Submitted on: 09 January 1998.
Revised on: 01 February 1998.
Accepted on: 16 March 1998.
___________________IEEE Wireless Communications Letters
Submitted on: 21 January 2021.
Revised on: 12 February 2021.
Accepted on: 06 April 2021.
___________________IEEE Wireless Communications Letters
Submitted on: 10 March 2011.
Revised on: 10 May 2011.
Accepted on: 18 June 2011.
___________________IEEE Wireless Communications Letters
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Submitted on: 21 March 2005.
Revised on: 29 May 2005.
Accepted on: 15 June 2005.
___________________IEEE Wireless Communications Letters
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