主題：Metal oxide semiconductors, Complementary|Design and construction. ; Radio circuits|Design and construction. ; Software radio. ; Wireless communication systems|Equipment and supplies|Design and construction.
主題：Personal communication service systems. ; User-centered system design. ; Wireless communication systems. ; Engineering. ; Communications Engineering, Networks. ; Computer Systems Organization and Communication Networks.
主題：Computer networks ; Computer networks|Security measures ; Wireless communication systems ; Computer Science. ; Algorithm Analysis and Problem Complexity. ; Computer Communication Networks. ; Computers and Society. ; Data Encryption. ; Management of Computing and Information Systems. ; Systems and Data Security.
