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Submitted on: 26 December 2018.
Revised on: 08 April 2019.
Accepted on: 28 April 2019.
___________________IET Communications---INST ENGINEERING TECHNOLOGY-IET
Submitted on: 10 March 2001.
Revised on: 02 May 2001.
Accepted on: 19 June 2001.
___________________IET Communications---INST ENGINEERING TECHNOLOGY-IET