Quotables
"That’s an amazing invention, but who would ever want to use one of them?"
President Rutherford B. Hayes ; Said in 1876, after Alexander Graham Bell demonstrated the telephone to him at the White House
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 7885360 | Wireless communication apparatus and receiving method A wireless communication apparatus receives an quadrature modulated signal, generate a local signal having a frequency different from a center frequency of the quadrature modulated signal, performs quadrature demodulation on the quadrature modulated signal by using ... | 02/08/2011 |
| 7848460 | Interference suppression method and apparatus A composite baseband signal includes a desired signal component modulated according to a first modulation scheme and an interfering signal component modulated according to a second modulation scheme. Information is recovered from the composite signal by applying a p... | 12/07/2010 |
| 7835468 | Impulse detection and reduction in a frequency modulation radio receiver A radio receiver includes a processing unit that may generate a respective phase value corresponding to each of a plurality of digital samples of a received complex frequency modulation (FM) signal. The receiver also includes an impulse unit that may detect whether ... | 11/16/2010 |
| 7804918 | Apparatus for independently extracting streams from hierarchically-modulated signal and performing soft-decision, and method thereof An apparatus for independently extracting streams from a hierarchically-modulated signal and performing a soft-decision, and a method thereof are provided. The apparatus includes: a synchronizing unit for receiving a hierarchically-modulated signal configured of an ... | 09/28/2010 |
| 7796708 | Adaptive receiver loops with weighted decision-directed error A method for communication using a modulation scheme defined in a signal space includes determining demodulation confidence levels at a plurality of points distributed over the signal space. Weights are assigned to the respective points responsively to the demodulat... | 09/14/2010 |
| 7792220 | Demodulator system and method A demodulator system and method is disclosed. In an embodiment, the demodulator system can include a Coordinate Rotation Digital Computer (CORDIC) mixer to mix a first signal substantially to baseband using a first input frequency and to mix a second signal substant... | 09/07/2010 |
| 7787571 | Method for the higher-order blind demodulation of a linear waveform transmitter Process for the blind demodulation of a linear waveform source or transmitter in a system comprising one or more sources and an array of sensors and a propagation channel. The process comprises at least the following steps: the sym... | 08/31/2010 |
| 7782983 | Method and system for demodulation of a differential Loran C signal A system for demodulation of the Loran Data Channel transmitted over the Enhanced Loran (eLoran) system including a quadrature filter. The quadrature filter calculates the real and quadrature phase components of a received ninth pulse. The resultant components are u... | 08/24/2010 |
| 7756222 | Adaptive quantization method and apparatus for an OFDM receiver A quadrature frequency division multiplexing (“OFDM”) wireless receiver, including methods and devices for adaptive quantization of OFDM signals according to modulation and coding schemes and sub-carrier frequency responses, is provided. Efficient quantization m... | 07/13/2010 |
| 7751500 | Method of selecting demodulation scheme and digital broadcast receiver using the same A method and apparatus for efficiently selecting a demodulation scheme for a particular channel in a digital broadcast receiver supporting a plurality of demodulation schemes are provided. The method includes receiving the digital broadcast signal of the channel; at... | 07/06/2010 |
| 7733984 | Implementing phase rotator circuits with embedded polyphase filter network stage A method for implementing phase rotator circuits and phase rotator circuit of the invention includes a polyphase filter network to create a quadrature phase version of the input signal. The polyphase filter network is partitioned into a first part that is physically... | 06/08/2010 |
| 7729454 | Method and system for signal phase variation detection in communication systems Aspects of a method and system for signal phase variation detection in communication systems are presented. Aspects of the system may enable detection of phase change between a current received symbol, and one or more previous received symbols. Based on the phase ch... | 06/01/2010 |
| 7715498 | Wireless communication method and apparatus for performing post-detection constellation correction A method and apparatus for correcting the phase and gain of data associated with a constellation pattern of a plurality of received individual symbols. Each symbol is divided into real and imaginary symbol components. The signs of the real and imaginary symbol compo... | 05/11/2010 |
| 7706476 | Real-time digital quadrature demodulation method and device for ultrasonic imaging system A real-time digital quadrature demodulation method and device for the ultrasonic imaging system are disclosed in this invention. In addition to a multiplying step and a filtering step, the method further comprises a sine and cosine table generating step for generati... | 04/27/2010 |
| 7706475 | Compensation of I/Q mismatch in a communication system using I/Q modulation A communications system is provided that includes a detector that has I/Q mismatch, a calibration circuit that estimating a phase and/or an amplitude mismatch of the detector, and a compensation circuit that uses the estimated phase and/or amplitude mismatch to miti... | 04/27/2010 |
| 7702039 | Radio receiver for receiving digital radio signals and method for receiving digital radio signals A radio receiver for receiving digital radio signals and a method for receiving digital radio signals are used for undertaking the conversion of digital audio signals to a preset clock pulse rate or clock pulse regulation. The digital asynchronous sampling rate conv... | 04/20/2010 |
| 7697636 | Process for automatic correction of the spectral inversion in a demodulator and device to implement the process A process of correction of the spectral inversion for a receiver in a digital communication system: the process allows the reception in the receiver of a training sequence presumably known according to a modulation of type π/2 BPSK or MDP2. The process includes the... | 04/13/2010 |
| 7688917 | Configurable all-digital coherent demodulator system for spread spectrum applications A configurable all-digital coherent demodulator system for spread spectrum digital communications is disclosed herein. The demodulator system includes an extended and long-code demodulator (ELCD) coupled to a traffic channel demodulator (TCD) and a parameter estimat... | 03/30/2010 |
| 7649962 | Phase error correction circuit A phase error correction circuit includes a complex phase rotator for multiplying an input VSB (vestigial-sideband) signal by a phase correction signal and outputting a resultant signal, a specific frequency component elimination filter for eliminating a specific fr... | 01/19/2010 |
| 7639757 | Pulse modulator and pulse modulation method A pulse modulator has a subtraction stage that produces a control error signal from the difference between a complex input signal and a feedback signal. A signal conversion stage converts the control error signal to a control signal. The control signal is multiplied... | 12/29/2009 |
| 7627060 | Receiver and method having envelope compensation signal In some embodiments, methods and apparatus to reduce nonlinearity in a receiver are generally described herein. Other embodiments may be described and claimed. ... | 12/01/2009 |
| 7627059 | Method of robust timing detection and carrier frequency offset estimation for OFDM systems A symbol detector for an OFDM receiver determines the correlation of corresponding samples of at least two received preamble symbol samples, one of the samples delayed a predetermined duration with respect to the other; determines a timing metric based on the correl... | 12/01/2009 |
| 7623595 | Digital technique of compensating mismatches between in phase and quadrature channels Methods and systems for filtering an input signal include receiving a first demodulated signal produced by multiplying a first generated signal with a received input signal, receiving a second demodulated signal produced by multiplying a second generated signal with... | 11/24/2009 |
| 7606330 | Dual-rate single band communication system A system, method, and apparatus for a multiple data rate communication system is presented herein. The communication system receives data samples that are either sampled at a narrowband rate or a wideband rate and provides various functions and services, such as ech... | 10/20/2009 |
| 7599449 | Hybrid modulus blind equalization for quadrature amplitude modulation (QAM) receivers Methods and apparatuses for blind equalizers with a hybrid adaptation error. In one embodiment, a Quadrature Amplitude Modulation (QAM) signal receiver, includes: a filter to reduce error in equalization, the filter to output a QAM signal; a decision engine coupled ... | 10/06/2009 |
| 7593486 | Apparatus and method for controlling transmission mode in a MIMO mobile communication system An apparatus and method for controlling a transmission mode in a MIMO mobile communication system are provided. In a receiver in the MIMO mobile communication system, an error checker checks errors in received data and outputting an error check result. A feedback po... | 09/22/2009 |
| 7580480 | Demodulation method using soft decision for quadrature amplitude modulation and apparatus thereof In a soft decision method for demodulation of a received square QAM (Quadrature Amplitude Modulation) signal, the processing speed is improved, and the manufacturing expense is reduced, by using condition probability vector values, which are soft decision values. A ... | 08/25/2009 |
| 7580481 | I/Q timing mismatch compensation Timing correction is affected for mismatch between channels in an I/Q demodulator. The respective demodulated I-channel and Q-channel are correlated and integrated so generate a timing control signal that is applied to a variable delay element. The variable delay el... | 08/25/2009 |
| 7570716 | Data carrier provided with at least two decoding stages In a data carrier (1) which includes receiving means (5) for receiving a modulated carrier signal (MTS) which contains a data signal (DS1) encoded in conformity with an encoding method (MA, PW, MI, RTZ, FSK, PSK), demodulation means (9) f... | 08/04/2009 |
| 7561638 | Demodulation apparatus and receiving apparatus 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 si... | 07/14/2009 |
| 7558339 | Asynchronous ZCD demodulator/decoder There is provided a detector for extracting binary data frequency-modulated on a carrier signal. An axes generator produces M pairs of logic signals, the logic signals of the same pair being in quadrature. The decoder includes M asynchronous logic zero-crossing dete... | 07/07/2009 |
| 7492837 | Parameter estimation for adaptive antenna system There is proposed a technique for determining parameters, especially channel estimation, in the receiver of a communication system utilising adaptive antenna techniques. The technique uses information transmitted in the antenna signals and in the beam signals to det... | 02/17/2009 |
| 7486747 | Digital timing recovery operable at very low or less than zero dB E/N A receiver (20) for performing timing recovery over at least one complex channel at low or less than zero SNR (signal power to noise power, in dB) has at least one receive element such as an antenna, an analog-to-digital converter 21 (ADC), a fractiona... | 02/03/2009 |
| 7480348 | I/Q demodulation circuit In an I/Q demodulation circuit, an offset amount determined in an offset detection mode is previously stored so that, in a normal reception mode, an offset is corrected for based on the data thus stored. With this configuration, a DC offset and a phase offset can be... | 01/20/2009 |
| 7480349 | Low IF receiver systems and methods Embodiments of a low intermediate frequency system and method are disclosed. In one embodiment, among others, a method for operating a receiver is disclosed that comprises receiving a radio frequency signal, downconverting the radio frequency signal to a downconvert... | 01/20/2009 |
| 7477706 | Switched capacitor network for tuning and downconversion An input signal (IN) is filtered (605) to remove aliases and a switched capacitor network (610) undersamples this signal to provide a downconverted, near-baseband signal. An amplifier (615) adjusts the amplitude of this signal to match a digitiz... | 01/13/2009 |
| 7474713 | System and method for demodulating multiple QAM signals A system and method demodulate N QAM signals (N being a positive integer equal to or greater than 1) substantially simultaneously using, for example, one or two oscillators, regardless of how many QAM signals need to be demodulated. ... | 01/06/2009 |
| 7474712 | Digital undersampling A method and system for processing a signal are disclosed. The method comprises: applying an algorithm to selectively negate a plurality of samples of the signal to provide negated and non-negated samples of the signal, and use the negated and non-negated samples as... | 01/06/2009 |
| 7471745 | Method and apparatus for channel quality metric generation within a packet-based multicarrier modulation communication system A communication system disclosed herein includes a channel quality estimation module that determines the channel quality metric utilizing the preamble portion of the packet only. Data, in such a communication system, is transmitted in the form of a packet over a dat... | 12/30/2008 |
| 7466768 | IQ imbalance compensation The present invention discloses a method and apparatus of IQ imbalance compensation for a receiver. The repetitive attribute of the preamble in a signal received by the receiver is used to estimate the IQ imbalance parameters. The data carried by the preamble repeat... | 12/16/2008 |
