255,455 research outputs found
Performance Evaluation of Distributed-Antenna Communications Systems Using Beam-Hopping
No full textDigital beamforming (DBF) techniques are capable of improving the performance of communications systems significantly. However, if the transmitted signals are conflicted with strong interference, especially, in the direction of the transmitted beams , these directional jamming signals will severely degrade the system performance. In order to efficiently mitigate the interference of the directional jammers, in this contribution a beam-hopping (BH) communications scheme is proposed. In the proposed BH communications scheme, only one pair of the beams is used for transmission and it hops from one to the next according to an assigned BH pattern. In this contribution a range of expressions in terms of the average SINR performance have been derived, when both the uplink and downlink are considered. The average SINR performance of the proposed BH scheme and that of the conventional single-beam (SB) as well as multiple-beam (MB) assisted beam-processing schemes have been investigated. Our analysis and results show that the proposed BH scheme is capable of efficiently combating the directional jamming, with the aid of utilizing the directional gain of the beams generated by both the transmitter and the receiver. Furthermore, the BH scheme is capable of reducing the intercept probability of the communications. Therefore, the proposed BH scheme is suitable for communications, when several distributed antenna arrays are available around a mobile
Sae Wai, J. & Hu, J.-M. (2023) Twelve new species of Sonerila (Sonerileae, Melastomataceae) from Thailand. Phytotaxa 620 (2): 107-142.
No full textSae Wai, J., Hu, J.-M. (2023): Sae Wai, J. & Hu, J.-M. (2023) Twelve new species of Sonerila (Sonerileae, Melastomataceae) from Thailand. Phytotaxa 620 (2): 107-142. Phytotaxa 622 (2): 172-172, DOI: 10.11646/phytotaxa.622.2.7, URL: https://phytotaxa.mapress.com/pt/article/download/phytotaxa.622.2.7/5125
Chen, M.-J., Han, Y.-R., Hu, J.-X., Liu, Y.-J. & Huang, B. (2023) Tolypocladium rhizomatum sp. nov.: an endophytic species isolated from the rhizome of Polygonatum cyrtonema. Phytotaxa 606 (3): 201-210.
No full textChen, M.-J., Han, Y.-R., Hu, J.-X., Liu, Y.-J., Huang, B. (2023): Chen, M.-J., Han, Y.-R., Hu, J.-X., Liu, Y.-J. & Huang, B. (2023) Tolypocladium rhizomatum sp. nov.: an endophytic species isolated from the rhizome of Polygonatum cyrtonema. Phytotaxa 606 (3): 201-210. Phytotaxa 607 (1): 114-114, DOI: 10.11646/phytotaxa.607.1.10, URL: http://dx.doi.org/10.11646/phytotaxa.607.1.1
[Report to Chief J. E. Curry, by an unknown author #1]
No full textReport to Chief J. E. Curry, by an unknown author. The report contains a list of officers who gave depositions to the United States Attorney
[Report to Chief J. E. Curry, by an unknown author #2]
No full textReport to Chief J. E. Curry, by an unknown author. The report contains a list of officers who gave depositions to the United States Attorney
5391: West Bridgewater, Massachusetts. Wood Hu Kitchens.
No full textJob file for the creation/design of stained glass from either the Charles J. Connick Studio (1912-1945) or the Charles J. Connick Associates studio (1945-1986). The job file contains a job number, location information, date of completion, size, contact information, price, and a description of the project. This particular job file contains information on a job located at: West Bridgewater, Massachusetts. Wood Hu Kitchens
Stress permutations: 3-D distinct element analysis accounts for a common phenomenon in brittle tectonics.
No full textAbsence of static stripes in the two-dimensional t-J model by an accurate and systematic quantum Monte Carlo approach
No full textWe examine the two-dimensional t−J model by using variational approach combined with well established
quantum Monte Carlo techniques [S. Sorella et al., Phys. Rev. Lett. 88, 117002 (2002)] that are used to improve
systematically the accuracy of the variational ansatz. Contrary to recent density-matrix renormalization group
and projected entangled-pair state calculations [P. Corboz et al., Phys. Rev. B 84, 041108(R) (2011)], a uniform
phase is found for J /t = 0.4, even when the calculation is biased with an ansatz that explicitly contains stripe
order. Moreover, in the small hole doping regime, that is, δ 0.1, our results support the coexistence of
antiferromagnetism and superconductivity
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