Introduction to Wideband CDMA
This course provides an introduction to wideband CDMA systems. Wideband CDMA systems are used in a variety of 3G/4G cellular systems. A comprehensive understanding these systems will help the participant to work with, design and analyze a variety of cellular architectures. Topics ranging from 2G cellular standards overview, Wireless channel and propagation basics, multipath and mitigation techniques provide a good foundation for the understanding of WCDMA based system architectures. WCDMA design and components such as PN sequences, Channel partitioning and allocation methods, modulation schemes and uplink and downlink transmissions are discussed in detail. Finally we present CDMA2000 structures and advanced topics in signal processing and antenna arraying techniques.
|Course Duration:||32 Hours|
INTRODUCTION TO 2G DIGITAL CELLULAR SYSTEMS
IS-136, IS-95 and GSM.
IMT 2000 DIRECTIONS
3G Goals and Requirements, WCDMA 3G Candidates.
WIRELESS CHANNEL PROPAGATION BASICS
Multipath fading (Rayleigh & Rician), Shadowing, Delay Spread, Coherence Time and Bandwidth (Outdoor & Indoor), Path Loss Modeling (Hata/Bertoni Models).
MULTIPATH MITIGATION TECHNIQUES
RAKE Receiver, Power control, FEC: Convolutional codes, Interleaving, Turbo codes, Antenna diversity (S/S, EGC, and MRC).
IS-95 SYSTEM OVERVIEW
Uplink & Downlink Structures.
WCDMA SYSTEM COMPONENTS
PN Sequences: m sequences, Gold codes, Walsh, OVSF, Spreading & Despreading, RAKE Receiver, Echo Profile Manager, PN Time Tracking & Acquisition, SIR Power Control, Coherent Detection, Channel Estimation, QPSK vs. BPSK pilot symbols, Rate Matching, Variable Processing Gain, Modulation (HPSK) & Filtering.
3G WCDMA SYSTEM SCENARIOS
Cell search, Introduction to broadcast channels, 3 step method, Asynch vs. synch cells, Implementation impact, Channel assignment, RACH & FACH channel discussion, Slotted ALOHA, Traffic channel, UL/DL performance, Available data rates, Multicode transmission, Receiver implications, Performance.
3G RTT CHANNEL STRUCTURE (PHYSICAL AND LOGICAL)
CDMA2000 (Uplink and Downlink Structures), 3GPP (Uplink and Downlink Structures), OHG modifications.