In recent years, intelligent reflecting surfaces (IRSs) for large-capacity and highly reliable wireless communication have attracted widespread attention. However, a multiuser access system with multiple IRSs poses limitations in reducing the large signaling overhead of channel estimation numerous links between users. One approach to reduce exhaustive involves associating IRS user performing beam tracking certain period. as IRS–user association is fixed during period, dynamic variations...

Wireless sensing is a promising technology for future wireless communication networks to realize various application services. local area network (WLAN)-based localization approaches using channel state information (CSI) have been investigated intensively. Further improvements of detection performance will depend on selecting appropriate feature and determining the placements distributed antenna elements. This paper presents proposal an enhanced device-free WLAN-based scheme with...

Sensing services for the detection of humans and animals by analyzing environmental changes wireless local area network (WLAN) signals have attracted attention in recent years. In object using WLAN signals, a widely known technique is use time received signal strength indicators that are easily measured between devices. Utilizing channel response, including power phase values per subcarrier on multiple input output (MIMO), orthogonal frequency division multiplexing transmission was...

In recent years, the functionality of wireless communications has not only been limited to communication between users, but also extended sensing applications. fact, several WLAN-based technologies, which rely on changes in multipath radio propagation derived from a channel state information (CSI) indoor environments, have already developed. this paper, we present outdoor human detection system - first IEEE 802.11ac WLAN CSI-based attempts. The number multipaths an environment is limited,...

This study aims to determine the upper limit of wireless sensing capability acquiring physical space information. is a challenging objective because, at present, studies continue succeed in novel phenomena. Thus, although we have still not obtained complete answer, step taken toward it herein. To achieve this, CSI2Image, channel state information (CSI)-to-image conversion method based on generative adversarial networks (GANs), proposed. The type acquired using can be estimated by checking...

Various machine learning (ML) based localization schemes using channel state information (CSI) in wireless local area networks (WLANs) have been investigated recently. Adopting a proper feature selection technique is important to achieve further improvement detection accuracy. As described herein, we propose device-free indoor scheme lightweight ML model with compressed spatially concatenated CSI WLAN systems distributed antennas. In this scheme, feedback beam-forming weights (BFWs) are...

Massive multi-user multiple-input multiple-output (MU-MIMO), in which access points (APs) with a lot of antennas transmit to stations (STAs) few antennas, is attractive for wireless LAN systems due its potential greatly increase throughput. However, the throughput improvement at media control - service point (MAC-SAP) massive antenna limited by overhead imposed channel state information (CSI) feedback. In this letter, we clarify problem CSI feedback and evaluate two frame sequences implicit...

There is a demand for device-free user location estimation with high accuracy in order to realize various indoor applications. This paper proposes an IEEE 802.11ac explicit feedback-based channel state information (CSI) learning system which can be used estimation. The proposed CSI captures feedback from off-the-shelf Wi-Fi devices and extracts 624 features frame defined 802.11ac. We evaluated the using six patterns: different combinations of movement access point antenna orientation....

Recently, WLAN-based wireless sensing technologies, which utilize WLAN devices widely used in many environments, have been focused because of their low deployment cost. We presented an outdoor human detector using IEEE802.11ac channel state information (CSI) for line-of-sight (LOS) scenarios our previous work [1]. In this paper, we extend and present a CSI-based detection system non-line-of-sight (NLOS) scenarios. The key idea is to CSI retrieved by multiple extracted features principal...

The information terminal bus stop has been studied widely. It is reported that the for citizen support effective purpose of improving citizens' convenience. In particular, location system considered important eliminating users' concern about what time will it arrive?, Will arrive at all?; thus, there a great deal research. Because conventional systems need communication charges, are problems including introduction and maintenance costs high. Therefore, method using Wi-SUN proposed. However,...

Owing to the recent proliferation of smartphones and SNS, a large number images taken by at various places have been uploaded SNSs. In addition, are equipped with sensors such as Wi-Fi modules that enable us generate an image associated sensory information represents context in which was captured. This study demonstrates benefits signals automated construction Wi-Fi-based indoor logical location classifier predicts semantic label user's position for shopping complexes. this study, class...

For the safe and efficient use of lithium-ion batteries, state charge (SOC) is a particularly important variable. In this paper, we propose method for online estimation SOC model parameters based on fractional-order equivalent circuit model. Firstly, constructed battery that includes pseudo-capacitance determined values elements offline using least squares from actual input–output data driving profile an automobile. Compared to integer-order model, confirmed proposed has higher accuracy....

As microcell wireless systems become more widespread, intercell interference among the access points will increase due to limited frequency resource. In overlapping cell scenario, radio resources should be shared by multiple cells. Although time and resource sharing has been described in many papers, there is no detailed report on dynamic spatial cells for systems. Thus, we present effectiveness of two points. We introduce scenarios based zero forcing method; one primary-secondary AP...

This paper investigates the effectiveness of multiple input output (MIMO) transmission with aid relay nodes by using measured outdoor channel state information (CSI) for source, relay, and destination which are used in cooperative transmission. Single/multi-user MIMO (SU/MU-MIMO) systems have attracted much attention as technology enhances capacity a limited frequency band. In this paper, station is applied to SU/MU-MIMO systems: Relay Although performance affected actual propagation...

The authors propose a WLAN with distributed smart antenna system (D‐SAS) that can suppress interference and improve the throughput in high‐density scenarios such as stadiums shopping malls. also demonstrate prototype of D‐SAS show experimental results which proposed achieves more than twice conventional centralised system.

A cooperative inter-cell interference (ICI) mitigation scheme with transmit beamforming for dense wireless LAN systems is proposed. The proposed applies used downlink multiuser MIMO in order to mitigate the effect of ICI and selectively determines whether an access point (AP) performs null each station (STA) overlapping basic service sets (OBSSs) according power. Null suppress if its power exceeds a threshold, otherwise, it not carried out antenna obtain diversity gain STAs associated AP....

Among various single-cell analysis platforms, hydrodynamic cell trapping systems remain relevant because of their versatility. those, deterministic cell-trapping have received significant interest; however, applications are limited trapped cells kept within the closed microchannel, thus prohibiting access to external cell-picking devices. In this study, we develop a system in an open microfluidics architecture allow cells. A technique render only inside polydimethylsiloxane (PDMS)...

In this paper, the wireless positioning performance of Time Of Flight (TOF) -based method and TOF-Direction Arrival (DOA) hybrid is experimentally compared in an indoor environment, where only single anchor used for both scenarios. The experiment was conducted a shielded room. average estimation errors TOF TOF-DOA are 18.6 cm 8.9 cm, respectively, three antenna elements closely packed with half-wavelength element spacing at station. This result reveals that realizes accurate fairly compact array

Monitoring crowdedness in public spaces such as shopping malls is useful for various services like marketing, safety, evacuation planning. For infrastructure-based people counting, Wi-Fi Channel State Information (CSI) has attracted attention it does not require any additional deployment. However, the existing approaches assume multiple fixed infrastructures access points (APs), which different from standard AP deployment since they are installed wireless network services. To solve this...

In this paper, we investigate a machine learning based object detection scheme utilizing channel state information (CSI) in wireless local area network (WLAN) systems with multiple distributed antennas, and evaluate the impact of antenna placement on achieved probability, where CSI frames captured from nearby devices are used for detection. To improve objective accuracy, also method to distribute transmit receive antennas target acquiring sufficient amount CSI, support vector (SVM) is as...