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| Dec 3, 2009 |
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Standards >
Data Transmission Standards >
Modulation Techniques >
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DEFINITION: What is Code-Division Multiple Access (CDMA)?Also see CDMA One, CDMA2000, and W-CDMA. CDMA (Code-Division Multiple Access) refers to any of several protocols used in so-called second-generation (2G) and third-generation (3G) wireless communications. As the term implies, CDMA is a form of multiplexing, which allows numerous signals to occupy a single transmission channel, optimizing the use of available
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CDMA DEFINITION (continued): … bandwidth. The technology is used in ultra-high-frequency (UHF) cellular telephone systems in the 800-MHz and 1.9-GHz bands.CDMA employs analog-to-digital conversion (ADC) in combination with spread spectrum technology. Audio input is first digitized into binary elements. The frequency of the transmitted signal is then made to vary according to a defined pattern (code), so it can be intercepted only by a receiver whose frequency response is programmed with the same code, so it follows exactly along with the transmitter frequency. There are trillions of possible frequency-sequencing codes, which … CDMA definition sponsored by SearchTelecom.com, powered by WhatIs.com an online computer dictionary
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