Transcript Document
Communication Systems EE SUMMER CAMP ‘06 Binit Mohanty Ketan Rajawat Communication • Meaningful exchange of Information between two bodies. • • • • Speed Reliability Quantity Security A Communication System Data Source Source Coding Networking Channel Coding Channel Tx Up-Conversion Pre-Processing Modulation Rx Dn-Conversion Synchronization Channel Estimation Complementary Processes Source Coding • To reduce the size of the message • Exploits “redundancy” in the message • Areas Used: Probability, Math (of MTH 102N type) Networking • Routing : To plan a route for the message to be conveyed • Find the “best” path – Network considerations – Congestion – Speed • Statistics, Algorithm Design Channel Coding • Ensure fidelity of the transmitted signal • Adds “redundancy” • Linear Algebra, Algorithm Design Modulation & Preprocessing • How to send Digital signals in Analog channel? • Pulse Shaping: Some signals are more “practical” and “tractable” than others • Signals and System, DSP Transmitter • How will you “send” the signal? • Involves Microelectronics, Microwave Engg etc • Is not of primary concern to Comm! Channel • Wired – Additive White Gaussian Noise (AWGN) • Wireless – AWGN – Fading – Doppler • Statistics, Experimental Modelling Receiver • Similar to Transmitter! Synchronization • Time synchronization • Frequency synchronization • Signals and Systems, Linear Algebra Channel Estimation • Only in case of wireless • Knowledge of channel may help in – Power Control – Rx/Tx Decisions – Pulse shaping • Probability and Statistics, Modelling