A Robust Secure Hybrid Analog and Digital Receive Beamforming Scheme for Efficient Interference Reduction

Sun, Lei; Qin, Yaolu; Feng, Songlin; Chen, Riqing; Zhang, Yijin; Yang, Sheng; Lü, Jian; Li, Jun; Wang, Jiangzhou

doi:10.48550/arxiv.1801.06776

Cited by 1 publication

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“…where θ is the actual AoA/AoD and θ is the estimated AoA/AoD. Following [25], [27], the beam alignment error δ is characterized by a random variable following a uniform distribution, given by…”

Section: Error Model For Beam Misalignmentmentioning

confidence: 99%

“…While there are already works that investigate the performance loss of beam misalignment, there are only a limited number of studies that consider the robust hybrid precoding design in the presence of beam misalignment [9], [25]. In [9], the authors consider the beam misalignment for backhaul links in small-cell scenarios, and propose a beam alignment method based on adaptive subspace sampling and hierarchical beam codebooks.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, the frequent beam re-alignment for a large-scale antenna array may not be favorable for delay-sensitive applications in mmWave communications. In [25], a hybrid precoding scheme is proposed to resist the AoA estimation errors based on the null-space projection in the analog domain and diagonal-loading method in the digital domain, respectively. However, this scheme is only applicable to a single-user mmWave communication system with the partially-connected structure, where each RF chain is connected to a subset of antennas.…”

Section: Introductionmentioning

confidence: 99%

“…While there has been a previous attempt to synthesize a realistic 'flat mainlobe' beampattern in [26], it considers only a single-receiver analog beamforming and the relaxation of its optimization problem does not guarantee element-wise constant modulus for the analog precoder, which is required for mmWave transceivers that employ phase shifters. In addition, the statistics of the AoD/AoA estimation errors has been studied in [24] and [27], and it is shown in [25] that the inclusion of the 'error statistics' into the precoding design can also lead to an improved performance for the case of beam misalignment. However, the above two concepts have not been well explored for robust multi-receiver hybrid precoding design in mmWave communications.…”

Section: Introductionmentioning

confidence: 99%

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Robust Hybrid Precoding for Beam Misalignment in Millimeter-Wave Communications

Pradhan,

Li,

Zhuo

et al. 2019

Preprint

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In this paper, we focus on the phenomenon of beam misalignment in Millimeter-wave (mmWave) multi-receiver communication systems, and propose robust hybrid precoding designs that alleviate the performance loss caused by this effect. We consider two distinct design methodologies: I) the synthesis of a 'flat mainlobe' beam model which maximizes the minimum effective array gain over the beam misalignment range, and II) the inclusion of the 'error statistics' into the design, where the array response incorporating the distribution of the misalignment error is derived. For both design methodologies, we propose a hybrid precoding design that approximates the robust fully-digital precoder, which is obtained via alternating optimization based on the gradient projection (GP) method. We also propose a low-complexity alternative to the GP algorithm based on the least square projection (LSP), and we further deploy a second-stage digital precoder to mitigate any residual inter-receiver interference after the hybrid analog-digital precoding. Numerical results show that the robust hybrid precoding designs can effectively alleviate the performance degradation incurred by beam misalignment.

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Section: Error Model For Beam Misalignmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Robust Hybrid Precoding for Beam Misalignment in Millimeter-Wave Communications

Pradhan,

Li,

Zhuo

et al. 2019

Preprint

View full text Add to dashboard Cite

show abstract

A Robust Secure Hybrid Analog and Digital Receive Beamforming Scheme for Efficient Interference Reduction

Cited by 1 publication

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Robust Hybrid Precoding for Beam Misalignment in Millimeter-Wave Communications

Robust Hybrid Precoding for Beam Misalignment in Millimeter-Wave Communications

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