Modeling and estimation of wireless OFDM channels by using time-frequency analysis

被引：7
作者：
Akan, Aydin [1 ]
Chaparro, Luis F.
机构：
[1] Istanbul Univ, Dept Elect & Elect Engn, TR-34320 Istanbul, Turkey
[2] Univ Pittsburgh, Dept Elect & Comp Engn, Pittsburgh, PA 15261 USA
来源：
CIRCUITS SYSTEMS AND SIGNAL PROCESSING | 2006年 / 25卷 / 03期
关键词：
wireless OFDM communications; time-varying channels; time-frequency analysis; discrete evolutionary transform;
D O I：
10.1007/s00034-005-0210-z
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Orthogonal frequency division multiplexing (OFDM) has become a very popular method for high data rate wireless communications because of its advantages over single carrier modulation schemes on multipath, frequency selective fading channels. However, intercarrier interference, due to Doppler frequency shifts, and multipath fading severely degrade the performance of OFDM systems. Estimation of channel parameters is required at the receiver. In this paper, we present a channel modeling and estimation method based on the time-frequency representation of the received signal. The discrete evolutionary transform provides a time-frequency procedure to obtain a complete characterization of the multipath, fading, and frequency selective channels. Simulations are used to illustrate the performance of the proposed procedure and to compare it with other time-varying channel estimation techniques.
引用
收藏
页码：389 / 403
页数：15
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