文章基本信息

标题：AI based Digital Companding Scheme for OFDM system using custom constellation Mapping and selection
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作者：K.Seshadri Sastry ; Dr. M. S. Prasad Babu
期刊名称：International Journal on Computer Science and Engineering
印刷版ISSN：2229-5631
电子版ISSN：0975-3397
出版年度：2010
卷号：2
期号：4
页码：1381-1386
出版社：Engg Journals Publications
摘要：Data rate is important in telecommunication because it is directly proportional to the cost of transmitting the signal. Saving bits is the same as saving money . In this paper we propose new digital companding scheme for OFDM system based on using different constellation orderings (QAM modulator) , depending on the data to be transmitted . Depending on the data to be transmitted AI (Artificial Intelligent) block compresses and expands the signal, 8 to 3 bit compression is proposed(32:1 compression). The proposed scheme was simulated in Matlab7.4 and it was shown that the proposed companding scheme effective with low compression error.
关键词：Companding ; OFDM system.