Distributed versus centralized antenna arrays in broadband wireless networks

Clark, M.V.; Willis, T.M.; Greenstein, L.J.; Rustako, A.J.; Erceg, V.; Román, Rodrigo

doi:10.1109/vetecs.2001.944798

Cited by 123 publications

(61 citation statements)

References 4 publications

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“…An alternative strategy is to try to reduce the overall transmit power (and hence othercell interference) using distributed antennas, which has the additional merit of providing better coverage and increasing battery life [2]. Although distributed antennas systems (DAS) were originally introduced to simply cover the dead spots in indoor wireless communications [3], recent studies have identified other potential advantages such as reduced power and increased system capacity [4]- [9].…”

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confidence: 99%

Downlink performance and capacity of distributed antenna systems in a multicell environment

Choi

Andrews

2007

IEEE Trans. Wireless Commun.

566

429

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Abstract-Distributed antenna systems (DAS) have been widely implemented in state-of-the art cellular communication systems to cover dead spots. Recent academic studies have shown that in addition to coverage improvements, DAS can also have potential advantages such as reduced power and increased system capacity in a single cell environment. This paper analytically quantifies downlink capacity of multicell DAS for two different transmission strategies: selection diversity (where just one or two of the distributed antennas are used) and blanket transmission (where all antennas in the cell broadcast data). Simple repeaters are a special case of our analysis. A generalized information theoretic analysis is provided to illuminate the fundamental limits of such systems in the cellular context. The results show that DAS reduces other-cell interference in a multicell environment and hence significantly improves capacity (by about 2x), with particularly large improvements for users near cell boundaries. Less obviously, from a communication theory standpoint, it is shown that selection diversity is preferable to blanket transmission in terms of achievable ergodic capacity. For blanket transmission, we show that the optimal transmission strategy is just phase steering due to the per antenna module power constraints in DAS.

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mentioning

confidence: 99%

Downlink performance and capacity of distributed antenna systems in a multicell environment

Choi

Andrews

2007

IEEE Trans. Wireless Commun.

566

429

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“…It has recently been shown that the distributed antenna system (DAS) outperforms traditional co-located antenna systems (CASs) in terms of not only transmit power saving but also spectral efficiency for various cellular radio environments (e.g., [1][2][3][4]). Therefore, the DAS is considered a new cellular communication structure for future wireless communication networks [3].…”

Section: Introductionmentioning

confidence: 99%

Composite vector quantization for optimizing antenna locations

Uykan

Jäntti²

2018

Turk J Elec Eng & Comp Sci

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Abstract:In this paper, we study the location optimization problem of remote antenna units (RAUs) in generalized distributed antenna systems (GDASs). We propose a composite vector quantization (CVQ) algorithm that consists of unsupervised and supervised terms for RAU location optimization. We show that the CVQ can be used i) to minimize an upper bound to the cell-averaged SNR error for a desired/demanded location-specific SNR function, and ii) to maximize the cell-averaged effective SNR. The CVQ-DAS includes the standard VQ, and thus the well-known squared distance criterion (SDC) as a special case. Computer simulations confirm the findings and suggest that the proposed CVQ-DAS outperforms the SDC in terms of cell-averaged "effective SNR".

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“…Although most massive MIMO concepts are discussed for use in a centralized antenna system (CAS) where antennas of a base station are located at the center of the cell, the concept is theoretically applicable to a distributed antenna system (DAS) [8]- [10] as well. The DAS is known to improve the cell-edge throughput performance.…”

Section: Introductionmentioning

confidence: 99%

A Throughput Evaluation of an Over-Distributed Antenna System with Limited Pilot Resources

Nakanishi¹,

Nishimura²,

Ohgane³

et al. 2015

IEICE Trans. Commun.

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SUMMARY A distributed antenna system, where the antennas of a base station are spatially distributed throughout the cell, can achieve better throughput at the cell edge than a centralized antenna system. On the other hand, the peak throughput degrades in general because each remote antenna unit has only a few antennas. To achieve both high peak and cell-edge throughputs, we need to increase the total number of antennas. However, this is not easy due to the pilot resource limitation when we use frequency division duplexing. In this paper, we propose using more antennas than pilot resources. The number mismatch between antennas and signals is solved by using a connection matrix. Here, we test two types of connection matrix: signal-distributing and signal-switching. Simulation results show that the sum throughput is improved by increasing the number of antenna elements per remote antenna unit under a constraint on the same number of pilot resources.

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Distributed versus centralized antenna arrays in broadband wireless networks

Cited by 123 publications

References 4 publications

Downlink performance and capacity of distributed antenna systems in a multicell environment

Downlink performance and capacity of distributed antenna systems in a multicell environment

Composite vector quantization for optimizing antenna locations

A Throughput Evaluation of an Over-Distributed Antenna System with Limited Pilot Resources

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