Advanced Digital Communications

Course 147

Summary:

This three-day seminar enables participants to make reasonable design choices based solely on system requirements and constraints. Emphasis is placed on Turbo-code concepts, Trellis-coded modulation, and fading channels.

Learning Objectives:

Upon completing the course, the participant will be able to:

• Make system design choices based on requirements and constraints.
• Evaluate system performance in a structured way.
• Describe the transformation of data-bits to channel-bits to symbols to chips.
• Explain the fundamental concepts of Turbo encoding and decoding.
• Design a Trellis-coded modulation scheme.
• Describe the ongoing research for efficient signaling.
• Characterize fading channels and how to mitigate their effects.
• Describe various advanced technology (CDMA, GSM) applications.

Target Audience:

Engineers, programmers, chip designers, and engineering managers of all expertise levels involved in the design, planning, implementation, or testing of advanced communication systems. Before taking this course, attendees should already be familiar with digital communication fundamentals.

Outline:

Day One

Modulation and Coding Scheme Selections
• Bandwidth-limited systems • Power-limited systems
Transformation of Data-bits to Channel-bits to Symbols to Chips
Spread-spectrum Systems
• Direct sequence • Frequency hopping • Processing gain • CDMA applications
Digital Communication System Evaluation and Class Exercises
Finite State Machines and Convolutional Coding
• Partial response signaling • Channel models: hard versus soft decisions • Free distance and coding gain • Soft-decision Viterbi decoding

Day Two

Turbo Concepts and Implementation
• Turbo codes • Near-Shannon-limit error-correcting performance • Decoder implementation • Numerical examples
Trellis-Coded Modulation
• Coding gain for bandwidth-limited channels • Ungerboeck set-partitioning • Code-to-signal mapping • Complexity vs. improved error performance • Multidimensional trellis coding
Fading Channels
• Large- and small-scale • Frequency-selective and flat • Fast and slow • Multipath, channel-induced intersymbol interference (ISI) • Coherence bandwidth • Coherence time • Doppler spreading
Fading Degradation Effects
• SNR loss • Irreducible bit-error-rate (BER) • ISI distortion • Pulse mutilation

Day Three

Techniques to Mitigate Effects of Fading Distortion
• Robust modulation • Equalization • Spread spectrum • Orthogonal FDM (OFDM)
Diversity Mitigation
• Frequency, time, and spatial • Spread spectrum • Coding and interleaving • Class exercise: designing a wireless mobile system CDMA • Interference suppression • Forward and reverse channels • Orthogonalizing and spreading • Rake receiver for exploiting multipath effects GSM • GMSK modulation • Coding and interleaving • Viterbi equalizer
Evolution of Coded Modulation
• QPSK, OQPSK, QAM, MSK • Continuous-phase modulation (CPM), smoothing df/dt • Power and bandwidth performance, multi-h CPM

Subject Areas Covered

Wireless Digital Communications Fundamentals

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