Abstract: A communication system for a hypersonic vehicle uses a distributed antenna system, an impedance matching circuit that provides impedance matching between a transmitter and/or receiver and the selected one or more antennas of the distributed antennas system and a surrounding plasma sheath, near-field probes to determine impedance of the plasma sheath adjacent to each of the probes and thus predict behavior of the respective antennas near the probes, and a control system that selectively connects a transmitter and/or receiver to one or more of the antennas based upon the antennas that are seeing the most favorable transmission or reception characteristics and controlling the impedance matching is to provide impedance matching for the selected antennas.

Abstract: A method for selecting antenna elements at a base station can include selecting multiple transmit antenna elements from several antenna elements according to a work mode of the base station. The work mode can be an open-loop or a closed-loop working mode. In open-loop mode the base station does not receive feedback information regarding channel quality from a mobile station. In closed-loop mode feedback information is received. For example, for control signaling, or when the speed of a mobile station is very high, the base station may determine that the working mode is open-loop. When the information being transmitted is data for a specific mobile station and the mobile station is moving at a speed under a threshold, the base station may select or determine the working mode to be the closed-loop working mode. Antenna elements are selected, for example, according to a spatial correlation appropriate to the work mode.

Abstract: Methods, systems, and computer-readable media for mitigating a temporary interference condition are provided. The temporary interference condition is predicted between a first cellular device and a second cellular device prior to an occurrence of the temporary interference condition. A mitigation action for mitigating the temporary interference condition is identified. A schedule and a scale or scaling for the mitigation action are determined. The mitigation action is implemented in accordance with the schedule and the scale or scaling to mitigate the temporary interference condition during the occurrence of the temporary interference condition.

Abstract: A plurality of modules interact to form an adaptive network in which each module transmits and receives data signals indicative of proximity of objects. A central computer accumulates the data produced or received and relayed by each module for analyzing proximity responses to transmit through the adaptive network control signals to a selectively-addressed module to respond to computer analyzes of the data accumulated from modules forming the adaptive network. Interactions of local processors in modules that sense an intrusion determine the location and path of movements of the intruding object and control cameras in the modules to retrieve video images of the intruding object. Multiple operational frequencies in adaptive networks permit expansions by additional networks that each operate at separate radio frequencies to avoid overlapping interaction. Additional modules may be introduced into operating networks without knowing the operating frequency at the time of introduction.

Abstract: Techniques to control an optical receiver having a control loop using Bit Error Rate (BER). In one implementation, a bit error rate (BER) associated with a received optical signal is determined. Indication of the BER to a control loop adapted is provided to adjust the optical signal in a manner tending to reduce the BER. The received optical signal is adapted in a manner tending to increase the BER such that the control loop operates within an active control region.

Abstract: Water measurement auto-networks and methods of operation are disclosed herein. An exemplary method may include determining a water level at a first water measurement station in an auto-network. The method may also include reducing power to at least a transmitter at the first water measurement station to conserve battery power during an inactive state. The method may further include increasing power to the transmitter only at predetermined times to communicate the water measurement data to a second water measurement station in the auto-network.

Abstract: In a differential global positioning system that includes one or more base stations and rover units, a system and method for including a radio modem transceiver in the rover units, and packaging several components, including the transceiver and a radio antenna in a single package, and possibly including re-chargeable batteries, a GPS receiver, and a GPS antenna in the package, to reduce the number of external electrical connections. Several of the components may be packaged into a survey range pole. GPS satellite correction information is transmitted from a base station in response to a request transmitted from the rover unit by means of the radio modem transceiver. Automatic channel selection is performed by the base stations to select a channel having low communication traffic. The rover units scan the available channels for valid GPS correction information and, in the event that more than one such channel is located, select the channel with the strongest signal.

Abstract: A method and apparatus for measuring the characteristics of radio frequency energy in an industrial radio frequency processing system at a plurality of frequencies is disclosed. The method and apparatus measures the characteristics of radio energy using one detector.

Abstract: A system and method of identifying the source of uplink and downlink interference in a disturbed cell of a wireless telecommunications network. Initially, call events occurring in offending cells are recorded. In conjunction, the disturbance events occurring in the disturbed cell of the telecommunications network are recorded. The recorded call events with recorded disturbance events are then correlated. A distribution of disturbed and offending cells within the telecommunications network as a function of time is computed to obtain a statistical correlation of call events in offending cells and subsequent disturbances resulting in the disturbed cell to identify the possible source of disturbances that caused the sealing of the sealed device with in the disturbed cell.

Abstract: A meteor scatter communications system for communicating between a master station and one or more remote stations. In one exemplary embodiment, a broad beam transmitter probe signal is reflected from a meteor ionization trail to a remote station which then transmits a return data signal to the master station. The master station receiver has a plurality of antennas and a receiver beam forming network which forms a plurality of narrow beam receive signals, one of which has a high gain and corresponds to the narrow beam signal which illuminates the meteor trail and contains the reflected return data signal from the remote station. The master station processor selects such one narrow beam signal for processing the data therein.

Abstract: An over the horizon communications system includes a transmitter for generating a signal to be communicated, an acoustic source located on the earth in a direction from the transmitter that the communication is to take place which is capable of providing periodic variations in the density of the atmosphere, and means for directing the transmitter at the variations to cause the signal to be redirected over the horizon to a point of reception. The point of reception may be a radar target and the signal may be returned, or the point of reception could be a communication receiver.

Abstract: The specification discloses a meteor burst communication system including at least two spaced apart master stations, in association with a plurality of groups of remote stations spaced at locations remote from the master stations, with each group being associated with one of the master stations. Each of the master stations incudes a radio transmitter for transmitting probing digital radio signals having address portions which are directed from the master station for reflection from meteor trails to the remote stations associated with the master station. Circuitry is provided to vary the length of the address portions transmitted by the master station in dependence upon desired signal-to-noise and timing considerations. Each of the remote stations includes a radio receiver for receiving the reflected probing digital radio signals from the master stations. Each of the remote stations also includes at least one sensor of physical characteristics such as snow depth, rain fall or the like.

Abstract: A meteor burst communication system utilizing a master station and a large number of remote stations. A master station transmits a probing radio signal which, when reflected from a suitably positioned meteor trail, is received by a remote station. The remote station verifies that the received signal is being transmitted by a master station and then decides whether to respond to the probing signal, depending upon an a number of internal factors, including whether it has data available to send and when it last transmitted data to the master station. The master station can also address specific remote stations or transmit messages to all remote stations simultaneously.

Abstract: The specfication discloses a meteor burst communication system including at least two spaced apart master stations, in association with a plurality of groups of remote stations spaced at locations remote from the master stations, with each group being associated with one of the master stations. Each of the master stations includes a radio transmitter for transmitting probing digital radio signals having address portions which are directed from the master station for reflection from meteor trails to the remote stations associated with the master station. Circuitry is provided to vary the length of the address portions transmitted by the master station in dependence upon desired signal-to-noise and timing considerations. Each of the remote stations includes a radio receiver for receiving the reflected probing digital radio signals from the master stations. Each of the remote stations also includes at least one sensor of physical characteristics such as snow depth, rain fall or the like.