K.Seshadri Sastry and Dr. M. S. Prasad Babu (2010) AI based Digital Companding Scheme for OFDM system using custom constellation Mapping and selection

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AI based Digital Companding Scheme for OFDM system using custom constellation Mapping and selection

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CONTRIBUTORS:

	Author:	K.Seshadri Sastry
	Author:	Dr. M. S. Prasad Babu

JOURNAL:

International Journal on Computer Science and Engineering (IJCSE), 2(4), 1381 - 1386.

YEAR:

2010

PUB TYPE:

Journal Article

SUBJECT(S):

Companding , OFDM system.

DISCIPLINE:

Computer Science

HTTP:

http://www.enggjournals.com/ijcse/doc/IJCSE10-02-04-128.pdf

LANGUAGE:

English

PUB ID:

103-488-577 (Last edited on 2011/06/11 03:43:09 GMT-6)

SPONSOR(S):

ABSTRACT:
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.

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