Capacity of MIMO systems with closely spaced antennas

Jungnickel, Volker; Pohl, Volker; Helmolt, C. von

doi:10.1109/lcomm.2003.815644

Cited by 94 publications

(41 citation statements)

References 6 publications

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“…The work [28] finds that for the spacings between 0.1λ and 0.3λ, mutual coupling provides a clear capacity benefit, while for the spacings below 0.1λ, mutual coupling degrades the capacity, compared to the array spacing of 0.5λ. The studies [29], [30] conclude that the capacity for spacings between 0.2λ ≤ D < 0.5λ is larger than that of D ≥ 0.5λ. For two-dimensional antenna arrays, the results of this paper have convincingly demonstrated that our NURA achieves a significant higher capacity than the standard URA having the same size, albeit the capacity expressions for both the URA and NURA are based on clean steering vectors.…”

Section: Further Discussionmentioning

confidence: 99%

Structured Non-Uniformly Spaced Rectangular Antenna Array Design for FD-MIMO Systems

Liu

Hanzo

Sun

et al. 2017

IEEE Trans. Wireless Commun.

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Abstract-Full-dimensional multiple-input multiple-output (FD-MIMO) systems, whereby each base station is equipped with a uniformly spaced rectangular antenna array (URA), provides a practical means of realizing massive multiple-input multiple-output systems. However, the spectral efficiency of URA is considerably lower than that of its uniformly spaced linear array counterpart having the same number of antenna elements. In this paper, we first introduce a discrete angular resolution metric for quantifying the low resolution of URA in the antenna-elevation domain. This motivates us to propose a novel antenna device design, referred to as the structured non-uniformly spaced rectangular array (NURA), in which the antenna elements are non-uniformly distributed in the elevationangle domain. Specifically, we conceive a structured NURA device for which the nonuniform distribution of the elevationdomain antenna elements is controlled by a single parameter. The design of the optimally structured NURA for the given nonlinear antenna-element-positioning function then becomes a single-parameter optimization, namely that of maximizing the spectral efficiency of the FD-MIMO system, which can be solved efficiently. Our simulation results demonstrate that our structured NURA design significantly outperforms the standard URA in terms of achievable spectral efficiency. Our proposed structured NURA design therefore offers an effective practical framework for enhancing the achievable performance of FD-MIMO systems.

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Section: Further Discussionmentioning

confidence: 99%

Structured Non-Uniformly Spaced Rectangular Antenna Array Design for FD-MIMO Systems

Liu

Hanzo

Sun

et al. 2017

IEEE Trans. Wireless Commun.

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“…Therefore closely spaced antennas correlate the channel fading. As a result the capacity is reduced when the antenna spacing d is less than l/2, where l is the carrier wavelength [12]. Mutual coupling between closely spaced antenna elements is also a potential problem.…”

Section: Introductionmentioning

confidence: 99%

Spatial data stream multiplexing scheme for high-throughput WLANs

Gravalos

Hadjinicolaou

et al. 2008

IET Commun.

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A novel scheme using spatial data stream multiplexing (SDSM) in the upcoming multiple-input multipleoutput (MIMO)-based IEEE 802.11n physical layer is proposed. It is shown that with SDSM, the same data rate can be achieved by using less number of transmit and receive antennas and therefore this scheme can reduce the number of antennas which results in reducing mutual coupling effects, hardware costs and implementation complexities. The maximum data rates that can be achieved using a 2 Â 2 MIMO system is 270 Mbps and for a 4 Â 4 MIMO system is 540 Mbps. The same data rates can be achieved using the SDSM technique which reduces the 2 Â 2 MIMO system to 1 Â 1 SISO system and the 4 Â 4 MIMO system to a 2 Â 2 MIMO system.

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“…a range of antenna separations) [8], [9]. Some related works, such as [10], [11] and [12], study the impact of mutual coupling on capacity without making direct comparisons with the no-coupling case.…”

mentioning

confidence: 99%

Capacity Analysis for Compact MIMO Systems

Lau

Kristensson

et al.

2005 IEEE 61st Vehicular Technology Conference

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Abstract-We analyze the impact of mutual coupling on the capacity of MIMO systems with compact antenna arrays. Existing studies present conflicting views on the effect of mutual coupling. This is, in part, due to their different scopes and underlying assumptions of the system setups. In this paper, we aim to give a comprehensive picture by first examining the impact of mutual coupling on three capacity-related performance measures: antenna correlation, efficiency and bandwidth. While the first two aspects have received significant attention, antenna bandwidth with mutual coupling is a relatively uncharted territory. We show that while implementing a good matching network can drastically improve the system capacity for narrowband systems in the presence of strong mutual coupling, the same conclusions may not necessarily apply to wideband cases. To exemplify this, we carry out capacity simulations for an end-to-end MIMO system, where a recently proposed S-parameter approach is used in conjunction with the 3GPP-3GPP2 channel model to model realistic wideband channel and antenna effects at both transmit and receive ends.

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Capacity of MIMO systems with closely spaced antennas

Cited by 94 publications

References 6 publications

Structured Non-Uniformly Spaced Rectangular Antenna Array Design for FD-MIMO Systems

Structured Non-Uniformly Spaced Rectangular Antenna Array Design for FD-MIMO Systems

Spatial data stream multiplexing scheme for high-throughput WLANs

Capacity Analysis for Compact MIMO Systems

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