ADVANCED DIGITAL COMMUNICATIONS (UNIT 2)
Learning outcomes of the course unit
Knowledge of the basic principles for the design and optimization of the parameters of orthogonal frequency division multiple access (OFDMA)-based future wireless networks.
Course contents summary
Overview on OFDM-based wireless networks. Three relevant examples: DVB-T, WLAN, WiMAX. Introduction to the concept of "cross-layer" design and a counter-example. Fundamental aspects in the design of interfaces for future wireless broadband systems and protocol structure. Overview on MAC protocols, with particular details on OFDMA.
Advantages of OFDMA. Multiuser diversity: definition of this concept and computation of the diversity gain with adaptive coding and modulation (ACM) system with smart resource allocation.
Computation of the diversity gain with ACM system without intelligent allocation of the resources and comparison with the case of intelligent allocation, with a practical example. Optimality of OFDMA, till the proof of optimality of SISO-OFDMA. Multiuser multicarrier MIMO-OFDMA systems: system model and MIMO-OFDMA optimality theorem. Criteria of suboptimal resource allocation (with complexity linear on the number N of subcarriers for K users) for the subcarriers' assignment.
Lab experiences with Opnet: WiFi with OFDM and WiMAX.
IEEE 8021.11 Overview. Some information on 802.11 network architecture. MAC level technologies: some information on everything, but on framing format. Physical layer technologies, in detail.
IEEE 802.16e Overview. Physical layer technologies: base functions and system parameters; frame structure; data channel configuration (FUSC, PUSC, AMC): modulation and coding; multiple antennas; access and ranging. MAC layer technologies: network architectures; MAC sublevels and functions.
Liu & Li, "OFDM-based Broadband Wireless Networks: Design and Optimization." Wiley: 2005.
Oral exam on the topics covered in the course.