Spread spectrum radio
Trải phổ SPREAD SPECTRUM
... FHSS Ví dụ Direct Sequence Spread Spectrum Transmitter Direct Sequence Spread Spectrum Transmitter Direct Sequence Spread Spectrum Using BPSK Example Approximate Spectrum of DSSS Signal Phổ ... Direct Sequence Spread Spectrum (DSSS) Mỗi bit thể hiện bằng một chuỗi bit theo mã trải Mã trải trải tín hiệu
Ngày tải lên: 13/09/2012, 11:16
Lecture 4 - Spread Spectrum Technologies
... 19 Direct Sequence Spread Spectrum ● Spread spectrum increases the bandwidth of the signal compared to narrow band by spreading the signal. ● There are two major types of spread spectrum techniques: ... Reserved 3 Spread Spectrum ● Spread spectrum is a communication technique that spreads a narrowband communication signal over a wide range of frequencies for transmi...
Ngày tải lên: 13/09/2012, 11:16
Multi-Carrier and Spread Spectrum Systems
... multi-carrier, spread spectrum and multi-carrier spread spectrum systems. We hope that this book will contribute to a better understanding of the principles of multi-carrier and spread spectrum and ... 30 1.3 Spread Spectrum Techniques 30 1.3.1 Direct Sequence Code Division Multiple Access 34 1.3.2 Advantages and Drawbacks of DS-CDMA 37 1.3.3 Applications of Spread Spectrum...
Ngày tải lên: 02/03/2013, 16:58
Tài liệu Spread Spectrum (SS) pptx
... requiring spread spectrum modulation: DSSS (Direct Sequence Spread Spectrum) and FHSS (Frequency Hopping Spread Spectrum) . Only the RF transmission has significant presence in the market. 1Mbps Spreading d t pn t DBPSK 11 ... (Small and Medium Organisations) interested in Spread Spectrum. These notes were used to introduce the SMO’s in the subject of Spread Spectrum. This Sp...
Ngày tải lên: 13/12/2013, 00:15
Tài liệu PRINCIPLES OF SPREAD-SPECTRUM COMMUNICATION SYSTEMS ppt
... concise but lucid explanation and deriva- tion of the fundamentals of spread- spectrum communication systems. Although spread- spectrum communication is a staple topic in textbooks on digital com- munication, ... Networks 6.7 Problems 6.8 References 7 Detection of Spread- Spectrum Signals 387 7.1 Detection of Direct-Sequence Signals 387 387 390 398 398 401 401 407 408 Ideal Detection...
Ngày tải lên: 20/01/2014, 06:20
Tài liệu Mutual Interference In Fast-frequency-hopped, Multiple-frequency-shift-keyed, Spread-spectrum Communication Satellite Systems pdf
Ngày tải lên: 19/02/2014, 14:20
Define Radio Frequency Identification (RFID)
... a radio circuit creates the waves – The number of times a cycle occurs within one second • Cycle – Composed of one top [positive] and one bottom [negative] peak • Carrier signal – Sent by radio ... receiver or transmitter • Electrical current moves the antenna – At the same frequency as the radio waves 28 Frequency (continued) 29 Analog Modulation • Representation of analog informatio...
Ngày tải lên: 13/09/2012, 10:52
List the components of a radio system
... components of a radio system • Describe how different factors affect the design of a radio system • Explain the radio frequency spectrum Wireless Communications Understanding Radio Frequency ... transmissions to be mixed using the same frequency 28 Radio Frequency Spectrum (continued) 14 Multiple Access (continued) 29 Radio Frequency Spectrum (continued) 15 Multiple Access...
Ngày tải lên: 13/09/2012, 10:52
Radio Link Design
... ‘‘ 0’’ . QPSK introduces four states, each phase representing a symbol comprising of 2-bits of Radio Link Design 163 Figure 5.14 Comparison of: (a) ASK; (b) FSK; and (c) PSK. information (i.e. ... the range 10 25 –10 210 , depending on the application and the required integrity of the data. Radio Link Design 165 Figure 5.17 PSK demodulator. are considered. This is followed by a descriptio...
Ngày tải lên: 14/09/2012, 11:26