Academic Course Description SRM University Faculty of Engineering and Technology Department of Electronics and Communication Engineering CO2110 OFDM/OFDMA Communications Third Semester, 2016-17 (Odd semester) Course (catalog) description: The purpose of this course is to provide a state-of-art research status and an in-depth treatment of selected topics in OFDM and OFDMA which would provide enough background in wireless network characteristics with current wireless infrastructure.. Compulsory/Elective course: Elective for M. Tech (Communication Systems) II year students Credit hours: 3 credits Course coordinator(s) Dr. R.Kumar, Professor, Department of ECE Name of the instructor Class handling Office location Office phone Email Consultation Dr.R.Kumar M.Tech (Comm. Sys) Relationship to other courses TP11S1 7314 kumar.r@ktr.srmuniv.ac.in Pre-requisites : Digital Communication Techniques (CO 0508) Assumed knowledge : Basic knowledge in Communication Systems and Mobile networks Following courses : Ultra Wideband Communication Systems ( CO0568) References Day 1-1 to 1.30 pm 1. Tao Jiang, Lingyang Song, Yan Zhang, Orthogonal Frequency Division Multiple Access (OFDMA) Fundamentals and Applications, Auberbach Publications, Taylor & Francis Group 2010. 2.Yi(Geoffrey)Li, and Gordon L. Stuber, Othogonal Frequency Division Multiplexing, Springer Science + Business Media Inc., NY, USA, 2006. 3. Jeffrey G. Andrews, Arunabha Ghosh and Riaz Muhamed, Fundamentals of WIMAX: Understanding broadband wireless networking, 1st Edition, Prentice Hall Inc., NJ, 2007. 4. Lawrence Harte and Kalai Kalaichelvan, WIMAX explained: System fundamentals, 1st Edition, Althos Publishing, 2007. Course objectives To take a comprehensive look at OFDMA/OFDM including channel modeling, spectrum efficiency and resource management, To know how OFDMA/OFDM can combine with MIMO to give high data rate transmissions, To know about adaptive modulation, channel estimation, and synchronization in OFDM/OFDMA systems, Page 1 of 6
To know about co-operative OFDMA, and performance and optimization of relay assisted OFDMA networks, and To know about OFDMA applications and OFDMA based mobile WIMAX. Session # 1 2 3 4 5 6,7 Topics UNIT I- RADIO CHANNEL MODELING, RESOURCE ALLOCATION, AND SPECTRUM EFFICIENCY Multiple access communications Types of multiple access techniques Brief description of multiple access schemes Types of multiplexing schemes Brief description of multiplexing schemes OFDM/A Symbol structure Differences between OFDM and OFDMA Scalable OFDMA and brief description Advantages of OFDM over FDMA System block diagram of OFDM system Definition of Cyclic prefix, Inter Symbol Interference Use of Guard interval Major disadvantage of OFDM Assumptions regarding OFDM systems Principle of OFDMA Three Carrier allocation schemes and brief description OFDMA transmitter and receiver block diagram Detailed description of OFDMA transmitter and receiver Some basic definitions like Coherence bandwidth, Doppler spread, Coherence time Conceptual illustration of time-varying channel impulse response Tapped delay line channel model Detailed OFDM/A channel models like (a) Canonical OFDM/A channel model (b) Practical OFDM/A channel models (c) Non-stationary channel modeling (d) Extensions to MIMO and MB models Small scale fading versus Large scale fading Differences Channel impulse response versus Channel transfer function Differences OFDMA scheduling OFDMA resource allocation 8 Working out Example problems & Discussion of HW 1 problems 9,10 UNIT II- RESOURCE MANAGEMENT AND SYNCHRONIZATION:OFDM VS OFDMA OFDMA scheduling and resource allocation schemes like (a) Gradient-based Wireless scheduling and resource allocation problem formulation, (b) General OFDMA rate regions Text / Chapter Ref (1), Chap 1, 2,7 Ref (1)- Chap 1,2,7 Ref (1)-Chap 1,2,7 Ref (1)-Chap 1,2,7 Ref (1)- Chap 6,14 Page 2 of 6
Session # 11,12 13,14 15,16 17,18 19 20,21 22,23 24,25 26 27 Topics Optimal algorithms for OFDMA scheduling and resource allocation Primal optimal solution Synchronization in OFDMA downlink like (a) Symbol-time acquisition, (b) Carrier-frequency acquisition and (c) Tracking Synchronization in OFDMA uplink for (a) Synchronous and Asynchronous multiuser systems (b) Offset estimation in OFDMA uplink, and (c) Offset correction in OFDMA uplink Synchronization for WiMAX Working out problems & Discussion Text / Chapter Ref (1)- Chap 6,14 Ref (1)- Chap 6,14 UNIT III- ADAPTIVE MODULATION AND TRAINING SEQUENCE DESIGN Approaching capacity Multiuser diversity Organizing time-frequency grid 11,12,10 Algorithms for Adaptive modulation like (a) Optimization problem (b) SNR gap approximation and constant power allocation Algorithms for OFDMA like (i) Two-step allocation (ii) Joint subcarrier, bit and power allocation, (iii) Multi-cell considerations Channel feedback and compression Algorithms in Literature like (a) Data-limited, (b) Quantized, (c) Compressed. Impact of errors on Feedback data or delay 11,12,10 Fairness and QoS remarks Packet-based Multiuser OFDM uplink system model Cramer Rao bound and Asymptotic Cramer Rao bound Optimal condition for the training sequence for (a) Training design for channel estimation only, (b) Training design for Frequency offset estimation only, (c) Training design for Joint frequency and channel estimation Realization of Optimal training like (a) Time-Domain realizations (b) Frequency domain realizations and (c) Performance comparisons. 11,12,10 Differential space-time block codes Differential space-frequency block codes Working out problems & Discussion UNIT IV- COOPERATIVE OFDMA, PERFORMANCE AND OPTIMIZATION OF RELAY ASSISTED OFDMA NETWORKS Cooperative OFDMA Uplink signal model Channel capacity for Cooperative OFDMA for the case 28,29 (a) without considering frequency offsets, and (b) considering frequency offsets 30,31 Frequency offset estimation in the Cooperative scheme for (a) Point-to-point 18,19 Page 3 of 6
Session # 32 33 34 35,36 Topics frequency offset estimation, and (b) Cooperative frequency offset estimation Channel estimation in Cooperative OFDMA OFDMA multi-cell architecture Downlink and uplink optimization System performance Text / Chapter 18,19 Downlink and Uplink system performance 18,19 Working out problems & Discussion 37 38,39 40,41 42 UNIT V - OFDMA SYSTEMS AND APPLICATIONS, AND OFDMA BASED MOBILE WIMAX Mobile WiMAX OFDMA Physical layer (OFDM parameters, Subchannelization schemes, Burst profiles, Duplexing and framing, HARQ, Advanced antenna systems) Evolved Universal Terrestrial Radio Access (E-UTRA) 21, 22 E-UTRAN multiple access (Frame structure, OFDMA, Downlink transport channels, Downlink physical channels, SC-FDMA, Uplink transport channel, Uplink physical channel) OFDMA frame structure (OFDMA symbol, Cluster, Slot, Subchannel, OFDMA data mapping, Frame, subframe and zone, sub-burst) Subchannelization Power saving mode Handovers 43,44 Working out problems & Discussion 21, 22 21, 22 45 To Review classes for the entire course Evaluation methods Cycle Test - 20% Model Test - 20% Assignment - 5% Surprise Test - 5% End Semester - 50% Prepared by: Dr.R.Kumar, Professor, Department of ECE Dated: June 2016 Page 4 of 6
CO2110 OFDM/OFDMA COMMUNICATIONS L T P C Total Contact Hours 45 Prerequisite Nil PURPOSE 3 0 0 3 The purpose of this course is to provide a state-of-art research status and an in depth treatment of selected topics in OFDM and OFDMA which would provide enough background in wireless network characteristics not realizable with current wireless infrastructure. INSTRUCTIONAL OBJECTIVES The objectives of this course are to 1. Take a comprehensive look at OFDMA/OFDM including channel modeling, spectrum efficiency, and resource management 2. Know how OFDMA/OFDM can combine with MIMO to give high data rate transmissions, 3. Know about adaptive modulation, channel estimation, and synchronization in OFDM/OFDMA systems, 4. Know about co-operative OFDMA, and performance and optimization of relay assisted OFDMA networks, and 5. Know about OFDMA applications and OFDMA based mobile WIMAX. UNIT I - RADIO CHANNEL MODELING, RESOURCE ALLOCATION, AND SPECTRUM EFFICIENCY Introduction Statistical characterization OFDM/OFDMA channel models OFDMA scheduling and resource allocation System model transmit spectra Egress reduction techniques. UNIT II - RESOURCE MANAGEMENT AND SYNCHRONIZATION:OFDM VS OFDMA Resource allocation and Scheduling algorithms Synchronization in OFDMA downlink and uplink Synchronization for WIMAX UNIT III - ADAPTIVE MODULATION AND TRAINING SEQUENCE DESIGN Adaptive modulation algorithms Channel feedback Optimal condition for training sequence Realization of Optimal training Differential Space time Block codes Differential Space frequency block codes UNIT IV - COOPERATIVE OFDMA, PERFORMANCE AND OPTIMIZATION OF RELAY ASSISTED OFDMA NETWORKS Cooperative OFDMA uplink Channel capacity Frequency offset and channel estimation Uplink/Downlink optimization System performance. Page 5 of 6
UNIT V-OFDMA SYSTEMS AND APPLICATIONS, AND OFDMA BASED MOBILE WIMAX Mobile WIMAX Evolved Universal Terrestrial Radio Access OFDMA frame structure and sub channelization Power saving mode Handover. REFERENCES 1. Tao Jiang, Lingyang Song, and Yan Zhang, Orthogonal Frequency Division Multiple Access (OFDMA) Fundamentals and Applications, Auberbach Publications, Taylor & Francis Group, 2010. 2. Yi (Geoffrey) Li, and Gordon L. Stuber, Orthogonal Frequency Division Multiplexing, Springer Science+Business Media Inc., NY, USA, 2006. 3. Jeffrey G. Andrews, Arunabha Ghosh and Riaz Muhamed, Fundamentals of WIMAX: Understanding broadband wireless networking, 1st Edition, Prentice Hall Inc., NJ, 2007. 4. Lawrence Harte and Kalai Kalaichelvan, WIMAX explained: System fundamentals, 1st Edition, Althos Publishing, 2007. Page 6 of 6