Search results for "Antenna diversity"

showing 3 items of 13 documents

Experimental characterization and mitigation of turbulence induced signal fades within an ad hoc FSO network

2014

Optical beams propagating through the turbulent atmospheric channel suffer from both the attenuation and phase distortion. Since future wireless networks are envisaged to be deployed in the ad hoc mesh topology, this paper presents the experimental laboratory characterization of mitigation of turbulence induced signal fades for two ad hoc scenarios. Results from measurements of the thermal structure constant along the propagation channels, changes of the coherence lengths for different turbulence regimes and the eye diagrams for partially correlated turbulences in free space optical channels are discussed. Based on these results future deployment of optical ad hoc networks can be more strai…

Wireless networkWireless ad hoc networkComputer sciencebusiness.industryMesh networkingOptical communicationÒpticaAntenna diversityAtomic and Molecular Physics and OpticsOpticsComputer Science::Networking and Internet ArchitectureElectronic engineeringbusinessComunicació i tecnologiaCommunication channelFree-space optical communicationCoherence (physics)Optics Express
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Statistical properties of the capacity of Rice channels with MRC and EGC

2009

In this paper, we have studied the statistical properties of the capacity of Rice channels for both maximal ratio combining (MRC) and equal gain combining (EGC) schemes. We have analyzed the effect of the number of diversity branches and the amplitude of the line-of-sight (LOS) components in the diversity branches on the statistics of the channel capacity. Specifically, we have derived analytical expressions for the probability density function (PDF), cumulative distribution function (CDF), level-crossing rate (LCR), and average duration of fades (ADF) of the capacity of Rice channels when using MRC and EGC. It is observed that if the number of diversity branches or the amplitude of the LOS…

business.industryCumulative distribution functionProbability density functionrespiratory systemAntenna diversityChannel capacitySignal-to-noise ratioAmplitudeStatisticsWirelessMaximal-ratio combiningbusinessTelecommunicationshuman activitiesComputer Science::Information TheoryMathematics2009 International Conference on Wireless Communications & Signal Processing
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Introduction of Multiflow for HSDPA

2012

This paper introduces a multi-cell transmission scheme for High-Speed Downlink Packet Access (HSDPA) networks, called Multiflow. In this concept, downlink data is transmitted to a user terminal at the border of two cells from one or both of the cells. The cells may belong to same NodeB or to two different NodeBs. The data flows are separated by different scrambling codes used by each associated cell, thus the flows can be treated independently. This provides increased multi-user diversity by means of flexibility in downlink resource management, in addition to the spatial diversity of multiple transmission locations. Another important gain mechanism for this scheme is realized by short-term …

ta113Computer scienceNetwork packetbusiness.industryHSDPALoad balancing (computing)Antenna diversityMonipistelähetysScramblingHandoverTelecommunications linkNetwork performanceNodeBbusinessMultipoint transmissionComputer network2012 5th International Conference on New Technologies, Mobility and Security (NTMS)
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