NDLI: Adaptive OFDM system for multi-rate multi-user services in wireless communications

Content Provider	IEEE Xplore Digital Library
Author	Jaekyoung Moon Soon-Yong Park Sangjin Hong
Copyright Year	2002
Description	Author affiliation: Dept. of Electr. & Comput. Eng., State Univ. of New York, Stony Brook, NY, USA (Jaekyoung Moon; Soon-Yong Park; Sangjin Hong)
Abstract	The paper investigates the performance and throughput of an adaptive bit allocation and variable rate algorithm depending on channel state information (CSI) and transmit power in a multi-user OFDM transmission. The purpose of the multi-rate OFDM system using adaptive modulation is to increase bandwidth efficiency by controlling constellation size and to adapt the proper service for each user according to channel conditions and the transmit power while maintaining the transmission's quality of service (QoS) at the receiver. A fixed-rate adaptive OFDM system only exploits instantaneous channel state information by using several modulation levels, but it is inappropriate to multi-rate multi-user services. On the contrary, the multi-rate adaptive OFDM system is very efficient for a multi-user system requiring various services, because this system exploits not only instantaneous channel state information but also the transmit power. Computer simulation results show that the capacity of the adaptive multi-rate OFDM system can be adaptively changed for various services. A performance and throughput analysis of this system in multipath fading channels with different RMS delay spread is also presented.
Starting Page	1039
Ending Page	1043
File Size	470257
Page Count	5
File Format	PDF
ISBN	0780374428
ISSN	13476890
DOI	10.1109/WPMC.2002.1088336
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-10-27
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Wireless communication Programmable control Adaptive systems Bit rate Quality of service Bandwidth Throughput OFDM modulation Adaptive control Channel state information
Content Type	Text
Resource Type	Article

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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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