• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 37
  • 10
  • 5
  • 4
  • 4
  • 2
  • 1
  • 1
  • Tagged with
  • 67
  • 67
  • 15
  • 15
  • 14
  • 14
  • 13
  • 11
  • 10
  • 9
  • 9
  • 8
  • 8
  • 8
  • 7
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Single-user and multi-user modulation and detection methods for mobile communications

Wei, Lei. Unknown Date (has links)
Thesis (PhD)--University of South Australia, 1994.
2

Single-user and multi-user modulation and detection methods for mobile communications /

Wei, Lei. Unknown Date (has links)
Thesis (PhD)--University of South Australia, 1994.
3

Universal carrier recovery for digital amplitude-phase-keyed signals

Moss, James Francis. January 1980 (has links)
Thesis (M.S.)--University of Wisconsin--Madison, 1980. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 65-68).
4

Advanced practical coding and modulation techniques for time varying channels

Horley, Niall January 1996 (has links)
No description available.
5

Novel high-speed optical transmitters for optical frequency shift keying and inverse-return-to-zero signals.

January 2005 (has links)
Pun Siu Sun. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2005. / Includes bibliographical references (leaves 55-58). / Abstract in English and Chinese. / ABSTRACT --- p.ii / 摘要 --- p.iv / Chapter 1 --- BLACKGROUND AND INTRODUCTION --- p.1 / Chapter 1.1 --- OPTICAL FREQUENCY SHIFT KEYING (FSK) --- p.1 / Chapter 1.1.1 --- Basic concepts --- p.1 / Chapter 1.1.2 --- Applications --- p.3 / Chapter 1.2 --- MODULATION FORMATS --- p.6 / Chapter 1.3 --- ORTHOGONAL MODULATION --- p.9 / Chapter 1.4 --- THESIS ORGANIZATION --- p.11 / Chapter 2 --- A NOVEL OPTICAL FREQUENCY SHIFT KEYING TRANSMITTER BASED ON POLARIZATION MODULATION --- p.12 / Chapter 2.1 --- EXISTING OPTICAL FSK TRANSMITTER DESIGNS --- p.12 / Chapter 2.1.1 --- Optical FSK transmitter based on complementary intensity modulation --- p.12 / Chapter 2.1.2 --- Optical FSK transmitter based on direct modulation in a DFB laser --- p.13 / Chapter 2.1.3 --- Optical FSK transmitter based on single side-band (SSB) modulation technique --- p.15 / Chapter 2.1.4 --- Optical Continuous-Phase FSK (CPFSK) transmitter based on asymmetric Mach-Zehnder modulator --- p.17 / Chapter 2.1.5 --- Optical FSK transmitter based on phase modulation --- p.18 / Chapter 2.1.6 --- Summary --- p.20 / Chapter 2.2 --- PROPOSED OPTICAL FSK TRANSMITTER BASED ON POLARIZATION MODULATION --- p.21 / Chapter 2.3 --- EXPERIMENTAL DEMONSTARTION --- p.23 / Chapter 2.4 --- SYSTEM PERFORMANCE --- p.25 / Chapter 2.5 --- SUMMARY --- p.27 / Chapter 3 --- OPTICAL RETURN-TO-ZERO FREQUENCY SHIFT KEYING (RZ-FSK) (RZ-FSK) --- p.28 / Chapter 3.1 --- INTRODUCTION AND MOTIVATION --- p.28 / Chapter 3.2 --- PREVIOUS NRZ vs. RZ COMPARISON --- p.30 / Chapter 3.3 --- RZ-FSK TRANSMITTER DESIGN --- p.32 / Chapter 3.4 --- PERFROMANCE COMPARISON --- p.33 / Chapter 3.4.1 --- Back-to-back performance --- p.34 / Chapter 3.4.2 --- Chromatic dispersion tolerance --- p.35 / Chapter 3.4.3 --- Fiber nonlinearity tolerance --- p.38 / Chapter 3.5 --- SUMMARY --- p.41 / Chapter 4 --- A NOVEL OPTICAL TRANSMITTER FOR HIGH-SPEED DIFFERENTIAL PHASE SHIFT KEYING/INVERSE RETURN-TO-ZERO (DPSK/INV-RZ) ORTHOGONALLY MODULATED SIGNALS --- p.42 / Chapter 4.1 --- INTRODUCTION --- p.42 / Chapter 4.2 --- PREVIOUS SCHEME --- p.43 / Chapter 4.3 --- PROPOSED TRANSMITTER DESIGN --- p.45 / Chapter 4.4 --- EXPERIMENT AND RESULTS --- p.47 / Chapter 4.5 --- CONCLUSION --- p.51 / Chapter 5 --- SUMMARY --- p.52 / Chapter 5.1 --- THESIS SUMMARY --- p.52 / Chapter 5.2 --- FUTURE WORK --- p.53 / LIST OF PUBLICATIONS --- p.54 / REFERENCES --- p.55
6

A hardware based Ricean fading radio channel simulator

Badawy, Ahmed Mohamed H. January 2010 (has links) (PDF)
Thesis (MS)--Montana State University--Bozeman, 2010. / Typescript. Chairperson, Graduate Committee: Richard Wolff. Includes bibliographical references (leaves 103-105).
7

A study of the minimum shift keying modulation scheme

Aldera, Mario Antonio January 1988 (has links)
This thesis concerns itself with the study of the Minimum Shift Keying (MSK) modulation scheme. The aspects considered are its operation under non-linear conditions as well as an investigation into the hardware implementation of both coherent and non-coherent MSK modems. The literature on digital data transmission and MSK in particular is surveyed, and a comprehensive theoretical description of MSK is given. In addition, papers on the operation of MSK under non-linear conditions were studied, and their major findings are presented. Due to the lack of theory on the effects of incorrect modulation index on the error performance of MSK, an investigation into this avenue was performed. The design of a correction mechanism for maintaining the modulation index at its correct value is described, and aspects of its implementation are considered. Using the available literature, various modules of which a coherent MSK modem is comprised were developed, and their design is discussed. The design of a non-coherent MSK demodulator is also described.
8

A Transceiver System Using the Human Body as Transmission Channel

Huang, Yuah-tse 14 August 2009 (has links)
This thesis consists of two subjects of research: A Digital Modulation bit error rate study for transmission using the human body as the transmission channel, and signal coupling using a piezo transducer. The first topic involves studying several kinds of Digital Modulation and application; the transceiver is implemented using LabView. The interface for transmission uses Piezo film transducers. A high pass filter is used to remove noise and interference. The bit error rate using Manchester-coding is measured. A brief discussion is presented justifying the choice of On-Off Keying (OOK) modulation to transmit data on the human body. The second topic is a study on the design and implementation of a human body transmission system. A test chip is designed in TSMC 0.35£gm 2P4M CMOS process and first measured results are presented.
9

Multiple trellis coded 16 QAM.

January 1994 (has links)
by Kingsley, King-chi, Kwan. / Thesis (M.Phil.)--Chinese University of Hong Kong, 1994. / Includes bibliographical references (leaves 85-88). / Tables of Contents / Lists of Figures & Tables / Acknowledgments / Abstract / Chapter Chapter 1 --- Introduction / Chapter 1.1 --- Digital Communication System --- p.P. 1 / Chapter 1.2 --- Channel Coding --- p.P. 1 / Chapter 1.3 --- Convolution Encoder --- p.P. 4 / Chapter 1.4 --- Additive White Gaussian Noise (AWGN) Channel --- p.P. 7 / Chapter 1.5 --- Trellis Diagram --- p.P. 8 / Chapter 1.6 --- Error Event and Free Distance --- p.P. 8 / Chapter 1.7 --- Euclidean Distance --- p.P. 10 / Chapter 1.8 --- Organization of the Thesis --- p.P. 11 / Chapter Chapter 2 --- QAM and MTCM / Chapter 2.1 --- Introduction --- p.P. 13 / Chapter 2.2 --- M-ary Quadrature Amplitude Modulation (QAM) / Chapter 2.2.1 --- M-ary Digital Modulation --- p.P. 13 / Chapter 2.2.2 --- Quadrature Amplitude Modulation (QAM) --- p.P. 14 / Chapter 2.2.3 --- Probability of Bit Error of M-ary QAM --- p.P. 16 / Chapter 2.3 --- Trellis Coded Modulation (TCM) --- p.P. 17 / Chapter 2.4 --- Multiple Trellis Coded Modulation (MTCM) --- p.P. 19 / Chapter Chapter 3 --- Set Partitioning of Signal Sets / Chapter 3.1 --- Introduction --- p.P. 21 / Chapter 3.2 --- Traditional Set Partitioning Methods / Chapter 3.2.1 --- Ungerboeck's Set Partitioning Method --- p.P. 21 / Chapter 3.22 --- Set Partitioning by M.K. Simon and D. Divsalvar --- p.P. 23 / Chapter 3.3 --- The new Set Partitioning Method / Chapter 3.3.1 --- Nomenclature of the Signal Points in the Signal Constellations --- p.P. 24 / Chapter 3.3.2 --- Generation of the Signal Sets --- p.P. 26 / Chapter 3.3.3 --- Partitioning of the Signal Sets / Chapter 3.3.3.1 --- Input Constraints of the Partitioning Method --- p.P. 30 / Chapter 3.3.3.2 --- The Set Partitioning Method --- p.P. 30 / Chapter 3.3.4 --- Distance Properties of the Partitioned Signal Sets --- p.P. 36 / Chapter 3.3.5 --- The Selection Scheme --- p.P. 39 / Chapter 3.3.6 --- Assignment of Signal Subsets into Trellis --- p.P. 42 / Chapter Chapter 4 --- Performance Evaluation / Chapter 4.1 --- Introduction --- p.P. 46 / Chapter 4.2 --- Upper Bound of Error Probability / Chapter 4.2.1 --- Probability of Symbol Error --- p.P. 46 / Chapter 4.2.1.1 --- Upper Bound on Probability of Symbol Error --- p.P. 48 / Chapter 4.2.1.2 --- Computation of the Transfer Function --- p.P. 49 / Chapter 4.2.2 --- Probability of Bit Error --- p.P. 51 / Chapter 4.3 --- Computation of the Free Distance --- p.P. 53 / Chapter Chapter 5 --- Results Presentation and Discussions / Chapter 5.1 --- Introduction --- p.P. 58 / Chapter 5.2 --- Results Presentations / Chapter 5.2.1 --- Normalized Square Free Euclidean Distance --- p.P. 58 / Chapter 5.2.2 --- Error Probability --- p.P. 71 / Chapter 5.3 --- Discussions --- p.P. 77 / Chapter Chapter 6 --- Conclusions --- p.P. 83 / Bibliography --- p.P. 85 / Chapter Appendix A - --- Flowchart of the Program --- p.P. 89 / Chapter Appendix B - --- Tabulated Results of d2free --- p.P. 104
10

DSP implementation of trellis coded modulation and distributed space time coding

Tang, Yipeng. January 2001 (has links)
Thesis (M.S.)--West Virginia University, 2001. / Title from document title page. Document formatted into pages; contains v, 118, [64] p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 114-118).

Page generated in 0.0994 seconds