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 computing device items with current and destiny instant community hardware
- Addresses subject matters reminiscent of caliber of carrier (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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3rd iteration (3G) instant networks are within the works in Europe and Asia, and a couple of. 5G networks that include a few 3G beneficial properties are being rolled out within the United StatesHands-on advisor to integrating cellphone or PDA/portable computing device items with current and destiny instant community hardwareAddresses subject matters comparable to caliber of carrier (QoS) and repair point agreements (SLAs) from a instant perspectivePresents an in-depth evaluate of either handset and community and software program
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Extra info for 3G Handset and Network Design
This seems to be a sensible way to increase bandwidth efficiency, given that eight-level modulation can carry 3 bits per symbol and 16 level can carry 4 bits per symbol. 7 QPSK, MSK, and GMSK compared. 0 0 Symbol 17 18 Chapter 1 It is necessary, however, to qualify the impact of the choice of modulation on the link budget. For every doubling of modulation state, an additional 3 dB of link budget is required to maintain the same demodulation bit error performance. Therefore, 8 PSK needs 3 dB more link budget than QPSK, and 16-level QAM needs 3 dB more link budget than 8 PSK.
IS95 defines the dual-mode AMPS/CDMA technology platform, IS96 the speech coding (currently either 8 kbps or 13 kbps), IS97 and 98 the performance criteria for base stations and handsets, and IS99 data service implementation. What follows is therefore a description of the IS95 air interface, which then served as the basis for CDMA2000. In IS95, there is one pilot channel, one synchronization channel, and 62 other channels corresponding to 64 Walsh codes. All 62 channels can be used for traffic, but up to 7 of these may be used for paging.
On the other hand, as we move to higher frequencies, we have access to more bandwidth.. For example, we have only 370 kHz of bandwidth available at long wave; we have 270 GHz available in the millimetric band (30 to 300 GHz). Also, as frequency increases, range decreases. (Propagation loss increases with frequency). This is good news and bad news. A good VHF transceiver—for example, at 150 MHz—can transmit to a base station 40 or 50 kilometers away, but this means that very little frequency reuse is available.
3G Handset and Network Design by Geoff Varrall, Roger Belcher