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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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
Course Outline
communication systems. DSP is more than
1. Introduction. An examination of Past,
mapping legacy analog designs to a DSP
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
3. Channelizers. Modulation and
systems.
Demodulation. Design Techniques. Workload
Students will receive a
Comparisons.
copy of the instructor’s
4. Filter Design T echniques. Window
new textbook, Multirate
Designs and Performance considerations.
Signal Processing for
Equiripple Designs. System Considerations.
Communication Systems,
Options to Improve System Performance. Finite
published by Prentice Hall.
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.
5. Digital Baseband T ransmission. The
University where he occupies the CUBIC Signal
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,
6. Pre-and Post-Signal Conditioning.
Source Coding and Modem Design. He
Analog Filters, Timing Jitter, Direct Digital
has extensive practical experience in
Synthesizers, CORDIC processors, Digital
communication systems, high
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
7. Sigma-Delta Converters. A-to-D, D-to-A,
Modems and lectures throughout the world on DSP
D-to-D. Multi-loop Converters, Wide-Band
applications. Dr. harris recently published a textbook
Converters. System Considerations.
through Prentice Hall entitled Multirate Signal
8. Carrier Centered Modulation and
Processing for Communication Systems. He consults
Demodulation. Shaping and Interpolation,
for organizations requiring high performance, cost-
effective DSP solutions.
QPSK, QAM, Digital IF Options, OFDM, Legacy
Analog modulation and Demodulation in DSP. FM
What You Will Learn Modulation and demodulation.
9. Synchronization. The Phase Locked
• How to size and design filters for a specified
processing task Loop, Proportional plus Integral Loops, Phase
Recovery, Band Edge Filters in Frequency
• Effects of Finite Arithmetic on Different Filter
Architectures Recovery, Timing Recovery, Polyphase Filters in
Timing Recovery.
• Understand Multi-rate Signal processing for Sample
10. Adaptive Filters. LMS Algorithm, RLS
Rate Changes
• 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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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
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
c os(t+ (t))
A c os(t)
N(t)
m
x(t) L Pa ss
ow
Ide a l
Filte r
Cha nne l
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

Carrier Recovery PLL

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

Analog to Digital Converter

The Modern Era
ADC and DSP Insertion

IF Sampling

Timing Correction in DSP Land

Digital Receiver: Asynchronous
Carrier and Sampling Clock

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

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

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
80
10
70
60
50
5 40
c e nte r fre que nc y 30
20
0 10
0
tim e

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)

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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