What is CDMA mobile?

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Code division multiple access (CDMA) is the current name for the cellular technology originally known as IS-95. This technology is in competition with the GSM technology set for leadership in the global cellular technology market. Developed originally by Qualcomm and enhanced by Ericsson, CDMA is characterized by its high capacity and small cell radius, employing spread-spectrum technology and a special coding scheme (using which each transmitter is assigned a code). By contrast, time division multiple access divides access by time, while frequency-division multiple access divides it by frequency. CDMA is a form of "spread-spectrum" signaling, since the modulated coded signal has a much higher bandwidth than the data being communicated.
An analogy to the problem of multiple access is a room (channel) in which people wish to communicate with each other. To avoid confusion, people could take turns speaking (time division), speak at different pitches (frequency division), or speak in different directions (spatial division). In CDMA, they would speak different languages. People speaking the same language can understand each other, but not other people. Similarly, in radio CDMA, each group of users is given a shared code. Many codes occupy the same channel, but only users associated with a particular code can understand each other.
CDMA also refers to digital cellular telephony systems that use this multiple access scheme, such as those pioneered by QUALCOMM, and W-CDMA by the International Telecommunication Union (ITU).
CDMA has been used in many communications and navigation systems, including the Global Positioning System and in the OmniTRACS satellite system for transportation logistics.
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What is cdma?

( C ode D ivision M ultiple A ccess) A method for transmitting simultaneous signals over a shared portion of the spectrum. The foremost application of CDMA is the digital cellular phone technology from QUALCOMM that operates in the 800MHz band and 1.9GHz PCS band. CDMA phones are noted for their ( Full Answer )

Applications of cdma?

Code Division Multiple Access can allow for multiple levels ofconversation at the same time on different lines of communication.It does this by first using conventional modulation practices, thenby applying a special digital modulation technique known as SpreadSpectrum.Ê It allows for spectral ef ( Full Answer )

Which one is better GSM or CDMA mobile?

This depends on where you are, but 9 times out of 10 CDMA will provide better coverage than GSM, especially inside buildings that GSM can't penetrate. GSM= work with SIMcards ( ATT,T-mobile) some areas have better coverage than CDMA (Verizon, Sprint, Alltel ect), the Problem with GSM is that its b ( Full Answer )

Advantages of CDMA?

CDMA is Code-Division Multiple Access abbreviation, full known as Code Division Multiple Access, is a more advanced digital interface technology, which is characterized by a high frequency of utilization, mobile low power consumption, good quality voice calls. 2. Compared with GSM phones, CDMA mobil ( Full Answer )

How do i switch phones with a CDMA phone?

You must either take the phone into the cellular providers store or call them and they will direct you thorugh the process. It merely consists of punching in numbers.

Is Motorola q CDMA?

i have the Motorola q cdma, that's what the version i have is called... so no not all are called that there is also the q9m and q9c i think i might have the 9qc im not sure...

What is near far effect in CDMA?

in cdma The near-far problem is a condition in which a receiver captures a strong signal and thereby makes it impossible for the receiver to detect a weaker signal

What is the CDMA technology?

Code Division Multiple Access ( CDMA ) is a channel access method used by various radio communication technologies. By contrast, time division multiple access ( TDMA ) divides access by time, while frequency-division multiple access ( FDMA ) divides it by frequency. CDMA is a form of spread-spe ( Full Answer )

Full form of CDMA and GSM?

Full form of CDMA is code divison multiple access and full form of GSM is Global system for mobile communications.

What use is CDMA in mobile?

CDMA is a type of network that cell phone company's use. There are to meager types of networks that are used CDMA and GSM. Cell phone are usally made to work on one or the other network. The Iphone is GSM and Verizons Dare is CDMA but some phone can work on both like the new Blackberry storm.

What is the difference of GSM and CDMA?

GSM phones have sim cards that contain your information and can be transferred between phones, and cdma phones store the information in the phone itself. The two networks are not compatible with each other so phones cant be switched between the two

Compare CDMA and GSM?

CDMA is used by Verizon and Sprint. That technology only works in the USA. It doesn't use sim cards, so upgrading can be a little more difficult. GSM is used by AT&T and T-Mobile. The technology works world-wide. They use sim cards making it easier for upgrading your phone. On BIG upside of GSM i ( Full Answer )

What is CDMA repeater?

A CDMA repeater is a device that extends the signal range for cell phone providers that use the CDMA technology. CDMA (Code Division Multiple Access) is one of the technologies cell phone companies use for their phone service. More information on CDMA is available here:. http://en.wikipedia.org/wik ( Full Answer )

Difference between CDMA and tdma?

1. Their abbreviation meanings actually give light to the manner they optimize channels. TDMA is short for Time-Division Multiple Access while CDMA is for Code-Division Multiple Access. 2. TDMA emerged and was utilized first. CDMA is the more recent technology gradually replacing TDMA. 3. TDMA ( Full Answer )

Will CDMA sim will work in WCDMA mobile?

There is no such thing as a CDMA SIM card.CDMA is a technology which doesnt use SIM cards.And WCDMA is evolved from gsm and uses SIM cards for 3g.

What is the main limitation in CDMA technology?

\nSignal Coverage - drive through a long tunnel or ride a lift and your phone's dead.\n. \nOther ones could be -\n. \nNo Data Packet Access in simple CDMA (e.g. you can browse the net' on your phone)\n. \nLess Users - More Cells needed to service people. Remember the old problem of sending an SMS ( Full Answer )

What are the disadvantages in cdma?

Disadvantages to CDMA are Your handset can only be used with the provider that you got the phone from. Should your phone brake under contract but out of warranty, getting a new phone from the provider will automatically extend your contract another 2 years. CDMA is limited to North America and a f ( Full Answer )

What are the disadvantages of cdma?

CDMA can only be used in North America. If one breaks a phone while not under contract but not under warranty, getting a replacement from the provider will automatically extend the contract by two years.

Is boost mobile CDMA or gsm?

Boost mobile has two types of service, CDMA and IDEN. So technically its CDMA and TDMA, they do not have GSM service.

Why CDMA is better than fdma?

In CDMA all the stations can sends data simultaneously. But in FDMA only one channel occupies the entire bandwidth of the link so each channel can be assigned to only one user at a time. So CDMA is better than FDMA.

What is the bandwidth of CDMA mobile?

800 mhz & 1.8 ghz - This was the first answer given. Hertz is a measurement of the speed of a transmission with respect to electrical wave produced. A technique is then used by the sending and receiving device to transmit data on the waves produced. This can be from 1 to many bits per wave. If a tr ( Full Answer )

Can tata indicom sim be used in CDMA mobile?

yes...absolutely CDMA phones only allow certain sim....and tata indicom is one of them people usually take CDMA phone for tata indicom and its converse is also true

What brands of mobile phones support both gsm and CDMA?

Some popular brands like RIM Blackberry, Samsung, Sony Ericsson, Motorola, LG have phone models that are offered on GSM carriers and they also have phones offered on CDMA carriers, however, if you want to know what phone models have both GSM and CDMA technology, then some examples are the Blackberry ( Full Answer )

Who invented CDMA technology?

\n • In 1989, the Telecommunications Industry Association (TIA) endorsed a digital technology called Time Division Multiple Access (TDMA ). Just three months later, Qualcomm introduced Code Division Multiple Access (CDMA) , a superior technology for wireless and data products that ( Full Answer )

What are the CDMA bands?

CDMA-(code division multiple access), uses spread spectrum technique, which spreads the bandwidth of the data uniformly for the same transmitted power. (surce:wikipedia)

What is the uplink and downlink frequency in CDMA?

In the CDMA technology It is either between your Handset and the Mobile Station. The dedicated frequency are allocated for u sending your data to the mobile station (Uplink freuency) and a dedicated frequency is reserved for you to receive your data from the mobile station (Downlink frequency)

Why cdma accept only cdma card?

There is no such thing as a CDMA card so there is no card for a CDMA device to accept. With a CDMA device you have to contact the service provider and give them the new device's ESN and once they have that changed in their system they will walk you through manually programming your new device.

How do youfind out if my phone is CDMA or gsm?

If there is a place for a SIM card under the battery then the device is GSM. If there is not a place for a SIM card then it is CDMA. Also, if there is an ESN on the bar code label under the battery then it is also CDMA. If there is an IMEI on the bar code label then it is GSM.

What is Actual working of CDMA technology?

Brief Working of CDMA CDMA takes an entirely different approach from TDMA. CDMA, afterdigitizing data, spreads it out over the entire available bandwidth. Multiplecalls are overlaid on each other on the channel, with each assigned a unique sequencecode. CDMA is a form of spread spectrum, which simpl ( Full Answer )

Will iPhone CDMA can be use to sprint?

As of right now ONLY AT&T carries the iPhone, they are on Edge coverage. BUT as you have probably heard, Verizon will be releasing the iPhone4 this February 2011. They are on a cdma network, as well as Sprint. It IS a possibility that Sprint could want in on the iPhone obsession, but lately Sprint h ( Full Answer )

What is the difference between CDMA and FDMA?

Both these techniques allow multiple transmitters to transmit simultaneously over a single communication channel. In FDMA, available bandwidth is divided into different frequency ranges and each transmitter is assigned a specific frequency range. In CDMA, a special signal called carrier is used to e ( Full Answer )

What is the use of pilot channel in CDMA?

The pilot channel corresponds to the all zeros Walsh code (Walsh channel 0), and contains the unmodulated quadrature PN spreading code. It is transmitted at higher power than the user channels, and is provided so that each subscriber within the cell can determine and react to the channel chara ( Full Answer )

Why do you use gsm compared to CDMA?

It's a matter of convenience and practicality throughout the world more than anything else. GSM uses a SIM, Subscriber Identity Module, that connects the phone to a GSM network. This SIM is removable and replaceable. This allows the cellphone user to unlock a phone for a specific carrier or country ( Full Answer )

Which companies use CDMA technology?

Qualcomm, Boost Mobile, MetroPCS, Leap Wireless International Inc., Net 10, Sprint, Verizon, Cricket, and Alltel use CDMA technology.

How are CDMA mobile phones different from other phones?

The difference between CDMA mobile phones compared to other phones are that CDMA mobile phones do not require a SIM card. As well as this the carrier's information is stored in the phone's software.

Where can you find information on CDMA mobile phones?

You can find information on CDMA mobile phones online at the Wikipedia. Once on the website, type "CDMA" into the search field at the top of the page and press enter to bring up the information.

What does a CDMA cell phone do?

A CDMA cell phone does many things. A CDMA cell phone, which stands for Code Division Multiple Access, can make an unlimited number of calls because there is no limit.

Where can CDMA Mobile Phones be purchased?

CDMA Moblie Phones can be purchased at Home Shop 18. They may also be purchased at Boost Mobile, Shop Clues and Maniac Store as well as Newegg and Radio Shack.