CDMA and GSM

cdma and gsm

 

What is CDMA technology?

cdma and gsm. CDMA is one of the technologies used in mobile phones and mobile network, and CDMA stands for Code-Division Multiple Access.

CDMA technology is an example of multiple access, as this technology makes it easier for multiple sending devices to transmit any information at the same time using only one communication channel.

 

CDMA uses spread spectrum technology and a special encryption scheme by assigning a specific code to each sender.

 

CDMA is the technology competing with the cellular phone service technology known as GSM, which is considered the most widespread and used around the world.

 

During the design of phones, a network operator is added, and either this network operator supports CDMA technology or GSM technology, but a phone cannot support both technologies at the same time.

 

CDMA technology is an American technology designed by the American telecommunications company Qualcomm, and therefore CDMA technology is mainly used in the United States of America and some Asian countries in some operators of this service.

 

How does CDMA technology work?

 

CDMA technology uses spread spectrum technology by spreading waves of electromagnetic energy to allow the signal to travel more widely and within the limits of the frequency range.

 

Using CDMA technology, data, and voice packets are separated using a set of symbols and then sent using a wide bandwidth, as more space is allocated to the data in this technology.

 

 

Advantages of CDMA technology

 

1. Transmit voice and data clearly and in high quality, and there are no sources of interference that affect the quality of calls.
2. Accurate calls and reduce the percentage of missed calls by 15% compared to GSM cellular technology.
3. A secure technology that provides high privacy and double protection from any illegal leakage of data or user calls.
4. A health-safe technology, as the frequency signals it emits are very low. Therefore, the use of this technology is completely safe and does not cause any harmful radiation to human health.
5. Reduce battery consumption of cell phones.

 

What is the difference between CDMA technology and GSM technology?

The difference between cdma and gsm will be clarified by comparing the two technologies at several important points, as shown below:

 

First: in terms of coverage

Although CDMA technology has the advantage of higher bandwidth, GSM technology is much superior in terms of wide coverage, as it has more comprehensive international coverage for international roaming, and GSM technology also covers rural areas more widely than CDMA.

GSM network technology is used in more than 80% of mobile phone networks in the world, while CDMA technology is mainly used in the United States of America, Canada, and Japan.

 

Second: In terms of compatibility between mobile devices and SIM cards

In phones that support CDMA, you cannot transfer your information, including your phone number and contacts, to another phone, even if you are using a SIM card, as you need permission from your network operator to transfer your data from one phone to another when swapping phones, for example.

  The reason for this is that CDMA networks store user information on the network operator itself and not on SIM cards. While GSM technology uses SIM cards to store user information.

  Therefore, SIM cards on GSM networks are interchangeable, as you can change your phone that supports GSM technology to another phone that also supports GSM. You just transfer the SIM card to the new phone and all your data will be transferred, including the phone number and others, and this is not available in CDMA technology.

 

Third: In terms of sending voice and data

In CDMA network technology, it is not possible to send voice and data at the same time. Therefore, because of this, you may receive a lot of mail messages and other Internet notifications immediately after ending your call in CDMA networks. The process of sending data also takes place after ending the phone call.

 

Fourth: In terms of bandwidth

CDMA network technology operates in the 850 MHz and 1900 MHz frequency bands, and the GSM network also operates in the 850 MHz and 1900 MHz frequency bands.

Read Also: Security Apps for Smartphones 

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