Advanced Topics In Digital Signal Processing


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Advanced Topics In Digital Signal Processing

  1. 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 349 Berkshire Drive Riva, Maryland 21140 888-501-2100/410-956-8805 Website: Email: ATI@ATIcourses.comATI Course Schedule:’s Advanced Topics In Digital Signal Processing:
  2. 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 or call ATI at 888.501.2100 or 410.956.8805 Vol. 95 – 51
  3. 3. www.ATIcourses.comBoost Your Skills 349 Berkshire Drive Riva, Maryland 21140with On-Site Courses Telephone 1-888-501-2100 / (410) 965-8805Tailored to Your Needs Fax (410) 956-5785 Email: ATI@ATIcourses.comThe Applied Technology Institute specializes in training programs for technical professionals. Our courses keep youcurrent in the state-of-the-art technology that is essential to keep your company on the cutting edge in today’s highlycompetitive marketplace. Since 1984, ATI has earned the trust of training departments nationwide, and has presentedon-site training at the major Navy, Air Force and NASA centers, and for a large number of contractors. Our trainingincreases effectiveness and productivity. Learn from the proven best.For a Free On-Site Quote Visit Us At: Our Current Public Course Schedule Go To:
  4. 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. 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. 6. What the Customer Expects
  7. 7. It all Started with….
  8. 8. Regenerative Receiver
  9. 9. TRF: Tuned Radio Frequency Note Real Breadboard
  10. 10. Superheterodyne Patent Disclosure: June 3, 1918
  11. 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. 12. Carrier Recovery PLL
  13. 13. Harry Nyquist (1889-1960) The Sampling Theorem fS>BW
  14. 14. Analog to Digital Converter
  15. 15. The Modern EraADC and DSP Insertion
  16. 16. IF Sampling
  17. 17. Timing Correction in DSP Land
  18. 18. Digital Receiver: Asynchronous Carrier and Sampling Clock
  19. 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 LMS40.0 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. 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. 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. 22. Polyphase Channelize1-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. 23. 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
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