PROTOCOL STACK Application Layer Transport Layer Network Layer 33卫 Link Layer Physical Layer CS5602: Principles and Techniques for Sensors and Information Perception
PROTOCOL STACK CS5602: Principles and Techniques for Sensors and Information Perception 1 Application Layer Transport Layer Network Layer Link Layer Physical Layer Power Management Plane Mobility Management Plane Task Management Plane
Chapter 4 PHYSICAL LAYER CS5602: Principles and Techniques for Sensors and Information Perception
CS5602: Principles and Techniques for Sensors and Information Perception 2 Chapter 4. PHYSICAL LAYER
PHYSICAL LAYER Source Source Codeword;ChannelChannel Codeword eNcoder Encoder Modulator Transmitte Application Phvsical Wireless Laver Laver Source I Source Codeword ChannelChannel Codeword Decoder Demodulator Decode 一一一一一一一一一一一一一 CS5602: Principles and Techniques for Sensors and Information Perception
CS5602: Principles and Techniques for Sensors and Information Perception 3 PHYSICAL LAYER
Source coding (data compression) At the transmitter end the information source is first encoded with a source encoder Exploit the information statistics Represent the source with a fewer number of bits → source codeword Performed at the application layer CS5602: Principles and Techniques for Sensors and Information Perception
Source coding (data compression) ▪ At the transmitter end, the information source is first encoded with a source encoder ▪Exploit the information statistics ▪Represent the source with a fewer number of bits, ▪→ source codeword ▪ Performed at the application layer CS5602: Principles and Techniques for Sensors and Information Perception 4
Channel coding (error control coding) Source codeword is then encoded by the channel encoder → channel codeword Goal: address the wireless channel errors that affect the transmitted information CS5602: Principles and Techniques for Sensors and Information Perception
Channel coding (error control coding) ▪ Source codeword is then encoded by the channel encoder ▪ → channel codeword ▪Goal: address the wireless channel errors that affect the transmitted information CS5602: Principles and Techniques for Sensors and Information Perception 5