AI based Digital Companding Scheme for OFDM system using custom constellation Mapping and selection
Journal Title: International Journal on Computer Science and Engineering - Year 2010, Vol 2, Issue 4
Abstract
Data rate is important in telecommunication because it is irectly 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 odulator) , depending on the data to be transmitted . Depending on the data to be transmitted AI (Artificial Intelligent) block ompresses and expands the signal, 8 to 3 bit ompression is roposed(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.
Authors and Affiliations
K. Seshadri Sastry , Dr. M. S. Prasad Babu
Keywords
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