Signal correlations in coupled cell and MIMO antennas

Leifer, Mark C.

doi:10.1109/aps.2002.1018188

Cited by 13 publications

(4 citation statements)

References 2 publications

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“…Other studies have noted the reduced correlation associated with termination [3], [6]- [12], but have not provided a framework for arriving at this perfectly diagonal covariance. It is important to realize that this decorrelation is simply the result of recombination of the received signals, and therefore does not necessarily enhance the diversity performance of the system.…”

Section: Optimal Hermitian Matchmentioning

confidence: 94%

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Termination-Dependent Diversity Performance of Coupled Antennas: Network Theory Analysis

Wallace

Jensen

2004

IEEE Trans. Antennas Propagat.

130

109

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A new analysis of mutually coupled diversity antenna systems is presented that includes the effects of coupling on the radiation pattern and received power. This analysis, based upon the network scattering parameters, makes use of the singular value decomposition to both specify the characteristics of and analyze terminated antenna networks. The approach facilitates a simplified proof of the multiport conjugate matching condition as well as development of expressions for diversity performance as a function of various impedance terminations. Application of the analysis to coupled dipole antennas characterized using full-wave electromagnetic analysis leads to a comprehensive examination of the diversity performance obtainable for such antennas under different termination conditions. The results from this paper reveal that for closely spaced antennas, the termination can play a noticeable role in determining the diversity gain offered by coupled antennas.

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Section: Optimal Hermitian Matchmentioning

confidence: 94%

“…To demonstrate the bilateral conjugate match condition, we first set in (4) and subsequently use (6). Then, assuming that is full-rank (invertible) and applying the lossless conditions in (10) leads to the simplified expression 17Obviously, is a (unique) solution to this equation.…”

Section: Bilateral Hermitian Matchmentioning

confidence: 99%

Termination-Dependent Diversity Performance of Coupled Antennas: Network Theory Analysis

Wallace

Jensen

2004

IEEE Trans. Antennas Propagat.

130

109

View full text Add to dashboard Cite

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“…Klemp (klemp@hft.uni-hannover.de) sideration. Based upon a suitable statistical model to include for the spatial properties of a multipath propagation scenario as given in Jakes (1974), a closed form representation for antenna correlation may be derived as shown in Leifer (2002) and . This representation of antenna correlation may be directly related to the computation of MIMO channel capacity as for the description of MIMO communication systems employing a certain number of antenna elements at the transmitter and at the receiver.…”

Section: Introductionmentioning

confidence: 99%

Computation of antenna pattern correlation and MIMO performance by means of surface current distribution and\\ spherical wave theory

2006

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Abstract. In order to satisfy the stringent demand for an accurate prediction of MIMO channel capacity and diversity performance in wireless communications, more effective and suitable models that account for real antenna radiation behavior have to be taken into account. One of the main challenges is the accurate modeling of antenna correlation that is directly related to the amount of channel capacity or diversity gain which might be achieved in multi element antenna configurations. Therefore spherical wave theory in electromagnetics is a well known technique to express antenna far fields by means of a compact field expansion with a reduced number of unknowns that was recently applied to derive an analytical approach in the computation of antenna pattern correlation. In this paper we present a novel and efficient computational technique to determine antenna pattern correlation based on the evaluation of the surface current distribution by means of a spherical mode expansion.

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“…These studies are performed in two categories: one considers the mutual impedance, mutual coupling or scattering parameters of the antennas [5][6][7][8] and the others insist on the effect of coupling on the antenna radiation pattern and the resulting correlation between the received signals [9][10][11][12][13][14]. The available analytical models based upon the mutual impedance provide an approximation of the diversity performance.…”

Section: Introductionmentioning

confidence: 99%

Diversity Techniques With Parallel Dipole Antennas: Radiation Pattern Analysis

Khaleghi¹

2006

PIER

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Abstract-Two parallel dipoles are assessed for antenna diversity. The three-dimensional radiation pattern is considered for signals correlation coefficient. The pattern analysis reveals that, depending on dipole spacing, three types of diversity techniques are generated: space, amplitude-pattern and phase-pattern diversity. The weighting of each technique in signals correlation coefficient mitigation is investigated. The results show that for closely spaced dipoles, the generated phasepattern diversity is the most dominant factor which greatly reduces the signals correlation coefficient.The diversity configuration is measured in a rich scattering environment. Results include signals correlation coefficient, diversity gain for selection combining and maximum ratio combining, effective diversity gain and antenna radiation efficiency can be demonstrated. We show that in rich multipath channel the minimum spatial distance, for effective diversity gain performance, is reduced from 0.5λ for uncoupled dipoles to 0.15λ for coupled dipoles.

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Signal correlations in coupled cell and MIMO antennas

Cited by 13 publications

References 2 publications

Termination-Dependent Diversity Performance of Coupled Antennas: Network Theory Analysis

Termination-Dependent Diversity Performance of Coupled Antennas: Network Theory Analysis

Computation of antenna pattern correlation and MIMO performance by means of surface current distribution and\\ spherical wave theory

Diversity Techniques With Parallel Dipole Antennas: Radiation Pattern Analysis

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