Digital Signal Processing and Wireless Communications

Course 029

Summary:

This four-day course provides participants with an in-depth examination of wireless digital communication design strategies. Topics covered include digital modulation, radiowave propagation characteristics, signal detection methods, BER performance improvement and simulation techniques, DSP techniques, and RF/hardware architectures.

Learning Objectives:

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

Describe the migration path for modulation and demodulation techniques.
List and describe signal processing building blocks for wireless systems.
Explain methods for mitigating wireless channel impairments.
Perform system simulations ((de)modulation, BER and channel models).
Predict system performance and evaluate tradeoffs.
List TDMA and CDMA techniques, and 4G evolution.
Describe design issues for wireless systems, particularly those issues in which transmit and receive implementation affect system performance.

Target Audience:

System designers entering or currently working in the field of wireless digital communication will benefit from this comprehensive overview of practical design techniques. An electrical engineering background (or equivalent practical experience) is required.

Outline:

Day One

Digital Modulation
• Introduction to some wireless standards • Multiple Access Principles (TDMA, CDMA, FDMA, SDMA, OFDMA) • Complex envelope representation of signals and systems • Stochastic theory review • Digital modulation theory : BPSK, DPSK, QPSK, OQPSK, MSK, GMSK, FSK, DQPSK, p/4- DQPSK, FQPSK, p/4-FQPSK, 16PSK, 16QAM, 64QAM, etc., Pulse shaping filter selection, Nonlinear amplification affects (spectral regrowth), Advanced modulation techniques • Spread spectrum : Frequency Hoping, Direct Sequence CDMA, RAKE Receiver, IS-95 CDMA uplink and downlink example, PN code coarse and fine time tracking, Receiver block diagram, WCDMA Introduction • Orthogonal Frequency Division Multiplexing (OFDM) : Single Carrier and Multiple Carrier Examples, Multipath Mitigation Technique, Frequency Domain Equalization

Day Two

Radio Propagation Characterization
• AWGN channel • Rayleigh multipath fading • Rician multpath fading • Delay spread concept (flat vs. frequency selective fading) : Indoor propagation measurements, Outdoor propagation measurements • Log Normal Shadowing : Governing Principles, Carrier Frequency Dependency • Path Loss : Free Space, Hata, Walfish-Bertoni, etc., Micro cell measurements, Macro cell measurements • Man made interference : Adjacent channel interference, Co-channel interference • Simulating multipath fading channels : Jakes, LPF-ing, etc.
Signal Detection Methods
• BER performance discussion between theory and practice • Coherent detection architectures : Open Loop, Closed Loop, etc. • Non-coherent detection of p/4-DQPSK, DQPSK & GMSK : Differential Detection, Maximum Likelihood, etc. • Implementation issues and design for manufacturability • BER Performance Comparison : Various Channel Conditions

Day Three

Performance Improvement Techniques
• Forward Error Correction : Block, Convolutional, Turbo, Reed-Solomon, Concatenated • Punctured coding discussion : BER performance discussion • Interleaver/de-interleaver • Antenna receiver diversity techniques : Switching, Equal Gain, Maximal Ratio, Optimal Combining • Symbol timing recovery methods • Equalization techniques : Linear, decision feedback, MLSE • Equalization coefficient adaptation schemes : LMS, RLS, SMI, etc. • Space Time Equalization : ML perspective, Generalized RAKE (G-RAKE) • Adaptive Antenna Arrays : MMSE and MSINR based cost functions, Eigen-spectra investigation • Antenna transmitter diversity techniques : Space-time block codes, closed loop, MIMO

Day Four

Digital Signal Processing
• Automatic frequency control • Automatic gain control • Channel quality estimation techniques • Concept of dual detection receivers • Power control loops : Uplink and Downlink, Multipath mitigation • Transceiver block diagrams : Transmitter issues, Receiver structures • Transmit power amplifier linearization Overview
Computer Simulation Techniques
• Goals of computer simulations • Simulation tools : Complex Envelope domain • Estimation Methods : Monte Carlo, Importance Sampling, Tail Extrapolation, Semi-Analytic • A Comparison of the simulation methods discussed : Usage guidelines

Subject Areas Covered

Wireless Digital Communications Fundamentals
DSP Digital Signal Processing
OFDM and OFDMA Technology

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Key Concepts

Multiple Access • Complex Envelope • Digital Modulation • PSK,MSK, QAM Modulation • Pulse Shaping • Spread Spectrum • Frequency Hopping • Direct sequence spread spectrum • RAKE Receiver • Receiver block diagram • WCDMA IMT 2000 • OFDMA • Propagation • Rayleigh Fading • Propagation • Free Space Propagation • Adjacent Channel Interference • Simplex vs. duplex • BER • Forward Error Correction • Block Codes • Interleaving • Antenna Diversity • Adaptive Antennas • Antenna Diversity • MIMO • Automatic Frequency Control • AGC • Multipath Mitigation • RF Communication system block diagram • Monte Carlo