Manuscript received September 30;
1994;
revised April 1;
1995. This work was supported by the National Science Foundation under Grant 92-06148 NCRI. This work was presented in part at the Third ORSA Telecommunications Conference;
Boca Raton FL;
Mar;
1995;
and at the Fifth Winlab Workshop on Third Generation Wireless Information Networks;
East Brunswick;
NJ;
Apr. 1995. The author is with Wireless Information Networks Laboratory (WINLAB);
Dept. of Electrical and Computer Engineering;
Rutgers University;
Piscat-away;
08855-0909;
USA;
email: ryates@ece.rutgers.edu. IEEE Log Number 9413112;