With Demodulator Patents (Class 455/21)
  • Patent number: 10123293
    Abstract: A user equipment (UE) may detect a primary synchronization signal and a secondary synchronization signal. The secondary synchronization signal may be derived from a shift of a sequence and sectors and cells may have different shifts of the sequence. A UE may determine, based on the detected primary synchronization signal and the secondary synchronization signal, an identity of a cell.
    Type: Grant
    Filed: April 8, 2016
    Date of Patent: November 6, 2018
    Assignee: INTERDIGITAL TECHNOLOGY CORPORATION
    Inventors: Guodong Zhang, Kyle Jung-Lin Pan, Allan Yingming Tsai
  • Patent number: 9479245
    Abstract: Even if a relay apparatus such as a mobile router indicates the radio wave reception intensity as low, medium, and high levels, a user using the relay apparatus such as a mobile router cannot recognize that the communication quality is lowered because the radio wave reception intensity is too high.
    Type: Grant
    Filed: February 16, 2015
    Date of Patent: October 25, 2016
    Assignee: SoftBank Corp.
    Inventors: Masayuki Kamimura, Yosuke Mitsuya, Tadashi Suzuki
  • Patent number: 9118959
    Abstract: Providing personal multi-device nomadic media is described herein. In different aspects, the techniques may include providing content to a user on a first device and suspending the delivery of the content on the first device. The user may register on a second device and resume delivery of the suspended content on the second device.
    Type: Grant
    Filed: November 29, 2012
    Date of Patent: August 25, 2015
    Assignee: AT&T Intellectual Property I, L.P.
    Inventor: Arnold Chester McQuaide, Jr.
  • Patent number: 8973060
    Abstract: There is provided a method where a terminal amplifies an MBS signal that the terminal receives using a terminal in an MBS service, transmits the amplified signal to another terminal and controls it in order to overcome the fact it is not possible to provide high quality contents over a broad area due to interference signals between MBS zones, a terminal is used as a repeater at MBS transmission time only, and an output of a repeating signal of the terminal is controlled so that an excessive interference signal for another MBS area is not generated when the terminal operates as a repeater.
    Type: Grant
    Filed: November 4, 2011
    Date of Patent: March 3, 2015
    Assignee: Electronics and Telecommunications Research Institute
    Inventor: Young-Il Kim
  • Patent number: 8838021
    Abstract: A two conductor hard wired communications link accepts an actual value of at least one parameter of interest from an environmental sensor in the form of data encoded on the conductors via current modulation. The sensor is mounted in a location remote from an irrigation controller. A circuit connected to the sensor transmits an RF signal representing an actual value of a parameter of interest detected by the sensor. A data relay is connected to the hard wired communication link of the irrigation controller. The data relay includes a receiver that receives the RF signal, and circuitry configured to extract the actual value of the parameter of interest and emulate a predetermined set of physical and protocol properties of the hard wired communication link of the irrigation controller.
    Type: Grant
    Filed: July 15, 2013
    Date of Patent: September 16, 2014
    Assignee: Hunter Industries, Inc.
    Inventor: Peter J. Woytowitz
  • Patent number: 8768245
    Abstract: Methods and systems are proposed for transmitting data from a source (110) to a destination (130) via a relay station (120) having multiple antennae (122, 124). The relay station (120) receives from the source a message containing the data and a first cyclic prefix. It does this using each of its antennae (122, 124), so producing multiple respective received signals. In certain embodiments, the relay station (120) removes the first cyclic prefix from the received signals, replacing it with a new one. In other embodiments, the relay station (120) removes only a portion of the first cyclic prefix. In either case, the relay station (120) may apply space-time coding to generate second signals, which it transmits to the destination (130), which extracts the data. Methods are also proposed for estimating parameters of the channel, to enable the destination (130) to decode the data.
    Type: Grant
    Filed: August 18, 2009
    Date of Patent: July 1, 2014
    Assignee: Agency for Science, Technology and Research
    Inventors: Lokesh Bheema Thiagarajan, Sumei Sun, Chau Yuen, Quee Seng Tony Quek
  • Patent number: 8704654
    Abstract: A high temperature communications circuit includes a power conductor for concurrently conducting electrical energy for powering circuit components and transmitting a modulated data signal, and a demodulator for demodulating the data signal and generating a serial bit stream based on the data signal. The demodulator includes an absolute value amplifier for conditionally inverting or conditionally passing a signal applied to the absolute value amplifier. The absolute value amplifier utilizes no diodes to control the conditional inversion or passing of the signal applied to the absolute value amplifier.
    Type: Grant
    Filed: June 7, 2007
    Date of Patent: April 22, 2014
    Assignee: The United States of America as Represented by the Administrator of National Aeronautics and Space Administration
    Inventors: Michael J. Krasowski, Norman F. Prokop
  • Patent number: 8681784
    Abstract: In one embodiment, one or more gateways sniff the voice channel during the voice mode. If it is determined that V.8bis signals are being initiated, then the gateway breaks these exchanges by suppressing such signaling. Modem relay communications then are allowed to proceed. Briefly, the method and apparatus involve monitoring a call during a voice mode phase for an initiating signal representative of the defined signaling, the monitoring being performed by a local gateway and, if such an initiating signal is detected during the monitoring, then suppressing such detected signaling in such manner that the signaling does not reach the remote gateway. Preferably, the monitoring is for an initiating signal characterized by a dual tone of defined frequency and duration of approximately 1375 Hz and 2002 Hz for a duration of approximately 400 ms or 285 ms, in agreement with the ITU-T Recommendation V.8bis (standard) adopted by the International Telecommunication Union.
    Type: Grant
    Filed: November 21, 2006
    Date of Patent: March 25, 2014
    Assignee: Cisco Technology, Inc.
    Inventors: Mehryar Khalili Garakani, Herbert M. Wildfeuer, Gavin Jin, Chieh-Wen Tsai
  • Patent number: 8681685
    Abstract: According to a detailed embodiment of the invention, the RS implements the following operations by using each of M shift parameter groups: Based on M shift parameters in the group, shifting respectively M decoded bit streams and merge the M shifted bit steams to get a check bit stream. Consequently M check bit streams are obtained by using M shift parameter groups. Then the RS transmits M check bit streams to the BS. The BS has received the M uplink signals from mobile terminals before and makes the M check bit streams as the check information of those uplink signals in order to check them better and reduce error rate. By adopting the method and device proposed by the invention, it is ensured in the low SNR regime error user rate or error block rate is more ideal in multi-user detection in the BS.
    Type: Grant
    Filed: April 28, 2009
    Date of Patent: March 25, 2014
    Assignee: Alcatel Lucent
    Inventors: Jun Li, Mingli You
  • Publication number: 20140065951
    Abstract: A first apparatus at a first base station changes directivity of a first antenna connected in a direction of a cell of a second base station adjacent to the first base station, where directivity of some antennas of a second apparatus at the second base station is changed to a cell of the first base station and some radio resources are assigned to wireless communication with the first apparatus. The first apparatus receives a signal of a first frequency from the second apparatus via the first antenna, converts the received signal into a signal of a second frequency, demodulates the signal of the second frequency, corrects a delay of the demodulated signal caused by propagation of a radio wave and frequency conversion, and modulates the corrected signal to a signal of a third frequency which is transmitted to a cell of the first base station via a second antenna.
    Type: Application
    Filed: August 2, 2013
    Publication date: March 6, 2014
    Applicant: FUJITSU LIMITED
    Inventor: Takashi OHASHI
  • Patent number: 8665845
    Abstract: A network element for a wireless communication system is locatable to couple at least one base station to an antenna array. The network element comprises at least one receiver arranged to receive a radio frequency signal from the at least one base station or the antenna array and modem logic operably coupled to the at least one receiver. The modem logic comprises radio frequency conversion circuitry arranged to down-convert a received radio frequency signal to a baseband signal; analogue-to-digital conversion logic arranged to convert the baseband signal to digitized signals; and beam-form processing logic arranged to perform active beam-forming adjustment on the digitized signals.
    Type: Grant
    Filed: February 12, 2010
    Date of Patent: March 4, 2014
    Assignee: Socowave Technologies Limited
    Inventors: Conor O'Keeffe, Joe Moore
  • Patent number: 8611809
    Abstract: A broadcast satellite single wire interface comprises a low noise block amplifier module having multiple outputs, a plurality of filter banks, each filter bank coupled to each of the outputs of the low noise block amplifier module in a respective fashion and comprising a plurality of filters, and a plurality of analog-to-digital (A/D) converters, each A/D converter coupled to a filter in the plurality of filters in the plurality of filter banks in a respective fashion, wherein the A/D converters directly sample incoming downconverted broadcast satellite signals and the sampled incoming downconverted broadcast signals are output on a single wire in a stacked output.
    Type: Grant
    Filed: August 3, 2012
    Date of Patent: December 17, 2013
    Assignee: The DIRECTV Group, Inc.
    Inventor: Robert F. Popoli
  • Patent number: 8509683
    Abstract: A two conductor hard wired communications link accepts an actual value of at least one parameter of interest from an environmental sensor in the form of data encoded on the conductors via current modulation. The sensor is mounted in location remote from an irrigation controller. A circuit connected to the sensor transmits an RF signal representing an actual value of a parameter of interest detected by the sensor. A data relay is connected to the hard wired communication link of the irrigation controller. The data relay includes a receiver that receives the RF signal, and circuitry configured to extract the actual value of the parameter of interest and emulate a predetermined set of physical and protocol properties of the hard wired communication link of the irrigation controller.
    Type: Grant
    Filed: August 28, 2012
    Date of Patent: August 13, 2013
    Assignee: Hunter Industries, Inc.
    Inventor: Peter J. Woytowitz
  • Patent number: 8498569
    Abstract: A communication system is provided that allows the use of low-cost, low-power remote terminal units that communicate substantially asynchronously and independently to a base station. To minimize cost and complexity, the remote terminal units are configured similarly, including the use of substantially identical transmission schemes, such as a common Direct Sequence Spread Spectrum (DSSS) code. To minimize collisions among transmissions, the communication system is designed to use a high-gain antenna with a limited field of view, to limit the number of cotemporaneous, or overlapping transmissions that are received at the base station. To cover a wide area, the limited field of view is swept across the area of coverage. To overcome potential losses caused by collisions, the remote terminal units are configured to repeat transmissions; to minimize repeated collisions, the repeat interval and/or duration is randomized.
    Type: Grant
    Filed: March 16, 2012
    Date of Patent: July 30, 2013
    Assignee: Comtech Mobile Datacom Corporation
    Inventors: Richard D. Fleeter, John E. Hanson, Scott A. McDermott, Raymond G. Zenick, Jr.
  • Patent number: 8306472
    Abstract: A repeater having different input and output frequencies converts a signal received with the input frequency to a first intermediate frequency signal based on a local oscillating frequency for intermediate frequency conversion, and converts the first intermediate frequency signal to a second intermediate frequency signal by performing digital processing on the first intermediate frequency signal. Then, the repeater generates a first frequency tone signal that corresponds to a difference between the input and output frequencies, and generates a second frequency tone signal from the local oscillating frequency for intermediate frequency conversion and the first frequency tone signal. The repeater up-converts the second intermediate frequency signal to the output frequency based on the second frequency tone signal, and transmits the signal.
    Type: Grant
    Filed: September 26, 2008
    Date of Patent: November 6, 2012
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Hyoung Soo Lim, Ho Min Eum, Sung Ik Park, Jae Hyun Seo, Yong Tae Lee, Yong Hoon Lee, Sung-Hoon Kim, Heung Mook Kim, Jong Soo Lim, Soo In Lee
  • Patent number: 8238813
    Abstract: A broadcast satellite single wire interface. Such an interface comprises a low noise block amplifier module having multiple outputs, a plurality of filter banks, each filter bank coupled to each of the outputs of the low noise block amplifier module in a respective fashion and comprising a plurality of filters, and a plurality of analog-to-digital (A/D) converters, each A/D converter coupled to a filter in the plurality of filters in the plurality of filter banks in a respective fashion, wherein the A/D converters directly sample incoming downconverted broadcast satellite signals and the sampled incoming downconverted broadcast signals are output on a single wire in a stacked output.
    Type: Grant
    Filed: August 20, 2008
    Date of Patent: August 7, 2012
    Assignee: The DIRECTV Group, Inc.
    Inventor: Robert F. Popoli
  • Patent number: 8218518
    Abstract: A software-defined radio (SDR) system that operates under a plurality of wireless communication standards. The SDR system comprises a reconfigurable maximum aposteriori probability (MAP) decoder capable of being configured under software control to decode a received data block according to a select wireless communication standard and a reconfigurable interleaver associated with the reconfigurable MAP decoder. The reconfigurable interleaver comprises a reconfigurable interleaver core circuitry capable of being configured under software control to operate according to the selected wireless communication standard and a unified interleaver interface for coupling a defined set of control and bus signals from the reconfigurable MAP decoder to the reconfigurable interleaver core circuitry.
    Type: Grant
    Filed: May 18, 2007
    Date of Patent: July 10, 2012
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Eran Pisek, Thomas M. Henige
  • Patent number: 8149155
    Abstract: A method of measuring a range from a reader unit to a non-contacted IC medium, includes: transmitting an inquiry signal at a first frequency from the reader unit to the non-contacted IC medium; causing the non-contacted IC medium to perform modulation to modulate the first frequency by using a second frequency to obtain a modulated frequency, and causing the non-contacted IC medium to respond to a response signal at the modulated frequency; causing the reader unit to receive the response signal to acquire a plurality of frequency components; calculating a phase difference between signals of at least two of the acquired plurality of frequency components; and measuring the range by using the phase difference.
    Type: Grant
    Filed: December 18, 2008
    Date of Patent: April 3, 2012
    Assignee: Omron Corporation
    Inventor: Takehiro Kawai
  • Patent number: 8090313
    Abstract: Aspects of a method and system for frequency-shift based chip-to-chip communications may include receiving and/or generating modulation control information and demodulation control information within a chip comprising one or more receivers and one or more transmitters. One or more modulation frequencies may be adjusted and utilized to generate transmit signals by the one or more transmitters based on the received modulation control information, wherein the one or more modulation frequencies may be distinct. One or more demodulation frequencies may be adjusted and utilized to generate intermediate frequency signals by the one or more receivers based on the received demodulation control information wherein the one or more demodulation frequencies may be distinct. The modulation control information and the demodulation control information may be received via a communication device comprising said chip.
    Type: Grant
    Filed: March 27, 2008
    Date of Patent: January 3, 2012
    Assignee: Broadcom Corporation
    Inventor: Ahmadreza Rofougaran
  • Patent number: 8036607
    Abstract: In a case where a switching source wireless communication system is a wireless communication system in which a transmission timing of a packet or data rate can be controlled in a wireless base station, the switching source wireless communication system, which notifies information on a timing when a wireless terminal communicates the switching destination wireless communication system with respect to the switching source wireless communication system in advance, starts time-division communication between switching destination and switching source wireless communication systems, and receives the timing information, controls a transmission timing or a data rate in accordance with the timing information.
    Type: Grant
    Filed: December 17, 2008
    Date of Patent: October 11, 2011
    Assignee: Hitachi Communication Technologies, Ltd.
    Inventors: Shiro Mazawa, Michio Iguchi, Takanori Moritomo, Masao Hayama
  • Patent number: 8018914
    Abstract: A demodulation section 13 receives a TDMA-TDD based phase-modulated burst signal of mobile communications and demodulates the burst signal by a synchronous detection system (or a quasi-synchronous detection system). The demodulation section 13 includes a frequency deviation compensation section and a carrier recovery section each having a loop filter 14 with three or more stages of time constants. The time constants are switched by a selector switch 15 based on a control signal from a demodulation control section 16. This achieves quick pull-in and jitter after convergence is minimized, thereby allowing highly efficient performance of frequency deviation compensation, etc. that is required for synchronous detection (or quasi-synchronous detection) without increasing the size of circuit.
    Type: Grant
    Filed: May 17, 2004
    Date of Patent: September 13, 2011
    Assignee: Mitsubishi Electric Corporation
    Inventor: Taisei Suemitsu
  • Publication number: 20110207399
    Abstract: Methods and systems are proposed for transmitting data from a source (110) to a destination (130) via a relay station (120) having multiple antennae (122, 124). The relay station (120) receives from the source a message containing the data and a first cyclic prefix. It does this using each of its antennae (122, 124), so producing multiple respective received signals. In certain embodiments, the relay station (120) removes the first cyclic prefix from the received signals, replacing it with a new one. In other embodiments, the relay station (120) removes only a portion of the first cyclic prefix. In either case, the relay station (120) may apply space-time coding to generate second signals, which it transmits to the destination (130), which extracts the data. Methods are also proposed for estimating parameters of the channel, to enable the destination (130) to decode the data.
    Type: Application
    Filed: August 18, 2009
    Publication date: August 25, 2011
    Inventors: Lokesh Bheema Thiagarajan, Sumei Sun, Chau Yuen, Quee Seng Tony Quek
  • Patent number: 7983213
    Abstract: In a radio communication apparatus having a plurality of transmitting and receiving functions that enable simultaneous signal transmission and reception, an arbitrary number of transmitting and receiving functions are assigned to another radio communication apparatus based on channel states.
    Type: Grant
    Filed: December 26, 2007
    Date of Patent: July 19, 2011
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kazumi Sato, Kiyoshi Toshimitsu
  • Patent number: 7890081
    Abstract: The demodulator by direct frequency conversion comprises a vector addition device having: a first circuit (1) that furnishes, starting from a first AC signal (LO), a respective AC signal to n outputs that are not all of the same amplitude and of the same frequency, but are out of phase with regard to one another in such a manner that each one is not either in phase nor in opposite phase with any other; a second circuit (2) that splits a second AC signal (RFin) toward n outputs; a number n of summers (3a, 3b, 3c) each receiving, at the input, a respective output of the first circuit (1) and a respective output of the second circuit (2), and; a respective power sensor (4a, 4b, 4c) for each summer, whereby the number n is greater than or equal to 3. The demodulator also comprises digital processing means (5, 6) that furnish the result of the demodulation.
    Type: Grant
    Filed: October 7, 2005
    Date of Patent: February 15, 2011
    Inventors: Bernard Huyart, Fernando Rangel De Sousa
  • Patent number: 7720022
    Abstract: A method and apparatus for maximizing the use of available capacity in a communication system having a base station and a plurality of mobile stations. The forward link includes a plurality of traffic streams sent on at least one channel from the base station to the mobile stations. The forward link is subject to a maximum power ceiling. A first output power level associated with simultaneously transmitting a first set of one or more traffic streams on the forward link is initially determined. Next, the first output power level is compared to the maximum power ceiling; and at least one time frame in the forward link having available capacity for transmitting a portion of at least one further traffic stream is identified. The first set of traffic streams and the portion of the at least one further traffic stream are then transmitted simultaneously during the at least one frame on the forward link.
    Type: Grant
    Filed: February 8, 2001
    Date of Patent: May 18, 2010
    Assignee: QUALCOMM Incorporated
    Inventors: Edward G. Tiedemann, Jr., Stein A. Lundby
  • Patent number: 7634250
    Abstract: A signal conditioner (SC) and method for performing communications via a shared transport medium between a base transceiver station (BTS) and a remote antenna entity (RAE). A first SC is connected to the BTS and a second SC is connected to the RAE. Each SC interfaces to the transport medium. The first SC receives an RF signal representing a combined digital signal (CDS) from the BTS. The first SC recovers and conditions the CDS, and then transmits the conditioned CDS to the second SC via the transport medium. The second SC receives the conditioned CDS, recovers the CDS, produces an RF signal representing the CDS, and transmits this RF signal to the RAE. The RAE sends this RF signal to an antenna of the RAE for transmission of this RF signal via the antenna. First SC and second SC also facilitate communication of a CDS from RAE to BTS.
    Type: Grant
    Filed: March 17, 2006
    Date of Patent: December 15, 2009
    Assignee: Sprint Spectrum L.P.
    Inventors: Sunil Prasad, Janet Ruth Dianda
  • Patent number: 7551856
    Abstract: A method and apparatus for controlling a plurality of infrared devices (ICDs) is provided herein. A remote controller is used to generate an optical signal for controlling a plurality of ICDs. The optical signal generated by the remote controller is converted into an electrical signal by an infrared repeater device. An implementation of such a system includes a rotary mechanical switch to direct the electrical signal generated by the infrared repeater device to a light emitting diode (LED) located near one of the plurality of ICDs. The LED converts the electrical signal into an optical signal and re-transmits the optical signal to the one of the plurality of ICDs. The system allows controlling the plurality of ICDs located in a remote location without having the user commute closer to such ICDs.
    Type: Grant
    Filed: July 24, 2007
    Date of Patent: June 23, 2009
    Assignee: The DIRECTV Group, Inc.
    Inventor: Donald Siu
  • Patent number: 7502430
    Abstract: A method and system provide the ability to measure a transmission performance characteristic. A signal is received and demodulated. An ideal signal is generated from the demodulated signal. The received signal is coherently averaged to reduce noise. The performance characteristic is the estimated TWTA nonlinearity from a difference between the coherently averaged ideal signal and received signal.
    Type: Grant
    Filed: October 8, 2004
    Date of Patent: March 10, 2009
    Assignee: The DIRECTV Group, Inc.
    Inventor: Ernest C. Chen
  • Patent number: 7502429
    Abstract: A method and system provide the ability to measure a transmission performance characteristic. A signal is received and equalized. The equalized signal is demodulated and an ideal signal is generated from the demodulated equalized signal. A performance characteristic is the estimated from a difference between the ideal signal and the equalized signal.
    Type: Grant
    Filed: October 8, 2004
    Date of Patent: March 10, 2009
    Assignee: The DIRECTV Group, Inc.
    Inventor: Ernest C. Chen
  • Patent number: 7373104
    Abstract: A signal relaying apparatus includes a plurality of devices for relaying signals to and from distant nodes in a wireless communication network. At least one of the devices is an antenna; the devices may also include one or more cables. The devices are connectable to a transmitter and a receiver in the apparatus. The receiver receives a signal from one node through one of the devices; the transmitter transmits the same signal to another node through another of the devices. The signal may also be amplified or buffered before being transmitted. Because the signal is transmitted and received through different devices, the transmission of a signal packet can begin while the packet is still being received, thereby shortening the delay from reception to transmission, as compared with the delay in conventional apparatus that both receives and transmits the packet through a single antenna.
    Type: Grant
    Filed: November 30, 2004
    Date of Patent: May 13, 2008
    Assignee: Oki Electric Industry Co., Ltd.
    Inventor: Youiti Kado
  • Patent number: 7336732
    Abstract: A carrier frequency in a filtered received M-ary phase-shift keyed (MPSK) modulated signal having in-phase and quadrature components is detected by processing the filtered received signal to remove modulation components and thereby generate a test signal at the carrier frequency; processing the test signal to provide an amplitude spectrum of samples at different test frequencies; and processing the amplitude spectrum to detect the carrier frequency in accordance with the test frequency at which there is a test statistic of the highest magnitude. The magnitude of the test statistic is determined by processing a signal statistic in relation to a noise statistic. The signal statistic is the amplitude of the largest-amplitude sample. The filtered received signal is processed to provide approximate values of the modulus of the received signal and the phase of the received signal; and the approximate modulus and phase values are processed to generate the test signal.
    Type: Grant
    Filed: July 28, 2004
    Date of Patent: February 26, 2008
    Assignee: L-3 Communications Titan Corporation
    Inventor: John Robert Wiss
  • Patent number: 7324475
    Abstract: In a radio communication apparatus having a plurality of transmitting and receiving functions that enable simultaneous signal transmission and reception, an arbitrary number of transmitting and receiving functions are assigned to another radio communication apparatus based on channel states.
    Type: Grant
    Filed: February 25, 2003
    Date of Patent: January 29, 2008
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kazumi Sato, Kiyoshi Toshimitsu
  • Patent number: 7301377
    Abstract: A demodulation apparatus that can support various oscillation frequencies. The portable phone device includes a frequency synthesizer for generating a local-oscillation signal having a local oscillation frequency for converting the frequency of an input receiving signal into an intermediate frequency based on an oscillation signal generated by an TCXO and a synchronization hold portion provided with an NCO for generating a signal having a predetermined frequency based on the oscillation signal generated by TCXO. The frequency synthesizer makes the local oscillation frequency variable by setting the dividing ratio variable in accordance with an arbitrary oscillation frequency so that the intermediate frequency remains within a predetermined range regardless of the oscillation frequency, and an NCO makes the frequency of the signal variable by setting the dividing ratio variable in accordance with the oscillation frequency.
    Type: Grant
    Filed: February 21, 2003
    Date of Patent: November 27, 2007
    Assignee: Sony Corporation
    Inventors: Katsuyuki Tanaka, Masayuki Sawada, Hideki Takahashi, Koichiro Teranishi
  • Patent number: 7299005
    Abstract: A wireless repeater for receiving, amplifying and transmitting one or more wireless signals. The repeater comprises a signal processing device for determining one or more attributes of a wireless signal received from a mobile device and a memory for storing a reference list that includes one or more preferred frequency bandwidths to be repeated. The repeater also comprises a controller coupled with the signal processing device for comparing the one or more attributes of the wireless signal with the reference list, wherein the controller selects a first active set of one or more frequency bandwidths from the preferred frequency bandwidths based on the comparison. The repeater still further comprises a first reception filter coupled with the controller, where the first reception filter, responsive to control signal(s) from the controller, filters out signals, communicated to the first reception filter, having frequencies outside the first active set of frequency bandwidths.
    Type: Grant
    Filed: January 7, 2004
    Date of Patent: November 20, 2007
    Assignee: Sprint Spectrum L.P.
    Inventors: Mark L. Yarkosky, Dae-Sik Oh, Saad Z. Asif, Kristin A. Hayne, Shiva Narayanabhatla, John Cheong Wai Ngan
  • Patent number: 7174140
    Abstract: An RF system integrated with an RF switching unit and an RF modulator unit.
    Type: Grant
    Filed: April 30, 2004
    Date of Patent: February 6, 2007
    Assignee: LG Innotek Co., Ltd
    Inventors: Duck Su Oh, Yong Kyu Kim
  • Patent number: 7099383
    Abstract: Apparatus, and an associated method, for acting upon data signals received at a base station of a fixed wireless access communication system. A plurality of modems are positioned at the base station, and a controller controls to which modem that a data signal, transmitted by a particular subscriber station, is applied to a particular modem. Profiles relating to channel and signal characteristics are also maintained and used by the modem during demodulation operations.
    Type: Grant
    Filed: April 20, 2001
    Date of Patent: August 29, 2006
    Assignee: Raze Technologies, Inc.
    Inventors: Paul F. Struhsaker, Russell C. McKown
  • Patent number: 7068734
    Abstract: A passive coupling structure constructed using printed circuit board traces is used to separate the low and high frequency components of an incoming digital signal. The low and high frequency components of the signal are sent to separate receivers on an integrated circuit. The low frequency receiver may be a conventional level based receiver. The high frequency receiver is a Schmitt-trigger with hysteresis around a DC level or two comparators with separate reference voltages. The outputs of these receivers are combined to produce a receiver output that has increased reliability and noise immunity.
    Type: Grant
    Filed: October 8, 2002
    Date of Patent: June 27, 2006
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Karl Joseph Bois, David W. Quint, Randy K. Rannow
  • Patent number: 7069049
    Abstract: An apparatus and method for controlling a duplication structure of a Base station Transceiver Subsystem (BTS) is provided. The BTS has N number of sectors including a first sector to an Nth sector and M number of Frequency Assignments (FAs) including a first FA to an Nth FA. The apparatus and method includes N number of power dividers, each of which has M number of output ports and one redundancy output port, each of the power dividers dividing an input signal into equal-power signals each having 1/(M+1) power and outputting the power-divided signals through the M number of output ports and one redundancy output port.
    Type: Grant
    Filed: July 23, 2003
    Date of Patent: June 27, 2006
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Jae-Jin Kim
  • Patent number: 7031655
    Abstract: The conventional combination cannot realize an efficient road traffic system as a whole. A transmission system has a plurality of modules installed at different positions along a predetermined road. Each of the plurality of the modules includes a receiving section for receiving an input signal and a transmission section for transmitting an output signal on the basis of the input signal according to a predetermined radio scheme. Each of the plurality of the modules receives and transmits a signal, whereby the whole or part of the information contained in the signal is transmitted along the whole or part of the predetermined road. This transmission system can construct an efficient integrated road traffic system as a whole.
    Type: Grant
    Filed: September 14, 2001
    Date of Patent: April 18, 2006
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Noboru Nomura, Takashi Yoshida, Joji Kane
  • Patent number: 6980823
    Abstract: Various techniques for improving a wireless communication device are described. The techniques may include reducing power in a wireless communication device for a first sleep period and then increasing power in the wireless communication device for an intermediate wake period after the first sleep period to estimate an error of the sleep clock. The method may further include reducing power in the wireless communication device for a second sleep period after the intermediate wake period. The intermediate wake mode implemented during the intermediate period can be used to estimate the error of the sleep clock without performing one or more tasks associated with an awake mode, such as demodulation. The techniques may facilitate the effective use of low frequency low power clocks for sleep mode, even when relatively large slot cycles are defined within a slotted paging system.
    Type: Grant
    Filed: July 26, 2002
    Date of Patent: December 27, 2005
    Assignee: Qualcomm Inc.
    Inventors: Raghu Challa, Baaziz Achour, Robbin D. Hughes
  • Patent number: 6873823
    Abstract: In order to retransmit a communication channel at a specific frequency, a receiver may receive a signal including the communication channel's specific frequency. An analog to digital converter may generate a digital signal correlated to the received signal and the digital signal may be passed through a digital filter configured to filter the digital signal and pass frequency components at or around the frequency of the communication channel's specific frequency. A digital to analog converter may generate an analog signal correlated to the filtered digital signal and a transmitter may transmit the analog signal.
    Type: Grant
    Filed: June 20, 2002
    Date of Patent: March 29, 2005
    Assignee: Dekolink Wireless Ltd.
    Inventors: Abraham Hasarchi, Alex Baber
  • Patent number: 6865390
    Abstract: The present invention provides a cellular communication system that includes a central radio pool/traffic router (CRP/TR) that sends control and traffic signals over fiber optic transmission links that connect the CRP/TR with base stations of the cellular communication system. The high bandwidth capacity of each fiber link allows a large band of radio frequencies representing many radio channels to pass between the CRP/TR and individual base stations. Radio resources can be shared by all base stations in the cellular communication system, dynamically, when and where needed, to meet access demands throughout the system. The CRP/TR includes low-powered digital and/or analog radios and also switching and modulation means used to convey signals between the radios and various base stations within the system.
    Type: Grant
    Filed: June 25, 2001
    Date of Patent: March 8, 2005
    Assignee: Lucent Technologies Inc.
    Inventors: Stephen C. Goss, Paul Raymond Sand, Phillip Michael Sands
  • Patent number: 6823178
    Abstract: A point-to-point microwave radio link that operates in a Frequency Division Duplex (FDD) mode using direct digital modulation with a Continuous Phase-Frequency Shift Keyed (CP-FSK) scheme. The transmit signal is generated by a circuit that uses a Voltage-Control Oscillator (VCO) operating in a microwave radio band. The VCO is deviated over a narrow frequency range that is reduced by a predetermined factor. The output of the VCO is then frequency multiplied by the predetermined factor to produce the modulated microwave output signal at the desired band. The deviation frequency of the VCO is thus chosen to be the reciprocal of the multiplication factor times the transport bit rate.
    Type: Grant
    Filed: February 14, 2001
    Date of Patent: November 23, 2004
    Assignee: YDI Wireless, Inc.
    Inventors: Wayne E. Pleasant, Joseph Chandler
  • Publication number: 20040142716
    Abstract: A system and method reduce power consumption in a multi-hop wireless communications network. A signal is received from a source node in an intermediate node. The signal includes a request to relay a message to a destination node. The request includes information on power requirements to relay the message either in a relay mode or a regeneration mode. If the available power at the intermediate node exceeds the power requirements, then the request is accepted. Either the relay mode or the regeneration mode is selected, based on criteria for retransmitting the message, and the message is then relayed to the destination node using the selected mode.
    Type: Application
    Filed: January 21, 2003
    Publication date: July 22, 2004
    Inventors: Philip Orlik, Zafer Sahinoglu, Jinyun Zhang
  • Publication number: 20040110463
    Abstract: An antenna assembly includes a reflector dish and a unit attached at a distal end of an arm to receive satellite signals reflected from the reflector dish. The unit includes at least one low-noise block converter (LNB) to receive the satellite signals and a wireless communication transceiver that operates to transmit and receive video and data information within a surrounding range. It is emphasized that this abstract is provided to comply with the rules requiring an abstract that will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims.
    Type: Application
    Filed: December 10, 2002
    Publication date: June 10, 2004
    Inventor: Stephen G. Perlman
  • Patent number: 6745005
    Abstract: A method and apparatus for reducing deep fading of signals in satellite-based communications systems employing terrestrial repeater stations by shifting the phase of the signals transmitted from each terrestrial repeater station by a different amount so that the signals are transmitted from each terrestrial repeater station and received at a receiver at different phases, thereby effectuating time diversity in such signals to reduce deep fading of the signals. The method and apparatus can be used in CDMA and OFDM systems.
    Type: Grant
    Filed: August 11, 1999
    Date of Patent: June 1, 2004
    Assignee: Agere Systems Inc.
    Inventors: Hui-Ling Lou, Vijitha Weerackody
  • Publication number: 20040087272
    Abstract: A tone generator in a transceiver of a communications device may generate an arbitrary signal using two shift registers to generate the time intervals. During each time interval, a different capacitor is switched onto the node to change the voltage potential on that node. The amplitude of the waveform during each time interval is changed to provide the desired tone.
    Type: Application
    Filed: November 1, 2002
    Publication date: May 6, 2004
    Inventor: Luiz Franca-Neto
  • Publication number: 20030129999
    Abstract: A wireless relay system (1) comprises a wireless camera (11) and a reception relay station (12). The reception relay station (12) comprises a plurality of external reception units (13) arranged at spatially different positions and an internal reception unit (14). Each reception section (16) in the internal reception unit (14) demodulates a signal received in the external reception unit (13) and outputs a transport stream. At this time, each reception section (16) sets an error indicator flag to 1 for a TS packet causing a transmission error which exceeds the error correction capability. A TS synthesizer section (17) in the internal reception unit (14) completely synchronizes a plurality of input transport streams by referencing synchronization bytes, PID, and CC values, and selects to output a TS packet having the error indicator flag not set to 1.
    Type: Application
    Filed: September 16, 2002
    Publication date: July 10, 2003
    Inventors: Yasunari Ikeda, Norishisa Shirota, Hideyuki Matsumoto
  • Publication number: 20030119444
    Abstract: Cell search synchronization in spread spectrum communications systems using primary and second synchronization codes with symbol partitioning for shorter coherent combinations (despreading) which are combined non-coherently, and Fourier transform analysis automatically adjusts for phase rotation of the despread sub-symbols.
    Type: Application
    Filed: October 30, 2002
    Publication date: June 26, 2003
    Inventor: Hirohisa Yamaguchi
  • Patent number: RE42261
    Abstract: A satellite gateway is coupled to a communications network and is operative to communicate with a communications satellite. A terrestrial terminal interface subsystem is operative to communicate with the satellite gateway via the communications satellite using a first radio interface and to communicate with terminals over a geographic area using a second radio interface. The communications network may be a wireless communications network, and the satellite gateway is configured to communicate with a base station controller of the wireless communications network, such that the terrestrial terminal interface subsystem may provide one or more satellite-linked terrestrial base stations.
    Type: Grant
    Filed: May 9, 2006
    Date of Patent: March 29, 2011
    Assignee: ATC Technologies, LLC
    Inventor: Peter D. Karabinis