High-accuracy positioning using phase difference of electrode array for two-dimensional communication sensor network (2DCSN)

Oota, Toshifumi; Matsukawa, Takashi; Kado, Yuichi; Zhang, Bing

doi:10.1109/icsens.2011.6127334

Cited by 6 publications

(2 citation statements)

References 4 publications

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“…The pushpin on the device creates a hole through the insulation layer to make contact with the conductive sheets so as to transfer power and data. [34,42,56] uses an insulation layer to separate a metallic sheet and a specially designed metal sheet with a mesh pattern. This particular pattern allows the devices to be placed in contact with the surface using a contact that is the size of a Wi-Fi antenna, but without pushpins.…”

Section: Related Workmentioning

confidence: 99%

Surface MIMO

Chan

Wang

Iyer

et al. 2018

Proceedings of the 24th Annual International Conference on Mobile Computing and Networking

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As connected devices continue to decrease in size, we explore the idea of leveraging everyday surfaces such as tabletops and walls to augment the wireless capabilities of devices. Specifically, we introduce Surface MIMO, a technique that enables MIMO communication between small devices via surfaces coated with conductive paint or covered with conductive cloth. These surfaces act as an additional spatial path that enables MIMO capabilities without increasing the physical size of the devices themselves. We provide an extensive characterization of these surfaces that reveal their effect on the propagation of EM waves. Our evaluation shows that we can enable additional spatial streams using the conductive surface and achieve average throughput gains of 2.6-3x for small devices. Finally, we also leverage the wideband characteristics of these conductive surfaces to demonstrate the first Gbps surface communication system that can directly transfer bits through the surface at up to 1.3 Gbps.

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Section: Related Workmentioning

confidence: 99%

Surface MIMO

Chan

Wang

Iyer

et al. 2018

Proceedings of the 24th Annual International Conference on Mobile Computing and Networking

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“…After conversion to an I/Q signal, A/D conversion was performed to create a digital value, which was stored in SRAM. Phase measurement was performed with a digital circuit because we assumed applications to position measurement and time‐divided power transmission to several devices with the phase stored after digitization. The phase of each electrode can be found as

\arctan (I / Q)

(the sign of I inverts the phase by π).…”

Section: Setup Of the Proposed System And Evaluation Of Measurementsmentioning

confidence: 99%

Wireless Power Transmission via Sheet Medium Using Automatic Phase Adjustments of Multiple Inputs

Matsukawa

Oota

Kado

et al. 2014

Electrical Engineering Japan

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SUMMARY Wireless power transmission via a sheet medium is a novel physical form of communication that utilizes a surface as a medium to provide both data and power transmission services. To efficiently transmit a relatively large amount of electric power (several watts), we have developed a wireless power transmission system via sheet medium that concentrates electric power on a specific spot by using phase control of multiple inputs. However, to find the optimal phases of the multiple inputs that let the microwave energy converge on a specific spot in the sheet medium, prior knowledge of the device's position and a preliminary experiment measuring the output power are needed. In the field of wireless communication, it is known that the retrodirective array scheme can efficiently transmit power in a self‐phasing manner, which uses pilot signals sent by client devices. In this paper, we apply the retrodirective array scheme to our wireless power transmission system via a sheet medium, and propose a power transmission scheme using the phase‐adjusted power transmission inputs. To confirm the effectiveness of the proposed scheme, we evaluate its performance by computer simulation and real‐world measurement. Both results show that the proposed scheme can achieve retrodirectivity over wireless power transmission via a sheet medium.

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