Digital Signal Processing and Wireless Communications

Course 029

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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:

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. Attending the course, DSP- Understanding Digital Signal Processing ( Course 27 ), is suggested.

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, 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

Digital ModulationMultiple AccessComplex EnvelopeDigital ModulationPSK,MSK, QAM ModulationPulse ShapingSpread SpectrumFrequency HoppingDirect sequence spread spectrumRAKE ReceiverReceiver block diagramWCDMA IMT 2000OFDMAPropagationRayleigh FadingPropagationFree Space PropagationAdjacent Channel InterferenceSimplex vs. duplexBERForward Error CorrectionBlock CodesInterleavingAntenna DiversityAdaptive AntennasAntenna DiversityMIMOAutomatic Frequency ControlAGCMultipath MitigationRF Communication system block diagramMonte Carlo

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