NDLI: A Grouping Method of Bit Loading for Real-Time OFDM-Based Wireless Networks

Content Provider	IEEE Xplore Digital Library
Author	Liming Hou Xiaokang Lin
Copyright Year	2008
Description	Author affiliation: Dept. of Electron. Eng., Tsinghua Univ., Beijing (Liming Hou)
Abstract	A Grouping method of bit and power allocation in orthogonal frequency division multiplex (OFDM) system is presented in this paper. The complexity of BABGS algorithm, as bit allocation based on grouping subcarriers (BABGS), is lower than suboptimal algorithms. This algorithm aims to minimize the total transmitted power under the constraint of bit error rate (BER) and total bit rate, so it is based on margin adaptive (MA) principle. The structure of the proposed algorithm includes two stages. In the first stage, the subcarriers are divided into several groups according to the channel characteristics and the initial bits are assigned to per subcarrier in each group at the same time. The second stage is to adjust bits of each subcarrier in order to minimize the total transmission power. Compared with the Nader algorithms, this algorithm is reduced computing complexity by 20% and suitable to be utilized in deep fading frequency selected channel of the real-time systems. And its performance is still close to suboptimal algorithms.
Starting Page	1
Ending Page	4
File Size	130587
Page Count	4
File Format	PDF
ISBN	9781424421077
DOI	10.1109/WiCom.2008.185
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-10-12
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Real time systems Fading Algorithm design and analysis Wireless networks OFDM Bit rate Bit error rate Frequency division multiplexing Computational complexity Power engineering and energy
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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