Submitted on: 21 October 1998.
Revised on: 23 December 1998.
Accepted on: 15 February 1999.
___________________IET Communications---INST ENGINEERING TECHNOLOGY-IET
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Submitted on: 05 July 2023.
Revised on: 10 September 2023.
Accepted on: 17 October 2023.
___________________IET Communications---INST ENGINEERING TECHNOLOGY-IET
Submitted on: 24 February 2016.
Revised on: 12 May 2016.
Accepted on: 30 June 2016.
___________________IET Communications---INST ENGINEERING TECHNOLOGY-IET
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Submitted on: 25 July 2020.
Revised on: 19 November 2020.
Accepted on: 11 January 2021.
___________________IET Communications---INST ENGINEERING TECHNOLOGY-IET