Quotables
"For a list of all the ways technology has failed to improve the quality of life, please press three."
Alice Kahn
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 |
| 6909757 | METHODS, TRANSMITTERS, AND COMPUTER PROGRAM PRODUCTS FOR TRANSMITTING A SIGNAL BY ADJUSTING A DELAY BETWEEN AN AMPLITUDE COMPONENT OF THE SIGNAL AND A PHASE COMPONENT OF THE SIGNAL BASED ON THE TRANSMISSION POWER Embodiments of methods, transmitters, and computer program products are provided for transmitting a signal by adjusting a delay between an amplitude component of the signal and a phase component of the signal based on the transmission power. Error vector magnitude a... | 06/21/2005 |
| 6909755 | Method and system for increasing data throughput in communications channels on an opportunistic basis A method is presented for increasing data throughput in a communications channel comprising the steps of selecting a first data packet from a queue of data packets to be transmitted over a communications channel, modulating said first data packet using a first modul... | 06/21/2005 |
| 6907084 | Method and apparatus for processing modulation symbols for soft input decoders A method and apparatus for processing modulation symbols for soft input decoders using an efficient method of calculating an accurate log-likelihood ratio without relying on approximations is described. In contrast to other techniques that calculate distance metrics... | 06/14/2005 |
| 6906996 | Multiple modulation wireless transmitter A dual modulation transmitter apparatus (100) includes first (134), second (136), and third (132) signal paths. The first signal path includes a polar modulator (120) coupled to a data input (115). The second signal path inc... | 06/14/2005 |
| 6904538 | System and method for differential data detection The present invention is directed towards a data detector for deriving a data signal from an incoming radio frequency input. The data detector comprises a delay logic which receives an unfiltered signal in quadrature and in-phase components, and applies a delay to e... | 06/07/2005 |
| 6904099 | Digital modulation signal generator With respect to a digital modulation signal outputted from an output terminal, in order to enable desired carrier leak characteristics to be compatible with desired mutual modulation distortion characteristics according to a measurement object, a first level varying... | 06/07/2005 |
| 6903619 | Electromagnetic wave transmitter systems, methods and articles of manufacture A transceiver and transmitter are shown. A baseband processor receives a signal for transmission. It converts the signal into amplitude and phase polar components. Each component is then processed—the phase component through a wideband phase modulator and the ampl... | 06/07/2005 |
| 6898252 | IQ mismatch cancellation A method of assigning values to parameters for IQ mismatch cancellation. The method includes providing values to a processing path of a communication device, passing the provided values through an IQ modulator, at least one non-linear element and an IQ demodulator, ... | 05/24/2005 |
| 6891904 | Modulation signal analysis apparatus An analysis operation section uses a digital signal converted by an A/D converter, and performs frequency analysis for a modulation signal and modulation analysis for the modulation signal selected by a signal selection circuit in order to modulate/analyze a digital... | 05/10/2005 |
| 6879641 | Transmit pre-equalization in a modem environment The signal distortion present in a transmitted signal is measured and used to generate filter coefficients. The coefficients are stored in memory. A modulator generates an intermediate frequency signal. The modulator inputs the signal to a programmable predistortion... | 04/12/2005 |
| 6879640 | Method, apparatus and system for high-speed transmission on fiber optic channel Multi-carrier modulation fiber optic systems constructed using a series of electrical carriers, modulating the data on the electrical carriers and combining the carriers to form a wideband signal. The wideband signal can then be intensity modulated on a laser and co... | 04/12/2005 |
| 6870435 | Electromagnetic wave transmitter, receiver and transceiver systems, methods and articles of manufacture The invention relates to a system for electromagnetic processing of an input wave involving receiving a modified signal derived from two or more signals that represent the input wave when combined; and alternately regulating the modified signal using a digital signa... | 03/22/2005 |
| 6865393 | Method and system for excess resource distribution in a communication system A method and system (102) provide adaptive modulation/coding with distribution of excess resources based on one or more system criteria. The system (102) may be any system with more than one modulation rate or more than one coding rate and may be a wir... | 03/08/2005 |
| 6853690 | Method, system and apparatus for balanced frequency up-conversion of a baseband signal and 4-phase receiver and transceiver embodiments A balanced transmitter up-converts a baseband signal directly from baseband-to-RF. The up-conversion process is sufficiently linear that no IF processing is required, even in communications applications that have stringent requirements on spectral growth. In operati... | 02/08/2005 |
| 6831955 | Noise generator To generate a noise signal corresponding to an “antinoise environmental test” of CDMA, a noise generator 1 has a noise source A 2, an amplifier A 4, and a filter A 6 for generating an I signal for quadrature modulation and a noise sou... | 12/14/2004 |
| 6819910 | Radio employing a self calibrating transmitter with reuse of receiver circuitry A radio includes a self-calibrating transmitter that uses a portion of a receiver section to perform self-calibration. Accordingly, the radio includes a transmitter section, mixer, analog receiver section, calibration switch module, digital receiver section, calibra... | 11/16/2004 |
| 6819721 | Limiting method and limiter apparatus A limiting method is provided which limits signals having two components I channel and Q channel on two orthogonal coordinate axes within a predetermined range on the coordinate plane specified by the two coordinate axes, wherein the predetermined range is defined b... | 11/16/2004 |
| 6798846 | ARQ retransmission with reordering scheme employing multiple redudancy 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 ... | 09/28/2004 |
| 6785528 | Quadrature divider A quadrature divider includes a first analog mixer (20, 30) for receiving a digital input signal at a predetermined frequency at a first input of the mixer and a second analog mixer (24, 32) for receiving the input signal with a 180° phase shift at a ... | 08/31/2004 |
| 6781448 | Method and apparatus for demodulating data An automatic gain control circuit capable of accurately executing control irrespective of the conditions of control is to be provided. This automatic gain control circuit includes a multiplier, low pass filters, a comparator, first and second absolute value circuits... | 08/24/2004 |
| 6771710 | Partial frequency offset digital upconversion The present invention is an apparatus for and a method of upconverting a (complex) phase and possible amplitude modulated baseband signal for radio transmission, also known in the industry as Quadrature Amplitude Modulation (QAM). The two components of the baseband ... | 08/03/2004 |
| 6768390 | System and method for generating balanced modulated signals with arbitrary amplitude and phase control using modulation Modulated differential (balanced) drive signals are created where, at least one of the signals can be controlled in phase relative to the other, and both of which could be controlled in amplitude and both of which have the same modulation envelope. In one embodiment... | 07/27/2004 |
| 6768391 | Class-B biased gilbert cells and quadrature modulators Quadrature modulators include a quadrature splitter and a pair of Gilbert Multiplier Cells coupled to the quadrature splitter, each of which is biased in Class-B. The quiescent current bias in the Gilbert Multiplier Cells may be substantially zero. Each of the Gilbe... | 07/27/2004 |
| 6763072 | Method and apparatus for modulation and demodulation related to orthogonal frequency division multiplexing Data pieces representative of in-phase components and quadrature components of a digital-modulation-resultant signal are assigned to frequencies for inverse fast Fourier transform. The inverse fast Fourier transform is executed at a predetermined sampling frequency ... | 07/13/2004 |
| 6757334 | Bit rate agile third-generation wireless CDMA, GSM, TDMA and OFDM system Systems, apparatus, and methods for new generations of wireless systems, including multiple standard, interoperable Third-Generation (3G) and Second-Generation (2G), Spread Spectrum CDMA, WCDMA, GSM, Enhanced GSM systems and CSMA, TDMA and OFDM. Bit Rate Agile (BRA)... | 06/29/2004 |
| 6751269 | Bit-interleaved coded modulation for CATV upstream channels A bit-interleaved encoder for a CATV upstream channel is provided having a convolutional encoder for receiving data values, a bit-interleaver interconnected with said encoder, and a symbol mapper interconnected with said bit-interleaver. ... | 06/15/2004 |
| 6748023 | Apparatus and method for digital wireless communications In a multivalue modulation type with one pilot symbol inserted for every 3 or more symbols, signal points of each one symbol immediately before and after a pilot symbol are modulated using a modulation type different from that for pilot symbols. In this way, it is p... | 06/08/2004 |
| 6744825 | Method and system for quadrature modulation and digital-to-analog conversion A method and system for quadrature modulation and digital-to-analog conversion of a sampled and digitally represented complex baseband signal which permits the use of simple, power-saving, accurate and effective digital signal processing up to a very high intermedia... | 06/01/2004 |
| 6745015 | Method for automatic carrier suppression tuning of a wireless communication device This invention is a method of carrier suppression tuning of a wireless communication device (100) utilizing a quadrature modulator (104) in a transmission path (102). A power detector (128) and a processor (132) are coupled to the ends of... | 06/01/2004 |
| 6731695 | Systems and methods for implementing receiver transparent Q-mode In a receiver transparent Q-mode, i.e., a Q-mode that is only implemented by a transmitter, the receiver is unaware of the Q-mode state of the transmitter. In this type of Q-mode configuration, the transmitter could enter and exit Q-mode as desired while the receive... | 05/04/2004 |
| 6724829 | Automatic power control in a data transmission system A system for use in transmitting digital data includes a modulation element that receives block of digital data and modulates each block using one of at least two modulation types, such as QPSK and k-QAM, where k is a power of 2. The system also includes an automati... | 04/20/2004 |
| 6721267 | Time and bandwidth scalable slot for mobile data system A scalable slot format defining positions of synchronization symbols, pilot symbols and data symbols for various numbers of sub-channels and various lengths of time in a multi-carrier communication system. An initial pattern (500) and one or more follow-on pa... | 04/13/2004 |
| 6717990 | Communication system and method for multi-rate, channel-optimized trellis-coded quantization A communication system (20) employs fixed rate channel-optimized, trellis-coded quantization (COTCQ) at a plurality of diverse encoding bit rates. COTCQ is performed through a COTCQ encoder (40) and COTCQ decoder (54). The COTCQ encoder and deco... | 04/06/2004 |
| 6700928 | Tetrahedron modem A tetrahedron modem phase modulates input serial binary data and demodulates input waveforms based on a four dimensional vector set. The phase modulation scheme has four possible state vectors (or symbols), that form a tetrahedron in four dimensional spac... | 03/02/2004 |
| 6693970 | QAM modulator Known digital QAM modulators use sine/cosine memories and a plurality of multipliers. This can be avoided by replacing the circuitry which carries out the circular rotation of [I(n), Q(n)]T performed in all the QAM modulators, with a CORDIC algorithm. The... | 02/17/2004 |
| 6690743 | Compensation of delay in linearization loop of power amplifier A method of compensating delay in an linearization loop of a power amplifier and a linearization arrangement of a power amplifier, which arrangement includes an I/Q modulator, one or more power amplifiers to be linearized and generating delay, and a feedb... | 02/10/2004 |
| 6690741 | Ultra wideband data transmission system and method A data-modulated ultra wideband transmitter that modulates the phase, frequency, bandwidth, amplitude and/or attenuation of ultra-wideband (UWB) pulses. The transmitter confines or band-limits UWB signals within spectral limits for use in communication, p... | 02/10/2004 |
| 6687311 | Direct QAM modulator with digital feedback control and complex pre-equalization for phase and amplitude distortion A direct quadrature amplitude modulation (QAM) modulator provides amplitude and phase pre-equalization to reduce complexity and cost. In-phase (I) and quadrature-phase (Q) QAM signal components are provided from an analog modulator. A radio-frequency (RF)... | 02/03/2004 |
| 6683917 | Base band signal processing circuit capable of improving both noise characteristic and distortion characteristic The base band signal processing circuit of the present invention intends to improve both the noise characteristic and the distortion characteristic, and moreover set both the characteristics in a desirable balance. The base band signal processing circuit ... | 01/27/2004 |
| 6678334 | Methods of reducing the complexity of trellis-based scalar-vector quantizers Methods of a reducing the complexity of Trellis-Based Scalar-Vector Quantizer (TB-SVQ) includes the initial step of defining an unbounded set of reproduction symbols in which neighboring symbols are distanced from each other by a predetermined factor. The... | 01/13/2004 |
