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 factors are being rolled out within the United States
- Hands-on advisor to integrating cellular phone or PDA/portable computer items with current and destiny instant community hardware
- Addresses themes similar to caliber of provider (QoS) and repair point agreements (SLAs) from a instant perspective
- Presents an in-depth evaluate of either handset and community and software
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Additional info for 3G Handset and Network Design
84 MHz). 25 or 5 MHz bandwidth), sometimes via an IF. The RF will be running at 1900/2100 MHz. Essentially, the higher the frequency, the more expensive it is to process a signal. The more we can do at baseband, the lower the cost. This is not to downplay the importance of the RF link. The way in which we use the RF bandwidth and RF power available to us has a direct impact on end-to-end quality of service. Ever since the early experiments of Hughes and Hertz in the 1880s, we have searched for progressively more efficient means of moving information through free space using electromagnetic propagation.
The spark transmitters used to send the first long-distance (trans-Atlantic) radio transmissions in the early 1900s were effective but not efficient either in terms of their use of bandwidth or the efficiency with which the RF power was produced and applied. What was needed was an enabling technology. Thermionic and triode valves introduced in the early 1900s made possible the application of tuned circuits, the basis for channelized frequencies giving long-distance (and relatively) low-power communication.
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. A shortwave or VHF portable transceiver in 1945 weighed 40 kg. Over the next 50 years, this weight would reduce to the point where today a 100 gm phone is considered overweight.