无线通信技术（PPT课件讲稿）Wireless Communication Technology

Chapter 2 reless communication Technology (第2章[l, or Part Two in[2

Chapter 2 Wireless Communication Technology (第2章[1], or Part Two in [2])

Outline 2.aNtennas, Propagation and Propagation Characteristics(天线、传输、 传输特性) 22 Spread Spectrum(扩频)

Outline ◼ 2.1Antennas, Propagation and Propagation Characteristics (天线、传输、 传输特性) ◼ 2.2 Spread Spectrum(扩频)

2.aNtennas and Propagation Reading material: 1. Antenna Tutorial 2. Chapter 5 in [2]

2.1Antennas and Propagation Reading material: 1.Antenna Tutorial 2.Chapter 5 in [2]

2.1.1 Classifications of Transmission Media(2.4 in (21) Transmission medium(传输媒介) Physical path between transmitter and receiver a Guided media(导波介质) Waves are guided along a solid medium E.g., copper twisted pair, copper coaxial cable, optical fiber Unguided Media Provides means of transmission but does not guide electromagnetic signals a usually referred to as wireless transmission g, atmosphere, outer space

2.1.1 Classifications of Transmission Media (2.4 in [2]) ◼ Transmission Medium(传输媒介) ◼ Physical path between transmitter and receiver ◼ Guided Media(导波介质) ◼ Waves are guided along a solid medium ◼ E.g., copper twisted pair, copper coaxial cable, optical fiber ◼ Unguided Media ◼ Provides means of transmission but does not guide electromagnetic signals ◼ Usually referred to as wireless transmission ◼ E.g., atmosphere, outer space

Unguided media a Transmission and reception are achieved by means of an antenna a Configurations for wireless transmission a directional Omnidirectional

Unguided Media ◼ Transmission and reception are achieved by means of an antenna ◼ Configurations for wireless transmission ◼ Directional ◼ Omnidirectional