Academic Course Description SRM University Faculty of Engineering and Technology Department of Electronics and Communication Engineering CO2110 OFDM/OFDMA COMMUNICATIONS Third Semester, 2014-15 (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) Instructor(s) Dr. R.Kumar, Professor, Department of ECE Name of the instructor Class handling M.Tech Dr.R.Kumar (Comm. Sys) Relationship to other courses Office location Office phone Email 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) Consultation Day 1-1 to 1.30 pm References 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. Page 1 of 7
4. Lawrence Harte and Kalai Kalaichelvan, WIMAX explained: System fundamentals, 1st Edition, Althos Publishing, 2007. Section Schedule Comm. Sys Day 1 Day 2 Day 3 Day 4 Professional component General - 0% Basic Sciences - 0% Engineering sciences & Technical arts - 0% Professional subject - 100% Broad area: Communication Signal Processing Electronics VLSI Embedded Test Schedule - Theory Course objectives S. No. Test Portions Duration 1 Cycle Test 100 min 2 Model Exam 3 hrs 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, 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. Hourly teaching plan Session UNIT I- RADIO CHANNEL MODELING, RESOURCE ALLOCATION, AND SPECTRUM EFFICIENCY 1 Multiple access communications Types of multiple access techniques Ref (1), Chap 1, 2,7 Page 2 of 7
Session 2 3 4 5 6,7 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 Ref (1)- Chap 1,2,7 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 Ref (1)-Chap 1,2,7 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 Ref (1)-Chap 1,2,7 UNIT II- RESOURCE MANAGEMENT AND SYNCHRONIZATION:OFDM VS OFDMA 9,10 11,12 13,14 OFDMA scheduling and resource allocation schemes like Ref (1)- Chap 6,14 (a) Gradient-based Wireless scheduling and resource allocation problem formulation, (b) General OFDMA rate regions Optimal algorithms for OFDMA scheduling and resource allocation Primal optimal solution Ref (1)- Chap 6,14 Synchronization in OFDMA downlink like (a) Symbol-time acquisition, Page 3 of 7
Session 15,16 17,18 (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 Ref (1)- Chap 6,14 Synchronization for WiMAX Working out Example problems & Discussion of HW 2 problems UNIT III- ADAPTIVE MODULATION AND TRAINING SEQUENCE DESIGN 19 20,21 22,23 24,25 26 27 Approaching capacity Multiuser diversity Organizing time-frequency grid Ref (1), Chap 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 Fairness and QoS remarks Ref (1), Chap 11,12,10 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. Ref (1), Chap 11,12,10 Differential space-time block codes Differential space-frequency block codes Working out Example problems & Discussion of HW 3 problems UNIT IV- COOPERATIVE OFDMA, PERFORMANCE AND OPTIMIZATION OF RELAY ASSISTED OFDMA NETWORKS 28,29 Cooperative OFDMA Uplink signal model Ref (1), Chap 18,19 Page 4 of 7
Session 30,31 32 33 34 35,36 Channel capacity for Cooperative OFDMA for the case (a) without considering frequency offsets, and (b) considering frequency offsets Frequency offset estimation in the Cooperative scheme for (a) Point-to-point frequency offset estimation, and (b) Cooperative frequency offset estimation Channel estimation in Cooperative OFDMA Ref (1), Chap 18,19 OFDMA multi-cell architecture Downlink and uplink optimization System performance Downlink and Uplink system performance Ref (1), Chap 18,19 Working out Example problems & Discussion of HW 4 problems UNIT V - OFDMA SYSTEMS AND APPLICATIONS, AND OFDMA BASED MOBILE WIMAX 37 38,39 40,41 42 Mobile WiMAX OFDMA Physical layer (OFDM parameters, Subchannelization schemes, Burst profiles, Duplexing and framing, HARQ, Advanced Ref (1), Chap 21, 22 antenna systems) Evolved Universal Terrestrial Radio Access (E-UTRA) 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) Ref (1), Chap 21, 22 Subchannelization Power saving mode Handovers 43,44 Working out Example problems & Discussion of HW 5 problems Ref (1), Chap 21, 22 45 To Review classes for the entire course Evaluation methods Cycle Test - 20% Model Test - 20% Assignment - 5% Surprise Test - 5% Page 5 of 7
End Semester - 50% Prepared by: Dr.R.Kumar, Professor, Department of ECE Dated: July 2014 Revision No.: 00 Date of revision: NA 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 Page 6 of 7
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. 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 7 of 7