Spectral phase encoded time spread optical code division multiple access technology for next generation communication networks [Invited]

2007 ◽  
Vol 6 (10) ◽  
pp. 1210 ◽  
Author(s):  
S. J. Yoo ◽  
J. P. Heritage ◽  
V. J. Hernandez ◽  
R. P. Scott ◽  
W. Cong ◽  
...  
Keyword(s):  
Communication Networks ◽  
Code Division Multiple Access ◽  
Multiple Access ◽  
Spectral Phase ◽  
Next Generation ◽  
Access Technology ◽  
Code Division Multiple ◽  
Time Spread

Orthogonal Frequency Division Multiplexing and Code Division Multiple Access Systems

2021 ◽  
pp. 386-426
Author(s):  
Stevan Berber
Keyword(s):  
Code Division Multiple Access ◽  
Multiple Access ◽  
Intermediate Frequency ◽  
Frequency Division ◽  
Access Technology ◽  
Multicarrier Communication ◽  
Access System ◽  
Non Binary Code ◽  
Code Division Multiple ◽  
Multiple Access System

Chapter 8 presents modern multi-user and multicarrier communication systems based on code division multiple access technology and orthogonal frequency division multiple access technology. Analogue, digital, and discrete orthogonal frequency division multiple access systems are presented separately and then inter-related from theoretical and practical points of view. A precise mathematical model of discrete baseband and intermediate-frequency blocks is presented, including procedures for signal mapping and the discrete Fourier transform, and then related to the model of an analogue radiofrequency block to make the whole orthogonal frequency division multiple access system. The basic theory of binary and non-binary code division multiple access systems operation is presented. To support deeper theoretical understanding of the design and operation of a code division multiple access system, one project in the supplementary material demonstrates the mathematical modelling, simulation, and design of this system in field-programmable gate array technology and presents the development tools required.

RFID Anti-Collision Algorithm Merging Security Mechanism

2011 ◽  
Vol 216 ◽  
pp. 116-119 ◽  
Author(s):  
Song Sen Yu ◽  
Yun Peng ◽  
Jia Jing Zhang
Keyword(s):  
Hash Function ◽  
Code Division Multiple Access ◽  
Multiple Access ◽  
Hot Spot ◽  
Low Cost ◽  
Security Mechanism ◽  
Interference Immunity ◽  
Access Technology ◽  
High Security ◽  
Code Division Multiple

Leading into the Code-Division Multiple Access technology is the new hot spot in RFID research. The CDMA has advantages of high security, interference immunity and so on, Hash function has irreversibility in the bidirectional authentication, we improve CDMA technology and combine with hash operation to resolve RFID anti-collision. The algorithm has high security and low cost, it very adapts to the low-middle RFID system.

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