Abstract: A radio transceiver that includes a multi-channel receiver, a multi-channel transmitter and a controller is disclosed. The multi-channel receiver can be configured to concurrently receive first data frames, each including: (a) first data slots that are received over a first frequency channel that is variable between the first data slots, and (b) an error correction code (ECC). Concurrently, the multi-channel transmitter can be configured to transmit second data frames, each including second data slots that are transmitted over a second frequency channel that is variable between the second data slots, the first frequency channel and the second frequency channel being within a common frequency band. The controller can be configured to use the ECC of a respective first data frame of the first data frames to correct self-interference-based errors in the respective first data frame resulting from the transmission of one or more of the second data frames.

Abstract: A radio transceiver that includes a multi-channel receiver, a multi-channel transmitter and a controller is disclosed. The multi-channel receiver can be configured to concurrently receive first data frames, each including: (a) first data slots that are received over a first frequency channel that is variable between the first data slots, and (b) an error correction code (ECC). Concurrently, the multi-channel transmitter can be configured to transmit second data frames, each including second data slots that are transmitted over a second frequency channel that is variable between the second data slots, the first frequency channel and the second frequency channel being within a common frequency band. The controller can be configured to use the ECC of a respective first data frame of the first data frames to correct self-interference-based errors in the respective first data frame resulting from the transmission of one or more of the second data frames.

Abstract: An indoor location system for locating a mobile device has at least one mobile device configured to be a radio frequency receiver or beacon signal transmitter, and a set of radio frequency units configured to be positioned in a plurality of rooms in a building. One or more of the radio frequency units is located in each room, and each unit is configured to emit or receive radio frequency beacon signals. The mobile device, or each radio frequency unit, is configured to determine a received signal strength (RSS) of each of the received beacon signals. The mobile device, or a computer module connected to the radio frequency units, is configured to calculate from the RSS a room-representative RSS for each room, and to determine which room the mobile device is located in, by selecting the room having the highest value of calculated room-representative RSS.

Abstract: Systems, devices, methods, and computer-readable mediums for generating a radio map of an area are disclosed. In one aspect, the device, method, and computer-readable medium perform processes that may include receiving in at least one processor first information associated with at least one wireless device at a first location in the area. The processes may include receiving in the at least one processor second information associated with at least one wireless device at a second location in the area and different from the first location. The first location within said area and the second location within the area are unknown to the at least one processor. The processes may also include generating a radio map of the area using the first information and the second information.

Abstract: Systems, devices, methods, and computer-readable mediums for generating a radio map of an area are disclosed. In one aspect, the device, method, and computer-readable medium perform processes that may include receiving in at least one processor first information associated with at least one wireless device at a first location in the area. The processes may include receiving in the at least one processor second information associated with at least one wireless device at a second location in the area and different from the first location. The first location within said area and the second location within the area are unknown to the at least one processor. The processes may also include generating a radio map of the area using the first information and the second information.

Abstract: A wireless local area network (WLAN) radio-frequency identification (RFID) tag system provides location finding in a wireless local area network (WLAN), using a WLAN channel. Interference with the WLAN is prevented by either using a sniffer circuit to determine that no network transmission is in progress, using a modified coding sequence or preamble to cause standard WLAN receivers to ignore the RFID tag transmissions, or transmitting a message using a standard WLAN signal addressed to an address not corresponding to a unit within the WLAN. Location units (LUs) and a master unit (MU) within the WLAN receive the RFID tag transmissions and can determine the location of a tag by triangulation based on differences between the signals received at the location units from the tag. The master unit receives the signal information from the location units and computes the location of the tag. Time-difference-of-Arrival (TDOA), received signal strength indication (RSSI) or other triangulation techniques may be used.

Abstract: A method and system for location finding in a wireless local area network (LAN) enables enhanced security via network intrusion management and connection access management, as well as providing a mechanism for physically mapping a wireless network. Multiple receivers are employed to determine time-difference-of-arrival (TDOA) of signals transmitted from a wireless device. The location of the transmitting device is determined by triangulating between multiple receivers. The receivers may be devices within the wireless network that have been enhanced to include TDOA capability, or multiple dedicated location units may be employed within the wireless network or a wired network that may be a completely separate infrastructure depending on the requirements of a particular installation.

Abstract: A wireless local area network (WLAN) radio-frequency identification (RFID) tag system provides location finding in a wireless local area network (WLAN), using a WLAN channel. Interference with the WLAN is prevented by either using a sniffer circuit to determine that no network transmission is in progress, using a modified coding sequence or preamble to cause standard WLAN receivers to ignore the RFID tag transmissions, or transmitting a message using a standard WLAN signal addressed to an address not corresponding to a unit within the WLAN. Location units (LUs) and a master unit (MU) within the WLAN receive the RFID tag transmissions and can determine the location of a tag by triangulation based on differences between the signals received at the location units from the tag. The master unit receives the signal information from the location units and computes the location of the tag. Time-difference-of-Arrival (TDOA), received signal strength indication (RSSI) or other triangulation techniques may be used.

Abstract: A portable receiving/transmitting unit is adapted to communicate with a master station, the master station being associated with a plurality of base stations, a plurality of pagers and a plurality of individual receiving/transmitting units. The portable receiving/transmitting unit includes, integrated into one unit, structure for receiving a data string encoding a personal message which is broadcasted by the master station together with a unit identifying code through a plurality of pagers; structure for conveying the broadcasted message to the operator of the receiving unit identified by the identifying code; and structure for generating a message and for transmitting it from the portable unit to the receiving base stations together with a unit identifying code.