Abstract: A signal processing method, applied in a wireless communications module having a receive path, prevents a nonlinear device in the receive path from using an amplitude modulated transmit or other bleed-over signal in the receive path to modulate a non-amplitude modulated jammer signal on the receive path (or to further modulate an already amplitude modulated jammer signal). The bleed-over signal is conditioned by adding one or more amplitude modulated dummy signal(s) having an envelope that complements an envelope of the bleed-over signal, forcing the nonlinear circuit to operate linearly with respect to the jammer signal. Output of the amplifier may be filtered to remove signals having bandwidths of the dummy signal(s), bleed-over signal, jammer signal, and any intermodulation products generated by introducing the dummy signal(s).

Abstract: The technique of the present invention prevents troubles, such as the lowered baud rate, in wireless communication.

Abstract: Voicemail user interface methods and apparatus for mobile communication devices are disclosed. Voicemail notification messages corresponding to voicemail messages are received through a wireless receiver of the mobile device and voicemail message header lines corresponding to them are displayed in a message list. In one illustrative example, the mobile device provides a graphical user interface (GUI) for the end-user with visual objects corresponding to PLAY, REWIND, FAST FORWARD, SKIP BACK, SKIP FORWARD, as examples, which provides for transparency of voicemail system-specific commands. Preferably, the mobile device receives the voicemail notification messages from several different voicemail systems for consolidating such processing using this single common user interface.

Abstract: A request to access the network sent by a terminal is intercepted and a selective restriction criterion is evaluated on the basis of parameters relating to the intercepted access request. A radio signal is sent to jam an acknowledgment signal sent by the network in response to the access request if the selective restriction criterion is satisfied.

Abstract: A satellite broadcast receiving converter has a housing, a waveguide, and a short-circuit wall, which are stamped out of a single metal sheet and are then folded.

Abstract: A method and system are disclosed for ensuring data availability for a plurality of programmable radios that are waveform agile and that are capable of operating over a plurality of different data links. An enterprise network management tool makes a determination of the threat states for each waveform supported on the programmable radios, and the enterprise network management tool communicates with the programmable radios to advise the programmable radios that a waveform has been compromised. The threat states determined by the enterprise management tool are used to identify which channels are available for dynamic reassignment and which are not. The identity of the available channels and the comprised channels are communicated to a gateway. The gateway establishes a plurality of virtual networks for the programmable radios, and the gateway transitions a programmable radio from one virtual network to another, when service has been denied on the intended delivery path that has been compromised.

Abstract: A method for reducing interference in a mobile network in which a node A is to establish a proposed wireless link with node B. The method includes: (a) determining a node E that transmits on a frequency equal to a frequency of the proposed link between node A and node B and which can transmit to a node D; (b) determining an effective gain of an antenna on node D with respect to interference from the proposed link between node A and node B, assuming an X-percentile beam criterion selected in accordance with a desired self-interference limit; (c) estimating a carrier intensity arriving at node D from node E; (d) determining a ratio of node E to node D carrier to potential interference from node A; and (e) conditioning establishment of the proposed link between node A and node B upon the determined ratio.

Abstract: An elliptical satellite system which carries out communication. The satellite orbits a height above the earth less than that necessary for geosynchronous orbits. When the satellite is near the apogee portion of its orbit, its velocity approximates the rotational velocity of the earth, and during that period it appears to hover over the earth. Each ground station on the earth always communicates a satellite within a predetermined position of its apogee, and hence that satellite appears to the ground station to hover over the earth. The satellite hence does not communicate with any earth station when it is outside of that apogee portion. During the times when the satellite is outside the apogee portion, its communication is therefore shut off to prevent.any possibility of interfering with geosynchronous satellites. During this time, the power supply on the satellite is also used to charge a battery on the satellite.

Abstract: A selective blocker for targeted mobile terminals. A signal monitor determines when a targeted mobile terminal is transmitting a signal to a base station. A signal analyzer identifies characteristics of the terminal signal and a processor produces a blocking response based on one or more characteristics. The blocking response is transmitted to the targeted mobile terminal to block communications between the targeted mobile terminal and the base station using the minimum power needed to effectively block the terminal signal so as to limit interference with non-targeted mobile terminals.

Abstract: Multi-channel self-interference cancellation is provided in relayed electromagnetic communication between a first device and one or more other devices on one or more shared frequency channels. Specifically, near signals are generated at the first device and transmitted to a relay station. A composite signal is received at the first device from the relay station containing relayed versions of the near signals and relayed versions of remote signals transmitted from the one or more other devices, the composite signal having frequency channels including the one or more shared frequency channels, each shared frequency channel occupied by at least one of the relayed near signals and one of the relayed remote signals. One or more cancellation signals are selectively generated, each having a frequency band corresponding to one of the shared frequency channels. The cancellation signals are combined with the composite signal to produce a desired signal representing the relayed remote signals.

Abstract: A method and system for providing selective interference mitigation (or nulling) in an adaptive array system. A communication device, typically employing an adaptive array, determines an indication of signal reception quality for a first remote user terminal in communication with the communication device. The communication device provides a first mode of operation wherein a first amount of nulling with respect to at least one interfering source is generated by the communication device. In addition, the communication device provides a second mode of operation characterized by generating a second amount of nulling with respect to the at least one interfering source, wherein the second amount of nulling is relatively greater than the first amount of nulling. Based on the relative signal reception quality indication, the communication device selects one of the first and second modes of operation.

Abstract: A system and method for controlling interference affecting user terminals in a communications network, such as satellite terminals in a satellite communications network, by establishing and using virtual cells which are independent of the cells formed by the spot beams generated by the satellite. The system and method employs an interference detector which is adapted to detect interference in the network which interferes with an ability of at least one user terminal to communicate in the network, and an interference source identifier which is adapted to identify a source of the interference by deactivating at least one select group of the user terminals based on criteria independent of the respective cell or cells in which the user terminals reside, to locate those terminals whose ability to communicate in the network is being interfered with by the detected interference.

Abstract: A method and apparatus for processing a received signal carrying data via multiple subcarriers at respective subcarrier frequencies is disclosed herein. The method includes assessing jamming interference on the subcarrier frequencies. In response to the assessed interference, respective reliability metrics are assigned to the subcarriers. The signal is then demodulated using the reliability metrics so as to recover the data.

Abstract: A method and apparatus for circumventing jamming of receivers for a global positioning system (GPS) include determining that a receiver is being jammed by a jamming signal not originating from the GPS. A first signal is transmitted from a portable unit including the receiver to a component of a second positioning system that is different from the GPS. A second signal is received from the second positioning system. The second signal includes data that indicates a position for the portable unit determined in the second positioning system based at least in part on the first signal.

Abstract: Methods and apparatus for providing client feedback to a broadcast source to provide content on demand in broadcast systems. Client systems may tune-in to a stream of content descriptors that describe content in consideration for future broadcasting, and provide feedback in the form of ranking feedback or rating feedback to the broadcast source such that a list of desired content may be constructed in order to send content to the client systems on an as-needed basis or in batches.

Abstract: An apparatus and method for disabling wireless communication devices establishes a disabling zone. Inside the disabling zone, one or more capabilities of the wireless communication devices are disabled. The wireless communication devices may include cellular phones, beepers, pagers, portable computers, electronic personal attendants, and/or similar wireless devices. In a first embodiment, the zone is formed in conjunction with a power monitoring unit proximate the zone. In a second embodiment, the zone is formed in conjunction with a position monitoring system determining the geographical position of the wireless communication devices. In both the first and second embodiments, the zone may be either geographically fixed or moveable.

Abstract: The present invention is to a method and system for providing protection from an EMS-targeted weapon by providing an appropriate spoofed EMS signal to cause an EMS-targeted weapon to determine an apparent object distance sufficiently close to the EMS-based targeting threat to nullify the weapon. In a first embodiment, the EMS-based targeting threat uses reflected EMS emissions, such as RADAR, to target the object the apparent object distance nullifies the weapon by falling within a weapon-safety lockout distance determined by a fire control system of the targeting threat. In another embodiment, the EMS-based targeting threat uses EMS signals from an external source, such as GPS, to target a position of the object and the apparent object distance nullifies the weapon by causing premature detonation at a safe standoff distance from said object.

Abstract: A system for publicly displaying messages includes one or more mobile units, each including an automotive vehicle carrying a publicly visible electronic display; a computer for controlling the images shown on the display; and a radio for transmitting and receiving information, including information about which messages should be shown on the mobile unit's display. A central system receives and sends information to radios on the mobile units to control what messages they display. In some embodiments the mobile unit includes programming to enable a remote computer, such as a central system computer, to have remote access over the radio to commands of the mobile unit's computer's operating system. In some embodiments, the information transmitted by a mobile unit's radio includes information about the status of the mobile unit's computer. This can include how much more room its memory has, how utilized its CPU is, how much radio traffic it is having, what display message it is currently showing, etc.

Abstract: An improved communications jamming receiver is disclosed wherein time division multiplexing techniques are utilized that permit monitoring enemy radio frequency transmissions while in essence concurrently transmitting signals to jam selected enemy transmissions. The time division multiplexing alternately enables the communications receiver and a jamming transmitter at a frequency higher than the Nyquist rate of the threat signal being received to effectively continuously receive enemy transmissions while preventing reception of the jamming signals from the associated jammer transmitter. The multiplexing is carried on in a random fashion that prevents the enemy from determining the rate and transmitting during the period that the improved receiver is disabled.

Abstract: The invention relates to a method for admission control in an interference-limited cellular radio network. Admission can be accepted, if there is a sufficient number of free channels whose measured interference level goes below the interference threshold determined for the channel. The interference threshold of the channel is changed adaptively to ensure the best possible quality of the service offered. In case the quality value of the served radio connections is very good, the interference threshold value of the channel is raised.

Abstract: A method and device for achieving reliable prevention of cellular telephone calls, within a given area. In the preferred embodiment, the device and method operate to block the control frequencies of the cellular system within a given area. The device broadcasts a blocking signal with a low power output, which interferes with the reception ability and decoding of signals and commands broadcast at the control frequency. Thus, the handshake routine of the telephone/cellular subscriber with the local cellular system is prevented. Operation of the device is achieved in several ways, manually, automatically, and/or by remote control. Its operation prevents cellular communication ability by subscribers within the area or within the effective blocking range, which is derived from the effective radiated power (ERP) of the blocking signal, its type and the type of communications/or blocked system.

Abstract: A system and method for a multi-band direct conversion wireless communication receiver is presented. The system incorporates a low noise amplifier (LNA) configured to amplify received RF signals, a local oscillator (LO) configured to output a frequency, and I and Q channel mixers. Each mixer has a first input operatively coupled to the LNA, a second input operatively coupled to the LO output, and an output. The system further includes an adjustment mechanism configured to adjust drive level of the LO depending on a level of jammers detected by the receiver. Thus, the receiver may operate in multiple wireless communication bands and modes and meet the associated specifications.

Abstract: A system capable of varying the operating current of at least one frequency source in the receiver of a communication device in response to the presence of an undesired signal within a frequency band of signals received at the receiver. The system may include a condition signal indicative of the presence of an undesired signal within a frequency band of signals received at a receiver and a controller that adjusts a frequency source responsive to the condition signal.

Abstract: The invention relate to a data processing appliance with a local computer unit which correspond to a local data file system for calling and for storing and for bi-directional data transferring of a volume data file by means of a computer unit and an user identification unit, which is corresponding to the local computer unit, which enable an access on volume data files through the computer unit by an authorized user as a reaction on its positive identification only, whereby the volume data file in the local data file system is stored in a non-usable, encrypted form, which is not usable for a user, whereby a data transferring path of volume data file between the local computer unit and the local data file system comprise a corresponding key management unit as a part and functionality of the local computer unit, which generate and assign at least one user specific and volume data specific key file for each volume data file, the key management unit with a portion of the local data file system, which is connected

Abstract: A vehicle control system includes a radio transponder to be carried by a user, and a radio transponder reader at the vehicle for generating control signals to enable at least one vehicle function based upon receiving a desired radio signal from the radio transponder when positioned in proximity to the reader. A jammer radio transmitter at the vehicle selectively prevents the radio transponder reader from receiving the desired radio signal from the radio transponder based upon a controller, such as an alarm controller of a vehicle security system, especially an after-market security system. The controller preferably includes a receiver for receiving remotely generated signals to operate the jammer radio transmitter. The control system may also include a remote transmitter for generating control signals to be received by the receiver. For example, the remote transmitter may be a portable transmitter carried by the user, or may be a satellite, cellular or paging transmitter remote from the vehicle.

Abstract: Wireless telecommunications is inhibited within a limited region by generating a noise signal within a frequency range of the wireless telecommunications and broadcasting the noise signal into the limited region. A system for inhibiting wireless communications includes a radio frequency noise generator generating a noise signal within a frequency range of the wireless telecommunication. At least one antenna broadcasts the noise signal into the region. Control logic initiates or suspends broadcasting of the noise signal based on at least one control input.

Abstract: A portable radio telephone is provided, which turns off or on automatically the communication function when the user enters a prohibited area or exits from the area, respectively, and at the same time, the built-in additional convenient functions are kept operable even after the communication function is turned off. The telephone comprises: (a) a radio section for receiving an input radio signal and/or transmitting an output radio signal; (b) a power supply controller for controlling supply of electric power to the radio section responsive to reception of a power-off signal; the power-off signal being transmitted from a power-off signal transmitter provided in a prohibited area where use of a portable radio telephone is prohibited; and (c) a power-off signal sensor for sensing reception of the power-off signal to notify the power supply controller of reception of the power-off signal.

Abstract: An interruption-free hand-held positioning method and system, carried by a person, includes an inertial measurement unit, a north finder, a velocity producer, a positioning assistant, a navigation processor, a wireless communication device, and a display device and map database. Output signals of the inertial measurement unit, the velocity producer, the positioning assistant, and the north finder are processed to obtain highly accurate position measurements of the person. The user's position information can be exchanged with other users through the wireless communication device, and the location and surrounding information can be displayed on the display device by accessing a map database with the person position information.

Abstract: The invention is a cellular radio system for terminals with narrowbeam antennas that provides demand assignment multiple access channel assignment under a guaranteed channel quality criterion. The invention features an efficient channel assignment algorithm that utilizes a database of measured the co-channel interference characteristics of subscriber terminals to eliminate significant co-channel interference in assigned channels. The use of measured terminal interference characteristics eliminates the occurrence of unexpected random occurrence of large co-channel interference in channel assignments thus permitting the use of more spectrally efficient cellular frequency reuse patterns.

Abstract: The object of the call masking system for mobile telephones is to prevent the operation of mobile telephones which are present in a closed environment without interfering with the normal operation of other telephones which are outside the closed environment. To this effect, the system generates interference signals which will prevent the mobile telephones from receiving the signaling channels sent by the base stations (for example, GSM call signaling channel). The system monitors the power with which the carriers of the neighboring base stations are received inside the room and will adjust the interference power radiating in the signaling channels so that the carrier to interference signal ratio will make the operation of the mobile telephones impossible. The system can be applied to closed environments wherein mobile telephones should not ring when receiving a call.

Abstract: In this invention, only text data is displayed on a portable telephone when access is made to a page which is made public on the Internet by use of the portable telephone, and an image of the page and information indicating a URL of the page are stored into a predetermined folder according to an instruction for storage of the page from the portable telephone based on the operation by the user.

Abstract: In a multinode, wireless packet-hopping network, all nodes operate on a same frequency, by waiting for each other. If the frequency is subject to excessive out-of-network jamming, the building computer transmits a “time-bomb”, i.e. an instruction for all nodes to change to a different frequency at a fixed time.

Abstract: The invention is a cellular radio system for terminals with narrowbeam antennas that provides demand assignment multiple access channel assignment under a guaranteed channel quality criterion. The invention features an efficient channel assignment algorithm that utilizes a database of measured the co-channel interference characteristics of subscriber terminals to eliminate significant co-channel interference in assigned channels. The use of measured terminal interference characteristics eliminates the occurrence of unexpected random occurrence of large co-channel interference in channel assignments thus permitting the use of more spectrally efficient cellular frequency reuse patterns.

Abstract: Apparatus for detecting the difference in phase between received signals at two spaced antennas and for then retransmitting equal amplitude antiphase signals from the two spaced antennas is disclosed.

Abstract: A server scrambles received pay information in an internal scrambler and then transmits the result to a terminal which sent a request. A second charge managing portion determines a charge for the pay information for billing a contractor who manages the server, based on a coefficient of charge outputted from a terminal managing portion. The coefficient of charge is determined based on attributes of the terminal that uses the pay information, the number of the terminals which use the pay information, attributes of users who use the terminals, etc. The charge of use can thereby be obtained according to a degree of actual use at a users' side.

Abstract: A method for processing a calling message in a telecommunication system to restrict calls incoming through a telecommunication unit during a particular period of time. The method includes the steps of implementing a setting mode to reject calls incoming during the particular period of time, setting a rejection mode of incoming calls by inputting said particular period of time; detecting whether or not said rejection mode of incoming calls has been set if there is a call after said setting of the rejection; detecting whether or not the present time falls within the set particular period of time if said rejection mode of incoming calls has been set; and avoiding an incoming call if the call is made during said particular period of time.

Abstract: A portable electronic device embodying the present invention comprises a USB connector, an internal power source, a USB controller to execute data communication processing for data communication with a personal computer connected to the USB connector, a main CPU to execute device operation processing for usual operation of the device. When USB controller executes data communication processing, the device is supplied with power at high voltage from the personal computer through the USB connector. When the main CPU executes device operation processing, the device is supplied with power at low voltage from the internal power source.

Abstract: A method and apparatus for detecting interference in radio frequency signals for use in wireless alarm systems which increases a charge voltage in response to a dc-coupled signal during a charging time when the dc-coupled signal contains interference, decreases a charge voltage in response to a dc-coupled signal during a discharging time when the dc-coupled signal contains substantially no interference, compares the charge voltage to a reference voltage, provides an interference status signal in an off state when the charge voltage is less than the reference voltage, and provides the interference status signal in an on state when the charge voltage is greater than or substantially equal to the reference voltage.

Abstract: The invention relates to a transmission blocker for mobile telephones as well a method for preventing transmission activities of mobile telephones in the vicinity of safety-relevant electronic devices, comprising a device for transmitting radio signals as interference signals in the frequency range of the relevant mobile radio network in such fashion that synchronization of the mobile telephone with a radio station and/or decoding of the information in the signaling channel and/or recognition of the relevant signals from the mobile radio network can be prevented.

Abstract: A communications network (10) having a plurality of wireless nodes (12-28) distributed within a region of interest makes routing decisions based on terrain information for the region of interest. A link quality determination unit (54) determines the quality of individual node-to-node links within the network (10), based on the location of the nodes (12-28) and the terrain about the nodes (12-28). A path selection unit 58 then determines an optimal path through the network 10 based on the link quality information. In one embodiment, communications corridors (102) are defined as preferred subpaths within a network for use in connecting remote nodes.

Abstract: A remotely operable radio frequency jamming device having a jamming transmitter and a local controller in communication with a remote commander. The local controller has a signal receiver and decoder component for receiving, decoding and causing by electronic command the device to perform a remotely initiated instruction signal. In particular, the receiver and decoder component of the local controller can receive and decode a remotely initiated instruction signal to activate or inactivate the jamming device and thereafter cause by electronic command the activation or deactivation of the device. To effectuate the jamming of enemy radio signals, the receiver and decoder component of the local controller can receive and decode a remotely initiated instruction signal to transmit a selected jamming band from the transmitter of the jamming device, and thereafter cause by electronic command the transmitter to transmit the selected band.

Abstract: A wired modem normally plugs directly into a computer and connects to a telephone system by wired connection to a wall jack. This same modem can be used in a wireless configuration by plugging it into a single-module base station unit located near the wall jack and containing a baseband-to-wireless transceiver. A single module remote station plugs into the computer in place of the modem, and contains another baseband-to-wireless transceiver for communicating wireless data with the base station. The base and remote stations duplicate very little of the functionality performed by the modem, making the modem easily replaceable in either wired or wireless configurations.

Abstract: A facility having particular data to transmit over a transmission medium, contends for access to the medium by transmitting a jamming signal over the transmission medium for a particular duration of time that is a small fraction of the amount of time that the facility had to thus far wait to so contend. If the transmission medium is found to be idle at the expiration of that time, then the facility accesses the medium. Otherwise, the facility waits until the transmission medium again becomes idle and then re-contends for access.

Abstract: A method of preventing a response to a rouge poll message in an AVI system is presented. The method entails that during the transmission of the poll message from the interrogator to the transponder, wherein the poll message reflects off an undesirable position, thereby creating the origination of an undesirable poll message, i.e. a poll message which will be received by a wrong transponder, a jamming signal is also transmitted at the same frequency and from the point from which said reflected poll message originates. The jamming signal and the poll message create a rogue poll message as received by the transponder wherein at least one bit within the transmitted poll message is flipped. Transponders, upon receiving said rogue poll message, calculate the CRC and compare the calculated CRC with the received CRC. The rogue message should yield an invalid CRC, i.e. a CRC unlike the received CRC, and therefore, the transponder will fail to respond to the jammed poll message.

Abstract: In a wireless security system having a plurality of RF sensor/transmitters and a system controller, jamming signals are detected by comparing a near-term noise value with the expected signal strength of transmissions from the RF sensor/transmitters minus a detection threshold, and with the sum of a long-term noise value and a jamming threshold. In addition, the trend of the long-term noise value is analyzed to determine whether a jamming signal is being intentionally and gradually introduced into the security system environment. The system controller may include a plurality of antennas. Jamming may be detected for each antenna or for all of the antennas, collectively.

Abstract: An improved navigation satellite receiver with a super heterodyne receiver channel configured to provide a first local oscillator frequency between L1 and L2 such that the down converted intermediate frequencies of L1 and L2 can be processed by the same intermediate frequency stages and a second mixer stage. A radio frequency (RF) selector switch is provided to select between inputting L1 and L2 to the first mixer. The RF switch is controlled by a digital signal processor (DSP) that also provides automatic gain control (AGC) to an intermediate frequency amplifier. Histories and expected levels of AGC for each of L1 and L2 are maintained by the DSP. The RF switch is briefly toggled over to select one of L1 or L2, while tracking a satellite on the other carrier frequency, just long enough to sample the AGC level needed. If the level is too high, given the histories and expectations for such levels, the sampled carrier frequency is assumed to be jammed, and a high risk for switching over.

Abstract: A device for detecting the presence of spurious energy on a bus based network. The device identifies the subscriber location which is the source of spurious energy and includes disconnection capability to remove that subscriber location from the network.

Abstract: A method and apparatus for providing periodic subscription television services comprises a way for subscribers who cannot afford the fees for full time television services such as a regular cable television service to obtain subscription service to a plurality of allocated channels on a periodic basis. The method comprises the steps of allocating channels to a periodic service offering and storing in memory of service denial apparatus service code data which represents the allocated channels. The service denial apparatus for providing periodic service comprises a service denial device such as a switch 389 or other circuit controlled by a controller 260 of service denial apparatus for periodically closing and opening service lines to the periodic service subscriber in accordance with predetermined periodic service intervals.

Abstract: A scanning radio receiver for indicating the presence of operating consumer electronics by detecting the electromagnetic radiation at each scanned frequency is disclosed. The detected field strength at the antenna at each scanned frequency is compared to a first threshold of 20 .mu.v/m from 400 KHz to 88 MHz, 30 .mu.v/m from 88+ MHz to 216 MHz, and 40 .mu.v/m from 216+ MHz to 918 MHz and a first alarm is sounded should the detected field strength exceed this first threshold. The detected field strength at the antenna at each scanned frequency is also compared to a second threshold of 1 mv/m and a second alarm, distinct from the first is sounded should the detected field strength exceed this second threshold. This device is useful for detecting the unauthorized operation of electronic equipment in the vicinity of mission critical or life support electronics which may be susceptible to consumer electronics generated EMI.

Abstract: Off-premises cable television pay per view apparatus is coupled between first and second diplexers of off-premises subscriber service providing equipment. The diplexers separate the transmission path between a headend and a subscriber into downstream or forward and upstream or reverse transmission paths. A radio frequency transmitter is coupled between a controller and the upstream diplexer which may actuate a selected one of a plurality of data channels in the notoriously noisy subsplit 5-30 megahertz transmission spectrum for reporting billable events. On-premises equipment is minimized to comprise only a unidirectional data transmitter. The data transmission is sent repetitively over a predetermined period of time before the data transmitter, comprising a microprocessor, turns itself off to conserve power.