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| Number | Title | Issue Date |
| 8116401 | Method and system for digital spur cancellation A method and system for digital spur cancellation may include removing a spur in a left channel minus right channel (L−R) baseband signal generated from a FM signal. The L−R baseband signal may be generated by demodulating a sub-carrier, for example, by using CO... | 02/14/2012 |
| 7940853 | Method and device for calculating zero-croccing reference sequences for signal detection of angle-modulated signals based on zero crossings of the received signal A method for calculating zero-crossing reference sequences ({ti}) for the data detection of a sequence of zero crossings ({{circumflex over (t)}i}) of a received signal is disclosed. The data detection is determined in a receiver, wherein the r... | 05/10/2011 |
| 7835460 | Apparatus and methods for reducing channel estimation noise in a wireless transceiver Apparatus and methods for use in a wireless communication system are disclosed for reducing channel estimation noise in a device such as a wireless transceiver. A disclosed apparatus includes a processor that determines a channel activity portion and a noise portion... | 11/16/2010 |
| 7492831 | Method for generating multiplier coefficients for a mixer A mixer for mixing a digital input signal with a sampled sinusoidal signal, comprising a calculating circuit for calculating multipliers (MC) of a multiplier group (MG) which exhibits a number of dividing circuits for dividing the digital input signal applied to an ... | 02/17/2009 |
| 7369780 | Remodulating channel selectors for WDM optical communication systems The present invention provides a remodulating channel selector for a wavelength division multiplexed optical communication system. The remodulating selector receives a WDM input signal, selects a particular optical channel from the WDM signal and places the informat... | 05/06/2008 |
| 7349489 | Pulse shaping filter with minimal intersymbol interference An improved shaping filter (R) is provided in a radio frequency communication system. The filter response of the shaping filter (R) is generated by constraining the filter coefficients in their adaptation at the optimal sampling point and not constraining them at th... | 03/25/2008 |
| 7342973 | Method and apparatus for adapting multi-band ultra-wideband signaling to interference sources A method and apparatus for operation in a multi-frequency band system in the presence of an interference, the method comprising the steps of: receiving signaling in a plurality of wideband frequency sub-bands, each wideband frequency sub-band having a different cent... | 03/11/2008 |
| 7330518 | Distortion compensation circuit, and a transmission apparatus including the same Predistortion effective for a power amplifier with the memory effect is provided. An A/D converter digitizes a signal voltage value after quadrature modulation, and the result is supplied to a subtractor. A lookup table outputs voltage value data in accordance with ... | 02/12/2008 |
| 7305046 | I/Q modulator with carrier predistortion An I/Q modulator used for processing an I/Q signal to obtain a predistorted output signal. The I/Q signal has an I component and a Q component, and comprises a predistorter for predistorting, with a predistortion signal, a carrier signal, which comprises a first sub... | 12/04/2007 |
| 7289773 | Digital transmitter system employing self-generating predistortion parameter lists and adaptive controller A method and apparatus for digital predistortion of power amplifiers are disclosed. Successful digital predistortion parameter settings are correlated with the operating conditions that affect the distortion of an amplifier. These operating conditions may include in... | 10/30/2007 |
| 7283594 | Impedance modulation signaling Signalling between transmitting means and receiving means wherein signals from the transmitting means are subjected by the receiving means to deliberate reflections and resulting signals are transmitted back as meaningful at the transmitting means, different deliber... | 10/16/2007 |
| 7283498 | Method and apparatus for allocating a pilot carrier adaptively in an orthogonal frequency division multiple access system A method and apparatus for allocating pilot carriers adaptively in an OFDMA communication system are disclosed. To improve phase error estimation performance and optimize the number of pilot carriers allocated to each sub-channel, an OFDMA transmitter changes the nu... | 10/16/2007 |
| 7277494 | Method of differential-phase/absolute-amplitude QAM A method of quadrature amplitude modulation involving encoding phase differentially and amplitude absolutely, allowing for a high data rate and spectral efficiency in data transmission and other communication applications, and allowing for amplitude scaling to facil... | 10/02/2007 |
| 7263144 | Method and system for digital equalization of non-linear distortion A method is provided for equalization of nonlinear distortion in a distorted signal comprising the steps of: digitizing the distorted signal and passing the digitized distorted signal through an inverse non-linear transfer function to equalize the nonlinear distorti... | 08/28/2007 |
| 7251271 | Digital filter design Method and apparatus for designing digital filters are provided. One method includes the steps of determining a real-valued discrete-frequency representation of a desired digital filter and transforming this discrete-frequency representation into a corresponding dis... | 07/31/2007 |
| 7248639 | Method for reducing the out-of-band emission in AM transmitters for digital transmission A method for reducing out-of-band emission in an AM transmitter for digital transmission includes generating, from a digital modulation signal, an amplitude signal and a phase-modulated radio frequency signal configured to control the AM transmitter. A digital modul... | 07/24/2007 |
| 7242725 | Adaptive broadband post-distortion receiver for digital radio communication system An adaptive broadband post-distortion receiver for wireless digital communications improves performance of a wireless digital communications system. The improved performance of the system includes improved linear AM-AM and AM-PM responses approaching saturation. Ind... | 07/10/2007 |
| 7173979 | Method and device for transmitting information symbols using a plurality of carriers and method and device for receiving information symbols The invention relates to a method and a device for transmitting information symbols using a plurality of carriers, wherein a first transmission symbol is produced (52, 54) on the basis of an information symbol. A second transmission symbol is also produced ( | 02/06/2007 |
| 7164728 | Method and device for forming transport frames from coded-signal frames and device for extracting coded signal frames Transport frames to be transmitted on a communication channel are formed from coded-signal frames. Each coded-signal frame comprises one or more sets of bits to be protected against transmission errors. A respective error detection code is calculated for a subset of... | 01/16/2007 |
| 7158582 | Digital I/Q modulator having a predistortion An I/Q modulator processes a time-discrete I/Q signal comprising an I component and a Q component. The I/Q signal is based on a sampling frequency which is equal to four times a carrier frequency of a carrier signal onto which the I/Q signal is modulated. A predisto... | 01/02/2007 |
| 7131038 | Performance evaluation of multicarrier channels A method and apparatus determines an uncoded bit error rate pb based on a target symbol error rate εs. The uncoded bit error rate pb is determined based on a weighted series expansion of the target symbol error rate εs, ... | 10/31/2006 |
| 7120192 | Spectrum spread communication synchronization establishing apparatus using frequency offset and receiver with the same A synchronization establishing apparatus in a spectrum spread communication system, includes a search section that calculates correlation values from a received spectrum spread signal, and calculates power values and power addition values of the power values. Also, ... | 10/10/2006 |
| 7110470 | ARQ retransmission with reordering scheme employing multiple redundancy versions and receiver/transmitter therefor An ARQ retransmission method in a communication system, wherein data packets comprising modulation symbols are retransmitted based on an automatic repeat request and subsequently combined with previously received data packets, the symbols of said data packets being ... | 09/19/2006 |
| 7106815 | Ingress noise reduction in a digital receiver The invention provides a device (D2) for reducing ingress noise in a digital signal, comprising a noise predictor (20) for predicting an amount of ingress noise in the digital signal (sn) based on past samples of the ingress noise, and a sub... | 09/12/2006 |
| 7072420 | Communications systems The invention relates to a method of adjusting a radio frequency signal produced by radio frequency circuitry in response to receipt of phase and amplitude control signals from digital baseband circuitry which operates to convert digital data signals into such phase... | 07/04/2006 |
| 7068982 | Determination of transmitter distortion The present invention provides a method for determining nonlinear distortion of a transmitter. A test symbol sequence is transmitted from the transmitter under test as an analog output signal. The analog output signal is sampled to produce a first sequence which rep... | 06/27/2006 |
| 7065039 | Fiber optic control network and related method A control network comprises multiple master nodes and multiple slave nodes, connected together in a loop configuration by at least one fiber optic cable. The master nodes share concurrent control over the network nodes by time multiplexing or other techniques. The c... | 06/20/2006 |
| 7065151 | Channel optimization system A channel optimization system for use with a communications channel and method of separating and encoding signals associated with the communications channel. In one embodiment, the channel optimization system includes an assorter that receives first and second signa... | 06/20/2006 |
| 7046738 | 8-PSK transmit filtering using reduced look up tables A method for generating a premodulation-filtered modulation waveform having a real part and an imaginary part for transmitting octal symbols uses a reduced lookup table. Successive octal symbols, each comprising three information bits, are input to a logic unit. The... | 05/16/2006 |
| 7046622 | Multi-tier, hierarchical fiber optic control network A control network comprises multiple master nodes and multiple slave nodes, connected together in a loop configuration by at least one fiber optic cable. The master nodes share concurrent control over the network nodes by time multiplexing or other techniques. The c... | 05/16/2006 |
| 7046621 | Redundant multi-fiber optical ring network A control network comprises multiple master nodes and multiple slave nodes, connected together in a loop configuration by at least one fiber optic cable. The master nodes share concurrent control over the network nodes by time multiplexing or other techniques. The c... | 05/16/2006 |
| 7016431 | Transmitter for transmitting signals over radio channels and method for transmitting signals over radio channels A transmitter for sending signals over wireless channels and a method of sending signals over wireless channels are described. The transmitter and the method are used to determine a transfer characteristic of an amplifier (8) in the transmitter. Test signals ... | 03/21/2006 |
| 6965560 | Multi-tier, hierarchical fiber optic control network A control network comprises multiple master nodes and multiple slave nodes, connected together in a loop configuration by at least one fiber optic cable. The master nodes share concurrent control over the network nodes by time multiplexing or other techniques. The c... | 11/15/2005 |
| 6961306 | Fiber optic control network and related method A control network comprises multiple master nodes and multiple slave nodes, connected together in a loop configuration by at least one fiber optic cable. The master nodes share concurrent control over the network nodes by time multiplexing or other techniques. The c... | 11/01/2005 |
| 6952562 | Method for filtering a mobile radiotelephone signal and corresponding mobile radiotelephone receiver The received mobile radiotelephone signal is analyzed in a mobile radiotelephone receiver (8) for the presence of adjacent channel interference and is only filtered if adjacent channel interference is determined, in order to suppress the same. The selectively... | 10/04/2005 |
| 6922554 | Method for implementing a transceiver and a transceiver The invention relates to a method for implementing a transceiver, in which method radio-frequency signals are transmitted and received with a transceiver for communicating information. A radio-frequency signal received at a receiving stage is subjected to at least a... | 07/26/2005 |
| 6917389 | Linearization compensation system of digital TV relay apparatus and method thereof A linear compensation system of a digital TV relay or other apparatus preferably includes a transmitting unit configured to modulate a data to an intermediate frequency (IF) signal, up convert the IF signal to an RF signal, and amplify the RF signal to a predetermin... | 07/12/2005 |
| 6904479 | Method for transmitting data over a data bus with minimized digital inter-symbol interference A method for transmitting data over a data bus with minimized digital control and data inter-symbol interference. The voltage level on the data bus is not permitted to reach the quiescent negated voltage level set by the bus terminator voltage. Additional time is pr... | 06/07/2005 |
| 6836226 | Ultra-wideband pulse modulation system and method An ultra-wideband pulse modulation apparatus, system and method is provided. The pulse modulation method increases the available bandwidth in an ultra-wideband, or impulse radio communications system. One embodiment of the present invention comprises a pulsed modula... | 12/28/2004 |
| 6834109 | Method and apparatus for mitigation of disturbers in communication systems The present invention includes a method and system for compensating for cross-talk interference in communication systems. The method includes estimation of the interfering signals. Further, the method includes performing a compensation operation on at least one inte... | 12/21/2004 |
