What is GSM and CDMA?

Difference between GSM and CDMA

GSM stands for Global System for Mobile communication, while CDMA stands for Code Division Multiple Access GSM uses the technology named FDMA and TDMA. In GSM, information in addition as voice each are transmitted at the same time, while CDMA have not this facility.
The main distinction between GSM and CDMA is that GSM is restricted to a SIM card that’s used with the movable. On the opposite hands, the CDMA is French telephone specific.
Different between GSM & CDMA
Diff. between GSM & CDMA
Let’s see that the difference between GSM and CDMA:
1.GSM stands for Global System for Mobile communication.CDMA stands for Code Division Multiple Access.
2.GSM uses the technology named FDMA and TDMA.While it uses the technology CDMA.
3.GSM is in roaming in worldwide.While it is in roaming in limited.
4.GSM has slow data rate.While it has fast data rate.
5.In GSM, information in addition as voice each are transmitted at the same time.While CDMA have not this facility.
6.GSM is specific for SIM.While it is specific for headset or phone.

We all use mobile phones but do you know whether you have mobile GSM or CDMA. After all, what is GSM and CDMA (Difference between GSM and CDMA). Today, mobile phones are being used by crores of people in almost all places in the world. The reality is that mobile phone has changed the definition of communication service. It is one of the fastest growing in the telecommunication industry.

In today's digital world mobile phone is like a boon for humans. But do you know that voice transmission is mainly done in two ways, one is GSM and the other is CDMA technology. Today, in this article, we will get to know about these two technologies GSM and CDMA and how it works. So, let's start delaying and know what GSM and CDMA are and how it works.

What is GSM

The full form of GSM is Global System for Mobiles. This is a worlwide standard digital celluar telephony. GSM was created by Europeans, it was given an published standard status by ETSI in 1982. And later it was used in countries around the world.

GSM technology was first introduced in Finland in 1991. Today, more than 690 mobile networks are providing GSM service in 213 countries. Which means that around 82.4% of the global mobile connection is GSM only. GSM World says that today there are about 2 billion GSM mobile users worldwide. If we talk about the statistics of different countries, the first name in this list comes from China where 370 million users use GSM mobile phone, followed by Russia where 145 Million, and third place is India where 83 Millions of people use it.

Features of GSM Technology.

If we talk about the features of GSM technolgy, then there are many features of it which I have mentioned below so that you can understand it easily.

  • GSM Phone is a digital cellular technolgy that is used to transmit or send mobile voice and data services.
  • In GSM, narrow band Time Division Multiple Access (TDMA) technique is used to transmit signals.
  • A circuit-switched is used which divides all 200kHz channels into 8 25kHz time slots.
  • GSM network mainly operates in mobile communication bands of 900MHz and 1800MHz all over the world.
GSM Network mainly consists of three parts: the Switching System (SS), the Base Station System (BSS) and the Operation and Support System (OSS).
The Switching System (SS) is responsible for carrying out call processing and subscriber related function.
All radio related function is performed by BSS, and it mainly consists of two things Base Station Controller (BSCs) and Base Transceiver Stations (BTSs).
Its Operation and Support System work is that they provide a network overview and support all maintenance operations.

What is CDMA ?

The full form of CDMA is Code Division Multiple Access. This is a digital cellular technology that uses the spread spectrum technique. Unlike other technology, GSM which uses TDMA, unlike CDMA, no one is assigned to a specific frequency user. Rather all channels use full available spectrum.

Security is given a lot of attention here. All individual conversations are encoded using a pseudo-random digital sequence. Compared to other digital cellular technology, it provides better data and voice communication, and more and more users can connect at a time. This is a common platform where 3G technologies have been created.

CDMA is a military technology that was first used by the British against Germans during the Second World War. It was used to jam the transmission so that they cannot send static signals. A company named Qualcomm designed the communication chip for CDMA technology. And when this information became public then Qualcomm filed its patent on it and became the first company to commercialize it.

Features of CDMA Technology?

If we talk about the features of CDMA technolgy, then there are many features of it which I have mentioned below so that you are easy to understand.

CDMA is a type of multiplexing that enables many signals to occupy a single transmission. This increases the efficiency of using bandwidth completely.
This is a type of technique also called spread spectrum technique that allows a lot of users to occupy a fixed space, band at the same time and frequency simultaneously.
Individual conversations are encoded with the help of a pseudo-random digital sequence.
This technology is used in the ultra-high-frequency (UHF) cellular telephone system, where the band range is from 800MHz to 1.9GHz.
This technology is quite different from other technology such as Time Division Multiple Access and Frequency Division Multiple Access. Here the user has full bandwidth, full time access. 

The basic principle of CDMA is that different CDMA codes are used to differentiate different users.
The technique used here is Direct Sequence Spread Spectrum Modulation (DS-CDMA), Frequency Hoping or Mixed CDMA detection (JDCDMA).
Here when the signal is generated, it is extended over the entire bandwidth. This is done by using a code, also called a Spreading Code.
By using a group of codes that are orthogonal to each other, it is possible that we can recognize a signal that has a constant code, within other orthogonal codes.

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