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Submitted on: 07 June 2012.
Revised on: 17 August 2012.
Accepted on: 05 September 2012.
___________________CIRCUITS SYSTEMS AND SIGNAL PROCESSING
Submitted on: 02 July 2012.
Revised on: 31 July 2012.
Accepted on: 18 September 2012.
___________________CIRCUITS SYSTEMS AND SIGNAL PROCESSING
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