Advanced Topics In Digital Signal Processing Course Sampler

1. ADVANCED TOPICS IN
DIGITAL SIGNAL PROCESSING
An Examination of DSP in Modern
Fourth Generation Modems
fred harris
San Diego State University
Applied Technology Institute
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Riva, Maryland 21140
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2. Advanced Topics in Digital Signal Processing
An Examination of DSP in Modern Fourth Generation Modems
Summary
This four-day course is designed for
communication systems engineers,
programmers, implementers and managers who
need to understand current practice and next
generation DSP techniques for upcoming
communication systems. DSP is more than Course Outline
mapping legacy analog designs to a DSP 1. Introduction. An examination of Past,
implementation. To avoid compromise solution Present, and Future Digital Modulation Systems.
appropriate for an earlier time period, we return to 2. Digital Filters. FIR Filters, Resampling
first principles to learn how to apply new Filters, Interpolators and Decimators, Half Band
technology capabilities to Filters, Cascade-Integrator-comb (CIC) filters,
the design of next Hogenauer Filters, Multirate IIR filters.
generation communication
systems. 3. Channelizers. Modulation and
Demodulation. Design Techniques. Workload
Students will receive a
Comparisons.
copy of the instructor’s
new textbook, Multirate 4. Filter Design T echniques. Window
Signal Processing for Designs and Performance considerations.
Communication Systems, Equiripple Designs. System Considerations.
published by Prentice Hall. Options to Improve System Performance. Finite
ArithmeticWindow Designs and Performance
considerations. Equiripple Designs. System
Instructor Considerations. Options to Improve System
Dr. fred harris teaches at San Diego State Performance. Finite Arithmetic.
University where he occupies the CUBIC Signal 5. Digital Baseband T ransmission. The
Processing Chair. His teaching and Nyquist Filter, Excess Bandwidth, Matched
research areas include Digital Signal Filters, Square-Root Nyquist Filter, Shaping and
Processing, Multirate Signal Up-Sampling Filters.
Processing, Communication Systems,
Source Coding and Modem Design. He 6. Pre-and Post-Signal Conditioning.
has extensive practical experience in Analog Filters, Timing Jitter, Direct Digital
communication systems, high Synthesizers, CORDIC processors, Digital
performance modems, sonar and advanced radar Oscillators, Interpolating and Decimating Filters in
systems and high performance laboratory A-to-D and D-to-A, AGC, DC Canceling, I-Q
instrumentation. He holds a number of patents on Balancing.
Multirate Signal Processing for Satellite and Cable
Modems and lectures throughout the world on DSP 7. Sigma-Delta Converters. A-to-D, D-to-A,
applications. Dr. harris recently published a textbook D-to-D. Multi-loop Converters, Wide-Band
through Prentice Hall entitled Multirate Signal Converters. System Considerations.
Processing for Communication Systems. He consults 8. Carrier Centered Modulation and
for organizations requiring high performance, cost- Demodulation. Shaping and Interpolation,
effective DSP solutions.
QPSK, QAM, Digital IF Options, OFDM, Legacy
Analog modulation and Demodulation in DSP. FM
What You Will Learn Modulation and demodulation.
• How to size and design filters for a specified 9. Synchronization. The Phase Locked
processing task Loop, Proportional plus Integral Loops, Phase
• Effects of Finite Arithmetic on Different Filter Recovery, Band Edge Filters in Frequency
Architectures Recovery, Timing Recovery, Polyphase Filters in
• Understand Multi-rate Signal processing for Sample Timing Recovery.
Rate Changes 10. Adaptive Filters. LMS Algorithm, RLS
• Understand Multi-rate Signal processing for Algorithm, Lattice Filters, Linear Equalization,
Intentional Aliasing Adaptive Equalization, Decision Feedback
• DSP Based Signal Enhancement and Signal Equalizers, Constant Modulus (Blind) Equalizers.
Conditioning
11. Modem Structures. Wireline, Cable,
• DSP Based Synchronization Techniques
Satellite, and Terrestrial modems and
• Limitations and Boundaries of DSP Based Solutions. considerations.
Register online at www.ATIcourses.com or call ATI at 888.501.2100 or 410.956.8805 Vol. 95 – 51

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4. 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

5. 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

6. What the Customer Expects

7. It all Started with….

8. Regenerative Receiver

9. TRF: Tuned Radio Frequency
Note Real Breadboard

10. Superheterodyne
Patent Disclosure: June 3, 1918

11. Receiver Requires Copy of Carrier
N(t)
Ide a l L Pa ss
ow
x(t)
Cha nne l Filte r
A x(t)+ NI(t)
c os((t))
2
A c os(t) c os(t+ (t))
N(t)
m
x(t) L Pa ss
ow
Ide a l
Cha nne l Filte r
2 [A+ A m x(t) + N (t)]
 I
Sign
A c os(t) sign[c os(t)]
( A )2
2
95% e ne rgy in c a rrie r

12. Carrier Recovery PLL

13. Harry Nyquist (1889-1960)
The Sampling Theorem
fS>BW

14. Analog to Digital Converter

15. The Modern Era
ADC and DSP Insertion

16. IF Sampling

17. Timing Correction in DSP Land

18. Digital Receiver: Asynchronous
Carrier and Sampling Clock

19. DSP Based Receiver
Ana log 10-BIT
B nd Pa ss
a VGA ADC
Filte r
AGC Signa l
Control Pre se nt
De te c tor LMS
40.0 MS/S Algorithm
125 KS/S -
Polypha se Polypha se 250 KS/S 2-to-1
Downsa mple Ma tc he d Equa lize r De te c tor
Down
Filte r Filte r
sa mple
4-to-1 40-to-1
10.0 MS/S Timing
Ca rrie r *
Loop Filte r
L oop
& DDS
Polypha se
De riva tive
Ma tc he d
Filte r
Pa ra lle l
Ma pping Ouput Da ta
Polypha se to
De te c te d Algorithm 0.25/0.5/1.0
B nd-Edge
a B ry
ina Se ria l
Symbols MB /S
Ce nte r Filte r 125 Ksym/se c Symbols
Fre que nc y 125/250/500
Se le c tion QPSK/QAM Kwords/se c
Sta te Ma c hine Control
Signa ls

20. Polyphase Multichannel Receiver
TIMING
RCV RY
PHASE-0
PH -1
ASE
VCO
PHASE
PHASE-2
fc fs ROT T
A ORS
...............
...............
...............
IF Cha nne l
ADC 80-PNT
Se le ct
ST GE
A Re a l
FFT a nd
Proc ess
or
40-PNT
PHASE-38 Comple x
FFT
PH -39
ASE

21. Time Series: 40-Channel
Polyphase Filter Bank
0.8
0.6
m a gnitu de
0.4
0.2
0
40
35
30
25
20
15
100
90
10 80
70
60
5 50
c e nte r fre que nc y 40
30
20
0 10
0
tim e

22. Polyphase Channelize
1-Wideband and 7-Narrowband CDMA Signals
S pectrum: S -1 at 6.144 MHz S pectrum: S -2 at 6.144 MHz S pectrum: S -3 at 6.144 MHz S pectrum: S -4 at 6.144 MHz S pectrum: S -5 at 6.144 MHz
0 0 0 0 0
-20 -20 -20 -20 -20
-40 -40 -40 -40 -40
-60 -60 -60 -60 -60
-80 -80 -80 -80 -80
-100 -100 -100 -100 -100
-2 0 2 -2 0 2 -2 0 2 -2 0 2 -2 0 2
S pectra ups ampled to 15.36 MHz and up converted in polyphas e filter
0
-20
Log-Mag (dB)
-40
-60
-80
-100
-6 -4 -2 0 2 4 6
Frequency (MHz)

23. Related Publications
f.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

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