varying (TV) channels in wireless environments. As delay spread increases, symbol duration should also increase, and then OFDM systems become more susceptible to time-variations. Time-variations introduce inter-carrier interference (ICI), which must be mitigated to improve the performance in high delay and Doppler spread environments. In this paper, a pilot design scheme for multiple input multiple output (MIMO) OFDM system is proposed under TV channels. The properties of these pilots are described, and the simulation results are presented.
Keywords :
MIMO communication; OFDM modulation; intercarrier interference; interference suppression; time-varying channels; wireless channels; Doppler spread environment; MIMO OFDM system; TV channel; intercarrier interference mitigation; orthogonal frequency division multiplexing; pilot sequence design scheme; time-varying channel; wireless environment; Coherence; Delay; MIMO; OFDM modulation; Partial transmit sequences; Receiving antennas; TV; Time-varying channels; Transmitting antennas; Wireless communication;
Conference_Titel :
Vehicular Technology Conference, 2008. VTC Spring 2008. IEEE
Conference_Location :
Singapore
Print_ISBN :
978-1-4244-1644-8
Electronic_ISBN :
1550-2252
DOI :
10.1109/VETECS.2008.170
