NDLI: On Higher Order Modulations for OFDM in Frequency-Selective Fading Channels

Content Provider	IEEE Xplore Digital Library
Author	Lim, Gubong Wilson, Sarah Kate Cimini Jr, Leonard J. Taylor, Desmond P.
Copyright Year	1997
Abstract	It has been shown that adaptive modulation in OFDM significantly improves performance with perfect channel state information (CSI) at the transmitter. However, it is often difficult to obtain perfect CSI at the transmitter due to feedback overhead and estimation errors. In this letter, we study the optimal constellation size and coding rate when CSI is not available at the transmitter in frequency-selective fading channels. Our results indicate that increasing the constellation size uniformly for all subcarriers does not decrease the outage capacity. Moreover, we show that, rather than adapting the size of the constellation based on the receiver SNR and estimated root-mean-square delay spread, one should adapt the rate of the error control code.
Starting Page	641
Ending Page	644
Page Count	4
File Size	159573
File Format	PDF
ISSN	10897798
Volume Number	17
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-04-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	OFDM Delay Signal to noise ratio Fading Encoding Transmitters Convolutional codes outage capacity Channel coding RMS delay spread cyclic prefix
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Modeling and Simulation Computer Science Applications

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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