By Geoff Varrall, Roger Belcher
- Third new release (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 cellphone or PDA/portable computing device items with current and destiny instant community hardware
- Addresses issues resembling 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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Additional resources for 3G Handset and Network Design
It is usual to refer to each sequence or code as a channel. 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.
The PN as a digital number appears to be random but is actually predictable and reproducible having been obtained from a prestored random number generator. The product of the source data and the PN sequence becomes the modulating signal for the RF carrier. At the receive end, the signal is multiplied by the same prestored PN sequence that was used to spread the signal, thereby recovering the original baseband (source) digital data. Only the signal with the same PN sequence despreads. Effectively, the PN sequences characterize the digital filter, which correlates or captures wanted signal energy, leaving unwanted signal energy down in the noise floor.
An example of TDMA used in two-way radio is the European Trans European Trunked Radio Access (TETRA) standard. 17 ms, so that up to 4 users can be modulated simultaneously onto the same 25 kHz RF carrier. TETRA is presently implementing a fairly simple bandwidth-on-demand protocol where a single user can be given one, two, three, or four time slots within a frame. This means that one relatively high rate user per RF channel or four relatively low rate users or any combination in between can be supported.