Download PDF by Juha Korhonen: Introduction to 3G Mobile Communications

By Juha Korhonen

ISBN-10: 158053287X

ISBN-13: 9781580532877

ISBN-10: 158053418X

ISBN-13: 9781580534185

An creation to third-generation (3G) cellular conversation process rules, suggestions and functions. It provides the fundamentals of UMTS structures with no getting slowed down in complicated arithmetic. the amount comprises: an summary of UMTS platforms; details on 3G expertise criteria; a assessment of the wideband CDMA air interface; information on community structure; and tips in community making plans and administration. different key themes contain new techniques within the UTMS community, 3G process signalling techniques, 3G providers and functions, modulation and coding, and standardization agencies and teams. furthermore, the paintings takes a glance on the way forward for instant communications, projecting the continuing evolution of 3G structures.

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Extra resources for Introduction to 3G Mobile Communications

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The examples in this section are wideband CDMA (WCDMA) specific. 1 Radio-Channel Access Schemes The radio spectrum is a scarce resource. Its usage must be carefully controlled. Mobile cellular systems use various techniques to allow multiple users to access the same radio spectrum at the same time. In fact, many systems employ several techniques simultaneously. This section introduces four such techniques: • Frequency-division multiple access (FDMA); • Time-division multiple access (TDMA); • Code-division multiple access (CDMA); • Space-division multiple access (SDMA).

Originally it was the purpose of the International Telecommunication Union (ITU) to have only one truly global 3G specification, but for both technical and political reasons this did not happen. 5); • SAT-CDMA/49 LEO Satellites in seven planes at 2,000 km (South Korea TTA); • DECT Terrestrial (ETSI Project EP DECT); • TD-SCDMA/Time-Division Synchronous CDMA (China Academy Telecommunications Technology); Introduction to 3G Mobile Communications Proposals for 3G Standard 15 • SW-CDMA/Satellite Wideband CDMA (European Space Agency); • SW-CTDMA/Satellite Wideband Hybrid CDMA/TDMA (European Space Agency); • ICO RTT/10 MEO Satellites in two planes at 10,390 km (ICO Global Communications); • W-CDMA/WCDMA (Japan ARIB); • CDMA II/Asynchronous DS-CDMA (South Korea TTA); • CDMA I/Multiband Synchronous DS-CDMA (South Korea TTA); • UTRA UMTS/UMTS Radio Access (ETSI SMG2); • Horizons/Horizons Satellite System (Inmarsat).

The “unsent” data from idle slots will be sent during the normal slots using a lower spreading ratio. It is also possible to reduce the amount of data to be sent or puncture it. Introduction to 3G Mobile Communications Handovers 43 The use of compressed mode is mandatory for UEs that do not have dual receivers. It makes the measurements for intersystem and interfrequency HOs possible. However, compressed mode also results in poorer performance, as it means either less data over the air interface (reduced data or puncturing) or more interference and higher code usage (lower spreading ratio).

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Introduction to 3G Mobile Communications by Juha Korhonen


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