Cdma is shorthand for code division multiple access, which is one of the major radio systems that are used in cell phones. Gsm global system for mobile and wcdma wideband code division multiple access are two types of wireless technologies or radio system technologies. Both the technologies can be used with 3g standard phones, but 3g gsm speeds can be faster than 3g cdma speeds. When they both are used together, they will be termed as 3g cdma. Gsm and cdma are different technologies that phones use to connect. As the term implies, cdma is a form of multiplexing, which allows numerous signals to occupy a single transmission channel, optimizing the use of available bandwidth. This is more so when we buy mobile phones that have the standard contract from the phone company, since it is 100% assured that it would function with that network. Gsm and cdma in hindi difference between gsm vs cdma. Difference between gsm and cdma with comparison chart.
Difference between cdma and cdma pdf semantic scholar. It was the first of the two technologies, and mandated in european law in 1987. It simply reads the sim chip, the rest is dependent on the devices cellular radios, baseband, baseban. There are two types of cell phone technology, cdma and gsm. Gold sequences are in useful in nonorthogonal cdma. Other limitations of the cdma model include the inability to receive voice and data simultaneously and slower data altogether, the inability to place a call on hold and. Moreover, cdma is the infrastructure on which all 3g networks are. Gsm is widely used technology whereas cdma is less used technology. The cdma is based on spread spectrum technology which makes the optimal use of available bandwidth.
The main difference between cdma and gsm is where your information is stored. Cdma is an example of multiple access, which is where several transmitters can send information simultaneously over a single communication channel multiple access in cdma. Cdma mobile communication standard uses, well the obvious cdma method. In cellular service there are two main competing network technologies. Umts stands for universal mobile telecommunications system, and it succeeds the older gsm networks. As gsm is an international standard, so its better plan to use gsm in international roaming. Gsm stands for global system for mobile whereas cdma stands for code division multiple access. Cdma or code division multiple access is often found in the u. There are two main types of mobile phones that are in use all over the world.
Following table mentions difference between cdma and gsm technologies. Difference between cdma and wcdma difference between. Gsm uses a combination of both tdma and fdma techniques. Pn codes in the form of walsh codes are assigned for communication. Cdma mobile networks, gsm stands for global system for mobile communication, and cdma stands for code division multiple access. These two technologies differ in the way calls and data travel over the mobile phone networks. The coverage area of cdma is more limited than gsm. The sharing of bandwidth in gsm leads to communication lag and interference when a high number of users are active. Whereas, gsm uses a combination of tdma and fdma methods.
Gsm global system for mobile communication and cdma code division multiple access. The most major difference between cdma and wcdma is in the group of technology that it is grouped with. Gsm network is consists of mobile station, base station subsystembts. These are two completely separate networks of cell towers. The worlds renowned mobile phone network technologies are gsm global system for mobile. Gsm stands for global system for mobile evolution, developed based on 3gpp standards. One runs on a gsm network sort of while the other runs on a cdma. A, 800 mhz, 1900 mhz, which means that global coverage is considerably more limited. Wcdma is a 3g technology that is often used in tandem with. They were both developed in the early nineties for 2g connectivity. Gsms highspeed wireless data technology, gprs general packet radio service, usually offers a slower data bandwidth for wireless data connection than cdmas highspeed technology 1xrtt, short for single carrier radio transmission technology, which has the capability of.
Cdma is very useful as well as interesting from a buyers perspective. The key difference between the two is that gsm is a standard and cdma is a technology, but gsm, over the years has come close to attaining technological status. Gsm, you need to be aware that the gsm technology enables transmission of voice and data in the same time while the cdma technology cannot do that. What is the difference between cdma and gsm mobile. The gsm association is an international organization of cellular carriers founded in 1987, provide coverage worldwide using the european etsi wireless standard gsm. Sep 27, 2016 the basic difference between gsm and cdma is that the gsm is a sim specific i. Gsm allocates comparatively less subscriber than cdma.
Communication and cdma code division multiple access. Cdma, code division multiple access an implementation of direct sequence spread spectrum, dsss, and was used almost universally for 3g mobile communications standards as it provided an excellent format as a multiple access scheme. Different users of each rf channel are allocated different time slots there are 8. Wcdma is wideband cdma that still uses code division to divide the channels. On the other hand, in cdma the network describes a handset from the data stored in the internal memory and consequently, its handset special. With cdma devices, your information is stored on the device. Gsm is the most widespread in comparison to cdma, thus it provides extensive coverage. Im trying to decide between two prepaid cell providers for my next phone. All radio access technologies have to handle the same problems. The iphone 4 cdma model, on the other hand, instead supports cdma evdo, rev.
On the other hand, in cdma the network identifies a handset by the information stored in the internal memory and hence, its handset specific. The cellular mobile service is being used everywhere in the world today. Difference between cdma and gsm cell phones synonym. The history gsm during the early 1980s, analog cellular telephone systems were experiencing rapid growth in europe, particularly in scandinavia and the united kingdom, but also in france and germany. The main difference between gsm and wcdma is that gsm is a 2g technology while wcdma is a 3g technology. The first is gsm global system mobile and cdma code division multiple access. In second and third generation wireless communication a. The idea of gsm was first developed at bell laboratories in 1970, and was. They also have a single autocorrelation peak at zero, just like ordinary pn sequences. The differences between gsm and cdma 12 years its come to my attention that not everyone understands the subtle yet significant differences between gsm and cdma. We partner with two of americas largest nationwide 4g lte cellular networks one using gsm technology and the other cdma technology to give you the best coverage in your area. Jun 02, 2017 the key difference between gsm and cdma is the multiple access method they use. It is the enabling technology used by sprint, verizon and us cellular. S and russia, though gsm is also present in those countries.
The fundamental difference between gsm and cdma is the gsm is a sim specific i. These two technologies differ in the way calls and data travel over the mobile phone networks take place. The crucial difference between gsm and cdma is that gsm uses sim subscriber identification module card as the major component of the mobile station. Can i use my old cdma sim in the wcdma slot of my new smartphone. The sim card can be placed on any gsm supporting hardware and can have access to the service. Cdma2000 success story in japan as of nov, 2003 total 3g sub. On the other hand, cdma is considered as the most secure telephonic network. This means, your phone number, contact list, and other important details are attached to your android or ios phone. This carrier is divided into a number of time slots and each. Tdmafdma, cell frequency planning is more tedium task as frequency and time planning need to be carried out in cdma frequency planning is minimal.
Gsm global system for mobile communication and cdma code division multiple access are two dominant technologies for mobile communication. This is done in gsm via gaussian minimum shift keying gmsk. You should know that each successor to the mobile network technology has one numeric number followed by the alphabet g. Apr 15, 2020 understanding the difference between gsm and cdma will allow you to choose a carrier that uses the preferable network technology for your needs. May 01, 2019 cdma networks allow for a greater number of users, meaning their capacity for communication is greater than that of gsm networks. Gsm is more reliable whereas cdma is less reliable. Jul 28, 2014 cdma, along with gsm and tdma, refers to any of several protocols used in secondgeneration 2g and thirdgeneration 3g wireless communications. Nov 15, 2019 understanding the difference between cdma and gsm two hugely important standards for radio telecommunications is crucial before buying a new smartphone or switching carriers. They are 2 radio networks used by wireless carriers. May 22, 20 gsm digitizes and compresses data, then sends it down a channel with two other streams of user data, each in its own time slot cdma code division multiple access cdma, unlike tdma and gsm, after digitizing data, spreads it out over the entire bandwidth available to it unlike gsm and tdma which place the calls side by side in three streams. To continue with cdma we next discuss spread spectrum techniques.
As the european union permissions gsm use, so cdma is not supported in europe. But in case you did not know, there are 2 very prominent technologies around the world. Cdma is almost exclusively used in the united states and some parts of canada and japan. Another difference between gsm and cdma is in the data transfer methods. I think this is a matter of opinion really, for me gsm gives me the ability to use an unlocked device and use it pretty much anywhere in the world which is not the same case for a cdma device, also as mentioned by tbaker, phone selection is so much greater. Difference between cdma and gsm gsm and cdma are two dominant technologies for mobile communication. However, gsm has also gotten certain status as a technology. Gsm supports transmitting data and voice both at once, but cdma have not this feature. Cdma and gsm are two different types of standards that are available for transmitting data and mobile voice services on a cell phone or mobile phone. What is the difference between cdma and gsm phones answers. Gsm vs cdma difference between gsm and cdma elprocus. It allows each user to transfer over the entire frequency spectrum all the time.
Most of the people are familiar with gsm but only few knows about wcdma. Determining whether an ipad supports gsm or cdma is an important step when purchasing one of the tablets or selecting a carrier. Some mobile carriers support only gsm network standards, while others use cdma standards. Gsm and cdma are two dominant technologies in the world of mobile communication. Ive done a little research to understand the difference between gsm and cdma networks that carriers work on but am still a little confused. Tdma, or time division multiple access, sorts messages into time slots in order to send them.
Gsm is considered the worldwide standard for cellular telephone communication. The main difference between umts and wcdma is that the former is a cellular technology while the latter is one of the air interfaces that it used in order to communicate with the actual device. So, 2g means 2nd generation, 3g means 3rd generation, 4g means 4th generation and so on. Before the advent of 4g lte, the obvious difference between gsm and cdma devices were with regards to the sim card. Gsm is a very straightforward standard, whereas cdma is somewhat complicated. The gsm operates on the wedge spectrum called a carrier. This article is all about the difference between gsm and cdma technology. Gsm global system for mobile communications is a standard set developed by the european telecommunications standards institute etsi to describe. The difference between cdma and gsm unlocked unreal. Gsm and cdma are the most successful cell phone technologies present in world, cdma handsets are chip based where as gsm handsets uses sim cards, using. Gsm is the standard for mobile communication, particularly in asia and europe, and functions on four frequency bands.
However, the one chief difference between the two standards involves the way the data is transformed through the radio waves a smartphone receives and broadcasts. What is the difference between tdma, cdma and gsm cell phones. Both gsm and cdma standards get multiple access, meaning that a large number of calls can go through a single cell phone tower. What is the difference between cdma and gsm answers. Understanding the difference between gsm and cdma will allow you to choose a carrier that uses the preferable network technology for your needs. Difference between gsm and cdma the worlds renowned mobile phone network technologies are gsm global system for mobile communication and cdma code division multiple access. Cdma code division multiple access and gsm global system for mobiles are shorthand for two older radio systems 2g and 3g used in cell phones. Gsm vs cdma difference between cdma and gsm youtube. Cdma 2000 is mostly an orthogonal cdma system gold sequences have only three crosscorrelation peaks, which tend to get less important as the length of the code increases. It propagates further, works better inside structures, has built in noise cancellation, more calls per cel cite, automatically hands off calls to different cel cites to minimize congestion, and works better in low signal areas to name a few. In gsm, the entire frequency band is not available to the enduser, while in cdma the entire frequency band is available to the. Comparison of cdma and gsm mobile technology article pdf available.
Lte long term evolution is a wireless broadband technology for communication of high speed data for mobile phones. Gsm global system for mobile communication gsm global system for mobile communication is a standard developed by the european telecommunications standards institute to describe the protocols for secondgeneration digital cellular networks used by mobile devices such as mobile phones and tablets. The development of code division multiple access cdma enabled thirdgeneration 3g mobile system is also highlighted. So, in the us the fcc settled on a dualmode route that required either gsm or cdma. Jul 06, 2019 cdma, or code division multiple access, was a standard designed and patented by qualcomm, but subsequently used as the basis for the cdma2000 and wcdma standards for 3g. The newer ipad air, ipad mini and some fourth generation. But engineers couldnt agree on which one was the best.
In case of cdma, each device like a mobile phone or a wireless modem is given a unique code that is registered with the carrier. Global coverage gsm networks are available in more than 200 countries worldwide, which makes the gsm a more popular technology as compared to cdma. The type of phone you choose largely depends on what carrier you want to go with, since each offers either. These two technologies differ the way in which the calls and data transfer takes place over a network and mobile. Gsm handsets came with a sim card slot, while cdma. The major difference between these two is that cdma is actually a technology, while gsm is actually a standard. Jul 09, 2017 the vast majority of countries use gsm. Also the sim slot itself doesnt determine the type of network your phone or device is compatible with. However, the main focus is to differentiate between 3g and cdma. The basic difference between gsm and cdma is that the gsm is a sim specific i.
Apr 17, 2016 um, there is no such thing as a cdma sim. Difference between gsm and cdma in hindi mobile phone. Gsm vs cdma whats the difference between the two technologies. As against cdma despite using a sim card, operates on esns electronic serial numbers which is a mobile stationspecific identity. Gsm and cdma are the most successful cell phone technologies present in world, cdma handsets are chip based where as gsm handsets uses sim cards, using the gprs and edge facility gsm is successful. What are phone bands gsm, cdma and why do they matter. How to tell if an ipad is gsm or cdma your business. Thus, cdma is different from narrowband system design in the sense that all users. Cdma is a 2g technology and is a direct competitor to gsm, which is the most widely deployed technology. Dec 10, 2016 code division multiple access cdma is a channel access method used by various radio communication technologies. If multiple users transmit a spreadspectrum signal at the same time, the receiver will still be able to distinguish between users, provided that each user has a unique code that has a sufficiently low crosscorrelation with the other codes. Difference between umts and wcdma network technologies.
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