Abstract: A Master-Slave Dwelling technique associated with modified Bluetooth hopping provides performance gains and extended ranges of operation for slow Doppler situations (slower than 1-3 Km/h). The Master and Slave make use of only the good frequencies (frequencies for which the channel is not in a fade due to Raleigh fading) over the Bluetooth transmission bandwidth.

Abstract: A radio frequency identification (RFID) tag comprises a transceiver and a component coupled to the transceiver. The transceiver is adapted to wirelessly receive power from an RFID reader and/or from a mobile communication device. The power received from the mobile communication device is used to power the component, providing an alternative power source (cellular beacons) that uses no additional handset power.

Abstract: Wirelessly-linked, distributed resource control (RCS1-RCSn, RCSB, RCC, ARM) supports a wireless communication system (50) for operation in non-exclusive spectrum (24-29). An available resource map (ARM) contains resource availability information gathered by mobile stations (MS1-MSn), and a wired communication channel supports sharing of resource control information among fixed-site stations (BS).

Abstract: Wirelessly-linked, distributed resource control (RCS1-RCSn, RCSB, RCC, ARM) supports a wireless communication system (50) for operation in non-exclusive spectrum (24-29). An available resource map (ARM) contains resource availability information gathered by mobile stations (MS1-MSn), and a wired communication channel supports sharing of resource control information among fixed-site stations (BS).

Abstract: A communications system including devices (10, 20) for transmitting and receiving wireless communications over licensed and unlicensed bands is disclosed. On the transmit side, a device (10) includes a plurality of message sources (8A, 8B, 8C) and a smart router (12) function executed by a processor (30) within the device. The smart router (12) function allocates each wireless transmission, or components of a multicomponent wireless transmission, over a licensed wireless link (LLTX) or an unlicensed wireless link (ULTX), by optimizing various factors. The allocation factors include the availability of the unlicensed and licensed channels within range of the transmitting device (10); quality of service parameters such as time delay limits, jitter limits, bandwidth requirements, and the like; cost tolerance and cost per minute factors; power consumption expectations; and a combination of these and other factors. Transmission of the wireless message over the selected wireless links is then carried out.

Abstract: A first periodic voltage waveform (20) is downconverted into a second periodic voltage waveform (35, 36). A plurality of temporally distinct samples (SA1, SA2, . . . ) respectively indicative of areas under corresponding fractional cycles of the first voltage waveform are obtained. The samples are obtained in response to a control signal indicative of a code used to produce the first voltage waveform, and the samples are combined to produce the second voltage waveform.

Abstract: A radio frequency identification (RFID) tag comprises a transceiver and a component coupled to the transceiver. The transceiver is adapted to wirelessly receive power from an RFID reader and/or from a mobile communication device. The power received from the mobile communication device is used to power the component, providing an alternative power source (cellular beacons) that uses no additional handset power.

Abstract: Wirelessly-linked, distributed resource control (RCS1-RCSn, RCSB, RCC, ARM) supports a wireless communication system (50) for operation in non-exclusive spectrum (24-29). An available resource map (ARM) contains resource availability information gathered by mobile stations (MS1-MSn), and a wired communication channel supports sharing of resource control information among fixed-site stations (BS).

Abstract: Wirelessly-linked, distributed resource control (RCS1-RCSn, RCSB, RCC, ARM) supports a wireless communication system (50) for operation in non-exclusive spectrum (24–29). An available resource map (ARM) contains resource availability information gathered by mobile stations (MS1-MSn), and a wired communication channel supports sharing of resource control information among fixed-site stations (BS).

Abstract: In one embodiment, an automated emergency alert system includes a handheld portable communication device operable to initiate communication over a wireless telecommunications network, a dynamic sensor operable to generate an acceleration profile for the device, and a memory operable to store one or more predefined acceleration profiles each associated with an emergency event.

Abstract: A wireless communications apparatus and corresponding system having an improved DAC operable at higher speed than heretofore achievable which exploits the sigma-delta principle in a different way. More particularly, the invention comprises a wireless user terminal (302) and corresponding system (300) that implement a digital-to-analog conversion circuit (105) including a storage means (110), such as a read only memory, for storing delta-sigma analog sequences corresponding to all possible values of a digital input (106) coupled to a plurality of one-bit digital to analog converters (120, 122, 124, 126). Each of the digital-to-analog converters (120, 122, 124, 126) are clocked by multi-phase clocks, such that each phase applied to each one of the digital-to-analog converters (120, 122, 124, 126) is delayed with respect to one another by the oversampling period.

Abstract: A network of electronic devices such as computers (50) and/or calculators (36, 38) uses low power communication to transmit wireless signals through a distributed antenna system (40). The distributed antenna system may be formed in conjunction with ceiling or floor tiles 62 or modular office components (44 and 46) or student desks. The distributed antenna system 40 reduces the effective distance between a transmitting and receiving device to a nominal distance.

Abstract: A wireless user terminal (42) and system (40) implementing a mixed signal CODEC (100) including an improved sigma-delta ADC (18) which limits input signals into a switched capacitor configuration and avoids adding circuit overhead in the signal path is disclosed herein. This sigma-delta analog-to-digital converter (18), having an input signal and an output signal, includes a switch (sw1), a clipping circuit (20), and a known sigma-delta ADC (34). It solves the clipping signal problem by limiting the signal right at the input of the sigma-delta ADC (34). The clipping circuit (20) couples to the switch (sw1) and the sigma-delta ADC (34) for switching the voltage applied to the sigma-delta ADC between the input signal (vin) and at least one threshold voltage (Vn and Vp).

Abstract: A location determination apparatus, method and system (10, 23, 26, 32, 36, 48, 52, 60, 64, 74, 78, 84, 90, 106) that is an improvement upon existing location determining techniques. The invention enables precision indoor location determination through the use of non-DTV terrestrial broadcast signals (e.g. one way, wide area, dissemination of information)(20), or re-broadcast signals (44, 56, 70, 80) of the proposed (terrestrial based) digital satellite radio relay transmitters (42, 54) to provide position location. This solution does not require a local receiver to correct for long distance propagation dispersion, particularly for the satellite relay, as the digital radio satellites are already synchronized to GPS time.

Abstract: A communications system including devices (10, 20) for transmitting and receiving wireless communications over licensed and unlicensed bands is disclosed. On the transmit side, a device (10) includes a plurality of message sources (8A, 8B, 8C) and a smart router (12) function executed by a processor (30) within the device. The smart router (12) function allocates each wireless transmission, or components of a multicomponent wireless transmission, over a licensed wireless link (LLTX) or an unlicensed wireless link (ULTX), by optimizing various factors. The allocation factors include the availability of the unlicensed and licensed channels within range of the transmitting device (10); quality of service parameters such as time delay limits, jitter limits, bandwidth requirements, and the like; cost tolerance and cost per minute factors; power consumption expectations; and a combination of these and other factors. Transmission of the wireless message over the selected wireless links is then carried out.

Abstract: The phase difference between a known stable reference signal (11) and a known signal output by a wireless mobile communication device (5, 5B) is determined at several known locations (1-4, 1B-4B). The location of the wireless mobile communication device is then determined from the phase difference information. Also, the approximate location of a wireless mobile communication device (5A) can be estimated by transmitting a message from the device at a predetermined power level (71), and determining where among a plurality of predetermined locations (1A-4A) the transmitted message has been received.

Abstract: A hearing assist device (10) for a person (P). The device comprises a speaker device (SP1) for presenting sound to an ear canal of the person and circuitry for identifying a specified area relative to the person. The device further comprises a first microphone (M1) for providing a first sound signal in response to a first sound source located inside the area and in response to a second sound source located outside the area. Further, the device comprises a second microphone (M2) for providing a second sound signal in response to the first sound source and the second sound source. Still further, the device comprises circuitry (16) for determining a position of the first sound source and the second sound source in response to the specified area, the first sound signal and the second signal. Finally, the device comprises circuitry (16) for outputting a processed signal in response to the position.

Abstract: Wirelessly-linked, distributed resource control (RCS1-RCSn, RCSB, RCC, ARM) supports a wireless communication system (50) for operation in non-exclusive spectrum (24-29). An available resource map (ARM) contains resource availability information gathered by mobile stations (MS1-MSn), and a wired communication channel supports sharing of resource control information among fixed-site stations (BS).

Abstract: Wirelessly-linked, distributed resource control (RCS1-RCSn, RCSB, RCC, ARM) supports a wireless communication system (50) for operation in non-exclusive spectrum (24-29). An available resource map (ARM) contains resource availability information gathered by mobile stations (MS1-MSn), and a wired communication channel supports sharing of resource control information among fixed-site stations (BS).

Abstract: Wirelessly-linked, distributed resource control (RCS1-RCSn, RCSB, RCC, ARM) supports a wireless communication system (50) for operation in non-exclusive spectrum (24-29). An available resource map (ARM) contains resource availability information gathered by mobile stations (MS1-MSn), and a wired communication channel supports sharing of resource control information among fixed-site stations (BS).