Modern Digital Modulation Techniques

Course 016

Greenbelt, MD	Oct 18-Oct 22, 2010
Course 016-4282	Presented by Irving Kalet
Register by 9/13/2010 and pay $1995, otherwise pay $2195

Request an onsite quote for this course

Summary:

Modern digital modulation techniques and multiple access techniques have an impact on our everyday life. Techniques such as adaptive modulation and coding methods, OFDM, DMT, CDMA, GMSK, QAM and others, are used in all areas of wireless, cellular, wireline, and satellite communication systems. These modulations are used in Second and Third Generation IMT-2000 Cellular Systems (including GSM, GPRS, IS-95 and WCDMA), broadband wireless systems (e.g., Hiperlan2 and IEEE802.11) and xDSL systems such as HDSL, ADSL and VDSL.
Modulation and multiple access techniques, as well as new ideas such as MIMO, BLAST and space-time coding, are used at the physical interface of all major transmission systems for data communication. It is thus important to have a thorough understanding of these techniques both for system designers and suppliers of systems, as well as integrators and operators, who make use of the systems.

Learning Objectives:

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

• Understand multiple access techniques such as WCDMA, the major multiple access technique of the IMT-2000 3G systems, and on OFDMA, the modulation technique used in broadband wireless access and a candidate for 4G mobile systems.
• Understand BLAST and MIMO concepts and how they are used to greatly improve bandwidth efficiency for wireless communications.
• Analyze new techniques to improve communications efficiency, such as adaptive modulation and coding techniques, OFDM, space-time coding and iterative techniques.
• Evaluate the performance of modulations on channels with Rayleigh fading, and the diversity techniques used to overcome degradation caused by fading.
• Analyze different modulations and multiple access techniques, on the basis of detectability, bandwidth and complexity of implementation
• Understand constant envelope CPM modulations such as GMSK, used in the GSM, GPRS, Bluetooth, and EDGE systems.
• Evaluate the modulation techniques used in wireline systems, such as ADSL and VDSL, as well as their DMT implementations.

Target Audience:

This course will be of interest to hardware, software and systems engineers who are entering the field of communication systems, or experienced engineers who are not familiar with modern modulations and concepts. The course participant should have some familiarity with the Fourier Transform and the topic of probability. An electrical engineering background (BSEE or equivalent practical experience) is recommended.

Outline:

Day One

Baseband Signaling
• System model-channel, the multipath channel (Rayleigh, frequency-selective fading) • Review of Fourier transform, power spectral density, white noise • Nyquist signaling • Partial response signals • Differential encoding • Intersymbol interference (ISI), Linear equalization

Day Two

Signal Space, Optimum Detection
• Signal space • Modulation descriptions • Optimum detection of binary signals • Correlation detector, matched filter
Binary Modulations (Coherent)
• BPSK, BFSK, spectra, detectability • Performance over Rayleigh Fading Channel • Antenna Diversity • BLAST (MIMO)

Day Three

MSK-Type Signals
• QPSK, SQPSK (IS-95, W-CDMA) • MSK - Type (MSK, SFSK) • Adjacent channel interference
M-ary Signals
• Optimum detection • MPSK (EDGE) MFSK • QAM, (V.32, V.34 modems) CAP (ADSL, VDSL) • Orthogonal signals (MFSK)
Shannon Information Theory
• Introduction to information theory • Channel capacity • Turbo coding discussion • Multitone systems (ADSL, g.lite, VDSL) • Example: multitone over the twisted pair channel - implementation • Discrete multitone (DMT)-ADSL - implementation • OFDM- for mobile and broadband (IEEE 802.11a) wireless communication • OFDM and BLAST

Day Four

Trellis Coding, Viterbi Algorithm
• The Viterbi algorithm (VA) • The VA as an equalizer • Ungerboeck trellis coding • Multidimensional coding • Interleaving for Rayleigh fading
Turbo-coding and Iterative Decoding
• The turbo-coding concept • Iterative decoding combined with CPM, antenna diversity, equalization
CPM-Type Modulations - TFM, GTFM, GMSK
• Continuous Phase Modulation (CPM) • Gaussian MSK (GMSK) - GSM, DCS, DECT, CDPD • Tamed FM (TFM) • Generalized TFM (GTFM)
Adjacent Channel Crosstalk in CPM Signals
• Adjacent channel crosstalk performance • New CPM schemes

Day Five

Noncoherent Detection
• DPSK (optimum detection)
Discriminator Detection of Digital FM Signals
• FSK • pi/4 - QPSK modulation used in IS-136, JDC
Discriminator Detection of CPM Signals
• GMSK, TFM, GTFM, LRC signals (using the Viterbi algorithm) used in DECT, CDPD • Performance Comparison
Cellular Communications
• FDMA, TDMA (GSM, IS-136) • Discussion of GSM (GPRS) and IS-136 • CDMA systems - concepts • IS-95 (1 x EV) • IMT-2000 WCDMA Systems (FDD, TDD, FDMA)
Decision Feedback Equalization - Tomlinson Filtering
• Tomlinson filter • Decision feedback equalization • Trellis coding in an ISI environment • Tomlinson filter and trellis coding -- implementation using decision feedback equalization
Time- Permitting-The 56-Kbps Modem (V.90) - Breaking the Shannon Barrier?
• Theoretical basis • Some implementation ideas • V.91 (?)
Future Directions
• Ultra-Wideband (UWB) Radio

Subject Areas Covered

Modulation Techniques
Featured Advanced Programs
OFDM and OFDMA Technology
MIMO Technology
Wireless Digital Communications Fundamentals

Check the above links for other courses that may interest you based on subject matter.