By Geoff Varrall, Roger Belcher
- Third iteration (3G) instant networks are within the works in Europe and Asia, and 2.5G networks that include a few 3G positive aspects are being rolled out within the United States
- Hands-on advisor to integrating cellular phone or PDA/portable notebook items with current and destiny instant community hardware
- Addresses issues corresponding 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 resources for 3G Handset and Network Design
At time of writing, 1xEV, rather than the multicarrier IMT2000MCimplementation, is the favored evolution route and is generically known as CDMA2000. IS54TDMA/IMT2000SC and IS95 CDMA/CDMA2000 are supported by a network standard known as IS41. GSM/IMT2000DS is supported by a network standard known as GSM-MAP (Mobile Application Part). 5 MHz CDMA: IMT2000DS IMT2000DS is the air interface standard promoted by Ericsson and the 3GPP1, the third-generation partnership project standards group dedicated to promoting interworking with other standards and, specifically, backward compatibility with GSM— an aspect of particular interest to existing GSM network operators.
The 8 MHz channel is divided into 8000 × 1 kHz subcarriers that are orthogonal from each other. The OFDM signal is created using a Fast Fourier Transform. ) As there are now a total of 8000 subcarriers, the symbol rate per carrier is slow and the symbol period is long compared to any multipath delays encountered on the channel. Continuous pilot bits are spread randomly over each OFDM symbol for synchronization and phase error estimation; scattered pilot bits are spread evenly in time and frequency across all OFDM symbols for channel sounding.
The data is then channel coded—that is, additional bits are added to provide error protection—and then the data is modulated onto an RF carrier, usually with an IF processing stage. In a 3G handset, baseband refers to the information rate of the vocoder, parallel image and video encoder rates, other data inputs, and related channel coding. First-generation handsets therefore have a baseband running at a few kilohertz, and second-generation handsets a few tens of kilohertz. Third-generation handsets have a user data rate that can vary between a few kilohertz and, in the longer term, several megahertz.
3G Handset and Network Design by Geoff Varrall, Roger Belcher