Proceedings ArticleDOI
On antenna- and frequency diversity in GSM related systems (GSM-900, DCS-1800, and PCS1900)
Preben Mogensen,J. Wigard +1 more
- Vol. 3, pp 1272-1276
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TLDR
This paper analyze the performance of two branch antenna diversity in GSM related systems using several combining techniques for both up- and downlink and antenna diversity results for a non-ideal antenna configuration are presented.Citations
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Journal ArticleDOI
The performance of polarization diversity schemes at a base station in small/micro cells at 1800 MHz
TL;DR: In this article, the authors evaluated the relationship between cross-polarization discrimination (XPD), signal cross correlation, and polarization diversity gain with horizontal/vertically polarized reception at the base station (BS) end at 1800 MHz.
Patent
A radio communication system selectively using multicast with variable offset time
TL;DR: In this paper, a digital base station improves downlink coverage by allocating multicast and non-multicast channels based on the propagation property of an RF link between a mobile unit and a base station.
Proceedings ArticleDOI
Improved interface between link level and system level simulations applied to GSM
TL;DR: A novel method for interfacing between link level simulator and system level simulator types is presented, to extract more information than usual from the link level simulation, and to include multipath fading in a system level simulation that operates on TDMA burst level.
Proceedings ArticleDOI
Transmitter diversity with antenna hopping for wireless communication systems
H. Olofsson,M. Almgren,M. Hook +2 more
TL;DR: This paper investigates one of these methods, referred to as antenna hopping, which consists in transmitting consecutive bursts of information on different antennas, and shows the maximal gain can be obtained by using frequency hopping on only 4 frequencies instead of 8 without antenna hopping.
Patent
System for improving the quality of a received radio signal
TL;DR: In this article, a delay spread is created in a digital radio signal to reduce the coherence bandwidth and facilitate frequency hopping to reduce effect of fading losses within an enclosed propagation environment, where the carrier frequency of the signals is hopped between at least two frequencies and the receiver processes the resulting signals.
References
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Book
Microwave Mobile Communications
William C. Jakes,Donald C. Cox +1 more
TL;DR: An in-depth and practical guide, Microwave Mobile Communications will provide you with a solid understanding of the microwave propagation techniques essential to the design of effective cellular systems.
Journal ArticleDOI
Polarization diversity in mobile communications
TL;DR: Signals in the vertical and horizontal polarizations at the base station have been measured by transmitting from a principally vertically polarized mobile by measuring the envelopes and the means differed by 7 dB and 12 dB when the mobile was in urban and suburban areas, respectively.
Effects on Portable Antennas by the Presence of a Person
TL;DR: In this article, the influence of the presence of a person on the performance of antennas for hand-held portable telephones has been investigated by applying the finite-difference time-domain (FDTD) technique to a model of the telephone with a lambda /4 monopole antenna and a simple hand-head model of operator.
Journal ArticleDOI
Effects on portable antennas of the presence of a person
TL;DR: This work has shown how input impedance, far-field radiation pattern, radiation efficiency, and the magnitude of the near field are affected by the presence of the human body.
Journal ArticleDOI
Correlation Bandwidth and Delay Spread Multipath Propagation Statistics for 910-MHz Urban Mobile Radio Channels
David Cox,R. Leck +1 more
TL;DR: Distributions of delay spread and correlation bandwidth at 0.9 and 0.5 correlation for Gaussian wide-sense stationary uncorrelated scattering channels associated with 100 small-scale areas at different locations within a 2 × 2.5 km region of New York City are presented.