PQDD(ProQuest Digital Dissertations)是由美国Bell& Howell信息学术公司Bll Howell Information and learning,原为UM公司)提供的“国际学位论文文摘”数据库的 web版。它是目前世界上独一无二的最具权威性的博士、硕士学位论文检索数据库,主要 收录来自美国、加拿大和欧洲1000多所大学的博、硕士论文的题录、文摘共160余万 篇,其中100多万篇有印刷型或缩微型原文收藏。该数据库每周更新一次数据,每年大约 新增47000篇博土论文和12000篇硕士论文
Linear Transversal Equalizers Nonlinear Equalizers. Linear 70.3 Receivers. Nonlinear Receivers 70.3 Spread Spectrum Communications Brief History Why Spread Spectrum? Basic Concepts and M. K. Simon Terminology. Spread Spectrum Techniques. Applications of Jet Propulsion Laboratory Spread Spectrum 70.1 Error Control Coding Richard C. Dorf and Zhen Wan Error correcting codes may be classified into two broad categories: block codes and tree codes. A block code
74.1Introduction 74.2 Satellite Applications 74.3 Satellite Functions 74.4 Satellite Orbits and Pointing Angles 74.5 Communications Link 74.6 System Noise Temperature and G/T 74.7 Digital Links 74.8Interference 74.9 Some Particular Orbits 74.10 Access and Modulation Daniel F. DiFonzo
69 Broadcasting R.C. Dorf, Z. Wan, J.F. Lindsey I, D.F. Doelitzsch, J. Whitaker, M.S. Roden, S. Salek, A. H. Clegg Modulation and Demodulation. Radio. Television Systems. High-Definition Television. Digital Audio Broadcasting
84.1 Introduction 84.2 The Analog and Digital Signal Interface 84.3 Analog Signal Conditioning 84.4 Sample-and-Hold and A/D Techniques in Data Acquisition
It may here be taken for grantedthat since the second half of the 20th century the Information Society may now be considered as running parallel to the 19th century Industrial Society. One of the striking effects of this development particularly made possible by the spread of digital technology is the commodification of information