Synchronization sequence design for mmWave cellular systems

2014 ◽  
Author(s):  
Shadi Abu-Surra ◽  
Sridhar Rajagopal ◽  
Xiaojie Zhang
Keyword(s):  
Cellular Systems ◽  
Sequence Design

scholarly journals Sequence Design Technique for Accurate Timing and Cell ID Estimation in Underwater Acoustic Cellular Systems with a High Doppler

Electronics ◽  
2021 ◽  
Vol 10 (19) ◽  
pp. 2413
Author(s):  
Yeong Jun Kim ◽  
Muhammad Asim ◽  
Tae Ho Im ◽  
Yong Soo Cho
Keyword(s):  
Doppler Shift ◽  
Additive White Gaussian Noise ◽  
Cellular Systems ◽  
Joint Estimation ◽  
Sensor Nodes ◽  
Sequence Length ◽  
Design Technique ◽  
Sequence Design ◽  
Underwater Acoustic ◽  
Simulation Results

In underwater acoustic cellular (UWAC) systems, underwater equipment or sensor nodes (UE/SN) should perform downlink synchronisation and a cell search during the initial access stage using the preambles received from adjacent underwater base stations (UWBSs). The UE/SN needs to estimate accurate timing and cell ID (CID) using the received preambles, and synchronise with a serving UWBS, even in high-Doppler environments. In this paper, a sequence design technique for joint estimation of accurate timing and CID in UWAC systems with a high Doppler is proposed to decrease the receiver complexity and processing time. A generalised Zadoff–Chu sequence is proposed for the preamble design. This sequence is decomposed into multiple short sub-sequences to reduce the effect of Doppler shift on the timing and CID estimation. The performance loss caused by the short sequence length is compensated by combining the sub-sequences using the repetition property of the ZC sequence. The properties (autocorrelation and cross-correlation) of the proposed sequence are derived analytically in the presence of Doppler shift and compared with the simulation results. The simulation results reveal that the proposed technique performs better than existing techniques in both additive white Gaussian noise and multipath channels with a high-Doppler. It is concluded that the proposed technique is suitable for accurate timing estimation and CID detection in UWAC systems with a high Doppler.

scholarly journals Doppler-tolerant sequence design for positioning high-speed vehicles in millimeter-wave cellular systems

2021 ◽  
pp. 100358
Author(s):  
Mohammed Saquib Khan ◽  
Chang Hwan Park ◽  
Jingon Joung ◽  
Yong Soo Cho
Keyword(s):  
Millimeter Wave ◽  
High Speed ◽  
Cellular Systems ◽  
Sequence Design

scholarly journals Pilot Sequence Design for mmWave Cellular Systems With Relay Stations in the Presence of Blockage

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 80454-80467
Author(s):  
Yeong Jun Kim ◽  
Qasim Sultan ◽  
Yong Soo Cho
Keyword(s):  
Cellular Systems ◽  
Sequence Design ◽  
Relay Stations

Label-free, mass-sensitive single-molecule imaging using interferometric scattering microscopy

2020 ◽  
Author(s):  
Nikolas Hundt
Keyword(s):  
Single Molecule ◽  
Cellular Systems ◽  
Single Molecule Imaging ◽  
Label Free ◽  
Measurement Sensitivity ◽  
Mass Distributions ◽  
Quantitative Measurements ◽  
Contrast Mechanism ◽  
Cellular Components ◽  
Scattering Signal

Abstract Single-molecule imaging has mostly been restricted to the use of fluorescence labelling as a contrast mechanism due to its superior ability to visualise molecules of interest on top of an overwhelming background of other molecules. Recently, interferometric scattering (iSCAT) microscopy has demonstrated the detection and imaging of single biomolecules based on light scattering without the need for fluorescent labels. Significant improvements in measurement sensitivity combined with a dependence of scattering signal on object size have led to the development of mass photometry, a technique that measures the mass of individual molecules and thereby determines mass distributions of biomolecule samples in solution. The experimental simplicity of mass photometry makes it a powerful tool to analyse biomolecular equilibria quantitatively with low sample consumption within minutes. When used for label-free imaging of reconstituted or cellular systems, the strict size-dependence of the iSCAT signal enables quantitative measurements of processes at size scales reaching from single-molecule observations during complex assembly up to mesoscopic dynamics of cellular components and extracellular protrusions. In this review, I would like to introduce the principles of this emerging imaging technology and discuss examples that show how mass-sensitive iSCAT can be used as a strong complement to other routine techniques in biochemistry.

Achievable Capacity of Closed/Open-Access Cognitive Radio Systems Coexisting with a Macro Cellular Systems

2012 ◽  
Vol E95-B (4) ◽  
pp. 1190-1197
Author(s):  
Hiromasa FUJII ◽  
Hiroki HARADA ◽  
Shunji MIURA ◽  
Hidetoshi KAYAMA
Keyword(s):  
Cognitive Radio ◽  
Open Access ◽  
Cellular Systems ◽  
Cognitive Radio Systems ◽  
Radio Systems ◽  
Macro Cellular
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