Abstract: A method and receiver for determination of angle of arrival in one or two planes of a beam received at an antenna array comprising at least two pairs of antenna elements are provided. In some embodiments, a method includes computing a pair of difference signals, each difference signal being computed from signals from a different one of the at least two pairs of antenna elements. The method further includes determining a directional angle of arrival of the beam in one plane based on the pair of difference signals.

Abstract: A method and receiver are disclosed for the blind detection and synchronization of data packets are disclosed. According to one aspect, a method includes generating a running histogram of received sample values for each of a plurality of frequency bins and symbol timing phases, the running histogram spanning a most recent block of symbols representing a candidate synchronization (sync) word. The method also includes, for each symbol interval: analyzing the histogram to estimate symbol timing phase, DC offset and frequency offset. The method also includes determining a first candidate sync word based at least in part on the symbol timing phase, frequency offset and corresponding DC offset the first candidate sync word representing a most recent vector of bits associated with the first candidate sync word. The method further includes discerning a lower address part (LAP) obtained from the first candidate sync word to enable detection of a packet.

Abstract: A method is disclosed that relates to estimating the temporal location of mobile ground based Wi-Fi stations by monitoring a multitude of ground based access points, using an airborne Wi-Fi monitoring device. The airborne monitoring station first identifies and locates ground based access points within the area of interest. The airborne monitoring station monitors the transmission of the ground based stations and access points in the said networks, in particular the probe response management frames, recording the access point and station addresses and the time of reception. The transmissions contain an address of a corresponding ground-based access point and the address of the ground-based mobile station. The airborne monitoring station then matches all the times of the probe responses corresponding to the each station address and together with the location of the access points computes the likely temporal track for each station.

Abstract: Methods are disclosed that improve the location of a ground based Wi-Fi device using an airborne Wi-Fi station. One embodiments of the disclosure describes the periodic transmission of bursts of RTS packets in order to reduce interference to the responding CTS packets. Another embodiment of the disclosure describes the use of specific values used in the RTS Duration fields that enable the responding CTS packet to be identified and linked to the RTS packet to which it is responding. A further embodiment of the disclosure describes the use of a packet transmitted at the end of each burst that resets the NAV times for all ground networks.

Abstract: A method and device are disclosed that enable communication between an airborne STA and a ground based AP in the presence of a multitude of other ground based networks that would normally cause such interference that communication would not be possible. A succession of control packets are sent prior to an air to ground communication such that the ground based networks delay their traffic allowing the wanted acknowledgment packet to be received. A succession of control packets are sent followed by a PS poll or data null packet prior to a ground to air communication such that the wanted ground to air packet is sent at a known time and the other ground based networks delay their traffic allowing the wanted ground to air packet to be received.

Abstract: A method and wireless communication device for estimating wireless signal strength value of a wireless signal transmission for an unpopulated cell in an array corresponding to a geographic area. The method includes populating at least one cell along a route within the array with a corresponding received wireless signal strength value, selecting a number of populated cells within a predetermined distance of the unpopulated cell, identifying one of the number of populated cells within a predetermined distance of the unpopulated cell, determining a maximum wireless signal strength value from among the received wireless signal strength values, estimating a first wireless signal strength value for the unpopulated cell based at least on a wireless strength value for the identified one of the number of populated cells and the maximum wireless signal strength value, and storing the first estimated wireless signal strength value.

Abstract: A method and a node identification system for identifying at least one unknown mobile node in a communications network using details related to at least one known mobile node and organization of the details related to the at least one known mobile node. The method includes capturing details related to the at least one unknown mobile node and identifying an organization of the captured details related to the at least one unknown mobile node, comparing the details related to the at least one known mobile node and the organization of the details related to the at least one known mobile node with the captured details related to the at least one unknown mobile node and the organization of the captured details related to the at least one unknown mobile node, and determining a type of the at least one unknown mobile node based on the comparing.

Abstract: A method and a node identification system for identifying at least one unknown access point in a communications network using details related to at least one known access point and organization of the details related to the at least one known access point. The method includes capturing details related to the at least one unknown access point and identifying an organization of the captured details related to the at least one unknown access point, comparing the details related to the at least one known access point and the organization of the details related to the at least one known access point with the captured details related to the at least one unknown access point and the organization of the captured details related to the at least one unknown access point, and determining a type of the at least one unknown access point based on the comparing.

Abstract: A method and monitoring station are disclosed that enable efficient communications between a monitoring station and a wireless device. The method includes determining that receipt of a first data packet by the monitoring station from the wireless device has been received without error, receiving a subsequent data packet at the monitoring station from the wireless device, determining that the subsequent data packet being received from the wireless device is a retransmission of the first data packet, and transmitting a first acknowledgement to the wireless device before the subsequent data packet is received in its entirety. A propagation delay may be estimated and used to adjust certain parameters of the monitoring station so as to account for excessive delays that are beyond the delays anticipated by and accommodated within the IEEE802.11 Standard.

Abstract: A passive geo-location scheme of Wi-Fi access points is described using one or more mobile measuring stations. The methods and arrangements herein relate to, in one embodiment, using the TSF timer in beacons received by the measuring station, the reported TODs, the TOAs measured by the measuring station and synchronization between the timers of the wireless device and the measuring station. The synchronization includes applying a factor ? for correcting the timer associated with the measuring station when the measuring station receives the beacons, applying a factor ? for correcting a ratio of timer rates between the timer associated with the wireless device and the timer associated with the measuring station, and applying a factor ? for correcting changes in a timer rate ratio between the first timer associated with the wireless device and the timer associated with the measuring station.

Abstract: A monitoring station and method for increasing a frequency of wireless packet reception. The monitoring station includes a physical layer (PHY) having a plurality of radio frequency (RF) receivers, processing circuitry comprising a processor, and a memory storing instructions that, when executed, configure the processor to control timing offsets of each of the plurality of RF receivers such that each of the plurality of RF receivers has a different timing offset with respect to each other. The monitoring station includes an RF signal router configured to receive an incoming RF signal and route the RF signal to the plurality of RF receivers, and vary at least one of signal gain and signal loss for the incoming RF signal across each of the plurality of RF receivers such that each of the plurality of RF receivers has a different effective noise figure with respect to each other.

Abstract: A method and wireless communication device for tracking frequencies of transmitted burst signals. The method includes receiving a burst signal, determining a quality of the burst signal and a carrier frequency of the burst signal, demodulating the burst signal based upon the determined carrier frequency, determining a frequency offset of the burst signal based on the determined carrier frequency, and when the quality of the burst signal exceeds a threshold, calculating a drift window based on the determined frequency offset.

Abstract: An assisted passive geo-location method and system for determining the location of a wireless device. The method includes passive location techniques in order to assist in determining the location of the wireless device and active techniques in order to assist in the calculation of the relative drift between the clock associated with the wireless device and the clock associated with the measuring station.

Abstract: A method and a node identification system for identifying at least one unknown mobile node in a communications network using details related to at least one known mobile node and organization of the details related to the at least one known mobile node. The method includes capturing details related to the at least one unknown mobile node and identifying an organization of the captured details related to the at least one unknown mobile node, comparing the details related to the at least one known mobile node and the organization of the details related to the at least one known mobile node with the captured details related to the at least one unknown mobile node and the organization of the captured details related to the at least one unknown mobile node, and determining a type of the at least one unknown mobile node based on the comparing.

Abstract: A passive geo-location method for determining the location of a wireless device. The method includes receiving, by a measuring receiver at a first position, a first beacon transmitted to the measuring receiver by the wireless device, and receiving, by the measuring receiver at a second position, a second beacon transmitted to the measuring receiver by the wireless device. When the first position differs from the second position by less than a predetermined distance, the method further includes determining a relative drift between a clock associated with the wireless device and a clock associated with the measuring receiver, and determining a location of the wireless device based at least on the determined relative drift.

Abstract: Disclosed is a method and apparatus for detecting an excitation position of an SRM by comparison of detected currents. The method includes detecting a current by applying a first test voltage to each phase of the SRM, detecting a current by applying a second test voltage to each phase, determining an operation state of the SRM based on a deviation between the currents detected in any one of the phases, determining the operation state of the SRM as a rotation state if the deviation value exceeds a predetermined value, and applying a third test voltage to a phase excited just prior to a current excited phase to detect the current and turning on a phase to be next excited if the detected current value is more than a first reference value, and turning off the phase excited just prior to the presently excited phase if the detected current value is more than a second reference value. The phase excitation position is accurately detected according to the rotating speed without using a position sensor.