ADVANCED TOPICS IN DIGITAL SIGNAL PROCESSING
An Examination of DSP in Modern Fourth Generation Modems
ADVANCED TOPICS IN ADVANCED TOPICS IN DIGITAL SIGNAL PROCESSINGDIGITAL SIGNAL PROCESSING
An Examination of DSP in Modern An Examination of DSP in Modern Fourth Generation ModemsFourth Generation Modems
fredfred harrisharrisSan Diego State UniversitySan Diego State University
Applied Technology Institute 349 Berkshire Drive Riva, Maryland 21140 888-501-2100/410-956-8805 Website: www.ATIcourses.com Email: [email protected]
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Course Outline1. Introduction. An examination of Past,
Present, and Future Digital Modulation Systems.2. Digital Filters. FIR Filters, Resampling
Filters, Interpolators and Decimators, Half BandFilters, Cascade-Integrator-comb (CIC) filters,Hogenauer Filters, Multirate IIR filters.
3. Channelizers. Modulation andDemodulation. Design Techniques. WorkloadComparisons.
4. Filter Design T echniques. WindowDesigns and Performance considerations.Equiripple Designs. System Considerations.Options to Improve System Performance. FiniteArithmeticWindow Designs and Performanceconsiderations. Equiripple Designs. SystemConsiderations. Options to Improve SystemPerformance. Finite Arithmetic.
5. Digital Baseband T ransmission. TheNyquist Filter, Excess Bandwidth, MatchedFilters, Square-Root Nyquist Filter, Shaping andUp-Sampling Filters.
6. Pre-and Post-Signal Conditioning.Analog Filters, Timing Jitter, Direct DigitalSynthesizers, CORDIC processors, DigitalOscillators, Interpolating and Decimating Filters inA-to-D and D-to-A, AGC, DC Canceling, I-QBalancing.
7. Sigma-Delta Converters. A-to-D, D-to-A,D-to-D. Multi-loop Converters, Wide-BandConverters. System Considerations.
8. Carrier Centered Modulation andDemodulation. Shaping and Interpolation,QPSK, QAM, Digital IF Options, OFDM, LegacyAnalog modulation and Demodulation in DSP. FMModulation and demodulation.
9. Synchronization. The Phase LockedLoop, Proportional plus Integral Loops, PhaseRecovery, Band Edge Filters in FrequencyRecovery, Timing Recovery, Polyphase Filters inTiming Recovery.
10. Adaptive Filters. LMS Algorithm, RLSAlgorithm, Lattice Filters, Linear Equalization,Adaptive Equalization, Decision FeedbackEqualizers, Constant Modulus (Blind) Equalizers.
11. Modem Structures. Wireline, Cable,Satellite, and Terrestrial modems andconsiderations.
SummaryThis four-day course is designed for
communication systems engineers,programmers, implementers and managers whoneed to understand current practice and nextgeneration DSP techniques for upcomingcommunication systems. DSP is more thanmapping legacy analog designs to a DSPimplementation. To avoid compromise solutionappropriate for an earlier time period, we return tofirst principles to learn how to apply new
technology capabilities tothe design of nextgeneration communicationsystems.
Students will receive acopy of the instructor’snew textbook, MultirateSignal Processing forCommunication Systems,published by Prentice Hall.
Advanced Topics in Digital Signal ProcessingAn Examination of DSP in Modern Fourth Generation Modems
InstructorDr. fred harris teaches at San Diego State
University where he occupies the CUBIC SignalProcessing Chair. His teaching andresearch areas include Digital SignalProcessing, Multirate SignalProcessing, Communication Systems,Source Coding and Modem Design. Hehas extensive practical experience incommunication systems, high
performance modems, sonar and advanced radarsystems and high performance laboratoryinstrumentation. He holds a number of patents onMultirate Signal Processing for Satellite and CableModems and lectures throughout the world on DSPapplications. Dr. harris recently published a textbookthrough Prentice Hall entitled Multirate SignalProcessing for Communication Systems. He consultsfor organizations requiring high performance, cost-effective DSP solutions.
What You Will Learn• How to size and design filters for a specified
processing task• Effects of Finite Arithmetic on Different Filter
Architectures• Understand Multi-rate Signal processing for Sample
Rate Changes• Understand Multi-rate Signal processing for
Intentional Aliasing• DSP Based Signal Enhancement and Signal
Conditioning • DSP Based Synchronization Techniques• Limitations and Boundaries of DSP Based Solutions.
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What you will Learn• How to Size and Design Efficient Digital Filters • Effects of Finite Arithmetic on Different Filter
Architectures • Understand Multirate Signal processing for Sample Rate
Changes• Understand Multirate Signal processing for Intentional
Aliasing• DSP Based Signal Enhancement and Signal Conditioning• DSP Based Synchronization Techniques• Limitations and Boundaries of DSP Based Solutions
Topics• Digital Filters• Channelizers• Filter Design Techniques• Digital Baseband Transmission• Pre and Post Signal Conditioning• Sigma-Delta Converters• Carrier Centered Modulation and Demodulation• Synchronization• Adaptive Filters• Modem Structures
What the Customer Expects
It all Started with….
Regenerative Receiver
TRF: Tuned Radio Frequency
Note Real Breadboard
Superheterodyne
Patent Disclosure: June 3, 1918
Receiver Requires Copy of Carrier
x(t)
A cos( t)cos( t+ (t))
cos( (t))
sign[cos( t)]
N(t)
Low Pa ss Filte r
Idea lChannel
x(t)
A cos( t)
Low Pa ss Filte r
Idea lChannel
m
Sign
N(t)
A x(t)+ (t)NI2
[A+ A m x(t) + (t)] NI2
A2
95% energy in ca rrier
( ) 2
Carrier Recovery PLL
Harry Nyquist (1889-1960)
fS>BWThe Sampling Theorem
Analog to Digital Converter
The Modern EraADC and DSP Insertion
IF Sampling
Timing Correction in DSP Land
Digital Receiver: Asynchronous Carrier and Sampling Clock
DSP Based Receiver
Pa ra lle l to Se ria l
Ma ppingAlgorithm
Polyphase Ma tched Filter 40-to-1
Polypha seDownsample Filter 4-to-1
Polyphase Deriva tive Ma tched Filte r
PolyphaseBa nd-Edge Filter
Timing Loop
AGCControl
Equa lize r 2-to-1 Downsa mple
LMSAlgorithm
Signa l PresentDe tector
CarrierLoop Filte r & DDS
Detector
Ana logBa nd Pa ss Filter
10-BITADC
Sta te Machine
QPSK/QAM
ControlSigna ls
Ouput Da ta0.25/0.5/1.0 MB/S Bina ry
Symbols125/250/500 Kwords/sec
Detected Symbols125 K sym/sec
250 KS/S
125 KS/S
40.0 MS/S
10.0 MS/S
CenterFrequency Se lection
VGA
-
*
Polyphase Multichannel Receiver
IFSTAGE
ADC
PHASE-1
PHASE-39
PHASE-0
TIMINGRCVRY
VCO PHASEROTATORS
80-PNT Rea l FFT
or 40-PNTComplex FFT
PHASE-2
PHASE-38
Channel Select andProcess
fsfc
......
......
...
......
......
...
......
......
...
Time Series: 40-Channel Polyphase Filter Bank
010
2030
4050
6070
8090
100
0
5
10
15
20
25
30
35
40
0
0.2
0.4
0.6
0.8
tim e
c e nte r fre que nc y
mag
nitu
de
Polyphase Channelize1-Wideband and 7-Narrowband CDMA Signals
-6 -4 -2 0 2 4 6-100
-80
-60
-40
-20
0
S pectra ups ampled to 15.36 MHz and up converted in polyphas e filter
Frequency (MHz)
Log-
Mag
(dB
)
-2 0 2-100
-80
-60
-40
-20
0
S pectrum: S -1 at 6.144 MHz
-2 0 2-100
-80
-60
-40
-20
0
S pectrum: S -2 at 6.144 MHz
-2 0 2-100
-80
-60
-40
-20
0
S pectrum: S -3 at 6.144 MHz
-2 0 2-100
-80
-60
-40
-20
0
S pectrum: S -4 at 6.144 MHz
-2 0 2-100
-80
-60
-40
-20
0
S pectrum: S -5 at 6.144 MHz
Related Publicationsf.j harris,
“On the Relationship Between Multirate Polyphase FIR Filters and Windowed, Overlapped FFT Processing”, Twenty-third Annual Asilomar Conference on Signals and Computers, 1989.
• D. Elliot, Editor,“Handbook of Digital Signal Processing: Engineering Applications”,
Academic Press, 1987, Chapter 8, “Time Domain Signal Processing with the DFT”, pp 639-666.
•f.j. harris and M. Rice,“Multirate Digital Filters for Symbol Timing Synchronization in Software Defined Radios”, IEEE Journal on Selected Areas in Communications, Vol. 19, pp. 2346-2357, Dec. 2001.
•f.j. harris, C. Dick, and M. Rice,“Digital Receivers and Transmitters Using Polyphase Filter Banks for Wireless
Communications”, IEEE Microwave Theory and Techniques, Vol. 51, No. 4, April 2003, pp.1395-1412