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What is Code Division Multiple Access (CDMA)

Chapter 23
Handbook of Research on Wireless Security
CDMA is also a 2.5G technology offering codes for multiplexing various cell calls. Therefore it does not divide the channel into time slots (time domain multiple access [TDMA]) or frequency bands (frequency division multiple access [FDMA]). Instead, CDMA encodes data with codes associated with every channel; therefore they do not have any overlaps in time or frequency bands. CDMA is a major improvement in cellular technologies.
Published in Chapter:
End-to-End Security Comparisons Between IEEE 802.16e and 3G Technologies
Sasan Adibi (University of Waterloo, Canada) and Gordon B. Agnew (University of Waterloo, Canada)
Copyright: © 2008 |Pages: 15
DOI: 10.4018/978-1-59904-899-4.ch023
Abstract
Security measures of mobile infrastructures have always been important from the early days of the creation of cellular networks. Nowadays, however, the traditional security schemes require a more fundamental approach to cover the entire path from the mobile user to the server. This fundamental approach is so-called end-to-end (E2E) security coverage. The main focus of this chapter is to discuss such architectures for IEEE 802.16e (Mobile-WiMAX) and major third generation (3G) cellular networks. The E2E implementations usually contain a complete set of algorithms, protocol enhancements (mutual identification, authentications, and authorization), including the very large-scale integration (VLSI) implementations. This chapter discusses various proposals at the protocol level.
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Chapter 69
Evolution of TD-SCDMA Networks
A kind of multi-access method; users are distinguished in code domain. Other well-known multiple access methods are FDMA (frequency division multiple access), in which frequencies are used to distinguish different users, and TDMA (time division multiple access), in which time is used to distinguish different users.
Published in Chapter: Evolution of TD-SCDMA Networks; From: Encyclopedia of Multimedia Technology and Networking, Second Edition
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Chapter 17
Modern Crypto Systems in Next Generation Networks: Issues and Challenges
Code Division Multiple Access employs spread-spectrum technology and a special coding scheme in which each transmitter is assigned a code to allow multiple users to be multiplexed over the same physical channel.
Published in Chapter: Modern Crypto Systems in Next Generation Networks: Issues and Challenges; From: Handbook of Research on Digital Crime, Cyberspace Security, and Information Assurance
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Chapter 9
Energy Aware Routing Strategies for an Evolving Wireless Sensor Network: A Survey
The method that is used in shared medium networks in order to avoid collision. Users in these networks share a band of frequencies.
Published in Chapter: Energy Aware Routing Strategies for an Evolving Wireless Sensor Network: A Survey; From: Handbook of Research on Wireless Sensor Network Trends, Technologies, and Applications
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Chapter 3
The Environmental Impact of 5G Technology on Humans and Animals
It is a channel access method used by various radio communication technologies.
Published in Chapter: The Environmental Impact of 5G Technology on Humans and Animals; From: Handbook of Research on Knowledge and Organization Systems in Library and Information Science
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Chapter 5
Radio over Fiber for Broadband Communications: A Promising Technology for Next Generation Networks
A spread spectrum modulation technique and multiple access scheme as well, where each user or terminal is assigned a different (spreading) codeword.
Published in Chapter: Radio over Fiber for Broadband Communications: A Promising Technology for Next Generation Networks; From: Handbook of Research on Heterogeneous Next Generation Networking: Innovations and Platforms
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