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| Number | Title | Issue Date |
| 8164394 | Modulation apparatus and test apparatus Provided is a modulation apparatus that outputs an output signal having a designated amplitude and a designated phase, comprising a first variable delay section that outputs a first delayed signal obtained by delaying a periodic signal by a set delay time; a second ... | 04/24/2012 |
| 8044742 | Wideband phase modulator An apparatus for phase modulation includes a delay locked loop configured to generate from a reference signal a plurality of phase shifted signals, each of the phase shifted signals being locked to the reference signal and having a different phase shift from the oth... | 10/25/2011 |
| 8031028 | Polar signal processor to drive a segmented power amplifier and method therefore A circuit for providing AM/PM modulation is described. The circuit provides two drive signals which are later combined in a constructive/destructive fashion. The circuit provides AM modulation with a drive signal having a consistent power level modulated to have var... | 10/04/2011 |
| 8022781 | Redundancy system for a telecommunication system and related methods A redundancy system for a co-channel telecommunication system and related methods. Implementations of the redundancy system may include at least a first modulator and a second modulator having a symbol mapper coupled to a parallel bit signal. The symbol mapper may b... | 09/20/2011 |
| 7915969 | Distortion compensating circuit A distortion compensating circuit is provided in which, in the polar modulation system, while suppressing increase of compensation data and increase of the circuit scale, a modulated signal can be correctly expressed, or low-distortion characteristics of a power amp... | 03/29/2011 |
| 7915970 | Bi-phase modulator apparatus and method A bi-phase modulator including a driver and a mixer. The driver includes a prescaler having an input for receiving a signal and an output for outputting a baseband signal. The mixer includes a mixer having an input coupled to the output of the prescaler for receivin... | 03/29/2011 |
| 7902937 | Positive coefficient weighted quadrature modulation method and apparatus A differential positive coefficient weighted quadrature modulator is actuated responsive to quadrature clock signals and positive digital modulation signals input to the modulator. The modulator includes an I-channel positive coefficient weighted modulator (PCWM) an... | 03/08/2011 |
| 7898352 | Radio frequency PWM & PPM modulator The present invention relates in general to transferring the envelope information of a polar modulated signal to a varying pulsewidth signal, while the phase modulation is direct transferred to the phase modulation of this PWM signal. Accordingly, the resultant sign... | 03/01/2011 |
| 7893787 | DC offset cancellation circuit for modulator using 1-bit signal conversion A DC offset cancellation circuit used for compensating a carrier leak at an output signal of a modulator has a sign extraction unit for extracting sign of an information signal which is applied to the modulator, an envelope detecting unit for performing envelope det... | 02/22/2011 |
| 7872544 | Modulation/demodulation apparatus and modulation/demodulation method A modulation/demodulation apparatus according to an embodiment of the present invention includes a sine wave generating circuit configured to output two sine waves which are orthogonal to each other and have equal amplitude, an orthogonal modulator connected to the ... | 01/18/2011 |
| 7872545 | Jumpless phase modulation in a polar modulation environment The present disclosure relates to circuits and methods for improving the performance of a polar modulator by maintaining the input to a phase modulator. ... | 01/18/2011 |
| 7872543 | Bi-polar modulator A bi-polar modulator that can perform quadrature modulation using amplitude modulators is described. In one design, the bi-polar modulator includes first and second amplitude modulators and a summer. The first amplitude modulator amplitude modulates a first carrier ... | 01/18/2011 |
| 7839231 | Low power I/Q modulator Apparatus and methods for improving the performance of a modulator, typically in an I/Q modulation system, are described. Input I and Q current modulation signals may be processed to generate a sign signal and a magnitude signal, with the magnitude signal selectivel... | 11/23/2010 |
| 7830217 | Method and system of vector signal generator with direct RF signal synthesis and parallel signal processing A vector signal generator with direct RF signal synthesis is disclosed. The vector signal generator comprises an RF signal synthesizer, a switch, and a memory. The RF signal synthesizer is configured for converting baseband IQ signals into a modulated digital RF sig... | 11/09/2010 |
| 7804377 | Apparatus and method for producing an SBPSK-type modulated signal using piecewise linear phase transition shaping An apparatus and method for generating piecewise linear phase transitions during a phase transition interval of a first signal to control controlling the phase/frequency of a second signal. The initiation point, duration and shaping parameters of the piecewise linea... | 09/28/2010 |
| 7772936 | Polar feedback architecture Polar feedback architecture. A polar modulator, as may be implemented within a transmitter module, of a communication device includes feedback. This feedback involves monitoring of phase information and magnitude/amplitude information of an output signal generated b... | 08/10/2010 |
| 7746186 | Wideband quadrature imbalance compensation system and method Compensating for wideband quadrature imbalance error by introducing inverse complex inputs to phase quadrature estimator filters to generate estimated quadrature distortion; summing estimator quadrature distortion with a delayed version of the actual complex input t... | 06/29/2010 |
| 7737799 | Digital phase modulator and corresponding method A simple, interference-free digital phase modulator is to be provided. To this end, the phase modulator is provided with a counter for outputting a counter signal on the basis of a predetermined clock signal and a comparator, which receives a current counter state f... | 06/15/2010 |
| 7733193 | Systems and methods for DQPSK modulator control using selectively inserted dither tone DQPSK modulator control is provided using a single monitor photodiode with a selectively injected dither tone. The dither tone signal is sequentially injected into arm modulators and/or to a modulator driver port in time slots. A tapped signal at the output of the m... | 06/08/2010 |
| 7692507 | Apparatus and method of generating a plurality of synchronized radio frequency signals A plurality of RF signals are generated with the RF signals synchronized with each other with high accuracy. Transmission data of the multiple channels are modulated, the modulated data of the channels are added to produce composite data and the composite data is st... | 04/06/2010 |
| 7671691 | Quadrature modulator with phase controller apparatus and error detector A quadrature modulator divides a first signal input as a local signal into an I channel signal and a Q channel signal orthogonal to each other and outputs a second signal having a desired phase delay corresponding to direct current voltages as for the first signal b... | 03/02/2010 |
| 7671692 | Apparatus and method for compensating carrier feedthrough in quadrature modulation system The present invention relates to an apparatus and a method for compensating carrier feedthrough in a quadrature modulation system. In order to suppress the carrier feedthrough, and minimize and compensate the carrier feedthrough, differences of baseband differential... | 03/02/2010 |
| 7623000 | Hybrid linear and polar modulation apparatus The invention is directed at a hybrid modulation apparatus which combines a polar modulation circuit and a linear modulation circuit. The hybrid apparatus allows a communications device to function as a polar or a linear modulation circuit with less components as th... | 11/24/2009 |
| 7612627 | Integrated binary phase shift keying with silicon MEMS resonators A modulator includes a micro-electromechanical resonator device configured to receive an input signal and generate two output signals in response thereto, wherein the two signals having a predetermined phase relationship therebetween. The modulator further includes ... | 11/03/2009 |
| 7595702 | Modulation apparatus capable of correcting non-linearity of voltage controlled oscillator A modulation apparatus 24 comprises a monitoring section 207 operable to monitor information about a control voltage applied to a VCO 201 as control voltage information, during any period, when a low-frequency signal having a frequency within a ... | 09/29/2009 |
| 7579921 | On-off keying-7-phase shift keying modulation system and method for fiber communication A modulation system includes a modulator configured to employ a modulation mechanism on data. The mechanism includes a signal constellation configured to map sub-carriers which include a signal to be modulated. The signal constellation has a plurality of points asym... | 08/25/2009 |
| 7535310 | Distortion compensation circuit A distortion compensating circuit is provided in which, in the polar modulation system, while suppressing increase of compensation data and increase of the circuit scale, a modulated signal can be correctly expressed, or low-distortion characteristics of a power amp... | 05/19/2009 |
| 7518460 | Amplitude modulation apparatus, amplitude limiting method, and computer-readable program The present invention relates to an amplitude modulation apparatus, an amplitude limiting method, and a transmission apparatus for performing amplitude limitation on an orthogonally modulated signal. The amplitude modulation apparatus, the amplitude limiting method,... | 04/14/2009 |
| 7518459 | Harmonic-rejection modulation device A harmonic-rejection modulation device is provided, which includes a phase splitter, a low pass filter, and a modulator. Based on a square wave, the phase splitter generates a plurality of unfiltered local oscillating signals having phase angles of 0°, 30°, 90°, ... | 04/14/2009 |
| 7463108 | Active 90-degree phase shifter with LC-type emitter degeneration and quadrature modulator IC using the same An active 90-degree phase shifter with LC-type emitter (source) degeneration is provided, which is practiced in an integrated circuit. The phase shifter comprises a first differential amplifier, having one first signal output end and comprising an inductor, a first ... | 12/09/2008 |
| 7426246 | Dual layer signal processing in a layered modulation digital signal system Systems and methods for receiving layered modulation for digital signals are presented. An exemplary apparatus comprises a tuner for receiving a layered signal and producing a layered in-phase signal and a layered quadrature signal therefrom, an analog-to-digital co... | 09/16/2008 |
| 7423987 | Feeder link configurations to support layered modulation for digital signals Systems and methods are disclosed for feeder link configurations to layered modulation. One feeder link system employs feeder link spot beam to antennas in distinct coverage areas to enable frequency reuse. Another system employs narrow beam width feeder link antenn... | 09/09/2008 |
| 7417514 | Method for modulating phase or frequency in a communication system using clock division A direct division modulator is provided. The direct division modulator includes a symbol mapper converting the input data from a binary bitstream to a desired frequency deviation, such as where the frequency deviation data encodes the information from the bitstream.... | 08/26/2008 |
| 7412008 | Programmable phase mapping and phase rotation modulator and method A modulator (10) and method provides a programmable phase rotation for supporting different modulation formats and different phase rotations. The modulator (10) includes a programmable symbol counter (32) and symbol phase rotation logic (31 | 08/12/2008 |
| 7379509 | Digital intermediate frequency QAM modulator using parallel processing The digital Intermediate Frequency (IF) modulator applies to various modulation types and offers a simple and low cost method to implement a high-speed digital IF modulator using field programmable gate arrays (FPGAs). The architecture eliminates multipliers and seq... | 05/27/2008 |
| 7369819 | Digital amplitude modulation transmitter with pulse width modulating RF drive A digital amplitude modulation (AM) transmitter with pulse width modulating RF drive is presented. A plurality of RF amplifiers, each, when turned on, amplifies an applied RF drive signal by the same amount to provide a unit step RF output. An encoder supplies turn-... | 05/06/2008 |
| 7369624 | Carrier suppression type modulator with encoded modulating signals A carrier suppressed information signal modulation arrangement employs a plurality of serially coupled modulators. Each of the serially coupled modulators has a carrier input, a modulating signal input and a modulated carrier output. A carrier is applied to the carr... | 05/06/2008 |
| 7369834 | Impedance-matched IQ network for an image rejection circuit An impedance-matched IQ network includes a phase shift circuit and a back termination. The phase shift circuit includes an in-phase mixer port for receiving the in-phase signal, a quadrature-phase mixer port for receiving the quadrature phase signal, a termination p... | 05/06/2008 |
| 7366244 | Method and system for antenna interference cancellation A wireless communication system can comprise two or more antennas that interfere with one another via free space coupling, surface wave crosstalk, dielectric leakage, or other interference effect. The interference effect can produce an interference signal on one of ... | 04/29/2008 |
| 7358828 | Orthogonal modulation device, method, program, recording medium, and modulation device It is possible to calibrate an I(Q) signal without interrupting the modulation operation of an orthogonal modulation device. The orthogonal modulation device includes: an adder for outputting a pseudo noise superimposed signal obtained by adding the I(Q) signal to a... | 04/15/2008 |
