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overview
home > cdma
Code division multiple access (CDMA) is a channel access method utilized by various radio communication technologies. It should not be confused with the mobile phone standards called cdmaOne and CDMA2000 (which are often referred to as simply "CDMA"), that use CDMA as their underlying channel access methods. One of the basic concepts in data communication is the idea of allowing several transmitters to send information simultaneously over a single communication channel. This allows several users to share a bandwidth of frequencies. This concept is called multiplexing. CDMA employs spread-spectrum technology and a special coding scheme (where each transmitter is assigned a code) to allow multiple users to be multiplexed over the same physical channel. By contrast, time division multiple access (TDMA) divides access by time, while frequency-division multiple access (FDMA) divides it by frequency. CDMA is a form of "spread-spectrum" signaling, since the modulated coded signal has a much higher data bandwidth than the data being communicated. Source: Wikipedia (http://en.wikipedia.org/wiki/CDMA)

Here are the best overviews and tutorials for cdma:

overview, 4 stars
CDMA Overview
For radio systems there are two resources, frequency and time. Division by frequency, so that each pair of communicators is allocated part of the spectrum for all of the time, results in Frequency Division Multiple Access (FDMA).

tutorial, 4 stars
Wideband Code Division Multiple Access (W-CDMA)
For a mobile communication system, a key parameter is the system capacity. A number of methods to increase system capacity in a W-CDMA network are discussed. This tutorial presents results from different antenna pattern parameters and sectorization techniques for optimizing the maximum number of active subscribers.

overview, 3 stars
CDMA Web site
This page explains about the main concepts of CDMA, its applications and its history. What is CDMA? Code Division Multiple Access (CDMA) is a digital cellular spread-spectrum modulation technique that implements distributed voice and data networks. CDMA works by converting speech into digital information, which is then transmitted as a radio signal over a wireless network. CDMA does not assign a specific frequency to each...

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