scholarly journals Reduction of interference using Orthogonal Vertical Beamforming in an indoor communication

2019 ◽  
Vol 277 ◽  
pp. 02013
Author(s):  
Paleerat Wongchampa
Keyword(s):  
Computer Simulation ◽  
Indoor Environment ◽  
Vertical Plane ◽  
Signal Interference ◽  
Transmit Beamforming ◽  
User Throughput ◽  
Noise Ratio

The interference between users is one of the factors that limit the achievable user throughput in the current indoor communication. In this paper, an evaluation of transmit beamforming contribution is analyzed in the context of an indoor environment. The technique of the Orthogonal Vertical Beamforming (OVB) has been proposed to reduce interference in an indoor communication. The proposed concept is validated through computer simulation in term of Signal Interference plus Noise Ratio (SINR). The obtained results show that the OVB provides higher performance over the conventional vertical beamforming and Orthogonal Beamforming (OBFM) in an only vertical plane.

scholarly journals A Prototype Orthogonal Vertical Beamforming for Indoor Wireless Communications

2021 ◽  
pp. 516-521
Author(s):  
Paleerat Wongchampa ◽  
Keyword(s):  
Error Rate ◽  
Horizontal Plane ◽  
Indoor Environment ◽  
Vertical Plane ◽  
Vertical Direction ◽  
Signal Interference ◽  
Packet Error Rate ◽  
Indoor Wireless ◽  
Orthogonal Property ◽  
Indoor Wireless Communications

The concept of Orthogonal Vertical Beamforming (OVB) is proposed in this paper to eliminate interference when users remain at the same angle in the horizontal plane but are positioned at different distances. This orthogonal property helps systems avoid interference in the vertical direction of the mainbeam. A fully constructed prototype tested in a real indoor environment validates the proposed concept, revealing that the proposed OVB provides higher Signal Interference plus Noise Ratio (SINR) and Packet Error Rate (PER) in the vertical plane than conventional vertical beamforming and Orthogonal Beamforming.

scholarly journals Capacity Improvement for DVB-NGH with Dual-Polarized MIMO Spatial Multiplexing and Hybrid Beamforming

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Huu Trung Nguyen ◽  
Trung Tan Le ◽  
Trung Hien Nguyen
Keyword(s):  
Channel Capacity ◽  
Signal To Noise Ratio ◽  
Multiple Input Multiple Output ◽  
Spatial Multiplexing ◽  
Phase Shifters ◽  
Signal Interference ◽  
Single Antenna ◽  
Hybrid Beamforming ◽  
Noise Ratio ◽  
Dual Polarized

Multiple-input multiple-output (MIMO) antenna scheme is an effective technique for future terrestrial broadcasting systems such as digital video broadcasting-next-generation handheld (DVB-NGH) to overcome the limits on information theory of traditional single-antenna wireless communications without any additional bandwidth or increased transmit power. In this paper, we propose a hybrid beamforming scheme for dual-polarized MIMO spatial multiplexing DVB-NGH broadcasting systems. The system of interest makes use of phase shifters and amplitude attenuators for the digital-analog precoder at beamforming stage of the transmitter end to maximize the signal-to-noise ratio to increase the channel capacity of the DVB-NGH systems. At the receiver end, the maximum likelihood (ML) detector is used to evaluate the system performance. We consider the signal-to-interference-and-noise ratio (SINR) and the achievable average capacity for the DVB-NGH MIMO with various FFT sizes, number of transmit antennas, and different modulation schemes. The performance results on bit error rate, channel capacity, and beampatterns show that the proposed hybrid beamforming and dual-polarized MIMO spatial multiplexing schemes provide more robustness against signal interference by beamforming and/or nulling techniques. The simulation results also show that the proposed system achieves higher capacity than the existing MIMO schemes for the DVB-NGH systems.

scholarly journals Computer Simulation and Field Experiment for Downlink Multiuser MIMO in Mobile WiMAX System

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Kazuhiro Yamaguchi ◽  
Takaharu Nagahashi ◽  
Takuya Akiyama ◽  
Hideaki Matsue ◽  
Kunio Uekado ◽  
...  
Keyword(s):  
Computer Simulation ◽  
Field Experiment ◽  
Channel Capacity ◽  
Mimo Systems ◽  
Multipath Fading ◽  
Signal Interference ◽  
Mobile Wimax ◽  
Transmission Performance ◽  
Mimo Transmission ◽  
Wimax System

The transmission performance for a downlink mobile WiMAX system with multiuser multiple-input multiple-output (MU-MIMO) systems in a computer simulation and field experiment is described. In computer simulation, a MU-MIMO transmission system can be realized by using the block diagonalization (BD) algorithm, and each user can receive signals without any signal interference from other users. The bit error rate (BER) performance and channel capacity in accordance with modulation schemes and the number of streams were simulated in a spatially correlated multipath fading environment. Furthermore, we propose a method for evaluating the transmission performance for this downlink mobile WiMAX system in this environment by using the computer simulation. In the field experiment, the received power and downlink throughput in the UDP layer were measured on an experimental mobile WiMAX system developed in Azumino City in Japan. In comparison with the simulated and experimented results, the measured maximum throughput performance in the downlink had almost the same performance as the simulated throughput. It was confirmed that the experimental mobile WiMAX system for MU-MIMO transmission successfully increased the total channel capacity of the system.

A high‐frequency sparker source for the borehole environment

Geophysics ◽  
1993 ◽  
Vol 58 (5) ◽  
pp. 660-669 ◽  
Author(s):  
Richard D. Rechtien ◽  
K. L. Hambacker ◽  
R. F. Ballard
Keyword(s):  
High Frequency ◽  
Arc Discharge ◽  
Signal To Noise Ratio ◽  
Salt Water ◽  
Low Cost ◽  
Vertical Plane ◽  
Seismic Source ◽  
Coaxial Cable ◽  
Signal To Noise ◽  
Noise Ratio

For tomographic investigations of shallow subsurface features of limited lateral extent, a high‐frequency, low‐cost borehole seismic source would be highly desirable, particularly for investigators with limited budgets. We constructed a simple, arc‐discharge seismic source from off‐the‐shelf items. This source consists of a salt water filled bottle containing exposed conductors of a coaxial cable, across which 100 to 300 joules of electrical power were discharged. This source produced a seismic pulse with a dominant frequency in the neighborhood of 1.5 kHz and a half‐power bandwidth in excess of 1 kHz. Repeatability of seismic signatures in a variety of environmental settings was excellent. Sufficient power was generated to observe seismic signals with at least a 35 dB signal‐to‐noise ratio at horizontal borehole separations of 100 m. For a borehole separation of 33.2 m, signals with at least a 35 dB signal‐to‐noise ratio were observed at angular ranges in the vertical plane to 68 degrees. The hydrostatic head limit for this source was determined to be approximately 430 m.

COMPUTER SIMULATION OF PHOTON ANTICORRELATION EXPERIMENT USING ADDITIVE PRE-DETECTION NOISE AND FINITE INSTRUMENT BANDWIDTH

2002 ◽  
Vol 13 (06) ◽  
pp. 823-828
Author(s):  
S. SULCS ◽  
C. F. OSBORNE
Keyword(s):  
Computer Simulation ◽  
Quantum Optics ◽  
Quantum Computer ◽  
Signal To Noise Ratio ◽  
Computer Applications ◽  
Maxwell Field ◽  
Signal To Noise ◽  
Optical Fields ◽  
Noise Ratio

The photon anticorrelation experiment is simulated with the unquantized Maxwell field by implementing realistic instrument bandwidth and signal to noise ratio. The results strongly violate an inequality believed to be satisfied by all semiclassical theories, which opens up a classical interpretation that rivals quantum optics and casts doubt on potential quantum computer applications that involve optical fields.

scholarly journals A grafo-numeric method of determination of the operation power of the rotor of EsRc-1400 bucket wheel excavator using computer simulation in SolidWorks

2019 ◽  
Vol 290 ◽  
pp. 04007
Author(s):  
Florin Dumitru Popescu ◽  
Sorin Mihai Radu ◽  
Andrei Andraş ◽  
Ildiko Kertész Brînaş
Keyword(s):  
Computer Simulation ◽  
Energy Consumption ◽  
Specific Energy ◽  
Horizontal Plane ◽  
Specific Energy Consumption ◽  
Vertical Plane ◽  
Conveyor System ◽  
Method Of Determination ◽  
Loading System

The bucket wheel excavator (BWE) is a complex continuous digging machine, used to excavate material using a layout of buckets installed on a rotor (bucket wheel), and at the same time, using the conveyor system installed on its boom, transferring this material to the main conveyor. The bucket wheel is the operating equipment, and it rotates in the vertical plane and performs (with the boom) a pivoting movement in the horizontal plane and an ascendant – descendent movement in the vertical plane. The paper presents a new grafo-numeric method of determination of the operation power of the BWE rotor, using computer simulation in SolidWorks. The aim of using virtual models for the analysis of the operation of some components of the BWE is to reduce the specific energy consumption during cutting while maintaining the installed operation power of the rotor, to increase the excavation capacity and to improve the cutting – loading system.

Practices on Sustainable Design for College Sports Building — Take Zhengzhou Tourism College Stadium as an Example

2012 ◽  
Vol 174-177 ◽  
pp. 3130-3133
Author(s):  
Feng Wei ◽  
Dong He ◽  
Xiao Yu Han
Keyword(s):  
Computer Simulation ◽  
Life Cycle ◽  
Energy Consumption ◽  
Indoor Environment ◽  
Sustainable Design ◽  
Low Cost ◽  
College Sports ◽  
Space Efficiency ◽  
Running Cost ◽  
Save Energy

Huge space and shape lead college sports buildings a lot of energy-consumption. Reduce the running energy-consumption is of great importance to save energy and decrease the running cost. This article introduced the using of computer simulation to analysis the design progress in 3 aspects: space efficiency, low running energy-consumption and innocuous design of the life-cycle of building; discussed how to use appropriate low-cost technologies to save energy and make comfortable indoor environment of college sports buildings, and finally argued that using low-cost technologies is effective way to design a green college sports building.

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