Cdma

0 Comments Leave a Comment

1-7 of 7
Categories:
Technologies: MMS, Mobile Applications, Mobile Marketing, Mobile Security, Mobile Social Networking, Mobile Spam, Operator Services, Smartphones, SMS
Regions: Americas, APAC, EMEA
Standards & Legislation: Congress & FCC, Distracted Driving, Handset Exclusivity

About Cdma

Code division multiple access (CDMA) is a channel access method utilized by various radio communication technologies. It should not be confused with cdmaOne (often referred to as simply "CDMA"), which is a mobile phone standard that uses CDMA as its underlying channel access method.

Read More


CDMA employs spread-spectrum technology and a special coding scheme (where each transmitter is assigned a code) to allow multiple users to be multiplexed over the same physical channel. 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 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 has been used in many communications and navigation systems, including the Global Positioning System and the OmniTRACS satellite system for transportation logistics.

  1. Mentioned In 7 Articles

  2. Bits and Bytes: WiMAX Forum news; CDG awards; and more - RCR Wireless News

    Explore Article Mobile Technology (Jun 18 2010) Mobile Spam , SMS , Americas , EMEA

    Bits and Bytes: WiMAX Forum news; CDG awards; and more - RCR Wireless News ... which allows vendors to begin creating compatible equipment for certification early next year. The CDMA Development Group announced the winners of its 2010 3G CDMA Industry Achievement Awards, which recognizes individuals and companies for excellence in deploying... (Read Full Article)

    Comment on Article Mentions:   Airwide Solutions   iPhone   ZTE

  3. Analyst Angle (Special Edition): Apple iPhone 4 & AT&T metered data - RCR Wireless News

    Explore Article Mobile Technology (Jun 10 2010)

    Analyst Angle (Special Edition): Apple iPhone 4 & AT&T metered data - RCR Wireless News ...re are a number of things that are not included in the iPhone 4: a version of the iPhone running on CDMA that would allow Verizon Wireless and Sprint to offer the iPhone. It looks like AT&T’s exclusive is... (Read Full Article)

    Comment on Article Mentions:   Technology   iPhone   AT&T

  4. The Saturation Myth: Why US will grow far past 100% cellphone penetration

    Explore Article Communities Dominate Brands (May 11 2010) SMS , Americas

    ...rs. GSM standard with its open SIM card system is more conducive to multiple subscriptions than the CDMA system which normally does not include a SIM card (but in some markets like South Korea for example... (Read Full Article)

    Comment on Article Mentions:   Technology   iPhone   Ctia

  5. Google reinvents mobile pricing, purchasing

    Explore Article TELEPHONY Online (Jan 5 2010)

    ...cused on making future phones"world phones," but did not confirm if the Nexus One will support both CDMA and GSM when it comes to VZW in the spring. The Nexus One has had many in the industry excited sinc... (Read Full Article)

    Comment on Article Mentions:   iPhone   AT&T   T-Mobile

  6. Apple Predictions for 2010: iPhone on Multiple Carriers, iSlate, Beatles

    Explore Article eweek.com (Jan 2 2010) Mobile Applications , Americas

    ...ders. The AT&T contract is due to expire in 2010, leading to speculation that Verizon could offer a CDMA version of the iPhone at some point after that. Previously, some analysts have suggested that Apple... (Read Full Article)

    Comment on Article Mentions:   iPhone   AT&T   Android

  7. Once again, rumours surface about T-Mobile and Sprint merger

    Explore Article gomonews.com (Dec 11 2009) Americas

    ...nd if you bring the technology side of things into it, it gets even messier. Sprint networks run on CDMA infrastructure, while T-Mobile runs on the GSM technology that is more common in the European count... (Read Full Article)

    Comment on Article Mentions:   Technology   AT&T   T-Mobile

  8. If Google Does Build A Phone, What Network Will It Run On?

    Explore Article mocoNews (Nov 18 2009)

    If Google Does Build A Phone, What Network Will It Run On? ... to Clearwire’s network. When the user leaves the Clearwire territory, it could roam on to Sprint’s CDMA network, which is Clearwire’s majority owner. The reason why this could work is because unlike othe... (Read Full Article)

    Comment on Article Mentions:   iPhone   AT&T   Android

1-7 of 7