By Geoff Varrall, Roger Belcher
- Third new release (3G) instant networks are within the works in Europe and Asia, and 2.5G networks that comprise a few 3G positive factors are being rolled out within the United States
- Hands-on advisor to integrating mobile phone or PDA/portable computing device items with current and destiny instant community hardware
- Addresses subject matters corresponding to caliber of carrier (QoS) and repair point agreements (SLAs) from a instant perspective
- Presents an in-depth evaluation of either handset and community and software
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Extra info for 3G Handset and Network Design
Additionally, the capture effect made FM more resilient to (predominantly AM) interference. S. Army introduced FM radios working in the VHF band. The combination of the modulation and the frequency (VHF rather than shortwave) made the FM VHF radios less vulnerable to jamming. Fifty years later, CDMA used wider bandwidth channels to deliver bandwidth gain (rather like wideband FM processor/demodulator gain). Rather like FM, CDMA was, and is, used in military applications because it is harder to intercept.
This helps to keep transmit power (+30 dBm) out of the receiver front end (having to detect signals at –102 dBm or below). The combination of RF and time-division duplexing helps to deliver good sensitivity and provides the option to reduce RF component costs by dispensing with the duplex filter in some GSM phone designs. Another route to reducing component costs is to use the air interface to provide synchronization and frequency correction as part of the handset registration procedure— an S burst to synchronize, an F burst to provide a frequency fix.
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. An alternative is to use orthogonal frequency-division multiplexing (OFDM).