Interleaving and modulation The encoded channel codeword is then interleaved to combat the bursty errors Channel coding and the interleaving mechanism help the receiver either to Identify bit errors to initiate retransmission Correct a limited number of bits in case of errors CS5602: Principles and Techniques for Sensors and Information Perception
Interleaving and modulation ▪ The encoded channel codeword is then interleaved to combat the bursty errors ▪ Channel coding and the interleaving mechanism help the receiver either to ▪Identify bit errors to initiate retransmission ▪Correct a limited number of bits in case of errors. CS5602: Principles and Techniques for Sensors and Information Perception 6
Interleaving and modulation Then, an analog signal (or a set thereof) is modulated 2 the digital information to create the waveform that b ill be sent over the channel Finally, the waveforms are transmitted through the antenna to the receiver CS5602: Principles and Techniques for Sensors and Information Perception
Interleaving and modulation ▪ Then, an analog signal (or a set thereof) is modulated by the digital information to create the waveform that will be sent over the channel ▪ Finally, the waveforms are transmitted through the antenna to the receiver CS5602: Principles and Techniques for Sensors and Information Perception 7
Wireless channel propagation The transmitted waveform travels through the channel Meanwhile, the waveform is attenuated and distorted by several wireless channel effects CS5602: Principles and Techniques for Sensors and Information Perception
Wireless channel propagation ▪ The transmitted waveform travels through the channel ▪ Meanwhile, the waveform is attenuated and distorted by several wireless channel effects CS5602: Principles and Techniques for Sensors and Information Perception 8
Information Processing Source stream Source codeword Channel codeword ource Channel 田图 Encoder Encode 图 Correlated bits 彐 Control bits 3 Parity bits CS5602: Principles and Techniques for Sensors and Information Perception
Information Processing CS5602: Principles and Techniques for Sensors and Information Perception 9
Wireless communication basics provides data and starts MAC protocol Transmission Data to be Transmitted ncode processing Start Symbol Transmission Encoded data to be transmitted MAC Delay Transmitting encoded bits durations几几几∏几L「 amples↑↑ttt+↑↑↑↑↑↑↑↑↑↑↑↑ Start Symbol Search Receiving individual bits Reception Start Symbol Detection Encoded data received Decode processing Data Received CS5602: Principles and Techniques for Sensors and Information Perception
Wireless Communication Basics CS5602: Principles and Techniques for Sensors and Information Perception 10