In this paper, we design and develop RIO, a novel battery-free touch sensing user interface (UI) primitive for future IoT smart spaces. RIO enables UIs to be constructed using off-the-shelf RFID readers tags, provides unique approach designing With any surface can turned into touch-aware by simply attaching tags them. also supports custom-designed thus allows specially customized easily deployed real-world environment. is built the technique of impedance tracking: when human finger touches...

Material sensing is an essential ingredient for many IoT applications. While hyperspectral camera, infrared, X-Ray, and Radar provide potential solutions material identification, high cost the major concern limiting their In this paper, we explore capability of employing RF signals fine-grained with commodity RFID device. The key reason our system to work that tag antenna's impedance changed when it close or attached a target. amount change dependent on target's type, thus enabling us...

The advances in unmanned aerial vehicle (UAV) technology have empowered mobile operators to deploy LTE base stations (BSs) on UAVs, and provide on-demand, adaptive connectivity hotspot venues as well emergency scenarios. However, today's evolved packet core (EPC) that orchestrates the RAN faces fundamental limitations catering such a challenging, wireless UAV environment, particularly presence of multiple BSs (UAVs). In this work, we argue for propose an alternate, radical edge EPC design,...

In this work, we explore the potential and impact of unlicensed LTE on WiFi in spectrum. Our experiments demonstrate that large asymmetry channel access methodologies employed by (carrier sensing/notification WiFi, energy sensing alone LTE-U), can result LTE-U completely blocking transmissions, causing significant degradation to either technologies from collisions.

We envision a flexible, dynamic airborne LTE infrastructure built upon Unmanned Autonomous Vehicles (UAVs) that will provide on-demand, on-time, network access, anywhere. In this paper, we design, implement and evaluate SkyRAN, self-organizing UAV-based RAN (Radio Access Network) is key component of UAV network. SkyRAN determines the UAV's operating position in 3D airspace so as to optimize connectivity all UEs on ground. It realizes by overcoming various challenges constructing maintaining...

Large-scale multiuser MIMO (MU-MIMO) systems have the potential for multi-fold scaling of network capacity. The research community has recognized this theoretical and developed architectures [1,2] with large numbers RF chains. Unfortunately, building hardware a number chains is challenging in practice. CSI data transport computational overhead MU-MIMO beamforming can also become prohibitive under scale. Furthermore, it difficult to physically append extra on existing communication equipments...

The recent innovation of frequency-shifted (FS) backscatter allows for backscattering with commodity devices, which are inherently half-duplex. However, their reliance on oscillators generating the frequency-shifting signal tag, forces them to incur transient phase oscillator before steady-state operation. We show how oscillator's can pose a fundamental limitation battery-less tags, resulting in significantly low bandwidth efficiencies, thereby limiting practical usage.

Un-manned aerial vehicle (UAVs) have the potential to change landscape of wide-area wireless connectivity by bringing them areas where was sparing or non-existent (e.g. rural areas) has been compromised due disasters. While Google's Project Loon and Facebook's Aquila are examples high-altitude, long-endurance UAV-based efforts in this direction, telecom operators AT&T Verizon) exploring low-altitude LTE solutions for on-demand deployments. Understandably, these projects their early...

Immersive telepresence has the potential to revolutionize remote communication by offering a highly interactive and engaging user experience. However, state-of-the-art exchanges large volumes of 3D content achieve satisfactory visual quality, resulting in substantial Internet bandwidth consumption. To tackle this challenge, we introduce MagicStream, first-of-its-kind semantic-driven immersive system that effectively extracts delivers compact semantic details captured representation users,...

Enabling wireless full-duplex (from an AP) with multiple half-duplex (HD) clients is key to widespread adoption of (FD) in commercial networks. However, enabling FD such networks fundamentally challenged by a new form uplink-downlink interference (UDI), arising between HD operating simultaneously the uplink and downlink directions. In this context, we first show that spatial alignment (IA) effective scalable technique address UDI hence enable these networks, especially presence MIMO.

Spectrum management and device coordination for Dynamic Access (DSA) networks have received significant research attention. However, current wireless devices yet to fully embrace DSA due the difficulties in realizing spectrum-agile communications. We address practical hurdles present solutions towards implementing devices, answering an important question "what is a simple extension that makes them spectrum-agile?" To this end, we propose RODIN, general per-frame spectrum-shaping protocol has...

Retailers are aiming to enhance customer experience by automating the checkout process. The key impediment here is effort manually align product barcode with scanner, requiring sequential handling of items without blocking line-of-sight laser beam. While recent systems such as Amazon Go eliminate human involvement using an extensive array cameras, we propose a privacy-preserving alternative, RFGo, that identifies products passive RFID tags. Foregoing continuous monitoring customers...

mmWave 5G networks promise to enable a new generation of networked applications requiring combination high throughput and ultra-low latency. However, in practice, performance scales poorly for large numbers users due the significant overhead required manage highly-directional beams. We find that we can substantially reduce or eliminate this by using out-of-band infrared measurements surrounding environment generated LiDAR sensor. To accomplish this, develop ray-tracing system is robust noise...

In this paper, we introduce a Radio Frequency IDentification (RFID) based smart shopping system, KONARK, which helps users to checkout items faster and track purchases in real-time. parallel, our solution also provides the mall owner with information about user interest on particular items. The central component of KONARK system is customized cart having RFID reader reads tagged To provide check-out facility, detects in-cart almost 100% accuracy within 60s delay by exploiting fact that...

We design and build SKYHAUL, the first large-scale, autonomous, self-organizing network of Unmanned Aerial Vehicles (UAVs) that are connected using a mmWave wireless mesh backhaul. While use backhaul paves way for new class bandwidth-intensive, latency-sensitive cooperative applications (e.g., LTE coverage during disasters, surveillance rescue in challenging terrains), UAVs allows these to be executed at operating ranges far beyond line-of-sight distances limit individual today. To realize...

Due to the widespread adoption of "work-from-home" policies, videoconferencing applications (e.g., Zoom) have become indispensable for remote communication. However, these systems lack immersiveness, leading so-called "Zoom fatigue" and degrading communication efficiency. The recent debut Apple Vision Pro, a mixed reality headset that supports "spatial persona", aims offer an immersive telepresence experience with applications. In this paper, we conduct first-of-its-kind in-depth empirical...

The uncoordinated deployment of many high-bandwidth 802.11a/g/n access points (APs) in urban areas offers the potential for WLANs to be a strong complement cellular networks providing ubiquitous connectivity. However, given that bandwidth backhaul links connected these APs is often an order-of-magnitude lower than WLAN channel, aggregating throughput from multiple necessary order client achieve acceptable level network performance. In this paper, we present Sidekick - simple and novel AP...

Deploying LTE networks in unlicensed spectrum requires us to move beyond coexistence mechanisms and understand the suitability of LTE's synchronous operation a that is governed by asynchronous access principles. Our study reveals fundamental conflict uplink arises between scheduled nature multi-user transmissions -- critical for leveraging diversity (OFDMA) multiplexing (multi-user MIMO) gains interference on clients. The result significant loss utilization throughput scales with number...

Equipped with the multi-user MIMO (MU-MIMO) technology, a WiFi access point (AP) M antennas can achieve degrees-of-freedom (DoF) in theory. Existing MU-MIMO protocols strive to maximize DoF usage by serving users simultaneously. In this paper, through testbed measurement, we found that correlation between users' channels severely compromise network throughput under DoF-maximizing strategy. To combat problem, propose Kardia judiciously distributes least-correlated within an AP's cell, and...

In this paper, we propose to use commercial off-the-shelf (COTS) <i>monostatic</i> RFID devices (i.e. which a single antenna at time for both transmitting and receiving signals from the tags) monitor browsing activity of customers in front display items places such as retail stores. To end, <i>TagSee</i> , multi-person imaging system based on monostatic imaging. TagSee is insight that when are shelf, they stand between tags deployed along boundaries shelf reader, changes multi-paths travel...

A large number of traffic collisions occur as a result obstructed sight lines, such that even an advanced driver assistance system would be unable to prevent the crash. Recent work has proposed use around-the-corner radar systems detect vehicles, pedestrians, and other road users in these occluded regions. Through comprehensive measurement, we show existing techniques cannot sense moving objects many important real-world scenarios. To solve this problem limited coverage, leverage multiple,...

Low-latency, low-overhead and reliable control channels are essential to the efficient operation of wireless networks. However, that utilize current in-band out-of-band designs do not fully meet this requirement. In paper, we design implement Aileron, a novel channel based on automatic modulation recognition carries frames over an OFDM(A) PHY by varying rate OFDM subcarriers. With information is embedded into type, as actual symbol value. The thus-transmitted can be received with little no...

Deploying LTE networks on modern UAVs requires a redesign of the key components architecture. In this article, we propose radical, edge-EPC design, called SkyCore, that pushes one its central functionalities, namely evolved packet core (EPC) to extreme edge network - collapses EPC into single, lightweight, selfcontained entity is co-located with each UAV base-stations. SkyCore incorporates elements are designed address unique challenges facing such distributed design in environment,...

Spectrum management and device coordination for dynamic spectrum access (DSA) networks have received significant research attention. However, current wireless devices yet to fully embrace DSA due the difficulties in realizing spectrum-agile communications. We address practical hurdles present solutions toward implementing devices, answering an important question "what is a simple extension that makes them spectrum-agile?" To this end, we propose RODIN, general per-frame spectrum-shaping...