TAILIEUCHUNG - Áp dụng DSP lập trình trong truyền thông di động P3

Third generation (3G) mobile radio standards are the result of a massive worldwide effort involving many companies since the mid-1990s. These systems will support a wide range of services, with voice and low rate data to high data rate services up to 144 Kbps in vehicular outdoor environments, 384 Kbps in pedestrian outdoor environments, and 2 Mbps in indoor environments. Both circuit and packet switched services with variable quality of service requirements will be supported. | The Application of Programmable DSPs in Mobile Communications Edited by Alan Gatherer and Edgar Ausländer Copyright 2002 John Wiley Sons Ltd ISBNs 0-471-48643-4 Hardback 0-470-84590-2 Electronic 3 The Role of Programmable DSPs in Dual Mode 2G and 3G Handsets Chaitali Sengupta Nicolas Veau Sundararajan Sriram Zhenguo Gu and Paul Folacci Introduction Third generation 3G mobile radio standards are the result of a massive worldwide effort involving many companies since the mid-1990s. These systems will support a wide range of services with voice and low rate data to high data rate services up to 144 Kbps in vehicular outdoor environments 384 Kbps in pedestrian outdoor environments and 2 Mbps in indoor environments. Both circuit and packet switched services with variable quality of service requirements will be supported. The key challenges in designing 3G modems arise from the signal processing dictated by the underlying CDMA-based air interface with a chip rate of Mcps for the FDD DS mode explained later the high data rate requirements and the multiple and variable rate services that need to be supported simultaneously. Due to the various service scenarios - low-end voice to high-end high data rate - flexibility of the design is imperative. In telecommunications a multi-mode mobile is one that can support many different telecommunication standards with different radio access technologies. For example the dualband mobiles GSM DCS are not considered as multi-mode mobiles because it uses the same radio access technology and the difference is only on the frequencies. By looking at the origin of the dual-mode system we find two main drivers. Operator driven when ETSI developed the GSM specifications it wasn t expected that the second generation 2G mobile would be backward compatible with their analog 1G counterparts. This was acceptable because the number of 1G users was negligible compared to the forecasted 2G users. On the other hand in the 1980s it was quite .

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