Beamforming via Large and Dense Antenna Arrays Above a Clutter

Alrabadi, Osama N.; Tsakalaki, Elpiniki; Huang, Haiyang; Pedersen, Gert Frølund

doi:10.1109/jsac.2013.130218

Cited by 54 publications

(26 citation statements)

References 26 publications

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“…The computational complexity of the proposed approach and of the existing GMUSIC method will be analyzed in more detail in the next section. 4 The dimensions of a 1 ðθ;φ k Þ here are P 0 and 3, while the dimensions of a 1 ðθ;φ k Þ in [34] are M and 3, and M⪢P 0 .…”

Section: Algorithm 1 Estimating the Nominal Doas And The Angular Sprmentioning

confidence: 99%

“…In massive MIMO systems, the base station (BS) is equipped with a hundred or a few hundred antennas, serving tens of user terminals (UTs) simultaneously. However, the performance of these systems degrades when the angular spreads are not wide enough, hence a beamforming approach is proposed to achieve directional antenna gain [4]. Meanwhile, the large number of antennas have become feasible due to the employment of multidimensional antenna arrays, such as uniform rectangular array (URA) and uniform cylindrical array (UCyA).…”

Section: Introductionmentioning

confidence: 99%

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A beamspace approach for 2-D localization of incoherently distributed sources in massive MIMO systems

Tan

Gao

et al. 2016

Signal Processing

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Large scale/massive multiple-input multiple-output systems (LS-MIMO/massive MIMO) Multiple-input multiple-output (MIMO) Uniform cylindrical array (UCyA) a b s t r a c tIn this paper, a generalized low-complexity beamspace approach is proposed for twodimensional localization of incoherently distributed sources with a uniform cylindrical array (UCyA) in large scale/massive multiple-input multiple-output (MIMO) systems. The received signal vectors in the antenna-element space are transformed into the beamspace by employing beamforming vectors. As a beneficial result, the total dimensions of the received signal vectors are significantly reduced. In addition, it is shown that the error introduced by the transformation decreases as the number of UCyA antennas increases. The UCyA is composed of multiple uniform circular arrays (UCAs), and the beamspace array response matrices of adjacent UCAs are linearly related. Then, the linear relation is exploited to estimate the nominal elevation direction-of-arrivals (DOAs) directly and the nominal azimuth DOAs based on a lowcomplexity search algorithm. In contrast, the linear relation in the traditional approach is based on approximations and the associated search algorithm is more complicated. Numerical results demonstrate that the proposed approach outperforms the existing approach in terms of both performance and complexity in the context of massive MIMO systems.

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Section: Algorithm 1 Estimating the Nominal Doas And The Angular Sprmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A beamspace approach for 2-D localization of incoherently distributed sources in massive MIMO systems

Tan

Gao

et al. 2016

Signal Processing

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“…Taking into account imperfect channel estimation, pilot contamination, path loss and arbitrary antenna correlation for each link, the authors of [7] have provided a unified performance analysis for both uplink and downlink of non-cooperative multi-cell TDD systems. In [8], the authors have studied the beamforming (BF) performance of large and dense antenna arrays with arbitrarily many elements.…”

Section: Introductionmentioning

confidence: 99%

“…Examples include zero-forcing (ZF) [5], [6], maximum ratio combining (MRC) [5], [6], eigen-beamforming [7], [8], Hermitian precoding [9], joint BS clustering and linear BF [10]. Meanwhile, although robust BF design for BS equipped with a relatively small number of antennas has been an active research topic in wireless communications for many years, and many effective algorithms, such as worst-case approaches [11], [12] and stochastic approaches [13]- [15], have been proposed, the investigation of robust BF in multi-user LS-MIMO systems is still an open yet very interesting topic.…”

Section: Introductionmentioning

confidence: 99%

Robust BF in large-scale antenna systems with imperfect channel state information

Lin

Ouyang

Zhu

et al. 2014

2014 IEEE International Conference on Communications (ICC)

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This paper addresses robust beamforming (BF) design for the uplink transmission of wireless networks, where the base station (BS) equipped with a very large number of antennas communicates with multiple users on the same frequency band simultaneously. Based on the assumption that the wireless channels undergo correlated Rayleigh fading, we first formulate an optimization problem to maximize the output signal-tointerference-plus-noise ratio (SINR) of the intended users. Then, by using the fact that channel uncertainty is norm-bounded and imperfect channel state information (CSI) is available at the BS, we transform the optimization problem to a support vector machine (SVM) regression one, and obtain the robust solution for the BF weight vectors by means of quadratic programming (QP) technique or iterative reweighted least squares (IRWLS) procedure. The computational cost of the proposed robust BF scheme depends on the number of channel vector samples rather than that of the antennas, thus it is suitable for the wireless systems with large-scale antennas. Finally, the efficiency and superiority of the proposed new scheme are confirmed through computer simulation.

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“…Both single and multi-beam beamforming modes were analyzed in [23], where the optimal number of beams was calculated under the intention of maximizing the users' sumrate by reducing the IBA. Both optimal singleand multi-beam TBF were proposed in [24] under per-antenna power constraints.…”

mentioning

confidence: 99%

Adaptive antenna-activation based beamforming for large-scale MIMO communication systems of high speed railway

2016

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12high-reliability and high-rate services for high speed railway (HSR) passengers has drawn increasing research interests in recent years [1]-[12]. This system faces several challenges imposed by a high Doppler shift, by the estimation of rapidly time-varying channels and frequent handovers. Nevertheless, it also enjoys inherent advantages, such as a predictable vehicle speed and the location information provided by the dedicated communication based train control (CBTC) subsystem [13].Several spatial multiplexing, diversity and beamforming based schemes have been conceived for small-scale multiple-antenna aided POCS systems of HSR [9]- [12]. To be more specific, an efficient handover scheme was proposed in [10] for exploiting the benefits of beamforming and of the positioning information. In [11], a location-information assisted opportunistic beamforming scheme was proposed for the multi-user long-term-evolution (LTE) system employed in HSR. The beamforming technique was also combined with space-time block coding for the case of achieving diversity gain in POCSs [12]. As pointed out in [9], due to the rapidly varying DOA caused by high mobility, it is impractical to mechanically steer a pencil beam for tracking the antenna on the train. From the Abstract: Large-scale array aided beamforming improves the spectral efficiency (SE) as a benefit of high angular resolution. When dual-beam downlink beamforming is applied to the train moving towards cell edge, the inter-beam ambiguity (IBA) increases as the directional difference between beams becomes smaller. An adaptive antenna activation based beamforming scheme was proposed to mitigate IBA. In the district near the base station (BS), all antenna elements (AEs) were activated to generate two beams. As the distance from the train to the BS increased, only the minimum number of AEs satisfying the resolution criterion would be activated. At the cell edge, one beam was switched off due to intolerable IBA. The proposed scheme can achieve SE gain to the non-adaptive scheme and show more robustness against the direction-of-arrival (DOA) estimation error.

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Beamforming via Large and Dense Antenna Arrays Above a Clutter

Cited by 54 publications

References 26 publications

A beamspace approach for 2-D localization of incoherently distributed sources in massive MIMO systems

A beamspace approach for 2-D localization of incoherently distributed sources in massive MIMO systems

Robust BF in large-scale antenna systems with imperfect channel state information

Adaptive antenna-activation based beamforming for large-scale MIMO communication systems of high speed railway

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