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| Number | Title | Issue Date |
| 7778344 | System and method for combining a plurality of signals of various phases having a wide frequency range A system for combining a plurality of signals of various phases having a wide frequency range includes a signal transmuter configured to receive a plurality of input signals of different phases. The signal transmuter is also configured to generate at least one outpu... | 08/17/2010 |
| 7649957 | Non-overlapping multi-stage clock generator system A multi-stage non-overlapping clock signal generator as described herein is suitable for use with a pipelined analog-to-digital converter architecture. The clock signal generator generally includes a back end clock generator, a second stage clock generator, and a fi... | 01/19/2010 |
| 7443921 | Mobile body communication apparatus When communications of the same data are performed using a multi-carrier modulation method between a plurality of base stations and a mobile station at the same time and with the same frequency, a standing wave interference is generated to lower the carrier electric... | 10/28/2008 |
| 7436902 | Multi-dimensional space Gray code maps for multi-dimensional phase modulation as applied to LDPC (Low Density Parity Check) coded modulation Multi-dimensional space Gray code maps for multi-dimensional phase modulation as applied to LDPC (Low Density Parity Check) coded modulation. A novel approach is provided within LDPC coded modulation communication systems that employ multi-dimensional phase modulati... | 10/14/2008 |
| 7409012 | Modulator and signaling method Phase shift key modulators (100, 500, 1000, 1400, 1700) are provided in which a multiphase signal source (108, 1402, 1406-1412,1702) is used to generate a plurality of phases of a carrier signal. A selector (110) is used to select one pha... | 08/05/2008 |
| 7398075 | Radio wave reception device and radio wave clock In a radio wave reception device and a radio wave clock capable of receiving multiple frequencies, an intermediate frequency signal whose frequency is fixed can be output while a signal output from a local oscillation circuit (5) is fixed. ... | 07/08/2008 |
| 7369598 | Ultra-wideband receiver and transmitter A waveform-adaptive ultra-wideband (UWB) transmitter and noise-tracking UWB receiver for use in communications, object detection and radar applications. In one embodiment, the output of an oscillator is gated by a low-level impulse generator either directly or throu... | 05/06/2008 |
| 7369622 | Diversity circuit demodulating OFDM-method signals and diversity receiving apparatus having said diversity circuit therein In a receiving apparatus, two respective reference-point computing units in respective diversity branches calculate reference points on a constellation, and two respective reference-point specifying units in the two diversity branches select respectively the referen... | 05/06/2008 |
| 7362813 | Communication system At the transmitter side, carrier waves are modulated according to an input signal for producing relevant signal points in a signal space diagram. The input signal is divided into, two, first and second, data streams. The signal points are divided into signal point g... | 04/22/2008 |
| 7352822 | Telephone for transmitting an uplink signal to a base station and for receiving first and second downlink signals from the base station, and a base station for receiving an uplink signal from a telephone and transmitting first and second downlink signals to the telephone At the transmitter side, carrier waves are modulated according to an input signal for producing relevant signal points in a signal space diagram. The input signal is divided into, two, first and second, data streams. The signal points are divided into signal point g... | 04/01/2008 |
| 7349488 | Frequency shift keying signaling for integrated circuits The present invention relates to a system for communicating between two integrated circuits (ICs) or within an IC. The ICs are either on the same circuit boards or on different circuit boards with a common backplane. A first integrated circuit has transmitter circui... | 03/25/2008 |
| 7342875 | Space-time coded OFDM system for MMDS applications A communications system includes a base station that is configured to transmit a signal that is modulated according to a predetermined modulation scheme and an orthogonal frequency division multiplexing scheme, wherein the signal is encoded using space-frequency cod... | 03/11/2008 |
| 7336127 | Doherty amplifier configuration for a collector controlled power amplifier An efficient power amplifier circuitry for a mobile terminal or similar wireless communication device is provided. The power amplifier circuitry includes an output stage configured as a collector controlled Doherty amplifier, wherein the collector controlled Doherty... | 02/26/2008 |
| 7330071 | High efficiency radio frequency power amplifier having an extended dynamic range A system and method are provided for efficiently amplifying a radio frequency signal. In general, the system includes power amplifier circuitry that efficiently amplifies an input signal under power back-off conditions. In one embodiment, the power amplifier circuit... | 02/12/2008 |
| 7315574 | System and method for generating a jittered test signal A multi-speed jittered signal generator (216, 400) that generates a full-speed jittered signal (404) by scaling a low-speed jittered signal (420) using a frequency scaler (428). The low-speed jittered signal is created by injecting a modu... | 01/01/2008 |
| 7302014 | Timing recovery in a transmission system A device that receives data transmitted over a network medium includes a memory that stores phase information associated with a pilot tone. The device also includes logic that identifies a second pilot tone received with a number of tones and determines the phase of... | 11/27/2007 |
| 7292650 | OFDM receiver and metric generator thereof A metric generation scheme for use in OFDM receivers. In a preferred embodiment, an OFDM receiver of the invention includes a dynamic quantizer to compress a series of channel-state information values. Also, a bit de-interleaver is provided to de-interleave a series... | 11/06/2007 |
| 7274653 | Hierarchical QAM transmission system with varying grouping factor A hierarchical QAM system allows the transmission of different sources by embedding the relative constellation points. A QAM transmitting system, includes a source of a level 1 and a level 2 data stream, each data stream carrying successive symbols. A hierarchical Q... | 09/25/2007 |
| 7260159 | Method and apparatus for providing higher order modulation that is backwards compatible with quaternary phase shift keying (QPSK) or offset quaternary phase shift keying (OQPSK) A method and apparatus for providing an asymmetrical backwards compatible communications signal that is capable of being decoded by QPSK and OQPSK receivers as well as PSK and QAM receivers is provided. The invention comprises a timing error accumulator coupled to a... | 08/21/2007 |
| 7233264 | Information additive code generator and decoder for communication systems An encoder uses an input file of data and a key to produce an output symbol. An output symbol with key I is generated by determining a weight, W(I), for the output symbol to be generated, selecting W(I) of the input symbols associated with the output symbol accordin... | 06/19/2007 |
| 7227386 | Phase locked loop lock-detection circuit An improved clock lock detection circuit is disclosed. The circuit has a first input indicating an edge of a first clock and a second input indicating a corresponding edge of a second clock wherein the second clock is expected to be synchronized with the first clock... | 06/05/2007 |
| 7221908 | Radio communication apparatus A communication apparatus operating under a back scattering system involving processes of QPSK modulation is provided. The apparatus includes: a first signal channel for acquiring a first reflected wave by getting an incoming radio wave directly reflected without wa... | 05/22/2007 |
| 7210057 | Low-speed DLL employing a digital phase interpolator based upon a high-speed clock A low-speed DLL facilitates a deskewed interface between a high-speed RX data demultiplexer circuit directly to an Application Specific Integrated Circuit (ASIC) with which it is integrated by locking a 156 MHz ASIC clock to a 156 MHz reference derived from a high s... | 04/24/2007 |
| 7176727 | Synthesizer A synthesizer that has a phase detector 8 and a charge pump circuit 9 for injecting an electric charge, or pulling it out that corresponded to a frequency difference of an input, a low-pass filter 11 for converting this electric charge into a vo... | 02/13/2007 |
| 7173974 | Method and apparatus for computing soft decision input metrics to a turbo decoder A method and apparatus for computing soft decision input metrics to a turbo decoder includes circuits associated with eight-ary phase shift keyed (8PSK) modulation and sixteen-ary quadrature amplitude modulation (16QAM). In both implementations log-likelihood ratio ... | 02/06/2007 |
| 7158577 | Communication system At the transmitter side, carrier waves are modulated according to an input signal for producing relevant signal points in a signal space diagram. The input signal is divided into, two, first and second, data streams. The signal points are divided into signal point g... | 01/02/2007 |
| 7149253 | Wireless communication A frequency division multiplexing wireless transmission on two or more antennas with the set of symbols on subcarriers of a burst transmitted by one antenna transformed into another set of symbols on the subcarriers for the corresponding burst transmitted by another... | 12/12/2006 |
| 7149246 | Method and apparatus for reducing oscillator pull in a CMOS wireless transceiver integrated circuit A monolithic transceiver integrated circuit that includes a substrate, a transmitter subsystem of one or more subcircuits on the substrate, and a receiver subsystem of one or more subcircuits on the substrate. Also included is a bias current supply coupled to the re... | 12/12/2006 |
| 7120210 | Method and system for processing a signal A clipped metric function is utilized to mitigate the adverse effects of impulsive noise (e.g., lightening, motor vehicle ignition noise) on communications signals. The clipped metric function may be used alone or in conjunction with conventional signal clipping. In... | 10/10/2006 |
| 7110473 | Mode controller for signal acquisition and tracking in an ultra wideband communication system A system and method is provided for controlling the mode of operation in a UWB receiver. In one variation, the system and method determines the mode of operation by reading a set number of samples of the signal, estimating mode parameters, calculating a mode probabi... | 09/19/2006 |
| 7109791 | Tailored collector voltage to minimize variation in AM to PM distortion in a power amplifier A system is provided for substantially reducing variation in AM to PM distortion of a power amplifier caused by variations in RF drive power and temperature. The system includes power control circuitry and power amplifier circuitry. The power amplifier circuitry inc... | 09/19/2006 |
| 7095797 | Method of modulating a data signal with modulation switching between direct and differential modulation and apparatus for modulation A method and apparatus for modulating a data signal for transmission over a channel of a communication system, wherein a direct modulation scheme is applied to a data signal over a given first signal interval. Subsequently, a control measure is determined for switch... | 08/22/2006 |
| 7092461 | Polyphase receivers A polyphase receiver comprises an RF front end (10 to 28) for receiving a wanted data signal modulated on a carrier signal and for producing quadrature related low IF signals, an image rejection filter formed by a polyphase filter (30) for filte... | 08/15/2006 |
| 7082565 | Method for matching the bit rate in a communication device, and a corresponding communication device In order to match the bit rate in a communication device, the bits of a bit stream are punctured or repeated, in which case for each bit an updated error value is calculated on the basis of a previously determined error value and an update parameter and a judgment i... | 07/25/2006 |
| 7072416 | Transmitting/receiving device and transmitting/receiving method In a modulation method such as 8PSK or a 16PSK in which a sender device expresses a symbol by using three or more bits, important information is arranged at least at only one of the first and second bits, a receiver device extracts the important information from at ... | 07/04/2006 |
| 7035315 | Doppler corrected communications receiver and method of removing doppler frequency shift A method and communications receiver is disclosed that removes Doppler frequency shift in a spread spectrum communications signal. A pilot channel rake section has I and Q Doppler estimation channels for estimating the Doppler change in frequency based on a common p... | 04/25/2006 |
| 7020070 | Selectively controlled modulation distortion of an IQ-baseband signal The frequency bandwidth of a signal is reduced, while retaining the desired signal information, by selectively introducing a controlled distortion to an IQ baseband signal. Selective generation of either a non-distorted complex-valued baseband signal or a distorted ... | 03/28/2006 |
| 7016424 | Method and circuit layout for the transmission of messages by means of approximating hermitian functions A method and circuit arrangement for transmission of messages in which a number of L components (m0, . . . , mL-1) are coded by means of orthogonal functions to a signal (s(t)), and in which approximations of hermitic functions are used as orth... | 03/21/2006 |
| 6985538 | Digital radio communication system and method QPSK modulated quadrature baseband signal generating section 301 generates a QPSK modulated quadrature baseband signal. 8PSK modulated quadrature baseband signal generating section 302 generates an 8PSK modulated quadrature baseband signal. Based on th... | 01/10/2006 |
| 6968494 | Method and apparatus for adaptively coding a data signal A method and apparatus for transmitting an input data signal over an information channel. The input data signal comprises a sequence of data blocks. A puncture coded signal is generated for each data block in the sequence of data blocks. The total number of bits in ... | 11/22/2005 |
