OFDM Multi-Carrier Modulation Techniques for Wireline and Wireless Systems
Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier modulation technique used in systems like ADSL, WLAN, and DAB etc. OFDM techniques have a wide variety of applications. This course enables participants to gain an insight into the fundamental principles and implementation techniques of OFDM. We discuss two leading applications: Asymmetric Digital Subscriber Line (ADSL) for high rate data transmission over the PSTN, and the IEEE 802.11 Wireless LAN Standard. The topics discussed helps you understand various techniques for implementing and optimizing OFDM-based systems.
|Course Duration:||32 Hours|
Single Carrier Systems: Bandwidth Efficiency, Noise Performance, Effect of Linear Distortion, Classical FDM: Performance Comparisons with Single Carrier Systems, Orthogonality.
FUNDAMENTALS OF OFDM SYSTEMS
Discrete Fourier Transform, Use of Cyclic Extension, Block Diagrams for Complex and Real Transmission Systems, Windowing, Frequency Domain Equalization, Use of Pulse Shortening in the Time Domain.
CODING FOR MULTICARRIER SYSTEMS
Block and Convolutional Coding, Trellis Coding, Code Initialization and Termination.
PERFORMANCE OVER TIME-INVARIANT CHANNELS
Channel Characterization, Error Probability with Non-White Gaussian Noise, Power and Bit Allocation among Subcarriers, Comparison with Single Carrier Systems and with Ideal Capacity, Susceptibility to Impulsive Noise and Narrowband Interference.
Description of Clipping Mechanism, Error Probability for Low and High Clip Levels, Bandwidth Regrowth, Techniques for Reduction of Clipping, Overlapped Versions of OFDM.
OFDM IN WIRELINE CHANNELS: ADSL
ADSL Services, Subscriber Line: Transmission function, Crosstalk Analysis, Standards for full rate and lite versions, Performance Measurements.
OFDM IN WIRELESS CHANNELS: WLAN
Wireless Channel Characterization: Time-varying Random Channels, Coherence Bandwidth, Coherence Time, Fading: Frequency Selective, Shadowing, Path Loss, Performance, Channel Estimation: Time Domain, Frequency Domain, OFDM Techniques in Wireless Ad-Hoc Networks, IEEE 802.11 Standard, HIPER LAN, Modem Design for Wireless LAN: Synchronization, Channel Estimation.
TIMING AND SYNCHRONIZATION
Effects of Timing and Frequency Offset, Techniques for Sample and Frame Synchronization, Frequency Offset Estimation, Characterization and Effects of Phase Noise.
OFDM IN MIMO SYSTEMS: SMART ANTENNAS
VOFDM Technology, Signal Processing Techniques for Antenna Array Processing in OFDM.
OFDM IN MULTIMEDIA COMMUNICATIONS: DAB
Digital Audio Standard: single frequency network, Digital Video: Coded OFDM.
OFDM VS. CDMA
A Comparison Between OFDM and CDMA for High Speed Wireless Applications, Main Challenges of OFDM Design for Wireless Applications.
COMBINATIONS OF OFDM AND SPREAD SPECTRUM
Future trends, Advanced techniques, Advances in implementation.