Decontaminating pilots in massive MIMO systems

Yin, Haifan; Gesbert, David; Filippou, Miltiades C.; Liu, Yingzhuang

doi:10.1109/icc.2013.6655031

Cited by 61 publications

(40 citation statements)

References 14 publications

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“…It is the reason that pilot contamination can be suppressed in the CS-PA scheme. Since the factors that affect the performance of TSP scheme in (9) are not introduced in the CS-PA scheme, it can be also observed that the performance of the CS-PA scheme is improved compared with TSP scheme. Therefore, the achieved rates of the CS-PA scheme is higher than the conventional synchronized pilot scheme and the TSP scheme.…”

Section: Performance Analysismentioning

confidence: 99%

“…However, these blind algorithms are only employed in slowly varying channel scenarios and impaired by scalar ambiguity. [8,9] enable cell coordination with a certain class of channel statistical information to distinguish the interfering users. Although these algorithms can suppress pilot contamination, they utilize complex coordination among BSs with additional channel statistics.…”

Section: Introductionmentioning

confidence: 99%

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Cell sectorization-based pilot assignment scheme in massive MIMO systems

Zhao

Chen

Liu

2015

2015 Wireless Telecommunications Symposium (WTS)

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Pilot contamination has become a major capacity bottleneck in massive MIMO systems. To mitigate pilot contamination, a novel cell sectorization-based pilot assignment (CS-PA) scheme is proposed in this paper. By separating the users that transmit the same pilot in physical space, the pilot transmitted by the user in each sector is orthogonal with pilots transmitted by the users in adjacent sectors. Due to the advantages of cell sectorization and pilot assignment, the proposed CS-PA scheme can effectively suppress pilot contamination. In addition, the proposed CS-PA scheme achieves higher system throughput as the number of base station antennas tends to infinity. The closedform expression for the achieved rates is derived to verify the advantages of the proposed scheme. Numerical results show that the proposed CS-PA scheme significantly outperforms the typical pilot contamination mitigation methods.

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Section: Performance Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cell sectorization-based pilot assignment scheme in massive MIMO systems

Zhao

Chen

Liu

2015

2015 Wireless Telecommunications Symposium (WTS)

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“…Therefore, this approach is quite supportive to the objective in original optimization problem (5). Above decontamination algorithms in (11), (13) and (15) need exhaustive search to obtain the optimal pilot allocation. However, as the number of users in the network increases, it requires lots of computational time.…”

Section: Hybrid Decontaminationmentioning

confidence: 99%

“…They proposed a channel predicting approach by utilizing the properties of random matrix theory. In [13], spatial correlation properties are utilized for reusing the pilot resources among users with sufficient angular separation. Achievable rates in a contaminated multiuser MIMO system is analyzed for massive MIMO [14] and for precoding based on MMSE [15] is analyzed by using of large scale fading.…”

Section: Introductionmentioning

confidence: 99%

Traffic aware pilot de-contamination for multi-cell MIMO systems

Jayasinghe

Tölli

Kaleva

et al. 2017

2017 European Conference on Networks and Communications (EuCNC)

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Abstract-Traffic aware precoder/decoder design in multi-cell multi-user multiple-input multiple-output systems is considered with the objective of weighted queue minimization, where the original non-convex optimization problem is solved via successive convex approximation. Centralized pilot reuse algorithms for mitigating the pilot contamination are investigated to reflect the traffic aware optimization objective. Distinctive feature of the proposed pilot reuse algorithms is to utilize the user buffer state information jointly with the traditional large scale fading values when allocating the limited pilot resources among the served users. Numerical examples compare the performance of the proposed pilot reuse algorithms for varying number of available pilots and different traffic arrival models. The results demonstrate that significant performance gains are available when the pilot allocation strategy is designed to reflect closely the overall system optimization objective.

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“…In [33], [73], a Bayesian channel estimator is first developed for the UL channel in the multi-cell scenario. Then, it is shown that pilot contamination is commensurately reduced, when using more antennas at the eNB, provided that the covariances of the desired signal and interference span different subspaces.…”

Section: B Performance Of Precoders/detectors In Multi-cell Environmmentioning

confidence: 99%

Survey of Large-Scale MIMO Systems

Zheng

Zhao

Mei

et al. 2015

IEEE Commun. Surv. Tutorials

277

168

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Abstract-The escalating teletraffic growth imposed by the proliferation of smartphones and tablet computers outstrips the capacity increase of wireless communications networks. Furthermore, it results in substantially increased carbon dioxide emissions. As a powerful countermeasure, in the case of full-rank channel matrices, MIMO techniques are potentially capable of linearly increasing the capacity or decreasing the transmit power upon commensurately increasing the number of antennas. Hence, the recent concept of large-scale MIMO (LS-MIMO) systems has attracted substantial research attention and been regarded as a promising technique for next-generation wireless communications networks. Therefore, this paper surveys the state of the art of LS-MIMO systems. First, we discuss the measurement and modeling of LS-MIMO channels. Then, some typical application scenarios are classified and analyzed. Key techniques of both the physical and network layers are also detailed. Finally, we conclude with a range of challenges and future research topics.Index Terms-Large-scale MIMO, 3-D MIMO, channel modeling, physical layer, networking.

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Decontaminating pilots in massive MIMO systems

Cited by 61 publications

References 14 publications

Cell sectorization-based pilot assignment scheme in massive MIMO systems

Cell sectorization-based pilot assignment scheme in massive MIMO systems

Traffic aware pilot de-contamination for multi-cell MIMO systems

Survey of Large-Scale MIMO Systems

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