Abstract: In a converter for satellite broadcast reception having a fixing structure provided with a circuit board, a plurality of radio-frequency circuits mounted on the circuit board and separated from one another by a grounding pattern, a chassis having ribs arranged in a pattern that corresponds to the grounding pattern, and a mount plate placed on the back surface of the circuit board, a rubber plate having resilience is placed between the circuit board and the mount plate. This permits the grounding pressure with which the grounding pattern of the circuit board is kept in contact with the chassis to be distributed uniformly, and thereby permits stable grounding to be achieved.

Abstract: A method of relaying data between mobile stations in a cellular communications system is provided. The system comprises a number of mobile stations and base stations. Each base station makes synchronization transmissions within its area of covers, which define a broadcast control channel for the transmission of broadcast data from the base station to mobile stations within the area of coverage. The synchronization transmissions are received at mobile stations within the area of coverage, which extracts data defining the broadcast control channel, and at least one calling channel on which mobile stations can transmit probe data to one another. The probe data is used by the mobile stations to obtain connectivity information relating to the availability of other mobile stations. The synchronization transmissions also contain data which is used to define at least one traffic channel which is used by the mobile stations to relay message data between themselves.

Abstract: A wireless communications system has a plurality of base stations, a plurality of mobile vehicular repeater units, and a plurality of portable units. In a typical context, each mobile vehicular repeater unit is associated with at least one portable unit, and both may be associated with a single user. The object is for the user(s) to be able to access the wireless network for any geographic location. In cases where a geographic area is shadowed from a base station and communication directly between the portable unit and the base station is not possible, it is beneficial to use the mobile vehicular repeater unit in accordance with an extended coverage mode of operation, to relay communications between the portable unit and the base station. A mobile vehicular repeater unit constructed according to the present invention enters the extended coverage mode of operation in response to receipt of an access request, transmitted by a first of the plurality of portable units.

Abstract: The invention relates to a method of rendering telecommunication devices ineffective by creating a substantially radio frequency radiation-free environment. An interference generating pattern is provided adjacent the environment in a position between the environment and a source of radio frequency radiation signals so as to substantially reduce, or interfere with such signals thus preventing typical operation of the telecommunications devices therein. Preferably, the interference generating pattern is provided by applying silicon carbide as a coating or as part of a building material onto a structure to reduce attenuation by at least 20 to 50 decibels. Other aspects of the invention include the building materials that have the interference generating pattern associated therewith and the substantially radio frequency radiation-free environments that are created according to the methods disclosed herein.

Abstract: A system and method for wireless broadband transmission in a scattering environment using a network of coherent repeaters. In one embodiment, the system comprises a number of groups of nodes. The nodes in a group are capable of broadcasting to each other and of beamforming to another group of nodes. A basestation broadcasts a number of signals at the same frequency and time. Each signal comprises a desired signal and multiple interference signals. The signals arrive at the nodes as co-channel interferers. The nodes are able to distinguish between the signals sent from each antenna of the basestation. Each of the nodes is further operable to transmit a repeated signal to a destination node such that the repeated signals collectively cancel out co-channel interference at the destination node. Therefore, the destination node receives a signal substantially free of co-channel interference.

Abstract: A method and radio station for transmitting information, wherein frequency channels of a frequency band are arranged in accordance with a first coarse raster system and a second fine raster system, the raster system being used, in particular, for performing an efficient frequency channel search and for the effective coding of the frequency channels.

Abstract: A method and a system for monitoring telephone calls are described. A useful signal (which represents the call information of a telephone call) and a data set (which contains at least one digital subscriber tag) are supplied to a recording center (20). The data set is supplied to a relaying device (28), in which it is compared with stored comparison data sets. If the subscriber tag matches a corresponding comparison tag of a selected comparison data set, a communications link is produced to a monitoring device (36).

Abstract: A test device to isolate and locate problems in a wireless transmission antenna system by selectively inducing multiple faults in an independent integral configuration. The test device is used in conjunction with test analysis equipment allowing a technician to induce independent multiple faults system test configurations to detect, isolate and locate feed line and antenna system problems. By selectively connecting the test device at different points along the transmission path dependent on the test analysis outcome, the exact physical location of the problem can be determined within the transmission circuit.

Abstract: An apparatus for interfacing at least one landline telephone service, at least one wireless cellular-type telephone service, at least one cellular-type wireless telephone and at least one standard telephonic type communication device through standard building interior telephone cable.

Abstract: A transceiver circuit is disclosed for use in radio frequency communication systems. The circuit includes a transmitter circuit, a receiver circuit and a local oscillator circuit. The local oscillator circuit includes at least one oscillator input signal having a frequency that is a non-integer multiple of the transmission frequency of the radio frequency communication system. The oscillator input signal is used to produce a transmitter local oscillator signal and a receiver local oscillator signal.

Abstract: The portable telephone capable of more effectively reducing the electromagnetic energy to be radiated therefrom and absorbed by the human body during its use is provided.

Abstract: An equal gain composite beamforming technique which constrains that the power of the signal output by each antenna is the same, and is equal to the total power of the transmit signal divided by the number N of transmit antennas from which the signal is to be transmitted. By reducing output power requirements for each power amplifier, the silicon area of the power amplifiers are reduced by as much as N times (where N is equal to the number of transmit antennas) relative to a non-equal gain CBF.

Abstract: An amplifier circuit includes a power amplifier biased for saturated mode operation, and a controllable current source to provide supply current to the power amplifier. The controllable current source effects desired amplitude modulation of the output signal from the power amplifier by modulating the supply current it provides responsive to an amplitude information signal.

Abstract: The invention relates to a cellular phone terminal system, and in particular to a method for changing timbre of a voice signal during conversation in a cellular phone terminal system having a filter for filtering a PCM input signal. The method comprises the steps of: waiting for a timbre selector key input for a desired timbre when a timbre converter key is inputted during conversation; and setting a filter coefficient of the filter correspondingly to the timbre selector key input and filtering the PCM signal to change timbre.

Abstract: An embodiment of the present invention provides an automatic gain control system for a wireless receiver that quickly differentiates desired in-band signals from high power out-of-band signals that overlap into the target band. The system measures power before and after passing a received signal through a pair of finite impulse response filters that largely restrict the signal's power to that which is in-band. By comparing the in-band energy of the received signal after filtering to the total signal energy prior to filtering, it is possible to determine whether a new in-band signal has arrived. The presence of this new in-band signal is then verified by a multi-threshold comparison of the normalized self-correlation to verify the presence of a new, desired in-band signal.

Abstract: A device for ensuring that the amplitude of signals fall within a predetermined range, said device comprising input means for receiving a plurality of input signals at substantially the same time, a first path for increasing the amplitude of any of the input signals having an amplitude below a first threshold, a second path for decreasing the amplitude of any of the input signals having an amplitude which exceeds a second threshold and combining the outputs of the first and second paths to provide a plurality of signals having amplitudes between said first and second thresholds.

Abstract: To minimize the overall circuitry necessary in a multiband-frequency generator, output terminals of a voltage-controlled multiband oscillator (22-1, . . . , 22-N) are coupled to a frequency synthesis unit (10) via a frequency selective coupling unit (24). The frequency synthesis unit (10) derives a phase difference between a frequency control input signal and the output signal of the frequency selective coupling unit (24) to control the voltage-controlled multiband oscillator (22-1, . . . , 22-N).

Abstract: A system and method for quickly detecting and remedying an interference incident caused by one of a plurality of mobile terminals in communication with a transponded satellite. The method makes use of a time line constructed from communications of each of the mobile terminals. The time line forms a real time, sequential record of events wherein various mobile terminals have made contact with the transponded satellite. The method extrapolates from the time line which one of the mobile terminals has caused an interfering event by determining which mobile terminal accessed the communication system just prior to the interference event arising.

Abstract: A method of avoiding conversion spurs in a multi-conversion radio frequency receiver having a first local oscillator, an intermediate frequency filter and a second local oscillator in series generates, based on a center frequency for the intermediate frequency filter, a table of problem frequencies of the first local oscillator relative to a frequency of the second local oscillator which produce harmonic mixing products within the bandwidth of the intermediate frequency filter versus corresponding frequency offsets for the second local oscillator which retune the frequency of the second local oscillator so the harmonic mixing products are moved outside the bandwidth of the intermediate frequency filter.

Abstract: A quadrature divider includes a first analog mixer (20, 30) for receiving a digital input signal at a predetermined frequency at a first input of the mixer and a second analog mixer (24, 32) for receiving the input signal with a 180° phase shift at a first input of the mixer. The output of the first mixer is coupled to a second input of the first mixer and an output of the second mixer is coupled to a second input of the second mixer.

Abstract: A compensation circuit to correct for mismatch in a quadrature receiver comprises first and second mixers to receive a radio frequency (RF) modulated signal. One mixer receives an I local oscillator signal while the second mixer receives a Q local oscillator signal wherein the I and Q local oscillators have frequencies that are substantially identical. The output of the first and second mixers are coupled to first and second filters, respectively, which generate the I and Q output signals, respectively. Inherent circuit mismatch generate gain and/or phase errors that result in mismatch in the I and Q output signals. A correction circuit automatically applies a correction factor to at least one of the I and Q output signals to correct the gain and/or phase error by applying a multiplication factor to at least one of the I and Q output signals to thereby generate a corrected signal. The correction factors must be determined on a unit by unit basis.

Abstract: Double balanced mixers having transistor pairs are affected by area mismatches between the transistors. The area mismatches can be represented as a ratio between the mixer core transistors that is directly related to voltage. Thus, an input voltage into one of the mixer core transistors in a transistor pair can compensate for the area mismatch. The compensation is achieved by a voltage track and hold feedback loop to one of the mixer core transistors.

Abstract: The present invention provides for a modular communication system to be installed in a motor vehicle. The communication system in accordance with the teachings of the present invention includes a base unit and a removable unit. The base unit is provided with a cavity to insert the removable unit. The communication system is rendered inoperable when the removable unit is removed from the base unit. The removable unit is provided with two surfaces that perform different function. In particular when the removable unit is inserted into the base unit and the first surface is exposed then the communication system operates as a radio player. The removable unit is capable of being reversed such that second surface is exposed, then the communication system operates as a telephone unit.

Abstract: An apparatus for coupling signals to a transmission line, such as a power line (120). The apparatus comprises an input for receiving a wanted signal; a first coupler for coupling the wanted signal (Vmain) onto the line at a first position (Y); a cancelling means (WB, WR, WY), coupled to the input, for deriving a cancelling signal (Vaux) from the wanted signal; a second coupler for coupling the cancelling signal onto the line at a second position (X), spaced from the first position; wherein the wanted signal and the cancelling signal destructively combine in a single direction of propagation along the line while enabling the wanted signal to propagate in the other direction along the line. The apparatus can be used to minimise radiation from an unshielded part of an electricity distribution network, such as substation (100), or to allow re-use of a frequency band on other power lines.

Abstract: To provide a portable telephone system in which use of the portable telephone set is automatically limited in a site where the use of the set is limited and in which causes of non-response and other various information can be transmitted over a low power channel to a control device, for transmission to an originating party who called the use-limited portable telephone set.

Abstract: A prepaid/postpaid reconfiguration logic module in a service control point (SCP) of a wireless network allows a subscriber to a prepaid wireless service to change payment options between prepaid and postpaid without requiring assistance from a customer care representative. Standard wireless intelligent network (WIN) messaging is used to change from a previously selected prepaid or postpaid payment option, allowing the new option to be applied to their wireless phone account before or after any or all usages (i.e., as frequently as on a call-by-call basis). Preferably, a subscriber is given the opportunity to change the prepaid/postpaid payment option not only before but also after each usage of the relevant mobile device. Changes between prepaid and postpaid payment options substantially immediately affect a real time change in the payment mode of the subscriber.

Abstract: The invention concerns a cellular radiocommunication system comprising a network core (21) including switches (28, 30, 32), one or several gateways (28, 32) to external networks, subscriber management means (33) and billing management means (34, 35). Several radio access networks (22, 40), including each base stations (24, 42) capable of radio communication with mobile stations (23), are connected to the network core switches. Said radio access networks include an access network (22) managed with the network core by a cellular operator and at least an additional access network (40) having a substantially less extensive radio coverage and a substantially wider bandwidth than the one managed by the cellular operator. When setting up a communication with a mobile station through the network core and one of the access networks, a report message is generated specifying the access network concerned.

Abstract: Disclosed is a home zone service method for assigning a specified zone to a mobile telephone subscriber and charging the subscriber at different billing rated accordingly as the subscriber makes a telephone call inside or outside the zone. According to the home zone service method, a zone which is defined by a first measurement value and a second measurement value as a sub-sector is determined by measuring a round trip delay from a fixed location in a sector of a cell to the neighbor base stations to which the subscriber belongs, so that a predetermined home zone database including the first value and the second value is prepared. The round trip delay is measured from a specified signal if a portable mobile terminal of the subscriber generates a request signal to establish a call connection. Then, it is determined whether the subscriber is located inside the sub-sector if the measured round trip delay falls between the first value and the second value of the home zone database.

Abstract: A system and method for preventing the unauthorized use of improperly obtained mobile equipment is disclosed. The mobile equipment includes a plurality of personalization categories that are programmable into the mobile equipment by the manufacturer. Prior to purchase and at the request of the network provider, at least one of the personalization categories in addition to the network personalization category is enabled in the mobile equipment by the manufacturer. Upon powering up the mobile equipment for the first time, a personalization check is performed for the plurality of personalization categories. The personalization check is destined to fail with respect to one of the personalization categories other than the network personalization category. At this point, the person attempting to activate the mobile equipment is prompted for the authorization code for the personalization category that failed.

Abstract: A communication system and a method of communication for a user of a portable information terminal are provide which are capable of automatically acquiring information of an occasion that the user desires while the portable information terminal is being used by the user and of carrying out communication among users having best matching conditions in terms of time (T), place (P), and individual preference according to occasion (O) (may be referred to as an occasion) of the user. The communication system is made up of portable information terminals and a center being communicated via a wireless communication unit. The center has a spot information database and a user TPO (Time, Place, and Occasion) database. Element information is extracted by the center from a message received from the user. By learning a desired occasion of the user, a user TPO database is produced.

Abstract: The present invention provides for a system and method of wirelessly triggering portable devices to provide a user with audio and/or visual information related to a show or attraction, for example, or for the purposes of captioning, language translation, assistive listening, and descriptive audio. As a person moves about a venue, a portable device receives signals from transmitters at venue locations. Transmissions may be via infrared or radio signals. The receiving device decodes each signal as a venue location, event time, or device trigger. The receiving device processes the signal and its memory to start a presentation on the device. The portable device memory contains audio, text, graphics, and/or visual content; device playback may contain one or many of these stored contents. The stored content may be synchronized with the user's location, time of travel, time of day, time of a show, or an event in a show. Stored content may be in one or many languages.

Abstract: A channel plan with a corresponding test plan are implemented in connection with a plurality of nodes that communicate signals. The channel plan has one or more predefined specifications for each of one or more signal channels on each of the nodes. The channel plan enables a monitoring system to, among other things, conduct automatic periodic test plans, comprising tests, on the nodes, based upon the predefined data specified in the channel plan. Each test plan prescribes measurement of at least one signal parameter, pertaining to one or more nodes as a whole and/or to one or more channels contained within the nodes. The monitoring system includes a spectrum analyzer, a switch enabling the spectrum analyzer to interface with the nodes, and a controller controlling the switch and the spectrum analyzer. The controller is configured to enable creation of and display the channel plan and test plan, based upon user inputs.

Abstract: A method and system for detecting failures in a wireless communications network. A computer is programmed to remotely access a platform, such as a network switch or database, that stores data indicative of the performance of the wireless communications network infrastructure. The computer downloads the data, parses the data to extract wireless communications network events such as dropped calls, noise or lack of audio, sorts the events, and passes the events through an event-to-failure mapping module to identify probable network component failures. Data is preferably analyzed over periods of less than 24 hours. The probable failures are preferably reported to network operations personnel who can then resolve the failures on a more timely basis.

Abstract: A method and system supporting location based services for a mobile electronic device that supports multiple wireless communication technologies. The mobile device contains a resource proxy for dynamically storing a set of resources that are available to the electronic device and that are location specific, e.g., accessible via a point that is near the electronic device. The resource proxy contains a resource table recording the available resources and a gateway table indicating a pathway for reaching the data. The resource proxy definitions are technology independent with respect to the communication mechanisms required to obtain the data. Resources are added to the resource proxy via a resource discovery mechanism automatically performed by the mobile device. Multiple network gateways can be defined and each is responsible for requesting and retrieving information for the resource proxy.

Abstract: A satellite radiotelephone system includes a space-based component, a plurality of ancillary terrestrial components, and a plurality of radiotelephones. The space-based component is configured to provide wireless radiotelephone communications using satellite radiotelephone frequencies. The plurality of ancillary terrestrial components include a plurality of ancillary terrestrial component antennas configured to provide wireless radiotelephone communications using at least one of the satellite radiotelephone frequencies in a radiation pattern that increases radiation below the horizon compared to above the horizon. The plurality of radiotelephones are configured to communicate with the space-based component and with the plurality of ancillary terrestrial components. Each radiotelephone also includes a GPS signal processor and a GPS mode filter that is configured to suppress energy at (1575.42−&Dgr;) MHz, where 0<&Dgr;≦16.42 MHz. Related radiotelephones and methods are also discussed.

Abstract: A call processing method capable of home-zone additional service in a mobile communication system, in particular, which gives subscribers a discount in accounting without an additional equipment if the subscribers call within previously registered areas. According to the call processing method capable of home-zone additional service in the mobile communication service of the invention, the subscriber can be provided with the home-zone additional service with low cost, thereby enhancing customer satisfaction.

Abstract: A digital-mobile-wireless-communications apparatus and the system using the same evaluate a transmission environment of transmission paths. The communications apparatus calculates not only a Doppler frequency of carrier waves based on a velocity of the communications apparatus, but also a receiving-electric-field intensity based on a received radio wave. Furthermore, it has a capability of acquiring the transmission environment of the transmission paths by an evaluation based on the calculated two results, i.e., the Doppler frequency and the receiving-electric-field intensity, and data in a bit-error-rate (BER) vs. receiving-electric-field-intensity characteristics model using a carrier frequencies' shift (Doppler frequency) as a parameter.

Abstract: This invention relates to a method and apparatus for controlling application processor occupancy based traffic overload. More particularly, the invention is directed to a system to maintain call processing related traffic below a predefined threshold in application processors that are typically incorporated into communication networks.

Abstract: A method and apparatus implement network planning in a radio system in a desired area. To determine transmitter coverage, a vector map describing the surroundings of the transmitter and containing a description of buildings and surfaces reflecting radio waves in the area is used. The transmitter signal strength is measured at points of a desired area. A subset is selected among the points, path attenuation is determined between all subset points using a ray tracing method, and the calculated values are stored in a memory. When performing network planning, a transmitter and a receiver are located at the points in the areas; a given number of the most significant signal paths among the possible signal propagation paths between the transmitter and the receiver is searched for using the values stored in the memory, and the transmitter signal strength is determined at the receipt location point using the ray tracing method.

Abstract: A radio communication system has a random access channel for the transmission of data (214) from a secondary station to a primary station. Such a channel is intended for use by secondary stations having data (214) to transmit to a primary station while not actually engaged in a call. By enabling access requests (202) to be transmitted with a greater range of possible signatures, a much greater number of degrees of freedom is available to a secondary station requesting access to a random access channel. This enables significantly improved efficiency of resource allocation by increasing the amount of information transmitted to the primary station by the access request (202).

Abstract: Various method and apparatus provides for matching revision levels used by a mobile station (102-104) and a base station (101, 160) for establishing a communication link. The mobile station repeats, for a number of times, the transmission of a request for establishing a communication link between the mobile station and the base station. The mobile station detects failure of establishing the communication link with the first revision level based on repeating the request for the number of times. The mobile station changes the first revision level to the second revision level at the mobile station for establishing the communication link.

Abstract: Methods and apparatus for estimating mobile station location in a wireless communication system. At initiation of a call or a page response, a mobile station of the system sends an access request signal to a primary base station. The primary base station responds with an access acknowledgment which may be intentionally delayed such that the mo bile station increases its transmit power level. The primary base station then transmits a channel assignment message to the mobile station. The mobile station responds by transmitting a location signal in the form of a known user-specific traffic preamble at the higher transmit power level. The primary base station intentionally delays sending an acknowledgment of the preamble, such that the mobile station transmits the preamble for a longer period of time than it would otherwise.

Abstract: A dynamic method of delivering regionally relevant information to a plurality of geographically disperse and mobile environments, such as, for example, motor vehicles, allows passengers to immediately access regionally relevant information, such as weather, traffic, points of interest, restaurants, advertisements for local establishments, etc., without incurring expensive air-time from connecting through cellular infrastructure. The invention utilizes a filtering process referred to herein as dynamic geo filter/fencing (DGFF). This involves a receiver element in a mobile environment, such as a motor vehicle, taking a geo-code reading (e.g., latitude and longitude readings obtained from a GPS satellite via a GPS receiver) for identifying the location of the vehicle, then logically drawing a fence around that location reading, for example two miles square. At a separate location (e.g.

Abstract: A location managing method for managing a location of a mobile station in a mobile wireless packet communication system in which each of communication nodes down to a base station have a hierarchical structure, wherein a route from a communication node positioned at a highest layer of the hierarchical structure to a base station of a cell in which a mobile station is located, is managed as location information of the mobile station, by being distributed to the communication node located at the highest layer of the hierarchical structure and to each of communication nodes in the route to the base station.

Abstract: A method and system for using two-way ranging navigation to accurately determine the location of a transponder platform above-Earth or a fixed or mobile target on the ground or on water. The two-way ranging navigation measurements are used as calibration references, thereby improving the positioning accuracy of GPS. The system includes GPS and a two-way ranging navigation system for taking position measurements of a target. A correction factor is determined as a function of the measurements and the GPS position is adjusted by the correction factor. The method for calibrating GPS using two-way ranging navigation involves taking a two-way ranging navigation measurement and a GPS measurement of a target, determining a correction factor as a function of the measurements, and correcting the GPS position by taking a second GPS measurement and adjusting it by the correction factor.

Abstract: A method and communication system for assigning the plurality of fingers to demodulation paths in a path list which insures that at least one finger will be assigned to a demodulation path supporting a supplemental channel, if one exists. The method involves determining whether any of the fingers is demodulating a supplemental channel (112). When no fingers are demodulating supplemental channels, the it is determined whether the sector containing the path under consideration supports supplemental channels (114). If the sector containing the path under consideration supports supplemental channels, then the method determines the strength of the signal path relative to the weakest finger (116).

Abstract: An apparatus and a method for dividing power within a service area serviced by a pico-base transceiver station (Pico-BTS) are disclosed. The apparatus for dividing power in a Pico-BTS includes a repeater for amplifying, by a prescribed degree of amplification, a signal provided by a Pico-BTS main unit, and a power divider for controlling the amplified signal so that it is equally divided within a service area serviced by the Pico-BTS.

Abstract: The present invention provides for a software configurable wireless modem that can be configured using software downloaded by a host computer. The user can select a preferred mode of operation, or mode selection can be done automatically based upon whether one or more predetermined criterion, such as a location of the modem, are met.

Abstract: The data stream between the transcoders (TCE1, TCE2) of a mobile wireless system is subdivided into a first data stream with samples for transmission and a second data stream with signal parameters for reconstruction of user data and/or for signaling. Both data streams are transmitted at the same time in particular in a handshake phase. The invention permits an improvement in the quality of transmitted data, e.g., speech data in a GSM network in tandem operation between mobile subscribers, in particular during a handshake phase.

Abstract: A method for transporting wireless communication signals between a base station hotel and remote cell sites with separately digitized RF carrier signals is provided. Separately digitized carriers are transmitted over a digital network between the hotel and the remote sites, remaining in digital format until reaching terminal antenna units. At the antenna units, downlink digital signals are converted to analog RF signals and transmitted, while uplink analog signals are received and converted to digital signals. A corresponding system comprising a base station hotel, at least one remote site, and a digital data network connecting the hotel to the remote site is provided. The hotel includes a plurality of base stations and a digital hub for interfacing the hotel to the network. The remote site includes a set of antenna units connected via a local data link to a network access node for interfacing to the network.