Paper Info
Title
Adaptive Channel Shortening Equalization For Coherent OFDM Doubly Selective Channels.
Abstract
In this work we propose a new adaptive channel shortening technique for doubly selective (time-varying frequency-selective) Orthogonal Frequency Division Multiplexing (OFDM) channels. OFDM is considered to be a very bandwidth efficient wireless transmission technique (due to its tightly packed orthogonal subcarrier structure) for multi-path channels. Transmissions in multipath channels exhibiting long delay spread channels, however, require an excessively long cyclic prefix (CP) to prevent intersymbol interference (ISI) with OFDM, and thus undesirably reduce the bandwidth and power efficiency of the information transmission. Channel shortening equalization (CSE) is used to shorten the channel delay spread to a certain length (less than the CP length) so that ISI is minimized. Our technique adapts to channel variation and provides a significant bit error rate (BER) improvement in performance over non-adaptive techniques. We show that the adaptive technique improves the demodulated BER by greater than a factor of 10, with diversity order 1, in a mobile long delay spread (frequency-selective) channel, while the nonadaptive method exhibits a BER floor at 10(-1).
Year
DOI
Venue
2006
10.1109/ICASSP.2006.1660980
ICASSP
Keywords
Field
DocType
OFDM modulation,equalisers,error statistics,intersymbol interference,mobile radio,multipath channels,time-varying channels,BER,OFDM,adaptive channel shortening equalization,bit error rate,channel delay spread,cyclic prefix,delay spread channels,doubly selective channels,intersymbol interference,mobile long delay spread,multipath channels,time-varying frequency-selective channels,wireless transmission technique
Subcarrier,Mathematical optimization,Intersymbol interference,Diversity scheme,Cyclic prefix,Computer science,Delay spread,Computer network,Communication channel,Electronic engineering,Orthogonal frequency-division multiplexing,Bit error rate
Conference
Volume
ISSN
Citations 
4
1520-6149
0
PageRank 
References 
Authors
0.34
3
2
Name
Order
Citations
PageRank
John E. Kleider1525.91
Xiaoli Ma253732.48