Digital and Data Communication Systems by Martin S. Roden

By Martin S. Roden

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By Martin S. Roden

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19 20 IP Design for Mobile Networks Alternatively, a communication resource can be dedicated to transmission and reception, in which case there needs to be clear demarcation in time between those timeslots allocated to transmission and those allocated to reception. Because of the time separation between transmit and receive resources, this technique is termed Time Division Duplex (TDD). The Digital Enhanced Cordless Telecommunications (DECT) system is one example of a communication system that uses TDMA with TDD.

Enhanced IMT-2000 systems: Includes the evolution of WCDMA systems to support High-Speed Packet Access (HSPA) and the evolution of cdma2000 1xRTT to support EVolution Data Only (EV-DO) high-speed packet capabilities. The evolution of the access systems described in this chapter will clearly demonstrate how IP is increasing in relevance to the traditional cellular network designer, both from a transport and services perspective. Chapter 3, “All-IP Access Systems,” will then provide detail of those access systems that have been designed as end-to-end IP systems.

615 milliseconds, the use of the interleaver in GPRS to combat burst errors adds an additional 18 milliseconds to the packet transmission delay. Radio systems frequently employ a range of techniques for mitigating multipath interference. For example, the GSM system includes a combination of equalization, frequency hopping, and interleaving in order to combat Rayleigh fading and Inter-Symbol Interference. Chapter 1: Introduction to Radio Systems Complexity of Multipath Mitigation As mobile radio systems move to increasingly supporting mobile broadband IP services, the overall peak throughput speeds required to be supported necessarily increase and the symbol durations correspondingly decrease.

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