CDMA2000 1x EVDO
CDMA standard was developed as a military technology. Because Qualcomm created communications chips for CDMA technology, it was privy to the classified information. Once the information became public, Qualcomm claimed patents on the technology and became the first to commercialize it. Due to the newness of CDMA and extended standards such as CDMA-2000 and W-CDMA, the CDMA standard is rapidly growing in popularity in the US, South America and certain parts of Asia.CDMA is an acronym which stands for Code Division Multiple Access. Of the three digital standards mentioned above, CDMA is the newest and allows for the highest capacity and highest mobile data throughput. Modern CDMA phones support the creation of text and picture messages and thus these messages can be processed and displayed by.
Cellular telephone systems in the 800-MHz
The original CDMA standard, also known as CDMA One and still common in cellular telephones in the U.S., offers a transmission speed of only up to 2 Mbps in its single channel form and up to 115 Kbps in an eight-channel form. CDMA2000 and wideband CDMA deliver data many times faster.
The world is demanding more from wireless communication technologies than ever before as more people around the world are subscribing to wireless. Add in exciting Third-Generation (3G) wireless data services and applications - such as wireless email, web, digital picture taking/sending, assisted-GPS position location applications, video and audio streaming and TV broadcasting - and wireless networks are doing much more than just a few years ago.
This is where CDMA technology fits in. CDMA consistently provides better capacity for voice and data communications than other commercial mobile technologies, allowing more subscribers to connect at any given time, and it is the common platform on which 3G technologies are built.
Third Generation (3G) is the term used to describe the latest generation of mobile services which provide advanced voice communications and high-speed data connectivity, including access to the Internet, mobile data applications and multimedia content.
The International Telecommunication Union (ITU), working with industry standards bodies from around the world, has defined the technical requirements and standards as well as the use of spectrum for 3G systems under the IMT-2000 (International Mobile Telecommunications-2000) program.
The ITU requires that IMT-2000 (3G) networks, among other capabilities, deliver improved system capacity and spectrum efficiency over 2G systems and that they support data services at minimum transmission rates of 144 kbps in mobile (outdoor) and 2 Mbps in fixed (indoor) environments.
Based on these requirements, in 1999 the ITU approved five radio interface modes for IMT-2000 standards (Recommendation 1457). Three of the five approved standards (CDMA2000® , TD-SCDMA, WCDMA) are based on CDMA. CDMA2000 is also known by its ITU name, IMT-2000 CDMA Multi-Carrier (MC).
The world's first 3G commercial system was launched by SK Telecom (South Korea) in October 2000 using CDMA2000 1X. By the end of 2006 there will be more than 430 million 3G users across all six continents, In Korea, Japan and North America there are already more 3G users than 2G subscribers, and globally the number of 3G subscribers is expected to surpass 2G in 2011, ten years since 3G’s inception and 5 years less than it took 2G to surpass 1G.
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