IEEE International Conference on Communications, Boston, Massachusetts, June 19-22, 1983 ; sponsored by IEEE Communications Society and Boston Section. IEEE Global Telecommunications Conference, New Orleans, Louisiana, December 2-5, 1985 ; sponsored by IEEE Communications Society and New Orleans Section. IEEE Global Telecommunications Conference & Exhibition, San Diego, California, December 2-5, 1990 ; sponsored by IEEE Communications Society and the San Diego IEEE Section. IEEE Global Telecommunications Conference, San Diego, California, Nov. 28-Dec. 1, 1983 ; sponsored by IEEE Communications Society and San Diego Section.