数字蜂窝技术.doc

Digital Cellular TechnologiesSee also????Digital? Cellular Technologies Of The World A1-Net Austrian Name for GSM 900 networks B-CDMA Broadband CDMA. Now known as W-CDMA (see below). To be used in UMTS. Bluetooth The technology enables short-range communication networks between consumer devices incorporating a Bluetooth interface, and is set to greatly improve the way consumers access data and services wirelessly. 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 Code Division Multiple Access. There are now a number of variations of 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). Click HERE for more technical details... cdmaOne First Generation Narrowband CDMA (IS-95). See above. cdma2000 The new second-generation CDMA MoU spec for inclusion in IMT-2000.Click HERE for more technical details. It consists of various iterations, inclusing 1xEV, 1XEV-DO, and MC 3X cdma2000 1XEV 1xEV (Evolution) is an enhancement of the cdma2000 standard of the Telecommunications Industry Association (TIA). The CDMA 1xEV specification was developed by the Third Generation Partnership Project 2 (3GPP2), a partnership consisting of five telecommunications standards bodies: CWTS in China, ARIB and TTC in Japan, TTA in Korea, and TIA in North America. The 1xEV specification is known as TIA/EIA/IS-856 CDMA2000 High Rate Packet Data