Topic: Telecommunication Engineering
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Communications Core Meets 3g Wireless Handset Challenges
THIRD-GENERATION (3G) mobile handsets may still be in the prototype stage, but analysts predict that by 2004, global sales of digital cellular handsets will be on the order of $994 million ( . 1) . While slated to offer a wide range of services, including voice, data, location assistance, audio, still pictures, and streaming video, these complex and multipurpose devices will form the foundation for applications and services that are yet to be imagined.
Having efficient code compilability means that 90 percent or more of the production code must be able to be developed by leveraging the C source code and the compiler associated with the specific DSP core. The benefit of this compil- ability is that it minimizes the need to hand code in assembly language.
Telecommunications Union (ITU), typically defined as IMT-2000 (now often referred to as 3G). The IMT- 2000 specification defines data rates for specific operating environments that can be served by 3G. For instance, with indoor stationary picocells, the minimum data rate is 2 Mb/s; for the local pedestrian microcell, the minimum data rate is 384 kb/s; and for the regional or vehicular macrocell, the minimum rate is 144 kb/s. In all of these cells, the 3G system needs to simultaneously support multiple types of traffic, including high-speed Internet, two-way video, images, voice, and location services.
3G systems, enabled by technologies, such as cdma2000 and wideband code- division multiple access (WCDMA), will allow handset users to connect to the Internet/Intranet at data rates described earlier. Higher data rates are not the only defining specification of 3G wireless. In fact, 3G systems will increase voice capacity up to two times, employing 8- phase-shift-keying (8-PSK) and quadrature-phase-shift-keying (QPSK) modulation schemes.
Source: www.alphamultimedia.com
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