Channels, Propagation and Antennas for Mobile Communications

Vaughan, Rodney G.; Andersen, Jørgen Bach

doi:10.1049/pbew050e

Cited by 581 publications

(386 citation statements)

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“…Even though the Rayleigh-fading case is the most common in practice, the more general assumption of a mixture of unpolarised stochastic and polarised deterministic components is still of great interest [24,25]. Therefore, we will investigate the MEG of an antenna in different types of fields depending on whether the field is purely stochastic or it also contains a deterministic component.…”

Section: Meg In Ricean Channelsmentioning

confidence: 99%

Mean effective gain of antennas in a wireless channel

Glazunov

Molisch

Tufvesson

2009

IET Microw. Antennas Propag.

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Abstract:The mean effective gain (MEG) is one of the most important parameters for the characterisation of antennas in wireless channels. An analysis of some fundamental properties of the MEG is provided and corresponding physical interpretations are given. Three points are analysed in detail: (i) closed-form expressions for MEG in a mixed environment with both stochastic and deterministic components are provided, showing that the MEG can be written as a sum of gains for the deterministic and stochastic components, (ii) it is shown that under some assumptions, the propagation channel and the antenna are equivalent in the sense that the impact of the channel cross-polarisation ratio (XPR) and the antenna effective cross-polar discrimination on the MEG are symmetrical, (iii) based on the fact that MEG depends on random variables, such as the XPR and antenna rotations because of user's movements, the average, the minimum and maximum MEG of antennas are defined, respectively. Finally, the maximum effective gain of antennas is derived and shown that it is bounded by 4ph rad , where h rad is the radiation efficiency of the antenna.

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Section: Meg In Ricean Channelsmentioning

confidence: 99%

Mean effective gain of antennas in a wireless channel

Glazunov

Molisch

Tufvesson

2009

IET Microw. Antennas Propag.

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“…PSS-sopt is equivalent to equal gain combining (EGC) [28]. The capacity is evaluated in a similar way.…”

Section: Phase Shift Preprocessing and Selection (Pss)mentioning

confidence: 99%

Antenna subset selection in measured indoor channels

Almers

Santos

Tufvesson

et al. 2007

IET Microw. Antennas Propag.

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Antenna subset selection can greatly reduce the implementation complexity of multiple input multiple output (MIMO) systems while retaining most of their benefits. This paper investigates the diversity gain and capacity of such systems in wireless personal area networks. Considered scenarios include both the communication between access point to a laptop, and between two hand held devices. We analyze the performance of different antenna selection algorithms and signal combining methods in measured dual-polarized narrow band and wide band propagation channels. We find that line-of-sight and non-line-of-sight situations have fairly similar behavior. Different polarizations result in similar signal-to-noise ratio gains when the multiple antennas are used for diversity, but result in noticeably different capacities in spatial-multiplexing systems. We also find that radio frequency (RF) preprocessing of the signals is less effective for hand held handsets with non-uniform antenna arrangements than for uniform linear arrays. For communications between hand held devices, simple selection (of one out of four antennas) shows extremely high performance gains compared to no-selection. Finally, we compare bulk selection (same antenna subset is used for all frequency sub-channels) to per-tone selection (different antenna subsets can be used for each frequency sub-channel) for wide band channels. Bulk selection together with RF preprocessing performs almost a s well as per-tone selection for some scenarios. IET Microwaves, Antennas & PropagationThis work may not be copied or reproduced in whole or in part for any commercial purpose. Permission to copy in whole or in part without payment of fee is granted for nonprofit educational and research purposes provided that all such whole or partial copies include the following: a notice that such copying is by permission of Mitsubishi Electric Research Laboratories, Inc.; an acknowledgment of the authors and individual contributions to the work; and all applicable portions of the copyright notice. Copying, reproduction, or republishing for any other purpose shall require a license with payment of fee to Mitsubishi Electric Research Laboratories, Inc. All rights reserved. Abstract: Antenna subset selection can greatly reduce the implementation complexity of multiple input multiple output (MIMO) systems while retaining most of their benefits. This paper investigates the diversity gain and capacity of such systems in wireless personal area networks. Considered scenarios include both the communication between access point to a laptop, and between two handheld devices. We analyse the performance of different antenna selection algorithms and signal combining methods in measured dual-polarised narrowband and wideband propagation channels. We find that line-of-sight and non-line-of-sight situations have fairly similar behaviour. Different polarisations result in similar signal-to-noise ratio gains when the multiple antennas are used for diversity, but result in noticeably different ca...

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“…This technology uses multiple antennas at both transmitter and receiver to improve the channel capacity by severalfold. Therefore, compact and broadband multi-antenna systems are required for future high-capacity mobile terminals [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

A Mimo Antenna Decoupling Network Composed of Inverters and Coupled Split Ring Resonators

Zhao¹,

Liu²,

Cai³

2017

PIER C

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Abstract-A decoupling network for a pair of strongly coupled MIMO antennas is presented. The decoupling network is composed of two inverters and two split ring resonators (SRRs) that are also coupled. By properly transforming the mutual admittance of the original coupled antennas and properly designing the coupling between the two SRRs, more than 20 dB isolation between the two antennas can be achieved while their respective matching performances remain good. To validate the concept, a microstrip decoupling network is designed and implemented for a pair of wideband printed monopole antenna elements. Measurement results have demonstrated that nearly 10% bandwidth for 20 dB isolation can be achieved. Measured radiation patterns have demonstrated a significant reduction of the correlation coefficient, which makes the proposed technique a promising candidate for both current and future generations of MIMO-enabled mobile terminals.

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Channels, Propagation and Antennas for Mobile Communications

Cited by 581 publications

References 0 publications

Mean effective gain of antennas in a wireless channel

Mean effective gain of antennas in a wireless channel

Antenna subset selection in measured indoor channels

A Mimo Antenna Decoupling Network Composed of Inverters and Coupled Split Ring Resonators

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