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(Code Division Multiple Access) 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 call quality.
Wiki User
∙ 15y ago
Wiki User
∙ 14y agoCode 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.
Wiki User
∙ 13y agoCode 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-spectrum signaling, since the modulated coded signal has a much higher data bandwidth than the data being communicated.
Wiki User
∙ 15y agoCode Division Multiple Access A North American digital cellular telephone technology
Wiki User
∙ 11y agocode division multiple access
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Does Vodafone have CDMA or GSM facility?
The Vodafone group operates in 16 different countries in Europe. Vodafone-Germany operates both GSM and UMTS (W-CDMA) networks
How do i switch phones with a CDMA phone?
This cannot be done unless you change the hardware itself. CDMA and GSM are two different technologies used by the carriers and it's a difference in the hardware that makes it not possible for you to convert a CDMA phone on GSM, or vice versa. i just bought a htc evo 4g and its a cdma phone.I am taking it along with me to Europe and i know it may not be used there,but a friend of mine told me it could be converted to gsm only if a space behind the phone can be created and also other features would be formated before i start using it.so i think cdma could be converted to gsm
What network uses radio waves instead of wires or cables?
WiFi, WiMax, and the two cell phone networks: GSM and CDMA
Is the LG Voyager Mobile available in the UK?
The LG Voyager mobile phone is not available in the UK. LG Voyager mobile is a CDMA phone, which does not work outside the US.
Mean by first impression last?
whats mean of first impression whats mean of first impression
Which is best CDMA or gsm?
CDMA, offers better data transfer
Are HTC phones CDMA?
Not all HTC phones are powered by CDMA.Some of CDMA phones are :HTC S720 (CDMA)HTC P4000 (CDMA)
Is ATT CDMA?
no its HSDPA sprint or Verizon or both are cdma
What if operating frequency for CDMA network in yemen?
cdma gsm
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/wiki/CDMA
Can you convert cdma sim to cdma?
Code division multiple access
Is CDMA better or gsm to be used in egypt?
does cdma work in egypt
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.
What is CDMA mobile and gsm mobile?
voice quality is better cdma techology
Will a CDMA sim card work in a next g mobile phone?
There is no such thing as a CDMA SIM card, since CDMA phones do not use SIM cards.
Difference between CDMA 800 and CDMA 1900?
- CDMA800 (low band) is at freq 800MHz whereas CDMA1900 (high band) is at 1900MHz. - TX power of CDMA800 is lower than the CDMA1900.
Why do CDMA phones get heated up while talking?
Calculations!!! CDMA Does lot more calculations than CDMA and Chip gets heated. its GSM rather
