Mobitex

Abstract: Mobile data networks offer a cost-effective and efficient alternative for data communication. In order to present some aspects of mobile data technology, this article offers some insight into the basic networking layers of a popular and widely deployed network, MOBITEX. MOBITEX technology offers a versatile architecture to support wireless packet data service inside an extended geographical area with internetwork roaming and interoperability features. This technology has become quite popular, mainly due to its open architecture and its vast equipment/applications availability. The authors provide an overview of the MOBITEX architecture, services, and subscription types, and a detailed examination of the network, data link, and physical layers. The power-saving features of MOBITEX are also discussed.

Abstract: This paper presents low-power design techniques at the architectural level for design of decimation filters in a digital IF receiver for wide-area wireless data networks. A multimode decimation filter design implementing both Mobitex and Ardis networks is described. The power is reduced by a factor of 1422 and the area reduced by a factor of 7.85 compared to an optimized single-mode two-stage design. A new multistage decimation filter design tool is also presented, which compares alternative architectures on figures of merit which the low-power designer can map into technology-dependent area and power costs.

Abstract: This paper is a systems engineering overview of a state-of-art packet switched radio data system-the Mobitex system. RAM Mobile Data operates Mobitex systems in the US and the UK. Mobitex systems are also in operation in Scandinavia and Canada. The system architecture is 'open', which allows any company to enter the wireless data business by providing radio modems and/or application software conforming to the Mobitex interface specification. This paper first outlines the Mobitex network architecture, network protocol, RF system design and the Mobitex 'open' air interface. Finally, the spectral efficiency and response time for transmission of short messages using a wireless packet data network and present day analog cellular systems are compared. It is concluded that a wireless packet data network is superior to analog cellular systems both in terms of spectral efficiency and response time for short data messages. >