Submitted on: 16 August 2006.
Revised on: 03 December 2006.
Accepted on: 22 January 2007.
___________________International Journal of Electronics and Telecommunications
Submitted on: 04 October 2006.
Revised on: 14 January 2007.
Accepted on: 14 February 2007.
___________________International Journal of Electronics and Telecommunications
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Submitted on: 24 December 2000.
Revised on: 26 February 2001.
Accepted on: 14 March 2001.
___________________International Journal of Electronics and Telecommunications