358 results about "Radio jamming" patented technology

The present invention provides a wireless communication system that prevents radio interference between a wireless access point and a wireless device, even where the wireless access point cannot recognize the existence of the wireless device to be an interference source that causes radio interference with a radio wave from the wireless access point with which a wireless station is associated. The wireless communication system is formed with the wireless access point and the wireless station that is associated with the wireless access point and performs wireless communications. The wireless station detects a wireless device (a neighbor wireless access point) to be an interference source that causes radio interference with a radio wave from the associated wireless access point. The wireless station transmits a control signal for preventing radio interference to the wireless device to be an interference source. Upon receipt of the control signal from the wireless station, the wireless device to be an interference source performs a control operation so as to prevent radio interference.

An apparatus, method and computer program product comprise controlling cellular network based communication in a primary cell on a frequency band related to the cellular network and by using an uplink and downlink configuration specific to the primary cell; controlling communication in a secondary cell on a frequency band related to a television white space channel and by using an uplink and downlink configuration specific to the secondary cell; measuring radio interference on a temporarily set uplink related carrier on the secondary cell based on information on the temporarily set uplink related carrier received on a downlink related carrier on the primary cell; and reporting results of radio interference measurement via the primary cell.

A radio interference detection and screening system for performs on-locomotive testing of Locomotive Control Unit (LCU) radios. To eliminate bit errors during LCU sensitivity testing (also known as Bit Error Rate (BER) testing), the system detects interfering transmission signals which may cause bit errors in the transmission of test data, and suspends the LCU sensitivity performance testing during periods of detected external transmissions. Once the interfering transmissions are no longer detected by the system, the LCU then resumes the LCU sensitivity performance testing.

A wireless sensor and control system includes wireless RF transmitter units and one or more receivers that communicate using more than one narrowband radio channel to provide increased reliability in the presence of unintentional radio interference. The output of a sensor transducer or closure of a switch contact can trigger transmissions at two or more narrowband carrier frequencies that are subsequently decoded by the receiver(s). The remote sensor data can then be passed to another system for processing and/or utilized to control remote devices. In accordance with one practical embodiment, the remote sensor data indicates the ingress or egress of monitored product inventory.

Methods and apparatus are provided for detecting interference between spectrally distinct wireless communication networks. A first base station in a first network communicates with a first mobile device at a first frequency, and a second base station communicates at a second frequency with a second mobile device geographically co-located with the first mobile device. The power level of an interfering signal received at the first base station from the second mobile device may be estimated by sharing information between the two networks through an interoperability gateway. The path loss of a reference signal transmitted from the first mobile device to its base station is communicated to the gateway, along with a parameter associated with the transmit power level of the interfering signal. Based on this parameter and the reference signal path loss, the received power level of the interfering signal may be inferred.

A network stack includes a packet loss analyzer that distinguishes between packet losses due to congestion and due to lossyness of network connections. The loss analyzer observes the packet loss patterns for comparison with a packet loss model. The packet loss model may be based on a Forward Error Correction (FEC) system. The loss analyzer determines if lost packets could have been recovered by a receiving network device, if FEC had been used. If the lost packets could have been corrected by FEC, the loss analyzer assumes that no network congestion exists and that the packet loss comes from the lossy aspects of the network, such as radio interference for wireless networks. If the loss analyzer determines that some of the lost packet could not have been recovered by the receiving network device, the loss analyzer assumes that network congestion causes these packet losses and reduces the data rate.

The invention discloses a radio system for preventing cheating on exams, which belongs to the fields of radio spectrum monitoring and radio interference. The system comprises radio monitoring equipment and signal interference equipment, wherein the radio monitoring equipment and the signal interference equipment are split; the radio monitoring equipment is connected with at least one piece of signal interference equipment, and transmits information such as signal frequency and the like to the signal interference equipment after detecting a cheating signal; and the signal interference equipment transmits a corresponding interference signal. The system adopts a discovery way so as not to cause interference to normal communication signals in an examination room like an interference suppression method; one piece of radio monitoring equipment can correspond to a plurality of pieces of signal interference equipment to realize full spectrum band interference to the signals; and cheating information is stored in a database so as to achieve the technical effect of high pertinence.

Channel reservation systems and methods are disclosed herein, which schedule transmissions on a shared radio medium that is shared by a plurality of licensed network operators. In embodiments, priority access is pre-assigned to the network and the method determines whether to send a transmission based at least on the transmitter's priority class as compared to another transmitter's priority class and to which transmitter the time slot of a signal is dedicated. In embodiments, priority access may not be preassigned to the network and pre-grants may be used in conjunction with CR-Ts and CR-Rs to determine whether a transmitter transmits.

An actuating drive with an electric motor that has a metallic electric motor housing, a shaft, an armature, collector, brushes, and a brush holder plate, and control electronics. Electronic and electric components are connected to a printed circuit board and the printed circuit board protrudes at right angles to the shaft and into a cross section of the electric motor housing. Outside the electric motor housing, the electronic and electric components are protected by a control electronics housing. Radio interference suppression means, for example, can be disposed inside the actuating drive. The system includes a printed circuit board with a strip conductor and a contact spring that leads from the strip conductor and this contact spring protrudes into the electric motor housing, wherein a resilient free end of the spring rests against the electric motor housing producing an electrical contact.

A method and apparatus is provided for use in a time domain isolated apparatus in which the operation of various radio-interfering circuits can be altered or controlled to mitigate levels of interference to the radio to acceptable levels based on current or predicted link requirements. Techniques are provided that allow some use of signal processing and other digital circuitry while the RF circuitry is operating.

A wireless communication which suppresses radio interference between wireless base stations and improves the channel efficiency is implemented. In the wireless communication system including a central base station, a plurality of remote base stations having a direction-variable antenna, and a plurality of mobile stations to communicate with the remote base stations, the central base station performs centralized management of radio-wave beam patterns to be sent to the plurality of mobile stations which will communicate with remote base stations and performs packet scheduling of the mobile stations in such a manner that radio waves sent from the remote base stations will not cause strong interference at the mobile stations.

A circularly polarized antenna has a dielectric substrate, a ground conductor which is piled up one surface side of the dielectric substrate, a circularly polarized type of antenna element formed on an opposite surface of the dielectric substrate, a plurality of metal posts whose respective one end sides are connected to the ground conductor and penetrate the dielectric substrate along a thickness direction thereof, and whose respective other sides extend up to the opposite surface of the dielectric substrate, the plurality of metal posts configuring a cavity by being provided at predetermined intervals so as to surround the antenna element, and a conducting rim which short-circuits the respective other end sides of the plurality of metal posts along an array direction thereof, and is provided so as to extend by a predetermined distance in a direction of the antenna element at the side of the opposite surface of the dielectric substrate. With the circularly polarized antenna, a radiation characteristic of the antenna can be made to be a desired characteristic by preventing a surface wave from being generated by means of the cavity and the conducting rim, and a frequency characteristic of the antenna gain can be made to have a sharp notch within the RR prohibited band by utilizing a resonance of the cavity. Accordingly, the circularly polarized antenna is effective for reducing radio interference with the EESS or radio astronomical services.

A radio interference suppression circuit used in a radio circuit of performing duplex transmission, comprises a first directional coupler of receiving a transmission frequency signal and then bifurcating and outputting the signal; and a second directional coupler which acquires, through one input thereof, a signal outputted from a reception filter of an antenna multiplexer and containing a reception frequency signal and the leakage signal component of a transmission frequency signal, and acquires, through the other input thereof, the transmission frequency signal outputted from one output of the first directional coupler, and which combines and outputs these acquired signals; wherein the leakage signal component of the transmission frequency signal contained in the signal inputted through the one input of the second directional coupler and the transmission frequency signal inputted through the other input of the second directional coupler are adjusted to be substantially of equal amplitude and reversed phase.

A method for reducing interference between a first frequency-hopping radio communications network and a second frequency-hopping radio communications network, comprising: predicting a possible collision between a transmission at a first frequency in the first frequency-hopping radio communication network and a transmission at the first frequency in the second frequency-hopping radio communication network; and controlling transmission in one of the first frequency-hopping radio communications network and the second frequency-hopping radio communications network to avoid the collision. Also described is a method for controlling the operation of a Master transceiver of a first frequency-hopping radio communications network, comprising: determining the duration for which transmissions at a single frequency can occur in the first frequency-hopping network without a potential collision with transmissions at that frequency in neighboring frequency-hopping networks; and controlling multi-slot communication in the first frequency-hopping radio communications network in dependence upon the determination.

The invention discloses an anti-LSS-aircraft defensive system which comprises a command and control system, a target detection device, a laser damage device, a radio interference device, a catching net launch unmanned aerial vehicle and a net gun. The command and control system is in communication connection with the target detection device, the laser damage device, the radio interference device, the catching net launch unmanned aerial vehicle and the net gun. According to the anti-LSS-aircraft defensive system, signals can be processed to generate intelligence, and then situation awareness display is conducted for providing aid decision making; the laser damage device, the radio interference device, the catching net launch unmanned aerial vehicle and the net gun and other firing units are commanded and controlled to operate through the command and control system, the multi-batch multi-target processing capacity is achieved, and a modular design concept is adopted for the command and control system, so that compatibility of multiple detection means and processing means is achieved; and the utilization rate of weapons can be increased, the effectiveness of the processing means and the environmental suitability of the system can be improved, and diversification demands of anti-LSS-aircraft tactical application can be met.

A method of controlling an operation of a mobile base station that is linked to a mobile communication system via a wireless relay channel includes an information acquiring step of acquiring estimation-purpose base information for estimating a condition of radio interference between the mobile base station and one or more other base stations, the acquisition of the estimation-purpose base information being made by the mobile base station and involving measurement of a physical property responsive to a current position of the mobile base station, an estimation step of estimating the condition of radio interference based on the acquired estimation-purpose base information, and a control step of controlling an operation of the mobile base station based on the estimated condition of radio interference.

The invention relates to a method for ensuring radio interference of a transmission line in different environment and climate conditions, which comprises the following steps of: obtaining change rules of radio interference in different temperatures, humidity and altitude heights and environmental climates of raining, snowing and the like through transmission line actual measurement and a corona cage test of the high-altitude transmission line; then, calculating the radio interference of the line by adopting a given radio interference calculation formula through modeling actual lines and comparing with the actual measurement situation, obtaining the differences between measuring values and actual measurement values of different environmental climates, and modifying the given radio interference calculation formula to obtain the radio interference predication formula in different environmental climates, so as to obtain the ensured value of the radio inference of the transmission line.

Individual radio sets 12a-12e constituting an onboard radio communication system operate together with an adjacent vehicle detection unit (ultrasonic sensors 13a-13e) for detecting a second vehicle adjacent to a first vehicle 11. When it detects the adjacent vehicle, a radio interference decision unit constituting the radio sets 12a-12e decides radio interference due to an onboard radio communication system with the same radio scheme. When it detects the radio interference, a frequency channel switching unit constituting the radio sets 12a-12e switches the frequency channel to be used to avoid the interference of the radio waves.

The invention discloses a machine vision-based unmanned aerial vehicle automatic detection method and an unmanned aerial vehicle control method. According to the machine vision-based unmanned aerial vehicle automatic detection method and the unmanned aerial vehicle control method, an image acquisition device is utilized to automatically inspect the sky; adaption to the change of illumination is realized, and the direct irradiation of strong light is avoided; an image sequence of an area to be detected is obtained; a low-altitude aircraft such as an unmanned aerial vehicle is detected automatically according to target motion characteristics of images in the sequence and the difference of a target and background in each image; and the satellite positioning channel and remote control channel of the unmanned aerial vehicle are subjected to radio interference, so that control on the unmanned aerial vehicle can be realized. With the method of the invention adopted, a whole space domain can be monitored; the orientation of an optical imaging sensor can be automatically adjusted, so that the optical imaging sensor will not be exposed to the direct irradiation of strong light; and environmental background can be automatically learned in real time; and a target can be detected and captured. The method has strong adaptability to the environment and has outstanding economic and practical values.