Abstract:
PROBLEM TO BE SOLVED: To calibrate a misconfigured wireless access point.SOLUTION: One method includes the steps of: receiving a position of a mobile station and wireless signal model measurements derived from packets exchanged between the mobile station and a plurality of wireless access points; receiving positions and/or identities of the plurality of wireless access points used in determining the position of the mobile station; comparing the position of the mobile station with the wireless signal model measurements; and identifying a misconfigured wireless access point on the basis of the comparing. Another method includes the steps of: receiving positions associated with a plurality of wireless access points; determining a position of a mobile station on the basis of a wireless signal model; comparing the position of the mobile station and the wireless signal model with the positions associated with the plurality of wireless access points; and determining whether at least one wireless access point is misconfigured.
Abstract:
PROBLEM TO BE SOLVED: To provide a system and method for retrieving a local map for a given area.SOLUTION: The subject matter disclosed herein relates to a system and method for retrieving a local map for a given area. One or more signals wirelessly transmitted from one or more wireless network elements may be received by a mobile device. The mobile device may identify an associated local map on the basis at least partly of the received one or more signals. The associated local map and annotations associated with the associated local map may subsequently be obtained. The associated local map utilizes a predefined coordinate system.
Abstract:
PROBLEM TO BE SOLVED: To provide improved position determination methods and devices used by wireless mobile devices in a wireless communication system.SOLUTION: One method for wirelessly determining a position of a mobile station includes measuring a round trip time (RTT) to a plurality of wireless access points, estimating a first distance to each wireless access point on the basis of a round trip time delay and an initial processing time associated with each wireless access point, estimating a second distance to each wireless access point on the basis of supplemental information, combining the first and second distance estimates to each wireless access point, and calculating the position on the basis of the combined distance estimates.
Abstract:
PROBLEM TO BE SOLVED: To implement various models, alone or in combination, that exploit wireless signal properties (e.g., RTT, signal strength, etc.) which can improve position determination while avoiding costly pre-deployment efforts and/or changes to the network infrastructure.SOLUTION: One method for wirelessly determining a position of a mobile station includes measuring a round trip time (RTT) to a plurality of wireless access points, estimating a first distance to each wireless access point on the basis of the round trip time delay and an initial processing time which are associated with each wireless access point, estimating a second distance to each wireless access point on the basis of supplemental information, combining the first and second distance estimates to each wireless access point, and calculating the position on the basis of the combined distance estimates.
Abstract:
PROBLEM TO BE SOLVED: To provide a device for round trip time measurements.SOLUTION: An appliance facilitates localization of a station (STA) in a network, for example, a short-range wireless network. An automatic response to a request for a measurement related communication is provided. The appliance can include a radio frequency (RF) interface and a media access control (MAC) section. The MAC section can receive the request and generate the automatic response immediately after a uniform period that is uniform among any such appliance within the network. The appliance performs only the generation of the automatic response, though the response can include additional information such as (x, y) coordinates of the appliance.
Abstract:
PROBLEM TO BE SOLVED: To provide a system and method for power control and scheduling of sub-carriers in an OFDM communication system.SOLUTION: A receiver dynamic range can be minimized by a power control loop that attempts to maintain received power over a noise floor in a predetermined range. If the received power relative to the noise floor in allocated sub-carriers exceeds the predetermined range and the total received power is at a minimum, a scheduling system allocates an additional sub-carrier to a communication link. Additionally, if the received power relative to the noise floor is less than the predetermined range minimum and the total received power is at a maximum, the scheduling system de-allocates the sub-carrier from the communication link. The scheduling system may also adjust an encoding rate to maintain a relatively constant symbol rate in each of the sub-carriers.
Abstract:
PROBLEM TO BE SOLVED: To provide a pilot symbol pattern for a pilot symbol transmitted from a mobile station or a base station.SOLUTION: The wireless communication apparatus comprises: at least one antenna; a memory that stores at least one time selective pilot pattern designed for a time selective channel and at least one frequency selective pilot pattern designed for a frequency selective channel; and a processor coupled with the at least one antenna and the memory, the processor selecting one pilot pattern of the at least one time selective pilot pattern and the at least one frequency selective pilot pattern, and setting pilot symbols of the selected pilot pattern to locations close to the edges of the hop region in accordance with a first order term of a communication channel.
Abstract:
diversidade de retardo cíclico variante no tempo de ofdm são providos métodos e equipamentos que aplicam um retardo variante com o tempo a símbolos a serem transmitidos a partir de uma ou mais antenas