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A Study on Optimal Bit Loading Algorithms for Discrete MultiTone ADSL  

이철우 (수원대학교 전자공학과)
박광철 (국민대학교 전자정보통신공학과)
윤기방 (국립 인천전문대학 전자과)
장수영 (수원대학교 전자공학과)
김기두 (국민대학교 전자정보통신공학과)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TE / v.39, no.4, 2002 , pp. 395-402 More about this Journal
Abstract
In the conventional public switched telephone network(PSTN), there are various types of modulation that can be used in ADSL to offer fast data communication, two of which are CAP(Carrierless Amplitude Phase) and DMT(Discrete MultiTone). As we consider the current situation, DMT is getting more predominant in the market than CAP. One of the reasons is that it gives high performance in spite of its high complexity Since DMT divides the full range of bandwidth into 256 sub-channels, it can be highly adaptive in the circumstances, where the problems of attenuation and noise caused by the propagation distance are very crucial. In this paper, a new bit loading algorithm for DMT modulation is proposed. The proposed algorithm can be efficiently implemented in a way that it requires less computation than the conventional modulation techniques. In contrast to the conventional algorithms which perform sorting processing, the proposed algorithm uses look-up tables to reduce the repetition of calculation. Consequently, it is shown that less processing time and lower complexity can be achieved.
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