The working and application of CDMA are briefly explained in this article along with its limitations. Here we discuss an explanation, how to use and how CDMA work with advantages and disadvantages.
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What is CDMA? Login details for this Free course will be emailed to you. Email ID. Contact No. Most people don't need to worry about which cell phone network they choose in terms of which technology is better. However, the two standards do diverge in important technical ways. GSM technology tends to cover rural areas in the U. Instead, you typically need your carrier's permission to perform such a swap.
Those carriers, however, still use CDMA technology to store subscriber information. Most CDMA networks do not allow voice and data transmissions at the same time. This is why you may get bombarded with emails and other Internet notifications when you end a call from a CDMA network like Verizon. The data is basically on pause while you're on a phone call. However, you'll notice that two-way data exchange works just fine on a CDMA network when you're on a phone call within range of a Wi-Fi network because Wi-Fi, by definition, isn't using the carrier's network.
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Types of Spread Spectrum Communications: There are three types of spread spectrum communications:. Frequency hopping is the easiest of all the spread spectrum modulation technique to use. The idea behind frequency hopping is to transmit data across a broad spectrum; the frequency can be rapidly switched from one to another. The transmitter and receiver are synchronized every time, and an accurate clocking system, and pseudo generating system make this frequency hopping very simple.
Direct sequence is the most famous spread spectrum technique in which the data signal is multiplied by a Pseudo-random noise code. A PN code is a sequence of chips which is given values as -1 and 1 non polar or 0 and 1 polar.
The number of chips within one code is known as the period of this code. The digital data is directly coded at higher frequency, and the code is generated pseudo randomly.
A receiver knows how to generate the same code and correlates the received signal with that code to extract the data. 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:. Because only those who speak the same language can understand each other, it is possible for multiple conversations to take place in the room at the same time. The basic concept in CDMA is that users who wish to communicate through it are given a shared code. While multiple codes may occupy the same channel, only those users having the same code can communicate with each other.
Because CDMA and GSM standards each have unique pros and cons, the preferred technology standard choice is now in the hands of potential subscribers. However, the ultimate choice will depend heavily on the availability of these standards within the localities of subscribers. By: Justin Stoltzfus Contributor, Reviewer. By: Satish Balakrishnan. Dictionary Dictionary Term of the Day.
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