Signal correlation including antenna coupling

Derneryd, A.; Kristensson, Gerhard

doi:10.1049/el:20040140

Cited by 40 publications

(27 citation statements)

References 5 publications

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“…Consequently, 3-D correlation models have been called for. Recently, far-field formulas have been suggested to calculate the complex crosscorrelation coefficients of dipole antennas in a 3-D model, which includes the effects of mutual coupling [2], [3]. Yet, even for this 3-D model, results are only valid for cross-polarization ratios XPR , that is, for conventional orthogonal polarization diversity.…”

Section: A Spatial Correlation Modelmentioning

confidence: 99%

“…In a true polarization scheme, the angular difference between two dipoles is defined as (2) where and are the orientation angles of the dipoles. By representing an angular separation in true polarization diversity as equivalent to the spatial separation distance, a new correlation function can be defined by (3) where .…”

Section: B Angular Correlation Modelmentioning

confidence: 99%

“…Losses due to correlation are quantified in [1]. Mutual coupling effects on the correlation coefficients are studied in [2] and three-dimensional (3-D) models for obtaining the correlation coefficients are described in [3]. In many studies, the correlation factor is employed to study MIMO system performance by assuming that the correlation among receive antennas is independent from the correlation between transmit antennas, that is, with no transmit-receive cross-correlation.…”

Section: Introductionmentioning

confidence: 99%

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Estimating Combined Correlation Functions for Dipoles in Rayleigh-Fading Scenarios

Valenzuela-Valdés

Martinez-Gonzalez

Sánchez‐Hernández

2007

Antennas Wirel. Propag. Lett.

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Abstract-While the spatial correlation function between two dipoles is well known, the angular correlation function for different arbitrary inclination angles in transmission and reception is not available in the literature. In this paper, a novel angular correlation function is proposed for two dipoles with arbitrary inclination angles between transmission and reception, which is useful for true polarization diversity schemes. Likewise, two original functions for estimating combined spatial-angular correlation are proposed. The novel functions are used with previously reported results and validated for Rayleigh-fading scenarios with isotropic scattering using a reverberation chamber.

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Section: A Spatial Correlation Modelmentioning

confidence: 99%

Section: B Angular Correlation Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Estimating Combined Correlation Functions for Dipoles in Rayleigh-Fading Scenarios

Valenzuela-Valdés

Martinez-Gonzalez

Sánchez‐Hernández

2007

Antennas Wirel. Propag. Lett.

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“…Indeed, in the latter, it is difficult to pack multiple antennas elements closely within the confines of a mobile handset whilst maintaining good isolation since the antennas are strongly coupled with each other and share a common ground and near field coupling [8]. Their pattern correlation coefficient is directly related to the coupling and a low value increases the achievable transmission speeds [9]. Many studies have been carried out to reduce coupling between multiple antenna elements.…”

Section: Introductionmentioning

confidence: 99%

Compact and closely spaced tunable printed F‐slot multiple‐input–multiple‐output antenna system for portable wireless applications with efficient diversity

Elfergani

Hussaini

Rodriguez

et al. 2014

IET Science, Measurement & Technology

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In this work, miniaturized tunable two-antenna MIMO systems composed of printed F-slot shaped is developed to operate in the GPS, PCS, DCS and UMTS bands. The two-element MIMO antenna occupies a volume of 50 × 37.5 ×1.6 mm 3 , and is printed on an FR4 substrate. Initially, the frequency tunability of the MIMO antennas was verified by lumped capacitors with values between 0.75 to 2.75 pF to achieve a tuning range from 1.55 to 2.07GHz while the low mutual coupling between the radiators was accomplished by adding an I-shaped branch to a cut-away ground plane. The two antennas are then loaded with varactors to simultaneously achieve miniaturization and tunability. Simulation and measurement results demonstrate the successful implementation of a tunable MIMO with coupling reduction mechanism for a portable handheld wireless transceiver. The channel capacity of the proposed antenna is investigated and found to be close to that of an uncorrelated system with efficient diversity in which the mutual coupling across the full bandwidth was better than -13dB. Owing to the compact size and ease of manufacture, the proposed antennas can be a promising solution for adaptive MIMO systems in handheld devices.

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“…One can also see that moderate mutual couplings 5 (e.g., ρ = 0.2) do not have noticeable effect on system performance. As shown in [28], the value of ρ for practical half-wave dipole antennas is in the range of 0.2 and 0.3 for the antenna separation of half a wavelength. Therefore mutual coupling does not impose a big concern for the application of the proposed OFDM-PPC scheme to practical systems.…”

Section: Multiple Receivers With Mutual Couplingmentioning

confidence: 99%

Passive Phase Conjugation Applied to an OFDM-Based Terrestrial Communication System

Xiao

Fusco

2012

IEEE Trans. Veh. Technol.

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Abstract-The demand for high data rate radio systems that can operate robustly in multipath environments presents challenging technical issues. In this paper, we propose a Passive Phase Conjugation (PPC) based Orthogonal Frequency Division Multiplexing (OFDM) system. Compared to the conventional OFDM system, the proposed system achieves a lower computational complexity since the need for conventional channel estimation and equalisation can be eliminated. The performance gain of the proposed technique is shown to be particularly advantageous in systems with multiple receiver array elements. Numerical results are provided in order to illustrate the performance of the system when operating through a multipath radio channel. We also derive a closed form formula which can be used to predict the performance of the proposed scheme over multipath channels with uniform power delay profile. Our analysis validates the simulation results and provides insights into the behavior of wireless centric OFDM-PPC systems.

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Signal correlation including antenna coupling

Cited by 40 publications

References 5 publications

Estimating Combined Correlation Functions for Dipoles in Rayleigh-Fading Scenarios

Estimating Combined Correlation Functions for Dipoles in Rayleigh-Fading Scenarios

Compact and closely spaced tunable printed F‐slot multiple‐input–multiple‐output antenna system for portable wireless applications with efficient diversity

Passive Phase Conjugation Applied to an OFDM-Based Terrestrial Communication System

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