Saturday, November 8, 2008

CDMA TECHNOLOGY

HERE DISCUSSING ABOUT CDMA TECHNOLOGY GOING AHEAD CDMA is characterized by high capacity and small cell radius, employing spread-spectrum technology and a special coding scheme. Capabilities of cdmaOne evolution have already been defined in standards. IS-95B provides ISDN rates up to 64 kbps. The next phase of cdmaOne is a standard knows as 1XRTT and enables 144 kbps packet data in a mobile environment. Other features available are a two-fold increase in both standby time and voice capacity. All of these capabilities will be available in an existing cdmaOne 1.25 MHz channel. The next phase of cdmaOne evolution will incorporate the capabilities of 1XRTT, support all channel sizes (5 MHz, 10 MHz, etc.), provide circuit and packet data rates up to 2 Mbps, incorporate advanced multimedia capabilities, and include a framework for advanced 3G voice services and vocoders, including voice over packet and circuit data. NOW there are numbers of CDMA brands: Composite CDMA/TDMA Wireless technology that uses both CDMA and TDMA. For large-cell licensed band and small-cell unlicensed band applications. Uses CDMA between cells and TDMA within cells. Based on Omnipoint technology. CDMA In addition to the original Qualcomm-invented N-CDMA (originally just 'CDMA', also known in the US as IS-95. See N-CDMA below). Latest variations are B-CDMA, W-CDMA and composite CDMA/TDMA. Developed originally by Qualcomm, CDMA is characterized by high capacity and small cell radius, employing spread-spectrum technology and a special coding scheme. It was adopted by the Telecommunications Industry Association (TIA) in 1993. The first CDMA-based networks are now operational. B-CDMA is the basis for 3G UMTS (see below) cdmaOne First Generation Narrowband CDMA (IS-95). cdma2000 and now virgin is coming to revolute the cdma services

1 comment:

  1. I recently came across your blog and have been reading about cdma technology. I thought I would leave my first comment. I dont know what to say except that I have enjoyed reading. Nice blog. I will keep visiting this blog very often.

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