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What is The Meaning Code Division Multiple Access -CDMA, FDMA & TDMA

What is The Meaning Code Division Multiple Access -CDMA, FDMA & TDMA What is The Meaning Code Division Multiple Access -CDMA, FDMA & TDMA

Code Division Multiple Access CDMA

What is The Meaning Code Division Multiple Access -CDMA

Code-division multiple access is a channel access method used by various radio communication technologies.

CDMA is an example of multiple access, where several transmitters can send information simultaneously over a single communication channel.

This allows several users to share a band of frequencies

Code Division Multiple Access (CDMA) technologies


Multiple Access: 

The concept behind multiple access is to permit a number of users to share a common channel. The two traditional ways of multiple access are Frequency Division Multiple Access (FDMA) and Time Division Multiple Access (TDMA).

Code Division Multiple Access CDMA

FDMA: frequency division multiple access

In Frequency Division Multiple Access, the frequency band is divided into slots. Each user gets one frequency slot. assigned that is used at will.

It could be compared to AM or FM broadcasting radio where each station has a frequency assigned. FDMA demands good filtering.

TDMA: time division multiple access

In Time Division Multiple Access, the frequency band is not partitioned but users are allowed to use it only in predefined intervals of time. one at a time. Thus TDMA demands synchronization among the users.

CDMA: Code Division Multiple Access (CDMA)

CDMA, for Code Division Multiple Access, is different than those traditional ways in that it does not allocate frequency or time in user slots but gives the right to use both to all users simultaneously. To do this, it uses a technique known as Spread Spectrum.

In effect, each user is assigned code can recover it at the receiver end. This method has the property that the unwanted signals with different codes get spread even more by the process, making them like noise to the receiver.

Advantages of CDMA 2000- Code Division Multiple Access (CDMA)


  • CDMA 2000 benefited from the extensive experience acquired through several years of operation of CDMA-One systems. As a result. CDMA 2000 is a very efficient and robust technology. Supporting both voice and data, the standard was devised and tested in various spectrum bands, including the new IMT-2000 allocations.
  • There is a tremendous demand for new services and operators are looking to provide these to many more subscribers at reasonable prices.
  • Due to its optimized radio technology, CDMA 2000 enables operators to invest in fewer cell sites and deploy them faster, ultimately allowing the service providers to increase their revenues with faster Return on Investment (ROI). Increased revenues, along with a wider array of services, make CDMA2000 the technology of choice for services providers.
  • Other advantages of CDMA technology are increased Voice Capacity, Higher Data Throughput, Increased Battery Life, synchronization, Transmit Diversity.

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NEtechy: What is The Meaning Code Division Multiple Access -CDMA, FDMA & TDMA
What is The Meaning Code Division Multiple Access -CDMA, FDMA & TDMA
What is The Meaning Code Division Multiple Access -CDMA, FDMA & TDMA What is The Meaning Code Division Multiple Access -CDMA, FDMA & TDMA
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