Download PDF by Geoff Varrall, Roger Belcher: 3G Handset and Network Design

By Geoff Varrall, Roger Belcher

ISBN-10: 0471229369

ISBN-13: 9780471229360

  • Third iteration (3G) instant networks are within the works in Europe and Asia, and 2.5G networks that include a few 3G gains are being rolled out within the United States
  • Hands-on consultant to integrating mobile phone or PDA/portable laptop items with current and destiny instant community hardware
  • Addresses issues comparable to 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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Sample text

The disadvantage is that with the GSM implementation of GMSK, because of the filtering, decision points on the modulation trellis are not always obtained, resulting in some residual bit errors. GMSK is a two-level modulation scheme—that is, the two phase states can represent a 0 or a 1. Higher-level modulation states can be used to carry more bits per symbol. A fourstate modulation scheme, for example, QPSK (Quadrature Phase Shift Keying) has 2 bits per symbol (00, 01, 11, 10), an eight-level modulation scheme can carry 3 bits per symbol, a 16-level modulation scheme can carry 4 bits per symbol, a 1024-level modulation scheme (used in fixed point-to-point, for example) can carry 10 bits per symbol.

It is more correctly described as a multicarrier technique. Present examples of OFDM can be found in wireline ADSL/VDSL, fixed access wireless, wireless LANs, and digital TV. Standard terrestrial digital TV broadcasting in Europe and Asia uses QPSK. 6 Mbps data rate in an 8 MHz channel. 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.

However, the technology used in these early CDMA networks has translated forward into 3G handset and network hardware and software. It is easier to qualify some of the design options in 3G handsets if we first cover the related design and performance issues highlighted by CDMA implementation to date. The original principle of CDMA, which still holds true today, is to take a relatively narrowband modulated signal and spread it to a much wider transmitted bandwidth. The spreading occurs by multiplying the source data with a noise like high-rate pseudorandom code sequence—the pseudorandom number (PN).

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3G Handset and Network Design by Geoff Varrall, Roger Belcher

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