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Showing papers on "Cellular network published in 1986"


Journal ArticleDOI
TL;DR: Two synchronous multiple access schemes, TDMA and CDMA, are proposed for fiber optic networks using optical signal processing, using a central modelocked laser which also serves as the source for each station.
Abstract: Two synchronous multiple access schemes, TDMA and CDMA, are proposed for fiber optic networks using optical signal processing. Network synchronization is achieved by using a central modelocked laser which also serves as the source for each station. The data are converted into a high-bandwidth optical signal using electrooptic modulators. The accessing schemes use optical fiber delay lines. The feasibility of these schemes is discussed.

220 citations


Book
01 Jan 1986
TL;DR: Elements of Satellite Communication as mentioned in this paper include: Satellite Spread Spectrum Comm.. Very Small Aperture Terminal Networks. Satellite Packet Comm.. Digital Modulation and Carrier and Symbol Timing Synchronization.
Abstract: Elements of Satellite Communication. Communication Satellites & Orbital Mechanics. Earth Stations. Satellite Link. Time Division Multiple Access. Efficient Techniques. Satellite Packet Comm.. Digital Modulation. Carrier & Symbol Timing Synchronization. Satellite Spread Spectrum Comm.. Very Small Aperture Terminal Networks. Mobile Satellite Comm.

185 citations



Journal ArticleDOI
A. Gamst1, E.-G. Zinn1, R. Beck1, R. Simon1
TL;DR: The fundamental ideas behind a cellular network design program are described and by the aid of a generalization of the notion of a radio cell it becomes possible to integrate hitherto isolated areas of investigation.
Abstract: The fundamental ideas behind a cellular network design program are described. By the aid of a generalization of the notion of a radio cell it becomes possible to integrate hitherto isolated areas of investigation. The elementary design steps making up the program are outlined together with their inter-connections. The program may be used to design new networs, analyze or extend existing ones, and study system varians and design strategies in a general nonhomogeneous setting.

32 citations


Patent
14 Aug 1986
TL;DR: In this article, a narrow-band time division multiple access method (FD/TDMA) is used to avoid the disadvantages of the known FDMA (FDMA) and TDMA (time division multiple Access) methods.
Abstract: The method is intended to avoid the disadvantages of the known FDMA (frequency division multiple access) methods and TDMA (time division multiple access) methods. According to the invention, a narrow-band time division multiple access method (FD/TDMA) is used, that is to say a combined frequency division multiple access/time division multiple access method. Transmission preferably occurs in n radio channels with a transmission rate of m kilobit/s, in such a manner that the total transmission rate is r = m . n

26 citations



Proceedings ArticleDOI
17 Mar 1986

3 citations


Proceedings ArticleDOI
A. Gamst1
20 May 1986
TL;DR: In this article, the problem of performance of radio network design strategies for cellular systems under uncertain load conditions is investigated, and three strategies are defined in sufficient detail, among them two possible interpretations of the general cell splitting methodology.
Abstract: The paper deals with the problem of performance of radio network design strategies for cellular systems under uncertain load conditions As a first exploratory step, it examines the simplest possible case of a one-dimensional traffic region with homogeneous propagation conditions Three strategies are defined in sufficient detail, among them two possible interpretations of the general cell splitting methodology Our results indicate that the stable existence of networks composed of cells of different size is crucial to the efficiency of a radio network design strategy

3 citations


Patent
25 Aug 1986

3 citations


Journal ArticleDOI
TL;DR: This paper classifies a variety of techniques for increasing frequency spectrum utilization and clarified that the proposed ``new channel assignment algorithm'' is more efficient than other algorithms through simulation analysis.
Abstract: In mobile radio communication systems, one of the most significant problems is to use the radio frequency spectrum as efficiently as possible, because the radio frequency spectrum is finite. This paper classifies a variety of techniques for increasing frequency spectrum utilization. Next, it is clarified that our proposed ``new channel assignment algorithm'' is more efficient than other algorithms through simulation analysis.

2 citations



Proceedings ArticleDOI
D.W.J. Holmes1
20 May 1986
TL;DR: The first generation of cordless telephones in the UK are similar to their US counterparts, using 8 channels in the 1.6 and 47 MHz bands, but must be approved to a specification which includes a requirement to provide security of acess to the telephone line.
Abstract: There is a growing demand for portable telephones in the UK. In addition to the excellent but expensive service provided by the cellular telephone networks, there is a large demand for low - cost products which can provide limited coverage around a house or factory premises. The devlopment of suitable systems to make best use of any available spectrum presents interesting technical and commercial challenges. The first generation of cordless telephones in the UK are similar to their US counterparts, using 8 channels in the 1.6 and 47 MHz bands, but must be approved to a specification which includes a requirement to provide security of acess to the telephone line. They must also give similar speech performance to that of a wired telephone. The specification, first published in 1982, has recently been extended to include a requirement for continuous security handshaking, and to allow attatchment to leaky feeder antennas. Advanced cordless telecommunications systems are now under study. These will use digital modulation, which will provide higher traffic capacity and allow the possibility of speech privacy. The specification for these second - generation CTs is now well advanced and it is expected that they will be commercially available in three years or so. Propagation in and around buildings has been extensively measured, at 900MHz and 60GHz, including an investigations of diversity and the use of leaky feeders. The 175 - 220 MHz band has been re-allotted for mobile systems in the UK, athough it will continue to be used for television broadcasting in neighbouring countries. Five bands each of 1 MHz bandwidth have been allocated for business cordless applications. The specifications for these are now under discussion.


Proceedings ArticleDOI
15 May 1986
TL;DR: Multiple high bandwidth signals can be time division multiplexed to give continuous data transmission at the optical source bandwidth, e.g. 1016 Hz.
Abstract: Multiple high bandwidth signals can be time division multiplexed to give continuous data transmission at the optical source bandwidth, e.g. 1016 Hz. The individual components need not operate anywhere near this speed.

Proceedings ArticleDOI
20 May 1986
TL;DR: The Cellular Services Compatibility Seminar (CSCS) has developed transmission loss guidelines for the three types of interconnection links between the Cellular Mobile Carrier (CMC) network and the Local Exchange Carrier (LEC) network.
Abstract: The Cellular Services Compatibility Seminar (CSCS), has developed transmission loss guidelines for the three types of interconnection links between the Cellular Mobile Carrier (CMC) network and the Local Exchange Carrier (LEC) network. This paper documents the rationale behind these guidelines. The overall goal was to provide the capability for a call between a mobile user and a land user to have performance equivalent to that of a similar call between two land users. Other factors which were taken into consideration were consistency with existing transmission plans, compatibility with the capabilities of existing facilities and equipment, and flexibility for changes with the introduction of new technology. The actual loss values were based on expected speech power levels, minimizing the variability of losses through the Public Switched Network (PSN), and estimated customer perception of end-to-end voice service.