The system of CDMA needs a much precise time stamp on every piece of the signal. Mostly ten or eight separate calls are generated out in the particular space of channel as a single analog call. The spread spectrum techniques such as frequency hopping and direct sequence are the popular ones used as communication channels.
Frequency hopping is the simple idea that transmits the data over a widely broad spectrum. The frequency can be instantly switched from one circuit to another. The receiver and transmitter are synchronized for every duration with an accurate clock system and pseudo generator system which makes the frequency hopping a very unique and simple one. The direct sequence is the popular spectrum method where the data signal is reproduced by a code of pseudo-random noise.
A pseudo-random noise is sequence chunks which are represented as values of 1 and -1 or it can also be 1 or 0 that is polar or non-polar. The numerous chips that lie within the code are called a code period. The digitalized data can be coded directly with higher frequency and that code can be generated in a pseudo-random method. The receiver can be used to produce the same code which relates the obtained signal to extract the data.
The usage of CDMA throws many advantages which became the main reason to be adopted by 3G mobile telecommunications. The above figure shows that one channel is operated in one direction and the signal transmission consists of the following steps:. The modulated carrier signal is amplified and broadcasted, and the signal reception also involves the following steps:. CDMA technology in mobile communication possesses so many advantages.
The following advantages are a few of them:. Improvement in capacity and security : One of the chief claims of CDMA is that it gives significant improvements in network capacity. In CDMA technology data and voice packets are separated using codes, and then transmitted by using a wide range of frequencies. Because more space is allocated for data in CDMA, this standard has become attractive for 3G high-speed mobile internet use.
In case of this, old link is to be broken when the new one is firmly established. CDMA technology has been used in 3G telecommunication systems in one form or the other.
CDMA has become successful in every aspect, and it has enabled improvements need to be gained over the previous technologies used in 2G systems. This article is all about the CDMA technology and its applications.
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This theoretical model explains how networks behave within an orderly, seven-layered Skip to content CDMA, or Code Division Multiple Access, is a digital cellular phone technology that uses spread spectrum wireless networking technologies. Between eight and 10 separate calls can be carried in the same channel space as one analog AMPS call.
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