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| Number | Title | Issue Date |
| 8179993 | Digital branch calibrator for an RF transmitter The present invention provides a digital (computational) branch calibrator which uses a feedback signal sensed from an RF transmit signal path following the combining stage of LINC circuitry of a transmitter to compensate for gain and phase imbalances occurring betw... | 05/15/2012 |
| 8179994 | Phase error de-glitching circuit and method of operating A system including a phase comparator to compare a first signal and a second signal to generate a phase error signal, and a controller to generate an adjusted phase error signal from the phase error signal in response to an amplitude of at least one of the first sig... | 05/15/2012 |
| 8175189 | Fast generalized decision feedback equalizer precoder implementation for multi-user multiple-input multiple-output wireless transmission systems A technique is used to realize a generalized decision feedback equalizer (GDFE) Precoder for multi-user multiple-input multiple-output (MU-MIMO) systems, which significantly reduces the computational cost while resulting in no capacity loss. The technique is suitabl... | 05/08/2012 |
| 8175188 | Reduced complexity multicarrier precoder A reduced complexity precoder provides an efficient method and structure to precode a vector-signal-point sequence for transmission through a band-limited channel. The precoder enables a block-oriented receiver to recover an underlying data stream in the presence of... | 05/08/2012 |
| 8170141 | Transmitting device, transmitting/receiving device, transmitting method and transmitting/receiving method A transmitting device according to the present invention comprises: a coding unit which encodes a transmission information bit string to a code bit string; a low-order modulating unit which conducts low-order modulation on the code bit string outputted from the enco... | 05/01/2012 |
| 8170140 | Modified active-set approach for Peak-to-Average power ratio reduction via reservation tone An active-set PAR reduction method has low computation cost and delay. Peak canceling, by adding up the original signal and the peak canceling signal, is done only after the final peak canceling signal that can reduce all peaks of the resultant signal below the desi... | 05/01/2012 |
| 8149950 | Method and system for baseband predistortion linearization in multi-channel wideband communication systems An efficient baseband predistortion linearization method for reducing the spectral regrowth and compensating memory effects in wideband communication systems using effective multiplexing modulation technique such as wideband code division multiple access and orthogo... | 04/03/2012 |
| 8144806 | Device, system and method of I/Q mismatch correction Briefly, some embodiments of the invention may provide devices, systems and methods of in-phase and quadrature mismatch analysis and correction. For example, a method in accordance with an embodiment of the invention may include re-encoding an estimated symbol of an... | 03/27/2012 |
| 8144807 | Crosstalk cancellation in digital subscriber line communications A digital subscriber line (DSL) modem that has a canceller digital filter for cancelling crosstalk and RF interference in a received DSL signal is disclosed. The modem includes common-mode sense circuitry and also differential-mode sense circuitry. Samples of the co... | 03/27/2012 |
| 8135090 | Transmission device A transmission device of the present invention comprises: an orthogonal modulator performing orthogonal modulation on a carrier wave using an input signal comprising an in-phase signal component and an orthogonal signal component, and outputs a modulation signal to ... | 03/13/2012 |
| 8130864 | System and method of beamforming with reduced feedback A system and method of beamforming may reduce feedback requirements. In some implementations, a beamforming technique may employ a diagonal matrix as a beamforming matrix along with a stream-to-transmit antenna mapping matrix. In some antenna phase beamforming strat... | 03/06/2012 |
| 8130865 | Digital modulation jitter compensation for polar transmitter In one implementation, a polar transmitter includes a digital signal processing component that processes baseband signals and provides a baseband data signal with amplitude values; and a digital pre-distortion component that receives the baseband data signal with am... | 03/06/2012 |
| 8126081 | Signal modulation apparatus, signal modulation method, and computer program product A signal modulation apparatus, a signal modulation method and a computer program product thereof are provided. The signal modulation apparatus is used in a communication framework consisting of a plurality of communication systems. The communication systems comprise... | 02/28/2012 |
| 8121215 | Broadband self adjusting quadrature signal generator and method thereof Low noise phase quadrature signals are generated after receiving a clock signal and adjusting the clock signal in response to a feedback signal to generate a phase adjusted clock signal. The clock signal and the phase adjusted clock signal are exclusive-ored to gene... | 02/21/2012 |
| 8121216 | Channel estimation device, equalization device, and radio system Provided are a channel estimation device and an equalization device capable of achieving high channel estimation accuracy with less amount of calculation processing. The equalization device includes: a channel estimation section including a ZF calculation/clipping p... | 02/21/2012 |
| 8121217 | Method and apparatus for transmitting data in a time division duplexed (TDD) communication system Techniques to process data for transmission in a time division duplexed (TDD) communication system. In one aspect, the frequency response of a forward link is estimated at a base station based on reverse link transmissions (e.g., pilots) from a terminal. Prior to a ... | 02/21/2012 |
| 8111778 | Method for suppressing peak power of orthogonally multiplex signal, peak power suppressing circuit, and transmitter To suppress the peak of the orthogonal multiplex transmission signal which is small in deterioration of the quality of the reception signal by generating the cancellation waveform in synchronization with the timing of the symbol of the transmission signal. There is ... | 02/07/2012 |
| 8107555 | Pre-emphasis automatic adjusting system, method of adjusting pre-emphasis and pre-emphasis setting signal generating circuit A pre-emphasis automatic adjusting system is provided which is capable of placing the best suitable emphasis against attenuation occurring in a through hole. A step signal is transmitted from a transmitting circuit via a signal transmission path to a receiving circu... | 01/31/2012 |
| 8102940 | Receive frequency band interference protection system using predistortion linearization A receive frequency band interference protection system includes an input terminal for receiving an input signal and a dividing coupler coupled to the input terminal. The dividing coupler is configured to divide the input signal into a first signal and a second sign... | 01/24/2012 |
| 8094748 | Transceiver architecture with combined smart antenna calibration and digital predistortion A method, apparatus, and electronic device for using digital predistortion are disclosed. A first transmitter 212 may send a first signal. A second transmitter 212 may send a second signal. A multipurpose calibration transceiver 902 may execute ... | 01/10/2012 |
| 8094750 | Digital television transmitting system and receiving system and method of processing broadcast data A digital television receiving system includes a first known data detector, a second known data detector, and a selector. The first known data detector detects a location of a first known data sequence in a broadcast signal by calculating a first correlation value b... | 01/10/2012 |
| 8094749 | Signaling format for wireless communications Methods, devices and systems for wireless communication generate signals by determining whether legacy devices are within a proximal region of the wireless communication. When at least one legacy device is within the proximal region, a frame is formatted to include ... | 01/10/2012 |
| 8090048 | Method and system for an alternating channel delta quantizer for MIMO pre-coders with finite rate channel state information feedback Aspects of a method and system for an alternating channel delta quantizer for MIMO pre-coders with finite rate channel state information feedback may include quantizing a change in channel state information in a MIMO pre-coding system onto a codebook using a cost fu... | 01/03/2012 |
| 8090050 | Radio communication system, receiver, receiving method, transmitter, transmitting method, and device for and method of calculating delay times for multi-carrier transmission Multi-carrier transmission is performed without inserting a repetitive signal into guard interval periods. A transmitter provides guard interval periods by using a null signal to save transmission power and prevent the deterioration of the SN ratio. Delayed waves at... | 01/03/2012 |
| 8090049 | Method and system for an alternating delta quantizer for limited feedback MIMO pre-coders Aspects of a method and system for an alternating delta quantizer for limited feedback MIMO pre-coders may comprise quantizing a change in channel state information in a MIMO pre-coding system onto at least a first and a second codebook, each of which comprises one ... | 01/03/2012 |
| 8081711 | Predistortion methods and apparatus for polar modulation transmitters Methods and apparatus for predistorting signals in a polar modulation transmitter. An exemplary method includes predistorting an envelope component signal in an amplitude path of a polar modulation transmitter according to a set of AM/AM predistortion coefficients, ... | 12/20/2011 |
| 8081710 | System and method for corrected modulation with nonlinear power amplification A system and method for modulating and amplifying an input signal are provided in a communication transmitter. The transmitter includes a pre-distortion lookup table containing pre-distortion lookup data. An auto-calibration module is in communication with the pre-d... | 12/20/2011 |
| 8077799 | Apparatus and method to adjust a phase and frequency of a digital signal An apparatus comprising at least two controllers each providing control information for controlling phase or frequency of a digital signal, a combiner for combining control information from the at least two controllers to combined control information and a phase rot... | 12/13/2011 |
| 8073073 | Optimized clipping for peak-to-average power ratio reduction A technique for PAR reduction involves producing an optimized clipping pulse. The optimized clipping pulse may be designed to meet certain requirements, such as a spectral mask target or an EVM target, when applied to a signal. ... | 12/06/2011 |
| 8068557 | IQ-modulator pre-distortion An IQ-modulator pre-distorter includes an iteratively updated digital filter (gQ0, gQ1) for filtering one of the branches of an IQ-signal to compensate for IQ-modulator generated amplitude errors. An iteratively updated digital filter (cQI... | 11/29/2011 |
| 8068558 | Selective peak power reduction The present invention provides a technique for reducing the peak power of a combined signal that has a first signal of a first modulation type and a second signal of a second modulation type. Based on the combined signal, peak reduction distortion is determined. The... | 11/29/2011 |
| 8059748 | Multi-mode and multi-band transmitters for wireless communication Transmitters supporting multiple modulation modes and/or multiple frequency bands are described. A transmitter may perform large signal polar modulation, small signal polar modulation, and/or quadrature modulation, which may support different modulation schemes and ... | 11/15/2011 |
| 8054911 | Method for edge formation of signals and transmitter/receiver component for a bus system A method is provided for edge formation of signals and transmitter/receiver component for a bus system. A transmitter/receiver component for a bus system comprises a driver transistor, which is to be looped between a bus line of the bus system and a reference potent... | 11/08/2011 |
| 8050352 | Methods and apparatus for reducing peak-to-RMS amplitude ratio in communication signals A pulse amplitude modulation (PAM) signal generator that injects a copy of a pulse into the PAM baseband signal prior to frequency upconversion and power amplification. The pulse comprises a function of, or an extra copy of, a pulse in the PAM baseband signal. The p... | 11/01/2011 |
| 8045642 | IQ-modulator pre-distortion An IQ-modulator pre-distorter includes means for pre-distorting each IQ-vector by a 2-dimensional linear transformation that depends on the value of the IQ-vector to be pre-distorted. The transformation is based on polynomials in the I- and Q-components. In a prefer... | 10/25/2011 |
| 8040972 | Wireless communication apparatus and method, and signal attenuation prediction apparatus and method A wireless communication apparatus that transmits a transmission signal and receives a reception signal via a wireless transmission channel, the wireless communication apparatus including circuitry for determining an expected signal attenuation along the wireless tr... | 10/18/2011 |
| 8040973 | Transmitter including pre-distortion The present invention relates to pre-distortion in transmitter circuits and provides a circuit for introducing pre-distortion into the output of a transmitter, wherein said pre-distortion comprises a pre-cursor, a cursor and a post-cursor, the circuit comprising: a ... | 10/18/2011 |
| 8036305 | Precoder design for different channel lengths Apparatus and methods construct parameters for a unit associated with a precoder to a channel. Embodiments include forming a plurality of values for precoder constructions, where the values may be obtained from applying a transmission quality criterion to each preco... | 10/11/2011 |
| 8031803 | Transmitter capable of suppressing peak of transmission signal A transmitter capable of suppressing a peak of a transmission signal includes a frequency domain acquisition unit for obtaining a frequency domain signal from the signal for transmission; and a level control unit for controlling a level of the frequency domain signa... | 10/04/2011 |
| 8027406 | Transmitter A transmitter processes signals to be transmitted. The transmitter reduces the peak power generated in a transmission signal, even when many peaks exist. In the transmitter, the peaks of the transmission target signals are detected, and a peak suppression coefficien... | 09/27/2011 |
