COMMUNICATION SYSTEMS LABORATORY (UNIT 2)
Learning outcomes of the course unit
Introduction to simulation and implementation of wireless networks.
Course contents summary
Introduction to wireless networks: historical perspective from cellular networks to ad hoc wireless networks. Propagation characteristics of mobile radio channel: attenuation and fading. Friis formula. Diversity techniques and smart antennas.
Introduction to OPNET and SUN Spot. The lab exercise will concern Zigbee systems.
[Possibilities for wireless medium access] Differences from fixed and wireless networks (bandwidth availability and transmission reliability). Voice networks (fixed assignment channel access techniques) and data networks (random access techniques).
Fixed resource assignment channel access techniques: FDMA, TDMA, CDMA, with corresponding characteristics (near-far problem and power control). Capacity of a CDMA system.
Comparison criteria between FDMA/TDMA/CDMA systems. Random access schemes for data networks. Aloha-like access techniques. CSMA-like acccess techniques: hidden terminal problem (BTMA and RTS/CTS); CSMA/CD
(IEEE 802.3); CSMA/CA (IEEE 802.11, IEEE 802.15.4).
Network performance with random access techniques: throughput and average delay.
Clustered sensor networks (Zigbee). Introduction to the project: hierarchical SUN Spot network.
Material provided by the teacher.
Midterm exam and final project, with discussion on the presented project.