With Particular Frequency Division Or Multiplication Patents (Class 455/216)
  • Patent number: 10123280
    Abstract: The application provides a power control method and apparatus. The power control method includes: obtaining, by a transmit end of a link, bit error rate information of a receive end of the link; and if the bit error rate information does not meet a predetermined condition, adjusting a transmit power class value of the transmit end. According to the power control method and apparatus of the application, the transmit power class value of the transmit end of the link can be dynamically adjusted according to a change of a system or an external environment, thereby improving interference immunity of the link and ensuring stability and reliability of data transmission.
    Type: Grant
    Filed: September 3, 2014
    Date of Patent: November 6, 2018
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Peng Zhan, Huaping Wang
  • Patent number: 9268530
    Abstract: A property of a signal may be detected by sampling a signal and determining a scalar indicator of the samples. The samples can be transformed to create a transformed signal. A scalar indicator of the transformed signal may be determined and compared to the scalar indicator of the sample. If the comparison yields a number greater than a selected threshold value then the signal that was sampled may be deemed to include the property. A property indicator signal may be driven low or high to indicate that the signal has the property. The time and duration of time that the signal is deemed to include the property may be recorded. The recorded data may be reviewed and appropriate action may be taken.
    Type: Grant
    Filed: May 10, 2012
    Date of Patent: February 23, 2016
    Assignee: Honeywell International Inc.
    Inventors: Jiri Vass, Jiri Rojicek, Vladimir Bicik
  • Patent number: 8868650
    Abstract: Methods, devices, and products facilitate consolidating multi-user communications by redirecting calls to a multi-user device, with which multiple users can interact. A multi-user device monitors the density of users and devices within a specified distance of the multi-user device. Based at least in part on the proximity of a user, the multi-user device can designate a preferred device associated with the user and inform a multi-user-device server of the preference. The multi-user-device server provides a conference server with instructions that include contact information for the preferred devices to be used by the conference server when initiating a multi-user communication session.
    Type: Grant
    Filed: July 12, 2010
    Date of Patent: October 21, 2014
    Assignee: Sprint Communications Company L.P.
    Inventors: Raymond Emilio Reeves, Ryan Alan Wick, Wen Xue
  • Patent number: 8838053
    Abstract: Frequency multipliers having corresponding methods and multifunction radios comprise: N multipliers, wherein N is an integer greater than one; wherein the multipliers are connected in series such that each of the multipliers, except for a first one of the multipliers, is configured to mix a periodic input signal with an output of another respective one of the multipliers; wherein the first one of the multipliers is configured to mix the periodic input signal with the periodic input signal.
    Type: Grant
    Filed: April 18, 2012
    Date of Patent: September 16, 2014
    Assignee: Marvell World Trade Ltd.
    Inventors: Li Lin, Xiang Gao, Chi-Hung Lin
  • Publication number: 20140080433
    Abstract: Embodiments of the present invention provide a receiver and a receiving method of the receiver, so that monolithic integration of multiple receiving channels can be implemented. The receiver includes: a zero intermediate frequency channel, performing in-phase/quadrature (IQ) down conversion on a radio frequency signal at a first frequency band using a frequency division or frequency multiplication signal of a first oscillation signal; and a superheterodyne channel, performing down conversion on a radio frequency signal at a second frequency band using the frequency division or frequency multiplication signal of the first oscillation signal, where the first frequency band is different from the second frequency band.
    Type: Application
    Filed: November 21, 2013
    Publication date: March 20, 2014
    Applicant: Huawei Technologies Co., Ltd.
    Inventors: Zhuobiao He, Jianfeng Wu, Zhengxiang Ma
  • Patent number: 8606204
    Abstract: A transceiver is provided, comprising: a programmable waveform generator configured to generate a base signal, the programmable waveform generator including a controllable waveform generator configured to generate an initial bandwidth signal having an initial frequency bandwidth; a multiple tone generator configured to generate a plurality of tone signals, each tone signal having a different frequency; one or more bandwidth multiplying circuits; and a control circuit a controller configured to control the operation of the controllable waveform generator, the tone generator and the one or more bandwidth multiplying circuits; a transmit port configured to output the base signal; a receive port configured to accept a received signal; a 90-degree splitter configured to receive the base signal and to generate a first split signal at a 0-degree output and a second split signal at a 90-degree output, the first and second split signals being separated by 90 degrees in phase; a first-mixer configured to mix the receiv
    Type: Grant
    Filed: March 31, 2011
    Date of Patent: December 10, 2013
    Inventor: John W. McCorkle
  • Patent number: 8583170
    Abstract: Efficient carrier aggregation is enabled in a receiver employing a single frequency source, and dividing the frequency source by different frequency dividing factors to generate two or more RF LO frequencies. Received signals are down-converted to intermediate frequencies by mixing with the respective RF LO frequencies. By utilizing only a single high frequency source, embodiments of the present invention avoid spurious and injection locking issues that arise when integrating two or more frequency sources, and additionally reduce power consumption as compared to a multiple frequency source solution.
    Type: Grant
    Filed: November 3, 2009
    Date of Patent: November 12, 2013
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Lars Sundström, Stefan Andersson, Roland Strandberg
  • Patent number: 8554159
    Abstract: Representative implementations of direct FM/PM modulation and systems are disclosed describing frequency modulation or phase modulation of information onto a carrier signal using a divider that is remote from the carrier signal generation path.
    Type: Grant
    Filed: April 9, 2010
    Date of Patent: October 8, 2013
    Assignee: Intel Mobile Communications GmbH
    Inventors: Stefan van Waasen, Anna Miskiewicz, Markus Hammes
  • Patent number: 8521112
    Abstract: This invention provides an quadrature mixer which does not require a long time to adjust the amplitude value at the time of demodulation of the IQ signal. The quadrature mixer, comprising a first frequency-conversion unit that outputs a sixth signal derived by multiplying a first signal by a second and a fourth signals, a second frequency-conversion unit that outputs a seventh signal derived by multiplying the first signal by a third and a fifth signals, a first amplitude adjustment unit that outputs a eighth signal derived by multiplying the sixth signal by the third and fifth signals and a second amplitude adjustment unit that outputs a ninth signal derived by multiplying the seventh signal by the second and fifth signals.
    Type: Grant
    Filed: June 23, 2010
    Date of Patent: August 27, 2013
    Assignee: NEC Corporation
    Inventors: Masaki Kitsunezuka, Takashi Tokairin
  • Patent number: 8498351
    Abstract: A transmission apparatus used in a mobile communication system adopting a single carrier scheme in an uplink includes: multiplexing means configured to multiplex a pilot channel, a control channel, and a data channel; and transmission means configured to transmit a transmission symbol including at least the pilot channel and the control channel using the uplink. A first pilot channel used for a reception apparatus to measure channel state of the uplink is transmitted using a frequency band over a plurality of resource blocks. A second pilot channel for compensating for a channel transmitted by the uplink is transmitted by a resource block assigned to the transmission apparatus. Control channels of the transmission apparatus and the apparatus other than the transmission apparatus are orthogonalized with each other by a FDM scheme.
    Type: Grant
    Filed: October 12, 2011
    Date of Patent: July 30, 2013
    Assignee: NTT DoCoMo, Inc.
    Inventors: Teruo Kawamura, Yoshihisa Kishiyama, Kenichi Higuchi, Mamoru Sawahashi
  • Patent number: 8498347
    Abstract: A transmission apparatus used in a mobile communication system adopting a single carrier scheme in an uplink includes: multiplexing means configured to multiplex a pilot channel, a control channel, and a data channel; and transmission means configured to transmit a transmission symbol including at least the pilot channel and the control channel using the uplink. A first pilot channel used for a reception apparatus to measure channel state of the uplink is transmitted using a frequency band over a plurality of resource blocks. A second pilot channel for compensating for a channel transmitted by the uplink is transmitted by a resource block assigned to the transmission apparatus. Control channels of the transmission apparatus and the apparatus other than the transmission apparatus are orthogonalized with each other by a FDM scheme.
    Type: Grant
    Filed: April 19, 2007
    Date of Patent: July 30, 2013
    Assignee: NTT DoCoMo, Inc.
    Inventors: Teruo Kawamura, Yoshihisa Kishiyama, Kenichi Higuchi, Mamoru Sawahashi
  • Patent number: 8351367
    Abstract: A user device on a wireless network includes a receiver, a noise detector and a noise determiner. The receiver receives downlink data communications from a base station that indicates an allocation of time/frequency resource blocks at least to user devices that are communicating with the base station. The noise detector measures noise in a time/frequency resource block, comprising plural time/frequency bins, that is not allocated to one of the user devices. The noise determiner determines a level of interfering noise based on noise in the resource block that is not allocated to one of the user devices.
    Type: Grant
    Filed: March 30, 2009
    Date of Patent: January 8, 2013
    Assignee: Marvell World Trade Ltd.
    Inventors: Daniel Yellin, Adoram Erell, Ronen Mayrench, Ezer Melzer
  • Patent number: 8300621
    Abstract: The present invention relates to a method for timing acquisition and carrier frequency offset estimation of an OFDM communication system and an apparatus using the same. For this purpose the present invention provides a method for calculating at least one auto-correlation and calculating an observation value by performing a sliding sum on the at least one auto-correlation, and calculating a peak point of an absolute value of the observation as frame timing. In addition, the present invention provides a method for generating a third OFDM symbol that is generated by delaying a second OFDM symbol, calculating an observation value through the second and third OFDM symbols, and calculating a phase difference from a result of multiplication of the observation value and a conjugate complex value of the observation value such that a carrier frequency offset can be estimated.
    Type: Grant
    Filed: September 14, 2006
    Date of Patent: October 30, 2012
    Assignees: Samsung Electronics Co., Ltd, Electronics and Telecommunications Research Institute, KT Corporation, SK Telecom Co., Ltd, Hanaro Telecom, Inc.
    Inventors: Hyoung-Soo Lim, Dong-Seung Kwon
  • Patent number: 8289837
    Abstract: A wideband telecommunications device with narrow band support. The device may be a receiver having a wireless interface configured to receive combined first and second signals, the first signal having data in a first frequency band and the second signal having data in a second frequency band wider than the first frequency band, wherein the first frequency band is within the second frequency band. The receiver may also be a processing system configured to recover the data in the first signal from the combined first and second signals.
    Type: Grant
    Filed: May 2, 2008
    Date of Patent: October 16, 2012
    Assignee: QUALCOMM Incorporated
    Inventors: Beomsup Kim, Charles J. Persico
  • Patent number: 8280331
    Abstract: A device is provided for dividing a clock signal by even and odd integers. The device includes a divider, a delay portion and a duty cycle corrector. The divider is arranged to receive the clock signal and can divide the clock signal and output a divided clock signal. The delay portion can output a delayed signal based on the divided clock signal. The duty cycle corrector can output a first signal based on the delayed signal and the divided clock signal.
    Type: Grant
    Filed: November 12, 2009
    Date of Patent: October 2, 2012
    Assignee: Texas Instruments Incorporated
    Inventors: Krishnasawamy Nagaraj, Neeraj Nayak
  • Patent number: 8249535
    Abstract: A radio receiver comprises an input (14) for a modulated radio frequency signal, a frequency down converter (16) coupled to the input, the frequency down converter including quadrature mixers (32,34) for demodulating a received modulated radio frequency signal using a local oscillator signal. An analogue-to-digital converter (54, 56) is coupled to receive demodulated signals from the mixing means. The analogue-to-digital converter, which may comprise a continuous time sigma delta converter, has an input for a sampling clock frequency (f s). A voltage controlled oscillator (38) provides the local oscillator signal and supplies a frequency divider (60, 94) used to provide the sampling clock frequency.
    Type: Grant
    Filed: January 20, 2009
    Date of Patent: August 21, 2012
    Assignee: NXP B.V.
    Inventors: Timothy J. Ridgers, Yann Le Guillou, Fernand Courtois
  • Patent number: 8243629
    Abstract: Devices that are enabled to communicate with each other via an ad hoc conference mode and an infrastructure supported conference mode, are provided with processing capabilities that can allow them to evaluate one or more resources required to support an ad hoc conference communication session and/or one or more quality metrics associated with the ad hoc conference communication session, and determine whether one or more resources or metrics are outside optimal operating parameters. If so, the processing logic can initiate a transition from the ad hoc conference communication session to an infrastructure supported conference communication session hosted at a conference server.
    Type: Grant
    Filed: July 21, 2009
    Date of Patent: August 14, 2012
    Assignee: Symbol Technologies, Inc.
    Inventors: Patrick Stephen, Greg Dykes, Richard Joyner, Yi-Cheng Liu, Edgardo Promenzio
  • Patent number: 8237870
    Abstract: Disclosed is a receiver system, capable of receiving RF signals on television channels of multiple bandwidths. The receiver system includes a tuner, an analog IF filter, an ADC, a mixer module, one or more digital filters, an AGC module and a controller. The tuner converts an RF signal into an IF signal using a mixer frequency. The analog IF filter filters out a fixed band signal from the IF signal. The ADC module converts the fixed band signal into a digital signal, which is filtered by digital filters. The output of the digital filters is converted to a base band signal and the power level of the base band signal is controlled by the AGC module. The controller selects a mixer frequency from a group of mixer frequencies based on a function of power of the output of the AGC module by applying each mixer frequency to the tuner.
    Type: Grant
    Filed: September 28, 2007
    Date of Patent: August 7, 2012
    Assignee: Intel Corporation
    Inventors: Parveen K Shukla, Bernard Arambepola, Thushara Hewavithana
  • Patent number: 8228950
    Abstract: A method for detecting and/or estimating a ranging signal in a wireless communications network, wherein the ranging signal comprises a plurality of tiles. The method includes (i) for two or more of the plurality of tiles, carrying out a plurality of mathematical correlations for one or more of the plurality of tiles but less than all of the plurality of tiles products between subcarriers, wherein at least one of the plurality of products is carried out between non-adjacent subcarriers associated with one of the two or more of the plurality of tiles; (ii) summing the results of the correlations products, thereby obtaining mathematical correlations that make up summed results; and (iii) based on the summed results, detecting a code characterizing the ranging signal and/or estimating the timing offset of the ranging signal.
    Type: Grant
    Filed: September 18, 2006
    Date of Patent: July 24, 2012
    Assignee: Alvarion Ltd.
    Inventors: Dan Stopler, Tal Kaitz, Yaniv Bar
  • Patent number: 8116708
    Abstract: A wireless receiver that includes a reception unit which, in the case in which the frequency bandwidth of the chunk is Fc, receives a) data to which phase rotation for controlling the maximum delay time between the plurality of transmission antennas is added so that the maximum delay time is set to either a predetermined first value which is smaller than 1/Fc or a predetermined second value which is larger than 1/Fc depending on whether transmission is performed using frequency diversity or transmission is performed using multi-user diversity and b) pilot channels corresponding to the plurality of transmission antennas which are orthogonal to each other; and a demodulating unit which demodulates the data based on transfer functions calculated using the pilot channels.
    Type: Grant
    Filed: January 25, 2010
    Date of Patent: February 14, 2012
    Assignee: Sharp Kabushiki Kaisha
    Inventor: Kimihiko Imamura
  • Patent number: 8077659
    Abstract: Estimating a current location of a receiver in a MediaFLOâ„¢ (Forward Link Only) mobile multimedia multicast system comprises receiving digital signals comprising a MediaFLOâ„¢ superframe comprising orthogonal frequency division multiplexing (OFDM) symbols; performing slot 3 processing of each medium access control (MAC) time unit of a data channel to identify a transmitter identity (TxID) of each transmitter; identifying corresponding geographical coordinates of each TxID; regenerating the digital signals for each of the transmitters using a local-area differentiator (LID) and a wide-area differentiator (WID) of the transmitters; dividing the digital signals by the corresponding regenerated transmitted signal to obtain channel estimates between the receiver and the corresponding transmitters; detecting a first peak in the channel estimates to determine a distance between the receiver and the corresponding transmitters; calculating a time difference of arrival of the digital signals; and estimating a current loca
    Type: Grant
    Filed: April 28, 2008
    Date of Patent: December 13, 2011
    Assignee: Newport Media, Inc.
    Inventor: Nabil Yousef
  • Patent number: 8055224
    Abstract: A wireless receiver that includes a reception unit which, in the case in which the frequency bandwidth of the chunk is Fc, receives a) data to which phase rotation for controlling the maximum delay time between the plurality of transmission antennas is added so that the maximum delay time is set to either a predetermined first value which is smaller than 1/Fc or a predetermined second value which is larger than 1/Fc depending on whether transmission is performed using frequency diversity or transmission is performed using multi-user diversity and b) pilot channels corresponding to the plurality of transmission antennas which are orthogonal to each other; and a demodulating unit which demodulates the data based on transfer functions calculated using the pilot channels.
    Type: Grant
    Filed: January 25, 2010
    Date of Patent: November 8, 2011
    Assignee: Sharp Kabushiki Kaisha
    Inventor: Kimihiko Imamura
  • Patent number: 8036303
    Abstract: A transmitter apparatus capable of reducing the distortions of vector modulated waves. This apparatus includes variable coefficient filters (110,112) in a stage preceding an amplitude signal voltage generating part (104) and also includes variable coefficient filters (111,113) in a stage preceding a phase modulated wave generating part (105). These variable coefficient filters (110-113) are used to perform a pulse shaping, thereby adjusting the delay between an amplitude component modulated signal (r(t)) and a phase component modulated signal (SC(t)) whereby a resolution, which is finer than the sampling period of a signal processing, can be used to adjust the delay time difference between the amplitude component modulated signal (r(t)) and the phase component modulated signal (SC(t)). As a result, the distortions of vector modulated waves (Srf(t)) can be reduced to a sufficiently small level.
    Type: Grant
    Filed: December 15, 2006
    Date of Patent: October 11, 2011
    Assignee: Panasonic Corporation
    Inventor: Tatsuto Oka
  • Patent number: 7983637
    Abstract: An amplifier includes: an input terminal configured to have an input signal of a center frequency f0 input; a dividing unit that divides the input signal; first through ith blocks configured to have the divided input signal transmitted; a combining unit that combines signals transmitted through the blocks; and an output terminal that outputs the signals combined by the combining unit. The nth block includes a nth former-stage resonator having a fundamental resonant frequency fn, a nth amplifying unit, a nth latter-stage resonator having the fundamental resonant frequency fn, and a nth phase adjusting unit. Each latter-stage resonator having a harmonic resonant frequency either fa or fb, satisfies relationship fa<2f1, fb>2f1, (fa+fb)/2=2f0 The phase adjusting unit is configured to reverse the phase of signals passing adjacent blocks and maintain all phase differences among signals of 2fn passing through the nth block in the coordinate-phase.
    Type: Grant
    Filed: September 23, 2008
    Date of Patent: July 19, 2011
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Hiroyuki Kayano
  • Patent number: 7929929
    Abstract: A frequency synthesizer includes: a frequency source generating a reference signal that includes a plurality of pulses having periodicity based on a reference frequency; a feedback loop that includes, a phase detector circuit, a loop filter, a controlled oscillator that generates an output signal at an output, and a loop divide circuit; a non-linear circuit element at an input of the phase detector circuit, which generates intermodulation distortion that causes at least one spurious signal at the output; and a controller controlling the loop divide circuit and the non-linear circuit element. The frequency synthesizer further includes a dither circuit that adjusts the timing of some of the pulses of the reference signal based on a parameter provided by the controller to the non-linear circuit element, thereby, providing a jittered reference signal to the non-linear circuit element for attenuating the at least one spurious signal at the output.
    Type: Grant
    Filed: September 25, 2007
    Date of Patent: April 19, 2011
    Assignee: Motorola Solutions, Inc.
    Inventors: Paul H. Gailus, John J. Bozeki, Joseph A. Charaska, Vadim Dubov, Manuel P. Gabato, Jr., Armando J Gonzalez
  • Patent number: 7894784
    Abstract: A wireless receiver that includes a reception unit which, in the case in which the frequency bandwidth of the chunk is Fc, receives a) data to which phase rotation for controlling the maximum delay time between the plurality of transmission antennas is added so that the maximum delay time is set to either a predetermined first value which is smaller than 1/Fc or a predetermined second value which is larger than 1/Fc depending on whether transmission is performed using frequency diversity or transmission is performed using multi-user diversity and b) pilot channels corresponding to the plurality of transmission antennas which are orthogonal to each other; and a demodulating unit which demodulates the data based on transfer functions calculated using the pilot channels.
    Type: Grant
    Filed: January 25, 2010
    Date of Patent: February 22, 2011
    Assignee: Sharp Kabushiki Kaisha
    Inventor: Kimihiko Imamura
  • Patent number: 7826811
    Abstract: A two-point modulation type phase apparatus and a wireless communication apparatus capable of achieving a reduction in circuit scale and low power consumption while maintaining modulation precision.
    Type: Grant
    Filed: November 9, 2006
    Date of Patent: November 2, 2010
    Assignee: Panasonic Corporation
    Inventors: Hiroyuki Yoshikawa, Shunsuke Hirano
  • Publication number: 20100255802
    Abstract: An FM radio with a wide frequency range operates in a cell phone without interfering with the VCO of the RF transceiver. The FM transceiver generates a VCO signal whose frequency varies by less than ±7% from the midpoint of a narrow first range. A synthesizer signal is generated by dividing the VCO frequency by a first divisor such that the synthesizer frequency varies over a lower frequency second range. The VCO frequency is also divided by a second divisor such that the synthesizer frequency varies over a third range. The upper limit of the second range falls at the lower limit of the third range. The lower limit of the second range is 85.5 MHz and the upper limit of the third range is 108.0 MHz. By also using a third divisor, a synthesizer signal with a range of 76-108 MHz is generated from the narrow first frequency range.
    Type: Application
    Filed: April 2, 2009
    Publication date: October 7, 2010
    Applicant: QUALCOMM Incorporated
    Inventors: Tzu-wang Pan, Yi Zeng, I-Hsiang Lin, Pushp K. Trikha, Jeremy D. Dunworth, Rahul Apte
  • Patent number: 7664475
    Abstract: A multi-band wireless transceiver having a plurality of signal-processing paths, and further having a function of making wireless communication through a plurality of frequency bands by selecting one of the signal-processing paths, includes a band identification circuit for identifying a frequency band, the band identification circuit identifying a frequency band in dependence on a frequency-band information received from a controller which controls an operation of the multi-band wireless transceiver, and selecting one of the signal-processing paths in accordance with the identified frequency band.
    Type: Grant
    Filed: September 6, 2005
    Date of Patent: February 16, 2010
    Assignee: NEC Corporation
    Inventor: Masaki Ichihara
  • Publication number: 20090149144
    Abstract: An apparatus amplifies RF signals in a communication system by using a first directional coupler having at least two inputs and at least two outputs; at least two RF amplifiers, where an input of each RF amplifier is connected to a different one of the at least two outputs of the first directional coupler; and a second directional coupler having at least two inputs and at least two outputs, where each one of the at least two inputs is connected to an output of a different one of the at least two RF amplifiers. The at least two outputs of the second directional coupler are connected to at least two antennas, respectively.
    Type: Application
    Filed: December 6, 2007
    Publication date: June 11, 2009
    Applicant: MOTOROLA, INC.
    Inventors: Yuda Yehuda Luz, Jiangnan Jason Chen
  • Patent number: 7529533
    Abstract: The embodiments of the present invention provide a configurable homodyne/heterodyne RF receiver including first and second mixers. The configurable homodyne/heterodyne RF receiver functions as a homodyne receiver when the first and second mixers are configured to operate in parallel, and as a heterodyne receiver when the first and second mixers are configured to operate in series. The embodiments of the present invention further provides an RFID reader employing the configurable homodyne/heterodyne RF receiver to facilitate a listen-before-talk function.
    Type: Grant
    Filed: November 15, 2005
    Date of Patent: May 5, 2009
    Assignee: TriQuint Semiconductor, Inc.
    Inventor: John Vincent Bellantoni
  • Patent number: 7430247
    Abstract: Carrier frequency detection for an N-ary modulated signal is achieved by digitizing the N-ary modulated signal, frequency shifting the digitized N-ary modulated signal to prevent aliasing, raising the frequency-shifted signal to the Nth power, transforming the raised signal to frequency domain data and determining an initial maximum frequency peak, iteratively fine shifting the frequency of the N-ary modulated signal around the initial maximum frequency peak and repeating the raising, transforming and determining steps to obtain a plurality of maximum frequency peaks, and calculating the carrier frequency from the maximum frequency peaks and the total related frequency shift.
    Type: Grant
    Filed: January 13, 2005
    Date of Patent: September 30, 2008
    Assignee: Tektronix, Inc.
    Inventor: Koichi Yoshihara
  • Patent number: 7379723
    Abstract: In one embodiment, a local oscillator and mixer architecture may include a frequency divider having I and Q channel master storage elements formed of devices of a first size, and I and Q channel slave storage elements formed of devices of a second size, where the second size is smaller than the first size. In such manner, power consumption may be reduced while reducing phase noise in signals provided from the frequency divider to the corresponding mixer.
    Type: Grant
    Filed: July 29, 2004
    Date of Patent: May 27, 2008
    Assignee: Silicon Laboratories Inc.
    Inventor: Aslam Rafi
  • Patent number: 7356318
    Abstract: A quadrature subharmonic mixer comprises a polyphase filter configured to generate quadrature components of a local oscillator (LO) reference signal, a summing and scaling element configured to create additional components of the LO reference signal, and a plurality of mixer elements configured to multiply the quadrature components of the LO reference signal and the additional components of the LO reference signal with a radio frequency (RF) signal to obtain a downconverted version of the RF signal.
    Type: Grant
    Filed: July 2, 2004
    Date of Patent: April 8, 2008
    Assignee: Skyworks Solutions, Inc.
    Inventor: Tirdad Sowlati
  • Patent number: 7340233
    Abstract: An integrated circuit may include a receiver and/or a transmitter that performs third order sub-harmonic conversion. The integrated circuit may include a Gilbert cell active mixer with three or more serially-connected transistors in each of the mixer's four branches. Alternatively, the integrated circuit may include a quad-ring passive resistive mixer with three or more serially-connected transistors in each of the mixer's four branches. Alternatively, the integrated circuit may include a logic circuit and a mixer. The logic circuit may apply logic operations to periodic logic signals having a local frequency and to delayed versions thereof to produce reference signals having a dominant spectral component at three times the local frequency. The mixer may mix input signals with the reference signals to produce output signals having a dominant spectral component at three times the local frequency less a center frequency of the input signals.
    Type: Grant
    Filed: March 29, 2004
    Date of Patent: March 4, 2008
    Assignee: Intel Corporation
    Inventors: Yair Shemesh, Shai Gross, Tzvi Maimon
  • Patent number: 7177609
    Abstract: A chopper-direct-conversion (CDC) radio receiver includes a phase-alternating mixer receiving an antenna input signal and at least one local oscillator signal and generating a double sideband signal in a single mixing step. The phase-alternating mixer may be implemented by two parallel mixers each mixing the input signal with one of two local oscillator signals and an adder receiving and summing outputs from the two parallel mixers, by a track-and-hold circuit sampling the input signal based upon the local oscillator signal, or by a window averaging circuit averaging the input signal across a period of the local oscillator signal. The CDC architecture is suitable for fabrication on a single chip and offers solutions to virtually all problems found in conventional direct-conversion receivers.
    Type: Grant
    Filed: May 16, 2003
    Date of Patent: February 13, 2007
    Assignee: National Semiconductor Corporation
    Inventor: Hee Wong
  • Patent number: 7164896
    Abstract: Whenever the oscillator frequency is a fraction or a multiple of the received frequency, another received frequency could in turn be there, which would then work as a kind of received disturbance frequency, and thus oscillator pulling occurs, which then severely impairs evaluation of the received signal. The method according to the invention for driving a receiver stage having a selection means, having a control unit and an oscillator is distinguished by the fact that the selection means is driven such that whenever the oscillator frequency is a fraction or a multiple of a received disturbance frequency, this received disturbance frequency is attenuated by the selection means.
    Type: Grant
    Filed: November 5, 2002
    Date of Patent: January 16, 2007
    Assignee: Thomson Licensing
    Inventors: Herbert Peusens, Klaus Clemens
  • Patent number: 7103115
    Abstract: In various embodiments, techniques are provided to determine channel characteristics of various communication systems such as OFDM systems or systems using a plurality of transmit antennas by using various sets of training symbols that produce zero cross-correlation energy. Channel communication can accordingly be simplified as the zero cross-correlation property allows for channel estimation without a matrix inversion.
    Type: Grant
    Filed: May 21, 2001
    Date of Patent: September 5, 2006
    Assignee: AT&T Corp.
    Inventor: Ye Li
  • Patent number: 7085549
    Abstract: A zero intermediate frequency (ZIF) radio frequency (RF) digital mixer (200) includes a low noise amplifier (LNA) (203), a first RF mixer stage (205) for mixing an RF signal from the at least one LNA with a first local oscillator signal operating a first predetermined frequency. A second RF mixer stage (207) is then utilized for mixing in-phase (I) and quadrature (Q) digital signals from the first RF mixer stage (205) with a plurality of second local oscillator signals (LO) operating at a second predetermined frequency. The invention significantly improves current drain by eliminating the need for a linear transconductance stage while still maintaining high degrees of isolation and linearity.
    Type: Grant
    Filed: December 30, 2002
    Date of Patent: August 1, 2006
    Assignee: Motorola, Inc.
    Inventors: Vance H. Peterson, Daniel Edward Brueske
  • Patent number: 7023937
    Abstract: A receiver window design algorithm (210) is developed which minimizes the noise power of the demodulated multicarrier signal. The windows are effective on a variety of different channels and noise sources. Receiver windowing is a computationally efficient technique for reducing noise spreading in multicarrier communication systems.
    Type: Grant
    Filed: March 1, 2001
    Date of Patent: April 4, 2006
    Assignee: Texas Instruments Incorporated
    Inventor: Arthur John Redferm
  • Patent number: 7024171
    Abstract: Frequency synthesizer utilizing fractional-N synthesis includes a phase detector having an input receivable of a reference frequency, a loop filter arranged to receive the signal from the phase detector, a tunable oscillator arranged to receive a tuning signal generated by the loop filter and provide an output frequency and an integer divider arranged to receive the output frequency of the oscillator, divide it by a division control number (N+F) and provide the divided output frequency to the phase detector. The division control number is made up of an integer (N) and a fraction portion (F) separated into at least two different fractions. The fraction portion is generated by at least two sigma-delta converters, each processing a respective fraction with the sigma-delta converter processing a smaller fraction being driven at a lower clock rate than a sigma-delta converter processing the largest fraction.
    Type: Grant
    Filed: February 25, 2003
    Date of Patent: April 4, 2006
    Assignee: ICOM America, Incorporated
    Inventor: John Gibbs
  • Patent number: 6973304
    Abstract: A multimode service radio communication apparatus, that provides a hand-held or vehicle-mounted terminal with radio communication and radio broadcasting information of a radio information and communication providing system including mobile communication systems and intelligent transport systems, includes a frequency division multiplexer that integration-converts individual radio or intermediate frequencies modulated for mobile telephones and broadcasts so that the modulated frequencies are included in a specific frequency band, and produces radio signals in the specific frequency band; supply device for supplying the radio signals; an antenna for receiving and transmitting the supplied radio signals; a shared antenna for receiving the transmitted radio signals; and terminals to which specific frequencies in the specific frequency band are selectively linked.
    Type: Grant
    Filed: April 17, 2002
    Date of Patent: December 6, 2005
    Assignee: National Institute of Information and Communications Technology Incorporated Administrative Agency
    Inventors: Masayuki Fujise, Hiroshi Harada
  • Patent number: 6845083
    Abstract: A transmitter 108 converts a digital baseband signal input 150 for transmission by an antenna 114 to support multiple communication standards. An over-deviation phase multiplier 130 increases signal phase deviation by a factor of M. A digital phase modulator 176 applies trigonometric lookup tables. A digital intermediate frequency up-converter 132 up-shifts frequencies of desired signal content. First and second digital-to-analog converters (DACs) 134 and 136 use relatively low-bit operations, which add DAC noise 212. First and second low pass filters 138 and 140 apply rejection above frequencies of desired signal content. An analog I/Q modulator 142 converts from complex to real signals, adding an unwanted signal spaced from the desired signal content by an intermediate frequency multiple. A limiter 144 reduces amplitude modulated noise. An over-deviation phase divider 146 divides signal phase deviation by 1/M to reduce phase modulated noise.
    Type: Grant
    Filed: February 3, 2003
    Date of Patent: January 18, 2005
    Assignee: Qualcomm Incorporated
    Inventors: Steven M. Mollenkopf, Puay Hoe Andrew See, Brett C. Walker
  • Patent number: 6788922
    Abstract: A radio FM receiver is provided with a voltage-controlled oscillator which can be connected via a frequency 2-divider to a quadrature combination circuit for transforming down the frequencies of received radio signals and for supplying quadrature output signals. The receiver is further provided with detection and sound reproduction circuitry connected to this combination circuit. A frequency 3-divider is also present as well as a switching circuit for selectively connecting the mixer element to the oscillator either through the 2-divider or through the 3-divider.
    Type: Grant
    Filed: January 17, 2001
    Date of Patent: September 7, 2004
    Assignee: Koninklijke Philips Electronics N.V.
    Inventor: Wolfdietrich Georg Kasperkovitz
  • Patent number: 6766178
    Abstract: A multi-band RF architecture including a GSM quadrature modulator for modulating an intermediate frequency (IF) wherein the frequency of the modulated IF signal is changed such that each of the GSM, DCS 1800, and PCS 1900 bands have a respective IF. An intermediate frequency (IF) filter with a pass band that covers the GSM IF, the DCS 1800 IF, and the PCS 1900 IF is connected to the output of the modulator and outputs to a transmit phase lock loop, which translates the IF signal from the IF filter to either a GSM band radio frequency signal, a DCS 1800 band radio frequency signal, or a PCS 1900 band radio frequency signal, depending on the frequency of a local oscillator (LO). The receiver employs a down converter which provides a down converted output signal selected by high side injection for the GSM band an by low side injection for the DCS 1800 and PCS 1900 bands.
    Type: Grant
    Filed: August 31, 1999
    Date of Patent: July 20, 2004
    Assignee: Skyworks Solutions, Inc.
    Inventors: Morten Damgaard, Leo Li
  • Publication number: 20040087291
    Abstract: An ultra-wideband transmitter and receiver, and a ultra-wideband wireless communication method, which perform ultra-wideband wireless communication by a low-speed digital circuit having a low power consumption and controlling the effect of a multi-pass. In ultra-wideband transmitter, delay time controller generates and inputs a periodic pulse to a first matched filter, outputs the periodic pulse to a second matched filter when data to be transmitted are at a first level of a binary logic level, and outputs the periodic pulse to a third matched filter when the data to be transmitted are at a second level of the binary logic level. The first matched filter receives the periodic pulse from the delay time controller and outputs a reference signal for data determination the second matched filter receives the periodic pulse from the delay time controller and outputs a first data signal earlier than the reference signal by a predetermined time.
    Type: Application
    Filed: September 9, 2003
    Publication date: May 6, 2004
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventor: Yoshio Wada
  • Patent number: 6731176
    Abstract: The present invention provides a synthesizer having an efficient lock detect signal generator, an extended range VCO that can operate within any one of a plurality of adjacent characteristic curves defined by a plurality of adjacent regions, and a divide circuit implemented using only a single counter along with a decoder. This allows for a method of operating the synthesizer, methods of establishing or reestablishing a lock condition using the extended range VCO, and a method of designing a plurality of divide circuits which each use the same single counter and each use a different decoder.
    Type: Grant
    Filed: March 13, 2002
    Date of Patent: May 4, 2004
    Assignee: Atheros Communications, Inc.
    Inventors: David K. Su, Chik Patrick Yue, David J. Weber, Masound Zargari
  • Publication number: 20030194979
    Abstract: A method for power control in an ultra wideband impulse radio system includes: (a) transmitting an impulse radio signal from a first transceiver; (b) receiving the impulse radio signal at a second transceiver; (c) determining at least one performance measurement of the received impulse radio signal; and (d) controlling output power of at least one of the first transceiver and the second transceiver in accordance with the at least one performance measurement.
    Type: Application
    Filed: April 8, 2003
    Publication date: October 16, 2003
    Inventors: James L. Richards, Larry W. Fullerton, Ivan A. Cowie
  • Publication number: 20030139158
    Abstract: A high frequency super regenerative direct detector includes a power supply and a signal detecting circuit arrangement electrically connected thereto. The signal detecting circuit arrangement, which is a transistor control system, includes a high frequency by-pass circuit, a LC tank circuit configured to be tuned at a pre-tuned frequency and to receive an incoming signal so as to generate an oscillator frequency, ranging from 800 MHz to 960 MHz, a quenching circuit coupling with the high frequency by-pass circuit to generate a quenching frequency, and a transistor circuit device configured to incorporate the oscillator frequency into the quenching frequency in such a manner that when the incoming signal matches the pre-tuned frequency a timing to achieve a saturated level of the quenching frequency is faster than no signal period, and a modulation frequency of the incoming signal is detected out from the signal detecting circuit arrangement.
    Type: Application
    Filed: January 18, 2002
    Publication date: July 24, 2003
    Inventor: Iu Peng Kan
  • Patent number: 6564045
    Abstract: An LO generation circuit generates an LO signal by doubling and quadrupling the frequency of a VCO signal. The frequency doubling and quadrupling provides high VCO-RF isolation as well as suppression of spurious noise signals in the LO output. The frequency doubler takes a quadrature signal input and utilizes mixer cores having double balanced transistor pairs to provide an output signal having doubled frequency but maintaining the phase balance of the input signal.
    Type: Grant
    Filed: December 14, 1999
    Date of Patent: May 13, 2003
    Assignee: Conexant Systems, Inc.
    Inventor: Bert Fransis