Abstract: A detection device for communicating with an external device includes a smart antenna, a storage device, and a processor. The smart antenna is capable of switching between a plurality of antenna modes. In each of the antenna modes, the smart antenna transmits a test datum and receives a feedback datum according to the test datum, the processor performs a time reversal algorithm to the feedback datum so as to obtain a time reversal datum, the processor calculates an indicator according to the feedback datum and the time reversal datum, and the storage device stores the feedback datum, the time reversal datum, and the indicator. The processor compares all of the indicators with each other and controls the smart antenna to select the final mode of the antenna modes according to a comparison between all of the indicators.

Abstract: A wireless mesh network topology map management method includes: deploying a main AP and a first AP; establishing a connection between the first AP and the main AP; executing a positioning procedure to obtain a first coordinate of the first AP relative to the main AP; deploying a second AP; establishing a connection between the second AP and one of the main AP and the first AP; executing the positioning procedure to obtain a second coordinate of the second AP relative to the main AP; establishing a wireless mesh network topology map based on the first and second coordinates; and controlling the second AP to establish a connection with one of the main AP and the first AP that has the shortest distance relative to the second AP based on the wireless mesh network topology map.

Abstract: A time-reversal indoor detection system and method are provided. The system includes an anchor node device, an access point (AP) device, and a first electronic device. The first wireless communication circuit of the anchor node device is configured to send a probe signal, a third wireless communication circuit of the access point device is configured to receive the probe signal, a processor is configured to obtain a current CSI from the probe signal, and to compare the current CSI to a preset CSI, and when a first CSI included in the preset CSI is matched to the current CSI, a second wireless communication circuit of the anchor node device is configured to activate at least one function of a first electronic device through a second communication protocol.

Abstract: A structure detection system and method for detecting anomalies associated with the structure are provided. The system includes a first transceiver, a second transceiver, and a processor. In a first TR test, the second transceiver receives a first probing signal sent from the first transceiver and performs a time-reversal (TR) process to generate a first TR signal to be sent to the first transceiver, and a first channel state information (CSI) is obtained in response to the first TR signal. In a second TR test, the first transceiver receives a second probing signal sent from the second transceiver and performs the TR process to generate a second TR signal to be sent to the second transceiver, a second CSI is obtained in response to the second TR signal. The processor compares a combination of the first CSI and the second CSI to a reference CSI for detecting anomalies.

Abstract: Wireless communication system and method having automatic self-configuration mechanism are provided. The method including configuring a first transceiver to perform a wireless network scan process to obtain a channel status report by executing a wireless network scan program, configuring the first transceiver to select one of the plurality of channels with the channel loading lower than a channel loading threshold, configuring the first transceiver to send a sounding signal to a second transceiver through the selected one of the plurality of channels, configuring the second transceiver to obtain channel status information (CSI) associated to the selected channel from the sounding signal; and configuring the second transceiver to determine whether a total data amount of the CSI is larger than a data amount threshold.

Abstract: A structure detection system and method for detecting anomalies associated with the structure are provided. The system includes a first transceiver, a second transceiver, and a processor. In a first TR test, the second transceiver receives a first probing signal sent from the first transceiver and performs a time-reversal (TR) process to generate a first TR signal to be sent to the first transceiver, and a first channel state information (CSI) is obtained in response to the first TR signal. In a second TR test, the first transceiver receives a second probing signal sent from the second transceiver and performs the TR process to generate a second TR signal to be sent to the second transceiver, a second CSI is obtained in response to the second TR signal. The processor compares a combination of the first CSI and the second CSI to a reference CSI for detecting anomalies.

Abstract: A detection device for communicating with an external device includes a smart antenna, a storage device, and a processor. The smart antenna is capable of switching between a plurality of antenna modes. In each of the antenna modes, the smart antenna transmits a test datum and receives a feedback datum according to the test datum, the processor performs a time reversal algorithm to the feedback datum so as to obtain a time reversal datum, the processor calculates an indicator according to the feedback datum and the time reversal datum, and the storage device stores the feedback datum, the time reversal datum, and the indicator. The processor compares all of the indicators with each other and controls the smart antenna to select the final mode of the antenna modes according to a comparison between all of the indicators.

Abstract: A time-reversal indoor detection system and method are provided. The system includes an anchor node device, an access point (AP) device, and a first electronic device. The first wireless communication circuit of the anchor node device is configured to send a probe signal, a third wireless communication circuit of the access point device is configured to receive the probe signal, a processor is configured to obtain a current CSI from the probe signal, and to compare the current CSI to a preset CSI, and when a first CSI included in the preset CSI is matched to the current CSI, a second wireless communication circuit of the anchor node device is configured to activate at least one function of a first electronic device through a second communication protocol.

Abstract: Conduit leakage detection system and method are provided. The system includes a first detection unit, a processor, and a memory. The first detection unit includes a first transceiver and a second transceiver communicates with the first transceiver to detect a conduit. The first transceiver sends a first probe signal toward a first direction, and the second transceiver is configured to receive the first probe signal. The memory stores a first preset channel state information (CSI), and the first preset CSI including a first CSI and a first normal CSI. The processor obtains a first current CSI from the first probe signal by performing a time-reversal process, and compares the first current CSI to the first preset CSI. When the first CSI is matched to the first current CSI, a first conduit leakage event associated with the conduit is determined to be occurred.

Abstract: A radio frequency signal processing method for a wireless communication device, which includes an omni-directional antenna and a plurality of directional antennas, includes receiving a request signal from a first sending node with the omni-directional antenna, sending a confirming signal to the first sending node with the omni-directional antenna, receiving a data signal from the first sending node with a first directional antenna of the plurality of directional antennas according to the request signal and a result of a training packet process, transmitting an acknowledge signal to the first sending node with the first directional antenna, and receiving follow-up signals with the omni-directional antenna. The request signal is utilized to ask the wireless communication device to receive the data signal.

Abstract: A radio-frequency transceiver system adapted to a wireless local area network includes an antenna set, including a plurality of antenna units disposed toward a plurality of directions, a radio-frequency signal processing module for processing radio-frequency signals, and a switching module electrically coupled between the antenna set and the radio-frequency signal processing module for switching between different connection states of the radio-frequency signal processing module and the antenna units of the antenna set such that the radio-frequency transceiver system switches between an omnidirectional mode and a directional mode. In the omnidirectional mode, the antenna units are electrically connected to the radio-frequency signal processing module to transmit or receive radio-frequency signals omni-directionally.

Abstract: A radio frequency signal processing method for a wireless communication device, which includes an omni-directional antenna and a plurality of directional antennas, includes receiving a request signal from a first sending node with the omni-directional antenna, sending a confirming signal to the first sending node with the omni-directional antenna, receiving a data signal from the first sending node with a first directional antenna of the plurality of directional antennas according to the request signal and a result of a training packet process, transmitting an acknowledge signal to the first sending node with the first directional antenna, and receiving follow-up signals with the omni-directional antenna. The request signal is utilized to ask the wireless communication device to receive the data signal.

Abstract: A wireless communication device coupled to a computer includes an antenna for transmitting a transmitted RF signal and receiving a received RF signal, an RF front-end circuit coupled to the antenna, for amplifying and filtering the transmitted RF signal and the received RF signal, and an interface coupled between the computer and the RF front-end circuit. An operating system and protocol stack programs of the wireless communication device are stored in a memory unit of the computer, and are executed on a processing unit of the computer.

Abstract: A point-to-multipoint star configured terrestrial radio communication system having at least one base station transmitting to and receiving RF communication signals from a plurality of associated subscriber stations in the 0.3-300 GigaHertz (GHz) range. The system includes means for reducing frequency uncertainty, drift or error of the RF transmissions from each of the subscriber stations to the base station. Each subscriber station has a low cost local reference oscillator, and the system incorporates a reference broadcast signal of high frequency precision from the base station and at each subscriber station there is means for measuring frequency error and compensating for frequency drift/error in the low-cost oscillator at the subscriber station.

Abstract: The present invention is directed to the use of bandwidth efficient OCDMA in a multipath environment. The high rate PN code greatly attenuates multipath components that are delayed enough to have significant impact on the degree of orthogonality that may be achieved. By offsetting the carriers by the RW chipping rate and using precise network timing to align all accesses to a small fraction of a high rate PN chip duration, it is possible to fully utilize the available bandwidth. The procedure for achieving this time base alignment has been previously disclosed in U.S. patent application Ser. No. 980,957.

Abstract: A local multipoint distribution system having a head end coupled to a plurality of base stations with each base station constituting a cell. Each base station has a plurality of sector beam antennas, each sector beam antenna illuminating a predetermined sector of the cell with RF communication signals. A plurality of RF subscriber stations for each sector of a cell, with each subscriber station having a high gain antenna with a narrow beam width oriented toward the sector beam antenna oriented toward its assigned sector. Time division multiple access control is provided at each subscriber station operated such that each subscriber transmits at a time different from the other subscribers in its sector so that the subscribers in a given sector do not interfere with each others' transmissions, respectively. The power level transmitted by the subscribers are adjusted or controlled so that the subscriber signals arrive at the respective base stations at about the same power level.

Abstract: A frequency control system and method for minimizing frequency drifts in subscriber terminals in a point-to-multipoint system is described enabling the use of low cost oscillators in the Subscriber terminals by measuring the frequency offset of the subscriber terminal's receiver to estimate its oscillator frequency drift which is then used to correct the subscriber terminal's transmitter frequency and also by feedback of a frequency correction from the base station to the subscriber.

Abstract: A wireless OCDMA communication system in which there is a cluster of base stations (BS), or radio fixed parts (RFP), which may in turn be controlled by a wireless cluster controller (WCC). The system uses frames of a time division duplex spread spectrum signal for two-way voice and/or data transmission, and a plurality of handsets, portable parts (PPs), or more complex subscribers, each adapted to communicate with the BS, or RFP, using the communication system, can be used to implement a variety of system configurations and provide a variety of at least two levels of service selected from a wide variety of services.

Abstract: A local multipoint distribution system having a head end coupled to a plurality of base stations with each base station constituting a cell. Each base station has a plurality of sector beam antennas, each sector beam antenna illuminating a predetermined sector of the cell with RF communication signals. A plurality of RF subscriber stations for each sector of a cell, with each subscriber station having a high gain antenna with a narrow beam width oriented toward the sector beam antenna oriented toward its assigned sector. Time division multiple access control is provided at each subscriber station operated such that each subscriber transmits at a time different from the other subscribers in its sector so that the subscribers in a given sector do not interfere with each others' transmissions, respectively. The power level transmitted by the subscribers are adjusted or controlled so that the subscriber signals arrive at the respective base stations at about the same power level.