Just to simplify here are few basic differences which will give you a got idea. The main distinction between gsm and cdma is that in gsm, the customer information is put on a sim card. The sim card can be placed in any gsm supporting hardware and can have access to all the contacts. It is used in cellular communication similar to gsm and is a second generation and third generation standard for mobile networks. You can put a sim from one phone into a newer one and all your info like phone number and plan will go to the new phone. Cdma technology was developed and patented by qualcomm, a famous chip maker. Cdma code division multiple access it is a 3gpp2 tech. For cdma spreading code, we need a random sequence that passes certain quality criterion for randomness. 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. Following table mentions difference between cdma and gsm technologies.
Gsm supports transmitting data and voice both at once, but cdma have not this feature. Gsm vs cdma difference between gsm and cdma elprocus. Cdma is actually a newer technology than gsm and it offers some of the newest calling and data options evdo rev. Cdma as one of the major problems facing the development of telecommunications, bandwidth demand has driven the search for protocols that could be used to maximize bandwidth efficiency. What is the difference between tdma, cdma and gsm cell phones. Gsm and cdma are competing wireless technologies with gsm enjoying about an 82% market share globally. Gsm uses time division multiplexing along with other technologies, somewhat similar to the now abandoned us tdma standard. 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. It allows each user to transfer over the entire frequency spectrum all the time. It is a third generation network developed by ntt docomo and from 2g network cdma. Gsm uses a variation of time division multiple access tdma and is the most widely used of the three digital wireless telephony technologies tdma, gsm, and cdma. We want equal number of two 0s and 1s, a length of three 0s and 1s and four 0s and 1s etc.
What is the difference between tdma, cdma and gsm cell. Cdma or code division multiple access is often found in the u. You can get a lot of information regarding these two topic. Even canadas bell and telus started an hsdpa network, making them able to provide gsm phone selection. Whereas, gsm uses a combination of tdma and fdma methods. The gsm network is divided into three major systems.
The key difference between gsm and cdma is the multiple access method they use. Gsm global system for mobile communication and cdma code division multiple access are two dominant technologies for mobile. The development of code division multiple access cdma enabled thirdgeneration 3g mobile system is also. Cdma, code division multiple access, alternatively signifies a more powerful digital air interface standard, equating about eight to fifteen times the capacity of conventional analog cellular systems. What we now call cdma uses an entirely different technology, code division multiple access that gsm devices do not use in any way, shape or form. Difference between gsm and cdma with comparison chart. Compare every iphone model ever made with iphone 11. The switching system ss is responsible for performing call processing and subscriberrelated functions. You can compare gsm cell phone plans using wireflys comparison tool.
Global systems for mobile communications or gsm is the standard bearer of the 2g technologies. Pure gsm phones wont work on a cdma network, and vice versa. Gsm is in use by 76% of users as compared to cdma which is in use by 24% users. Gsm vs cdma difference between cdma and gsm youtube.
In the us, gsm operates in the bands 850 mhz and 1900 mhz. The basic difference between gsm and cdma is that gsm is specific to a sim card that is used with the mobile phone. Communication and cdma code division multiple access. 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. If it was much more better, there would be a world wide competition between gsm and cdma. Difference between cdma and cdma pdf semantic scholar. The basic difference between gsm and cdma is that the gsm is a sim specific i.
Gsm and cdma are different technologies that phones use to connect. This article discusses on the difference between gsm and cdma in terms of technology, security, global reach, sim card, flexibility, radiation emitted. Gsm is the branded term referring to a particular use of tdma timedivisionmultiple access technology. Difference between cdma and wcdma difference between. Technically gsm global system for mobile communications, originally from groupe special mobile is a specification of an entire wireless network infrastructure, while cdma relates only to the air interface the radio portion of the technology. Gsm global system for mobile communications is a standard set developed by the european telecommunications standards institute etsi to describe. In gsm traffic and signaling follow different multiframe structure. The worlds renowned mobile phone network technologies are gsm global system for mobile. So, in the us the fcc settled on a dualmode route that required either gsm or cdma. Gsm handsets came with a sim card slot, while cdma phones did not. The gsm association is an international organization founded in 1987, dedicated to providing, developing, and overseeing the worldwide wireless standard of gsm.
The cdma is based on spread spectrum technology which makes the optimal use of available bandwidth. 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 digitizes and compresses data, then sends it down a channel with two other. Gsm and cdma are the two ways phones talk to cell towers. Gsm is the dominant technology used around the globeand is. This can be taken as comparison between ofdm vs cdma. These two technologies differ in the way calls and data travel over the mobile phone networks. Switching gsm phones between different networks is easier than with cdma phones. Wcdma wide band code division multiple access umts before we talk about 4g or gsm.
Ofdm performs better compare to cdma and provides better tolerance with respect to multiple delay spread. Cdma stands for code division multiple access, which is a type of algorithm used in telecommunications to squeeze more usable channels within the same bandwidth. Flexibility gsm is more flexible than cdma as wide range of phones can be used with this service. Cdma, a proprietary standard designed by qualcomm in the united states, has been the dominant network standard for north america and parts of asia. Comparing cdma2000 and gsmgprsedgeumts figures 2 and 3 compare gsm, 1x, wcdma and 1xevdo voice over ip voip in terms of the amount of calls that each technology can handle in a 5mhz block of spectrum. These two technologies differ the way in which the calls. Thats because all gsm phones use removable sim cards. But engineers couldnt agree on which one was the best. Cdma has faster data rate as compared to gsm as evdo data transfer technology is used in cdma which offers a maximum download speed of 2 mbps. Pls tft display, exynos 7884 chipset, 3000 mah battery, 32 gb storage, 2 gb ram. Cdma and gsm are both multiple access technologies. Gsm stands for global system for mobile communication, while cdma stands for code division multiple access gsm uses fdma frequency division multiple access and tdma time division multiple access. Gsm and cdma are two dominant technologies in the world of mobile communication. These two technologies differ in the way calls and data travel over the mobile phone networks take place.
Theyre ways for people to cram multiple phone calls or internet connections into one radio channel. Multiple accesses multiplexing for short enable multiple signals to occupy a single communications channel. Following are some of the factors which describes difference between ofdm and cdma. Cdma is very useful as well as interesting from a buyers perspective. Global system for mobile communications gsm, around 8085% market share and is95 around 1015% market share were the two most prevalent 2g mobile communication technologies in 2007. Gsm is a very straightforward standard, whereas cdma is somewhat complicated. Difference between cdma and gsm gsm and cdma are two dominant technologies for mobile communication.
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. As gsm is an international standard, so its better to use gsm in international roaming. Cdma handsets offer analog capabilities which the gsm dont offer. It stands for code division multiple access and is used for the standards of 3g that include cdma2000 and wcdma. Cdma development group december 2005 delivering voice and data. 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. Whereas, cdma stands for code division multiple access. It allows mobile handsets to obtain much higher data speeds than what standard gsm can offer. Gsms highspeed wireless data technology, gprs general packet radio service, usually offers a slower data bandwidth for wireless data connection than cdmas highspeed technology, which. Tdma, or time division multiple access, sorts messages into time slots in order to send them. Wcdma is wideband cdma that still uses code division to divide the channels. On comparing both the technologies gsm has some limitation when the call quality is concerned but still has. Gsm and cdma spectrum frequencies the cdma network operates in the frequency spectrum of cdma 850 mhz and 1900 mhz while the gsm network operates in the frequency spectrum of gsm 850 mhz and 1900 mhz.
One of the main advantages of cdma is that dropouts occur only when the phone is at least twice as far from the base station. It allow the mobile handset to obtain much higher data speed than what standard gsm can offers. This carrier is divided into a number of time slots and each. It is the most widely used technology in the world for mobile phone communications. Keyword cellular communication, multimedia, cdma, 3gsm. As the ifft module does not exist, cdma is a single carrier technique unlike ofdm system. Thus, it is used in the rural areas where gsm cannot cover. On the other hand, in cdma the network identifies a handset by the information stored in the internal memory and hence, its handset specific. In other words, cdma is a handset based standard, with a phone number linked to a. The gsm operates on the wedge spectrum called a carrier. Another difference between gsm and cdma is in the data transfer methods. In 3g, the most prevalent technology was umts with cdma2000 in close contention all radio access technologies have to solve the same problems.
681 29 852 1424 293 1022 506 1211 1125 152 482 1040 962 722 386 576 649 458 6 1113 258 596 606 865 994 169 264 1440 386 1268 661 993 934 198 1473 1180 125 17 1266 1059 1348 592 1091 1292