无线通信基础[双语]教学课件1.pptVIP

;Wired Vs. Wireless Communication;Wired Vs. Wireless Communication;Wired Vs. Wireless Communication; How does signal propagate ? How much attenuation take place ? How does signal look like at the receiver ? How does signals using the same propag- ation channel ?;Provide comprehensive understanding of fundamental principles underlying wireless communications and networking Principles include: Characteristics and performance limits of wireless systems Techniques to overcome the difficulties;Outline;Outline;Email: jiangzhu@gfkd.mtn jiangzhu@nudt.edu.cn Phone: 74477 Office: 103 room, 4th Department’s General Building;Course information;Course information;Course information;Course information;Outline;Introduction to main topics;Introduction to main topics;Introduction to main topics;Introduction to main topics;Introduction to main topics;Outline;Overview of Wireless Communications;1.1 Definition of Wireless communication;1.1 Definition of Wireless communication;1.1 Definition of Wireless communication;Classification Band; Provides mobility A user can send or receive a message no matter where he or she is located Added convenience/reduced cost Enables communication without installing an expensive infrastructure;1.1 Definition of Wireless communication;1.1 Definition of Wireless communication;1.1 Definition of Wireless communication;1.2 History of wireless communication;1.2 History of wireless communication;1.2 History of wireless communication;1901 - Marconi successfully transmits radio signal across Atlantic Ocean from Cornwall to Newfoundland 1902 - First bidirectional communication across Atlantic 1909 - Marconi awarded Nobel prize for physics ;1914 - First voice over radio transmission 1924 - Bell Laboratories claim the first mobile 2-way voice based radio telephone 1920s - Mobile receivers installed in police cars in Detroit 1930s - Mobile transmitters developed; radio equipment occupied most of police car trunk 1935 - Frequen