Journal of South China University of Technology (Natural Science Edition) ›› 2006, Vol. 34 ›› Issue (1): 1-5.

• Electronics, Communication & Automation Technology •     Next Articles

Adaptive Bit-Loading Algorithm in OFDM System

Gong Han-dong  Ye Wu  Feng Sui-li  Ke Feng   

  1. College of Electronic and Information Engineering,South China Univ.of Tech.,Guangzhou 510640,Guangdong,China
  • Received:2005-06-09 Online:2006-01-25 Published:2006-01-25
  • Contact: 龚汉东(1974-)，男，博士生，主要从事OFDM信号处理方面的研究 E-mail:gonghand0ng@tom.com
  • About author:龚汉东(1974-)，男，博士生，主要从事OFDM信号处理方面的研究
  • Supported by:

    广东省自然科学基金资助项目(31391)

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Abstract:

The application of adaptive technique to OFDM (Orthogond Freguency Division Muhiplexing)systems can effectively improve the system performance.In this paper,an adaptive bit-loading algorithm to minimize the transmission power is investigated for the case of fixed data rate and restricted subcarrier bit rate.During the inves-tigation,the optimization of infinitesimal inform ation granularity is first solved to determine the low bound of the minimal power,and then the optimization of integer bit(finite information granularity)is solved,resulting in a fast integer bit-loading algorithm.Simulation results indicate that the proposed algorithm is an optimal bit—loading algo-rithm with high operating speed.

Key words: Orthogond Freguency Division Multiplexing, adaptive algorithm, optimization, bit loading