Smart geometrical antenna design exploiting the LOS component to enhance a MIMO system based on rayleigh-fading in indoor scenarios

Haustein, Thomas; Kruger, U.

doi:10.1109/pimrc.2003.1260290

Cited by 49 publications

(19 citation statements)

References 11 publications

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“…In [4] the possibility of enhancing performance by considering the array geometry when a strong line-of-sight (LOS) component is present is discussed. Further, expressions for reasonable placement of the antennas in parallel uniform linear arrays (ULAs) are introduced in [5] and [6], while some numerical investigations are presented in [7] and [8].…”

Section: Introductionmentioning

confidence: 99%

Design of Optimal High-Rank Line-of-Sight MIMO Channels

Bohagen

Orten

Oien

2007

IEEE Trans. Wireless Commun.

286

183

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This paper describes a technique for realizing a high-rank channel matrix in a line-of-sight (LOS) multiple-input multiple-output (MIMO) transmission scenario. This is beneficial for systems which are unable to make use of the originally derived MIMO gain given by independent and identically distributed (i.i.d.) flat Rayleigh fading subchannels. The technique is based on optimization of antenna placement in uniform linear arrays with respect to mutual information (MI). By introducing a new and more general 3-D geometrical model than that applied in earlier work, additional insight into the optimal design parameters is gained. We also perform a novel analysis of the sensitivity of the optimal design parameters, and derive analytical expressions for the eigenvalues of the pure LOS channel matrix which are valid also when allowing for non-optimal design. Furthermore, we investigate the approximations introduced in the derivations, in order to reveal when the results are applicable. The LOS matrix is employed in a Ricean fading channel model, and performance is evaluated with respect to the average MI and the MI cumulative distribution function. Our results show that even with some deviation from the optimal design, the LOS MIMO case outperforms the i.i.d. Rayleigh case in terms of MI.

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Section: Introductionmentioning

confidence: 99%

Design of Optimal High-Rank Line-of-Sight MIMO Channels

Bohagen

Orten

Oien

2007

IEEE Trans. Wireless Commun.

286

183

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“…As indicated by [4], [7], [8], and [14], the optimal antenna arrangements are mainly influenced by the carrier wavelength λ, the number of antenna elements N , and the transmit distance D. With high carrier frequency and short distance, the optimal design has the potential for developing ultra-high speed board-to-board communication systems with reasonable antenna sizes. For the parallel uniform linear array (ULA) with N antennas, the optimal antenna spacings d t and d r between antennas at transmitter and receiver side given in [7], [8] satisfy…”

Section: Optimal Los Mimo Array Designmentioning

confidence: 99%

“…For the parallel uniform linear array (ULA) with N antennas, the optimal antenna spacings d t and d r between antennas at transmitter and receiver side given in [7], [8] satisfy…”

Section: Optimal Los Mimo Array Designmentioning

confidence: 99%

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Strong LOS MIMO for Short Range mmWave Communication - Towards 1 Tbps Wireless Data Bus

Song

Landau

Fettweis

2015

2015 IEEE International Conference on Ubiquitous Wireless Broadband (ICUWB)

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In this paper, we propose a wireless data bus system design which relies on a strong Line-of-Sight MIMO approach. An analog MIMO equalizer, which equalizes the deterministic MIMO channel is involved. Instead of interference suppression, the analog MIMO equalizer aligns the phases of the received signals and enhances the desired signal while it suppresses the undesired ones simultaneously. Although the magnitudes of different signal components of the received signals are preferred to be unique, further studies are applied in our work to investigate the validation of our system design with non-unique magnitudes by using practical on-board antennas. It is shown that the proposed system works well with non-unique magnitudes where undesired remaining interference occurs with limited power in comparison with the desired ones. Furthermore, the proposed design shows a great potential for putting a 1 Tbps wireless data bus into practical systems with moderate transmit power and fairly simple modulation schemes which provide high energy efficiency.

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“…However, "correlation" cannot properly be applied to these channels since they are increasingly deterministic as the Rician K-factor increases, with channel gains based almost solely on the physical configuration of the link. Although low capacities are common in LOS, a substantial body of research concludes that certain configurations can achieve the maximum capacity [1][2][3][4][5][6][7] by ensuring the channel matrix is full rank. One result is the derivation of an optimal inter-element antenna spacing [3][4][5] for a given link's range and frequency.…”

Section: Introductionmentioning

confidence: 99%

Repeater-Assisted Capacity Enhancement (RACE) for MIMO Links in a Line-of-Sight Environment

Walkenhorst

Ingram

2009

2009 IEEE International Conference on Communications

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A single on-frequency, full duplex wireless repeater is considered for enhancing the capacity of a long-distance 2x2 multiple-input multiple-output (MIMO) wireless link with a dominant line-of-sight (LOS) component. Such links might be used for high-speed communication between buildings or towers. For practical reasons, the aperture sizes of the transmit (TX) and receive (RX) arrays may be limited, which tends to make the rank of the long-distance MIMO channel matrix close to unity. The paper shows that the addition of just one repeater can bring the channel to full rank, approximately doubling the capacity of the link. Typical values of repeater isolation are assumed. For small TX and RX array element spacings, there is considerable robustness in optimal repeater location. Even with some multipath, most of the capacity improvement is retained.This full text paper was peer reviewed at the direction of IEEE Communications Society subject matter experts for publication in the IEEE ICC 2009 proceedings 978-1-4244-3435-0/09/$25.00 ©2009 IEEE

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Smart geometrical antenna design exploiting the LOS component to enhance a MIMO system based on rayleigh-fading in indoor scenarios

Cited by 49 publications

References 11 publications

Design of Optimal High-Rank Line-of-Sight MIMO Channels

Design of Optimal High-Rank Line-of-Sight MIMO Channels

Strong LOS MIMO for Short Range mmWave Communication - Towards 1 Tbps Wireless Data Bus

Repeater-Assisted Capacity Enhancement (RACE) for MIMO Links in a Line-of-Sight Environment

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