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
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...
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...
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...
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...
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...
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...
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...