MU-MIMO Pairing Algorithm Using Received Power

AbstractIn wireless rechargeable sensor network, the deployment of charger node directly affects the overall charging utility of sensor network. Aiming at this problem, this paper abstracts the charger deployment problem as a multi-objective optimization problem that maximizes the received power of sensor nodes and minimizes the number of charger nodes. First, a network model that maximizes the sensor node received power and minimizes the number of charger nodes is constructed. Second, an improved cuckoo search (ICS) algorithm is proposed. This algorithm is based on the traditional cuckoo search algorithm (CS) to redefine its step factor, and then use the mutation factor to change the nesting position of the host bird to update the bird’s nest position, and then use ICS to find the ones that maximize the received power of the sensor node and minimize the number of charger nodes optimal solution. Compared with the traditional cuckoo search algorithm and multi-objective particle swarm optimization algorithm, the simulation results show that the algorithm can effectively increase the receiving power of sensor nodes, reduce the number of charger nodes and find the optimal solution to meet the conditions, so as to maximize the network charging utility.

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An Indoor Visible Light Positioning System Using Tilted LEDs with High Accuracy

Sensors ◽

10.3390/s21030920 ◽

2021 ◽

Vol 21 (3) ◽

pp. 920

Author(s):

Neha Chaudhary ◽

Othman Isam Younus ◽

Luis Nero Alves ◽

Zabih Ghassemlooy ◽

Stanislav Zvanovec ◽

...

Keyword(s):

Visible Light ◽

Polynomial Regression ◽

Power Level ◽

Least Square ◽

Line Of Sight ◽

Received Power ◽

Strength Based ◽

Complex Linear ◽

Linear Least Square ◽

First Time

The accuracy of the received signal strength-based visible light positioning (VLP) system in indoor applications is constrained by the tilt angles of transmitters (Txs) and receivers as well as multipath reflections. In this paper, for the first time, we show that tilting the Tx can be beneficial in VLP systems considering both line of sight (LoS) and non-line of sight transmission paths. With the Txs oriented towards the center of the receiving plane (i.e., the pointing center F), the received power level is maximized due to the LoS components on F. We also show that the proposed scheme offers a significant accuracy improvement of up to ~66% compared with a typical non-tilted Tx VLP at a dedicated location within a room using a low complex linear least square algorithm with polynomial regression. The effect of tilting the Tx on the lighting uniformity is also investigated and results proved that the uniformity achieved complies with the European Standard EN 12464-1. Furthermore, we show that the accuracy of VLP can be further enhanced with a minimum positioning error of 8 mm by changing the height of F.

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4G LTE Experience: Reference Signal Received Power, Noise Ratio and Quality

2021 3rd East Indonesia Conference on Computer and Information Technology (EIConCIT) ◽

10.1109/eiconcit50028.2021.9431853 ◽

2021 ◽

Author(s):

Gubtha Mahendra Putra ◽

Edy Budiman ◽

Yonatan Malewa ◽

Dedy Cahyadi ◽

Medi Taruk ◽

...

Keyword(s):

Reference Signal ◽

Received Power ◽

Power Noise ◽

Noise Ratio ◽

4G Lte

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3GPP Channel Model Emulation with Analysis of MIMO-LTE Performances in Reverberation Chamber

International Journal of Antennas and Propagation ◽

10.1155/2012/239420 ◽

2012 ◽

Vol 2012 ◽

pp. 1-8 ◽

Cited By ~ 15

Author(s):

Nabil Arsalane ◽

Moctar Mouhamadou ◽

Cyril Decroze ◽

David Carsenat ◽

Miguel Angel Garcia-Fernandez ◽

...

Keyword(s):

Channel Model ◽

Reference Case ◽

Reverberation Chamber ◽

Single Input Single Output ◽

Single Output ◽

Received Power ◽

Communication Devices ◽

Set Up ◽

Multiple Clusters ◽

Active Link

Emulation methodology of multiple clusters channels for evaluating wireless communication devices over-the-air (OTA) performance is investigated. This methodology has been used along with the implementation of the SIMO LTE standard. It consists of evaluating effective diversity gain (EDG) level of SIMO LTE-OFDM system for different channel models according to the received power by establishing an active link between the transmitter and the receiver. The measurement process is set up in a Reverberation Chamber (RC). The obtained results are compared to the reference case of single input-single output (SISO) in order to evaluate the real improvement attained by the implemented system.

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Dual-Band RF Wireless Power Transfer System with a Shared-Aperture Dual-Band Tx Array Antenna

Energies ◽

10.3390/en14133803 ◽

2021 ◽

Vol 14 (13) ◽

pp. 3803

Author(s):

Chan-Mi Song ◽

Hong-Jun Lim ◽

Son Trinh-Van ◽

Kang-Yoon Lee ◽

Youngoo Yang ◽

...

Keyword(s):

Wireless Power Transfer ◽

Transmission Efficiency ◽

Array Antenna ◽

Dual Band ◽

Single Frequency ◽

Power Transfer ◽

Wireless Power ◽

Beam Focusing ◽

Received Power ◽

Rf Wireless

In this paper, a dual-band RF wireless power transfer (WPT) system with a shared-aperture dual-band Tx array antenna for 2.4 and 5.8 GHz is proposed. The final configuration of the Tx array, which is made up of 2.4 GHz right-handed circular polarization (RHCP) patches and 5.8 GHz RHCP patches, is derived from the optimization of 2.4 and 5.8 GHz thinned arrays, ultimately to achieve high transmission efficiency for various WPT scenarios. The dual-band RF WPT Tx system including the Tx array antenna and a Tx module is implemented, and Rx antennas with a 2.4 GHz patch, a 5.8 GHz patch, and a dual-band (2.4 and 5.8 GHz) patch are developed. To validate the proposed dual-band RF WPT system, WPT experiments using a single band and dual bands were conducted. When transmitting RF wireless power on a single frequency (either 2.482 GHz or 5.73 GHz), the received power according to the distance between the Tx and Rx and the position of the Rx was measured. When the distance was varied from 1 m to 3.9 m and the transmitted power was 40 dBm, the received power value at 2.482 GHz and 5.73 GHz were measured and found to be 24.75–13.5 dBm (WPT efficiency = 2.985–0.224%) and 19.25–6.8 dBm (WPT efficiency = 0.841–0.050%), respectively. The measured results were in good agreement with the calculated results, and it is revealed that the transmission efficiency when wireless power is transmitted via beam-focusing increases more than that with conventional beam-forming. Furthermore, the dual-band WPT experiment proves that 2.482 GHz beam and 5.73 GHz beams can be formed individually and that their wireless power can be transmitted to a dual-band Rx or two different Rx.

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Variable Link Performance Due to Weather Effects in a Long-Range, Low-Power LoRa Sensor Network

Sensors ◽

10.3390/s21093128 ◽

2021 ◽

Vol 21 (9) ◽

pp. 3128

Author(s):

Thomas Ameloot ◽

Patrick Van Torre ◽

Hendrik Rogier

Keyword(s):

Sensor Networks ◽

Low Power ◽

Sensor Network ◽

Link Quality ◽

Long Distance ◽

Received Power ◽

Link Performance ◽

Weather Changes ◽

Minimal Power Consumption ◽

Seasonal Weather

When aiming for the wider deployment of low-power sensor networks, the use of sub-GHz frequency bands shows a lot of promise in terms of robustness and minimal power consumption. Yet, when deploying such sensor networks over larger areas, the link quality can be impacted by a host of factors. Therefore, this contribution demonstrates the performance of several links in a real-world, research-oriented sensor network deployed in a (sub)urban environment. Several link characteristics are presented and analysed, exposing frequent signal deterioration and, more rarely, signal strength enhancement along certain long-distance wireless links. A connection is made between received power levels and seasonal weather changes and events. The irregular link performance presented in this paper is found to be genuinely disruptive when pushing sensor-networks to their limits in terms of range and power use. This work aims to give an indication of the severity of these effects in order to enable the design of truly reliable sensor networks.

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Node geometry and broadband jamming in noncooperative relay networks under received power constraint

34th IEEE Sarnoff Symposium ◽

10.1109/sarnof.2011.5876476 ◽

2011 ◽

Cited By ~ 17

Author(s):

Kanghee Lee ◽

Hyuck M. Kwon ◽

Yanwu Ding ◽

Yazan Ibdah ◽

Zuojun Wang ◽

...

Keyword(s):

Relay Networks ◽

Power Constraint ◽

Received Power

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