GSM and CDMA comparison.

GSM (Global System for Mobile Communication) and,
 CDMA (Code Division Multiple Access).

(Brief information about CDMA)

CDMA (Code Division Multiple Access) World War 2 Foundation:CDMA emerged commercially in the mid 1990s. But it has its roots in the World War, the pre 2 Americans. In 1940 Heddy Lamarr, hollywood actress turns inventor and George Antheil was co invertor. In World War 2 both send a signal. The signals are sent over multiple radio frequencies using a random pattern. Inventor turns trial into execution in the form of technology. U.S. Navy dumped their work. The idea of ​​the so-called frequency hopping and later named as frequency hopping spread spectrum FHSS technology ie. They use it as secure communications. Later it became an important part of the government's security technologies. The U.S. Army in the mid-80s explained it is now used as the CDMA technology. This technique is completely based on spread spectrum technology. Soldiers immediately got the idea of ​​the wireless industry.
 CDMA (Code Division Multiple Access), which works as it digitized some conversation and then attach a code known only to the sender and penerima.Setelah attach code signals are then converted into bits and then re-assemble them. Military like CDMA only because the signal code. It produces secure transmission. The first company which patented CDMA Qualcomm and other telecommunications companies interested in the technology. This allows many simultaneous conversations. Transmission is engaged in analog and digital form. In 1991 CDMA tested commercially. First launched in Hong Kong in 1995 commercially. It is currently used by major cellular carriers in the United States and the brains of the Personal Communication System SPCS is Sprint. Other major users of CDMA isversion and GTE.The advantages of CDMA are as follows:Simultaneous conversations.From a security standpoint is safe and sound.Improved efficiency.

Small mobile

Low power requirements and are not required by the operator, cell-to-cell co ordination.Within the reach of all people especially the rural areas.Disadvantages of CDMA are as follows: -CDMA is new so the network is not good. Still making their networks.CDMA does not offer international roaming.Just because monopoly flaws unknown to the technique.(Brief information about GSM)

GSM (Global System for Mobile Communication):Qualcomm is a major competitive. Now handled by GSM (Global System for Mobile Communication). In Europe, especially in Western Europe people use GSM. The time evolution of the poorly kept single global wireless standard. In 1995, CDMA was introduced in Hong Kong. Then europeon wireless carriers and manufacturers selected to support the technology first available Time Division Multiple Access (TDMA). TDMA is used by GSM as a core technology keras.thats why most users of GSM in Europe and Asia. GSM Technology is the engineering world wide. Manufacturer of mobile companies are divided into many categories such as motorola, luminous & CDMA and Nextel select nokia and sony ericsson company is the dominant player and real than GSM. GSM is a cellular technology.Advantages of GSM is as follows:

GSM is used worldwide by more than 450 million existing customers.International roaming allows users to use the same phone in all of Western Europe. CDMA will work in Asia not only in France, Germany, Britain and other European places.GSM started in the mid-80s. So the network is more robust to many other features.Engineers put all their efforts in improving the GSM and create preference.It has a subscriber identity module. This is a smart card and provide secure data with GSM M commerce.Disadvantages of GSM is as follows: -Lack of access to start developing the American market.

SOURCE;http://www.yangcanggih.com/2011/04/26/blackberry-curve-8530-blackberry-gemini-untuk-jaringan-cdma/

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