Showing papers on "Wi-Fi array published in 2012"

Transmission control protocol/internet protocol (tcp/ip) packet-centric wireless point to multi-point (ptmp) transmission system architecture

Abstract: A packet-centric wireless system includes: a wireless base station communicating via a transmission control protocol/internet protocol (TCP/IP) to a first data network; one or more host workstations communicating via TCP/IP to the first data network; one or more subscriber customer premise equipment (CPE) stations coupled with the wireless base station over a shared bandwidth via TCP/IP over a wireless medium; and one or more subscriber workstations coupled via TCP/IP to each of the subscriber CPE stations over a second network. The system can allocate shared bandwidth among the subscriber CPE stations to optimize end-user quality of service (QoS). The first data network includes at least one of: a wireline network; a wireless network; a local area network (LAN); and a wide area network (WAN). The second network includes at least one of: a wireline network; a wireless network; a local area network (LAN); and a wide area network (WAN).

Making sensor networks immortal: an energy-renewal approach with wireless power transfer

Abstract: Wireless sensor networks are constrained by limited battery energy. Thus, finite network lifetime is widely regarded as a fundamental performance bottleneck. Recent breakthrough in the area of wireless power transfer offers the potential of removing this performance bottleneck, i.e., allowing a sensor network to remain operational forever. In this paper, we investigate the operation of a sensor network under this new enabling energy transfer technology. We consider the scenario of a mobile charging vehicle periodically traveling inside the sensor network and charging each sensor node's battery wirelessly. We introduce the concept of renewable energy cycle and offer both necessary and sufficient conditions. We study an optimization problem, with the objective of maximizing the ratio of the wireless charging vehicle (WCV)'s vacation time over the cycle time. For this problem, we prove that the optimal traveling path for the WCV is the shortest Hamiltonian cycle and provide a number of important properties. Subsequently, we develop a near-optimal solution by a piecewise linear approximation technique and prove its performance guarantee.

Mobile computer configured to select wireless communication network

Abstract: A mobile computer can comprise a processor, a memory, and a wireless communication interface. The mobile computer can be configured to periodically monitor one or more network metrics of the currently connected wireless network. In order to maintain an uninterrupted data connection, the mobile computer can be further configured, responsive to determining that at least one pre-defined Quality of Service (QoS) metric of the currently connected network averaged over a pre-defined time period falls outside of an allowable range or at least one pre-defined Quality of Service (QoS) metric of the currently connected network has been outside of an allowable range for at least a pre-defined time period, to select a new wireless network of a plurality of available wireless networks based on at least one network selection criterion and connect to the new wireless network.

Advanced Optical Wireless Communication Systems

Abstract: Optical wireless communications is a dynamic area of research and development. Combining fundamental theory with a broad overview, this book is an ideal reference for anyone working in the field, as well as a valuable guide for self-study. It begins by describing important issues in optical wireless theory, including coding and modulation techniques for optical wireless, wireless optical CDMA communication systems, equalization and Markov chains in cloud channels and optical MIMO systems, as well as explaining key issues in information theory for optical wireless channels. The next section describes unique channels that could be found in optical wireless applications, such as NLOS UV atmospheric scattering channels, underwater communication links and a combination of hybrid RF/optical wireless systems. The final section describes applications of optical wireless technology, such as quantum encryption, visible light communication, IR links and sensor networks, with step-by-step guidelines to help reduce design time and cost.

Mirror mirror on the ceiling: flexible wireless links for data centers

Abstract: Modern data centers are massive, and support a range of distributed applications across potentially hundreds of server racks. As their utilization and bandwidth needs continue to grow, traditional methods of augmenting bandwidth have proven complex and costly in time and resources. Recent measurements show that data center traffic is often limited by congestion loss caused by short traffic bursts. Thus an attractive alternative to adding physical bandwidth is to augment wired links with wireless links in the 60 GHz band.We address two limitations with current 60 GHz wireless proposals. First, 60 GHz wireless links are limited by line-of-sight, and can be blocked by even small obstacles. Second, even beamforming links leak power, and potential interference will severely limit concurrent transmissions in dense data centers. We propose and evaluate a new wireless primitive for data centers, 3D beamforming, where 60 GHz signals bounce off data center ceilings, thus establishing indirect line-of-sight between any two racks in a data center. We build a small 3D beamforming testbed to demonstrate its ability to address both link blockage and link interference, thus improving link range and number of concurrent transmissions in the data center. In addition, we propose a simple link scheduler and use traffic simulations to show that these 3D links significantly expand wireless capacity compared to their 2D counterparts.

Multi-RAT carrier aggregation for integrated WWAN-WLAN operation

Abstract: Systems and methods for Multi-Radio Access Technology (RAT) Carrier Aggregation (MRCA) wireless wide area network (WWAN) assisted wireless local area network (WLAN) flow mapping and flow routing are disclosed. One system comprises a dynamic flow mapping module that is configured to form a flow-mapping table to dynamically map service flows between the WWAN radio and the WLAN radio in the wireless device. A flow routing module is configured to route data packets to one of the WWAN radio and the WLAN radio in the wireless device based on the flow-mapping table to transmit and receive the data packets via the wireless device.

Apparatus and method for transmitting wireless power

Abstract: A method and a wireless power transmitter are provided for transmitting wireless power to at least one wireless power receiver. The method includes setting, by the wireless power transmitter, a search channel to be used for communication with the at least one wireless power receiver; detecting at least one of an energy level and a Received Signal Strength Indication (RSSI) value of a signal received on the search channel; and determining whether to designate the search channel as a communication channel based on the detection results.

Neighbor Discovery Optimization for IPv6 over Low-Power Wireless Personal Area Networks (6LoWPANs)

Abstract: The IETF work in IPv6 over Low-power Wireless Personal Area Network (6LoWPAN) defines 6LoWPANs such as IEEE 802.15.4. This and other similar link technologies have limited or no usage of multicast signaling due to energy conservation. In addition, the wireless network may not strictly follow the traditional concept of IP subnets and IP links. IPv6 Neighbor Discovery was not designed for non- transitive wireless links, as its reliance on the traditional IPv6 link concept and its heavy use of multicast make it inefficient and sometimes impractical in a low-power and lossy network. This document describes simple optimizations to IPv6 Neighbor Discovery, its addressing mechanisms, and duplicate address detection for Low- power Wireless Personal Area Networks and similar networks. The document thus updates RFC 4944 to specify the use of the optimizations defined here. [STANDARDS-TRACK]

Systems and methods for detecting and protecting a wireless power communication device in a wireless power system

Abstract: Embodiments are directed to detecting and limiting power transfer to communication device, such as NFC and RFID cards. A method may include detecting one or more communication devices positioned within a wireless power transfer region of a wireless power transmitter. The method may further include limiting an amount of power transmitted by a transmitter in response to the detection.

Method, apparatus, and computer program product for wireless charging detection

Abstract: Method, apparatus, and computer program product example embodiments provide wireless charging detection. According to an example embodiment of the invention, a method comprises advertising by a wireless charging device, an availability for wireless charging over a wireless communication interface; scanning, by the wireless charging device, for wireless signals from one or more other wireless devices; providing, by the wireless charging device, information usable for characterizing charging capabilities of the wireless charging device; transmitting, by the wireless charging device, one or more wireless communication packets over the wireless communication interface, including the information usable for characterizing the charging capabilities of the wireless charging device, in response to receiving one or more wireless signals from the one or more other wireless devices; and providing, by the wireless charging device, power to the one or more other wireless devices over a wireless power interface.

Method and apparatus for transmitting wireless power

Abstract: A method and apparatus are provided for transmitting wireless power in a wireless power network managed by a wireless power transmitter. The method includes transmitting first charging power to a first wireless power receiver; detecting a second wireless power receiver; and transmitting second charging power to the second wireless power receiver.

Wireless power transmitter and wireless power transfer method thereof in many-to-one communication

Abstract: A wireless power transmitter for transmitting power in a wireless manner by forming a wireless power signal and a wireless power transfer method thereof are capable of optimizing transmission efficiency for a plurality of wireless power receivers, by deciding an optimal transmission parameter (especially, a frequency corresponding to the wireless power signal or a resonant frequency) for the plurality of wireless power receivers based on control errors received from the plurality of wireless power receivers, respectively, via respective time slots allocated to the plurality of wireless power receivers.

Wireless power transfer system and methods

Abstract: Systems and methods pertaining to wireless power transfer are disclosed. In one implementation, a system includes a wireless charger that is used to charge at least one wirelessly chargeable device. The wireless charger includes a master communication system and at least one wireless power charge transmitter, while the wirelessly chargeable device includes a slave wireless communication system configured at least in part, for communicating with the master wireless communication system in order to execute a wireless power charging operation. The wirelessly chargeable device further includes a wireless power charge receiver configured to receive a wireless power charge from the wireless power charge transmitter contained in the wireless charger.

Wireless power transmission system, and method for controlling wireless power transmission and wireless power reception

Abstract: A wireless power transmission system, and a method for controlling wireless power transmission and wireless power reception are provided. According to an aspect, a method for controlling a wireless power transmission may include: detecting a plurality of target devices used to wirelessly receive power; selecting a source resonating unit from among a plurality of source resonating units, based on the amount of power to be transmitted to one or more of the plurality of target devices, a coupling factor associated with one or more of the plurality of target devices, or both; and wirelessly transmitting power to a target device using the selected source resonating unit.

System and Method for Providing Wireless Power Feedback in a Wireless Power Delivery System

Abstract: A wireless power delivery system includes a wireless power source and a control module. The wireless power source provides power to an information handling system. The control module is in communication with the wireless power source, and is configured to detect a presence signal from the information handling system, to set an output power level for the information handling system based on the presence signal, to receive a signal from the information handling system, and to adjust the output power level based on the signal.

Method and system to control ambient RF energy for wireless devices

Abstract: A method and apparatus is disclosed herein for controlling radio-frequency (RF) energy for wireless devices. In one embodiment, the method comprises determining to increase radio-frequency (RF) energy available to power a wireless tag and controlling the RF energy delivered to the wireless tag to provide tag energy, using one or more of: a) increasing transmission RF power of one or more wireless communication devices, b) increasing a duty cycle associated with wireless transmissions of one or more wireless communication devices, and c) decreasing path loss of the power to the wireless tag.

Wireless power transmitter and power transmission method thereof

Abstract: Disclosed are a wireless power transmitter and a power transmission method thereof. The wireless power transmitter includes a plurality of transmission resonance units, a detection power applying unit applying detection power to the transmission resonance units to detect a location of the wireless power receiver, and a current measuring unit measuring current generating from an inner part of the wireless power transmitter based on the applied detection power. The wireless power transmitter transmits the power through at least one transmitting resonance unit corresponding to the location of the wireless power receiver based on the measured current.

RF processing circuit and wireless communication device using the same

Abstract: A radio-frequency (RF) processing circuit used in a wireless communication device is disclosed. The RF processing circuit comprises an RF front-end circuit, coupled to a first antenna, a second antenna, a first wireless communication module and a second wireless communication module, for switching couplings between the first antenna and the second antenna, and the first wireless communication module and the second wireless communication module according to a control signal; and a control unit, for generating the control signal to the RF front-end circuit according to operation frequency bands and operation conditions of the first wireless communication module and the second wireless communication module.

Apparatus and method for sharing energy in wireless device

Abstract: A method and apparatus to share energy in a wireless device are provided. A power sharing method between a wireless device and at least one neighboring wireless device, includes scanning, by the wireless device, the at least one neighboring wireless device. The power sharing method further includes determining to share power with the at least one neighboring wireless device. The power sharing method further includes sharing power with the at least one neighboring wireless device.

Apparatus and method for wireless charging

Abstract: The present disclosure relates to an apparatus and a method for wireless charging. The method includes: receiving a wireless power and performing wireless charging by a wireless power reception apparatus; detecting whether a human body approaches the wireless power reception apparatus during receiving of the wireless power; and when approaching of the human body is detected, interrupting the wireless charging. The method can prevent a human body from being exposed to a magnetic field by interrupting wireless charging when a human body approaches during wireless charging.

System integration supporting completely wireless peripheral applications

Abstract: In accordance with various aspects of the disclosure, a method and apparatus is disclosed that includes features of a host computing device, and a wireless power transmission module and a wireless data transmission module both integrated on a circuit board of the host computing device The host computing device is configured to transmit power and multi-media data to a peripheral device, upon receipt thereof from the wireless power transmission module and the wireless data transmission module, respectively The peripheral device is configured to receive wirelessly power and multi-media data from a host computing device, and provide the received power and multi-media data to a wireless power reception module and a wireless data reception module, respectively, for processing, both modules being integrated on a circuit board of the peripheral device

Apparatus for wireless power transmission using multi antenna and method for controlling the same

Abstract: A wireless power transmission apparatus includes at least one power transmission antenna for transmitting a wireless power signal in a magnetic resonance manner by using a resonant frequency having different bandwidths from each other; a wireless power signal generating module for generating the wireless power signal; at least one wireless power converting module for converting a power level of the wireless power signal generated by the wireless power signal generating module and having different power level conversion ranges corresponding to the bandwidth of the resonant frequency of the power transmission antenna; a multiplexer matching module for selectively connecting the wireless power converting module to a corresponding power transmission antenna; and a control unit for selectively connecting the power transmission antenna and the wireless power converting module according to a required power of a device to be charged to adjust the power level of the wireless power signal.

Power-receiving device, wireless power-feeding system including power-receiving device, and wireless communication system including power-receiving device

Abstract: When a portable electronic appliance is provided with two systems, a wireless power-feeding system and a wireless communication system, each system requires two power-receiving devices, a coil and an antenna, leading to a problem of increased electronic appliance size and cost. Wireless power feeding employs the resonance method and uses a resonance coil using the resonance method and a power-receiving coil that receives power from the resonance coil. At least one of the resonance coil and the power-receiving coil can also be used as an antenna for wireless communication. Thus, a power-receiving device that can be used for two systems, wireless power feeding and wireless communication, can be provided.

Wireless communication accessory for a mobile device

Abstract: A wireless communication accessory for a mobile communication device comprising: a casing that conforms, at least partially, to the outer shape of the mobile communication device; a processing circuit housed within the casing and configured to process a first data; and a wireless transmitter coupled to the processing circuit, where the transmitter is configured to transmit the first data. The wireless communication accessory may further comprise a wireless receiver that is configured to receive a second data from an external wireless device. The first data may be associated with any or all of the following: payment card information for processing purchase transactions; public transportation account information for processing travel credits on public transportation systems; and access card information for gaining access into restricted areas.

Mobile wifi arrangement

Abstract: A system for enabling wireless near-field hot-spot communication between a wide variety of wireless ground-position-indicating personal communication devices being utilized within a zone and a further communication network outside of the zone.

Medical devices with proximity detection

Abstract: A wireless medical device is disclosed. The wireless medical device comprises a processor, a memory, a sensor for detecting a physiological signal, a radio and a proximity detector to measure a distance of the wireless medical device relative to a second wireless medical device. The proximity detector includes a ranging functionality. A wireless communication channel is created when a distance between the wireless medical device and the second wireless medical device is within a first predetermined threshold. The distance is greater than zero.

On renewable sensor networks with wireless energy transfer: The multi-node case

Abstract: Wireless energy transfer based on magnetic resonant coupling is a promising technology to replenish energy to sensor nodes in a wireless sensor network (WSN). However, charging sensor node one at a time poses a serious scalability problem. Recent advances in magnetic resonant coupling shows that multiple nodes can be charged at the same time. In this paper, we exploit this multi-node wireless energy transfer technology to address energy issue in a WSN. We consider a wireless charging vehicle (WCV) periodically traveling inside a WSN and charging sensor nodes wirelessly. We propose a cellular structure that partitions the two-dimensional plane into adjacent hexagonal cells. The WCV visits these cells and charge sensor nodes from the center of a cell. We pursue a formal optimization framework by jointly optimizing traveling path, flow routing and charging time. By employing discretization and a novel Reformulation-Linearization Technique (RLT), we develop a provably near-optimal solution for any desired level of accuracy.