By Geoff Varrall, Roger Belcher
- Third iteration (3G) instant networks are within the works in Europe and Asia, and 2.5G networks that contain a few 3G positive aspects are being rolled out within the United States
- Hands-on advisor to integrating mobile phone or PDA/portable computer items with current and destiny instant community hardware
- Addresses themes akin to caliber of carrier (QoS) and repair point agreements (SLAs) from a instant perspective
- Presents an in-depth assessment of either handset and community and software
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Additional info for 3G Handset and Network Design
The symbol states become closer together in terms of phase and frequency. Given that the vector is rotating, a timing error translates into a phase or frequency error. Multipath effects cause phase rotation and attenuation. In CDMA, these are partly, though not totally, taken out by the RAKE receiver. Given that none of these adaptive mechanisms are perfect, timing ambiguity translates into demodulator error rate. This effect becomes more severe as bit rate and symbol rate increases. Thus, while higherlevel modulation options promise performance gains, these gains are often hard to realize in larger cells, particularly in edge-of-cell conditions where power is limited and severe multipath conditions may be encountered.
Wide area two-way radio networks in the UHF band typically use 8 MHz or 10 MHz duplex spacing, 800/900 MHz cellular networks use 45 MHz duplex spacing, GSM 1800 uses 95 MHz duplex spacing, PCS 1900 uses 80 MHz, and IMT2000 (3G) uses 190 MHz duplex spacing. In the United States, there are also proposals to refarm 30 MHz of TV channel bandwidth in the 700 MHz band for 3G mobile services. 1 shows the duplex spacing implemented at 800/900 MHz for GSM in Europe, CDMA/TDMA in the United States, and PDC (Japan’s 2G Personal Digital Cellular standard) in Japan.
This is known as the coherence bandwidth—the bandwidth over which all the signal is affected by multipath fading. As the bandwidth increases, parts of the signal remain unaffected. Fading is a phase cancellation effect and as such is frequency-specific. As the fading depth reduces it becomes progressively easier to follow the multipath fading with a power control loop. In practice, both slow fading and fast fading (at least for slow mobility users) in a relatively wideband channel can be compensated for by decreasing and increasing the RF power of the handset in sympathy with the fade.
3G Handset and Network Design by Geoff Varrall, Roger Belcher