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| Number | Title | Issue Date |
| 7430247 | Carrier frequency detection for N-ary phase modulated signal Carrier frequency detection for an N-ary modulated signal is achieved by digitizing the N-ary modulated signal, frequency shifting the digitized N-ary modulated signal to prevent aliasing, raising the frequency-shifted signal to the Nth power, transformin... | 09/30/2008 |
| 7362827 | System and method for the demodulation of IFF signals A method for the decoding of a signal in an interrogation/response type of communications system, the received signal being formed by a video signal and a signal containing the data, wherein the method comprises at least the following steps: 1) transposing the recei... | 04/22/2008 |
| 7343139 | Device for converting frequencies, method of calibrating said device and system for transmitting/receiving electromagnetic signals comprising such a device The invention relates to a device for converting frequencies comprising a local oscillator of fixed frequency and a first mixer with two inputs and an output, a first input receiving the signal to be converted and a second input receiving the signal arising from the... | 03/11/2008 |
| 7342954 | Adaptive modulation for wireless networks The invention relates to communication between terminals. Where communication is over an ideal channel then a high throughput modulation scheme can be used. Where the terminals suffer interference or noise, transmission can be modified to a more robust modulation sc... | 03/11/2008 |
| 7340011 | Method of frequency multiplication in a radiocommunications apparatus Radiofrequency apparatus and method including at least one transmitter and/or receiver of a useful signal S0, at least one device adapted to the application of a coefficient N to the useful signal S0. The method includes modulating the useful s... | 03/04/2008 |
| 7336732 | Carrier frequency detection for signal acquisition A carrier frequency in a filtered received M-ary phase-shift keyed (MPSK) modulated signal having in-phase and quadrature components is detected by processing the filtered received signal to remove modulation components and thereby generate a test signal at the carr... | 02/26/2008 |
| 7333555 | Device, system and method for wireless combined-signal communication Briefly, some embodiments of the invention may provide devices, systems and methods for wireless combined-signal communication. For example, a method in accordance with an embodiment of the invention may include transmitting a combined signal over a combined channel... | 02/19/2008 |
| 7321735 | Optical down-converter using universal frequency translation technology A method and system for converting an optical signal to electrical information signals, including demodulated baseband information signals and modulated baseband signals at multiple harmonics. In an embodiment, the optical information signal is amplitude modulated w... | 01/22/2008 |
| 7302013 | Multi-mode variable rate digital satellite receiver Digital signal processing for television signals includes digital feedback loops. Analog information signals are oversampled to provide digital signals. The digital signals are introduced to a digital carrier recovery loop and a digital symbol recovery loop. The gai... | 11/27/2007 |
| 7295826 | Integrated frequency translation and selectivity with gain control functionality, and applications thereof Methods and apparatuses for frequency selectivity and frequency translation, and applications for such methods and apparatuses, are described herein. The method includes steps of filtering an input signal, and down-converting the filtered input signal. The filtering... | 11/13/2007 |
| 7292835 | Wireless and wired cable modem applications of universal frequency translation technology Frequency translation and applications of same are described herein, including cable modem applications. Such applications include, but are not limited to, frequency down-conversion, frequency up-conversion, enhanced signal reception, unified down-conversion and fil... | 11/06/2007 |
| 7283011 | Method for performing dual phase pulse modulation A modulation method, referred to as dual phase pulse modulation (DPPM), represents digital data as a series of high and low pulses whose widths represent groups of M data bits, with both the high and low pulses representing successive M-bit groups. Each of the 2 | 10/16/2007 |
| 7254198 | Receiver system having analog pre-filter and digital equalizer A receiver system suitable for a local area network contains an analog pre-filter (207 or 619), an analog-to-digital converter (210), a digital equalizer (212), and a decoder (605). A symbol-information-carrying input analog signal... | 08/07/2007 |
| 7251295 | Apparatus for recovering carrier An apparatus for recovering a carrier is disclosed, for recovering a carrier correctly even though ghost exists in a signal received in a television, which includes a signal converter outputting baseband I, Q signals by multiplying digitized passband I, Q signals by... | 07/31/2007 |
| 7245655 | Dual antenna receiver Structures and techniques for implementing multiple-antenna configurations within a radio frequency receiver are provided. In one aspect, a modularized multi-antenna receiver is provided having multiple independent microelectronic dice mounted on a common module sub... | 07/17/2007 |
| 7242729 | Signal decoding method and apparatus An apparatus and method for use by a receiver in decoding information sent by phase-shift keying over a carrier frequency is disclosed. The method is well suited for use with power line carrier (PLC) applications as it is adapted to appropriately position the sampli... | 07/10/2007 |
| 7242337 | Band-pass Δ-Σ AD modulator for AD-converting high frequency narrow-band signal with higher precision and lower power consumption A continuous-time band-pass ΔΣ AD modulator subtracts an analog signal from a DA converter from an inputted analog signal, outputs an analog signal having a subtraction result to an AD converter via a continuous-time analog band-pass filter, outputs a digital sign... | 07/10/2007 |
| 7218850 | Apparatus and method for monitoring signal-to-noise ratio in optical transmission systems A high-sensitivity signal-to-noise ratio (SNR) determining apparatus measures the in-band SNR of an optical data signal by detecting and demodulating the optical signal and analyzing a narrow bandwidth of the resulting electrical data spectrum at half the data clock... | 05/15/2007 |
| 7194027 | Channel equalizing and carrier recovery system for home phoneline networking alliance receiver and method thereof A channel equalizing and carrier recovery system for home phoneline networking alliance (HomePNA) receiver and method thereof are provided. The channel equalizing system includes a frequency diverse quadrature amplitude modulation (FD-QAM) equalizer and a quadrature... | 03/20/2007 |
| 7184506 | Frequency drift and phase error compensation in a VOFDM receiver Improved frequency drift and phase error compensation in a VOFDM receiver. The invention is operable to compensate for frequency drift and phase error within a window that may include a single frame, a sub-frame, or multiple frames. The compensation is performed aft... | 02/27/2007 |
| 7183863 | Self-initializing frequency detector A phase-locked loop (PLL) locks onto an input signal to provide an output signal that is proportional in frequency to the input signal. The PLL also detects whether an input signal's frequency falls outside a predetermined range and, whenever the input signal's freq... | 02/27/2007 |
| 7180960 | Phase error corrector and method A phase error corrector circuit and method are disclosed. In one embodiment, a phase error corrector circuit delays a PSK modulated signal and multiplies the delayed PSK modulated signal by the PSK modulated signal in order to generate a forward phase correction sig... | 02/20/2007 |
| 7177364 | System, decoder and method for transmitting, receiving and decoding high-speed digital data signals with reduced electromagnetic emissions A digital communications system includes a transmitter and a receiver. The transmitter is capable of quadrature amplitude modulation (QAM) encoding each bit of at least one n-bit digital signal into at least one QAM signal and thereafter transmitting the QAM signals... | 02/13/2007 |
| 7177617 | Method and apparatus for enhancing signal quality within a wireless receiver A method and apparatus for enhancing signal quality within a wireless receiver are disclosed. An image of a desired signal is down-converted to a baseband signal by a digital down converter. The energy of the baseband signal is subsequently determined. If the energy... | 02/13/2007 |
| 7170956 | Frequency agile tuner and variable rate decimator for digital demodulator An apparatus for demodulating a digital input signal having a pre-assigned symbol rate by using a single sample clock signal is disclosed. The pre-assigned symbol rate is selected from the group consisting of a plurality of symbol rates. The apparatus comprises: a C... | 01/30/2007 |
| 7164327 | Compensation of the IQ phase asymmetry in quadrature modulation and demodulation methods A simplified compensation matrix is set up for the compensation of phase errors between the I and the Q component in data transmission systems with quadrature modulation or demodulation. This simplified compensation matrix permits a previously determined phase error... | 01/16/2007 |
| 7145894 | Continuously adjusted-bandwidth discrete-time phase-locked loop A user equipment which receives a CDMA communication signal that is wirelessly transmitted includes a system for correcting phase errors in an information signal which has been transmitted. The correction system comprises circuitry for generating a correction signal... | 12/05/2006 |
| 7142609 | Method and apparatus for detecting and quantifying impairments in QAM signals A method for detecting and quantifying impairments of a received communication signal of a QAM data communication system represented by a plurality of ideal values. The method includes storing a statistically significant number of a plurality of received points of t... | 11/28/2006 |
| 7133469 | Quadrature demodulator In case that a difference between a frequency of an input signal, which has been subjected to a quadrature modulation, and a frequency of an oscillator is large, a center of spectrum of a mixer output signal shifts, and strays from a pass band of a roll-off filter. ... | 11/07/2006 |
| 7130363 | Apparatus for estimating phase information using matched filter in communication system and method thereof An apparatus and method for estimating phase information, including a matched filter that outputs converted synchronization signals, based on received data, and converted information of the received data; a phase estimator, having a plurality of averagers, that outp... | 10/31/2006 |
| 7130605 | Method and device for synchronization and cancellation of a plurality on interfering signals in radio transmission with frequency reuse A method is provided for realizing, in a radio transmission system, a carrier synchronization and for cancelling one or more co-channel interfering signals from a received main signal, in which a synchronous down-conversion of the received main signal and of each of... | 10/31/2006 |
| 7116963 | Simplified high frequency tuner and tuning method A disclosed method tunes a signal from a channelized spectrum having a predetermined channel spacing. A signal of interest having a predetermined maximum bandwidth is mixed with a local oscillator signal, which has a frequency that is an integer multiple of the chan... | 10/03/2006 |
| 7110435 | Spread spectrum applications of universal frequency translation Frequency translation and spread spectrum applications of same are described herein. Such applications include, but are not limited to, unified down-conversion and de-spreading, unified up-conversion and spreading, RAKE receivers utilizing unified down-conversion an... | 09/19/2006 |
| 7110444 | Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments and circuit implementations Frequency translation and applications of the same are described herein, including RF modem and wireless local area network (WLAN) applications. In embodiments, the WLAN invention includes an antenna, an LNA/PA module, a receiver, a transmitter, a control signal gen... | 09/19/2006 |
| 7103121 | Frequency diverse single carrier modulation for robust communication over in-premises wiring The present invention provides a frequency-diverse single-carrier modulation scheme that extends the usable SNR range of severely distorted channels. This scheme is advantageous for applications in which when the SNR is low and the transmitted spectrum contains unus... | 09/05/2006 |
| 7103110 | Dual phase pulse modulation encoder circuit An dual phase pulse modulation (DPPM) encoder circuit converts data into a series of high and low signal pulses, each of whose time durations or pulse widths represents a group of M data bits, with the alternating high and low pulses representing successive groups. ... | 09/05/2006 |
| 7099647 | Single chip direct conversion transceiver for reducing DC offset and method of manufacturing the same A single chip direct conversion transceiver that includes a substrate on which a mixer unit and a local oscillator are provided as a circuit, and a positive hole formed between the mixer unit and the local oscillator and filled with a conductive plug to block signal... | 08/29/2006 |
| 7092687 | Five-port topology for direct down-conversion An apparatus for a direct down-conversion of modulated RF signals, the device including: a first power detector connected between an input port for the modulated RF signal and ground, which outputs a first DC signal, a second power detector connected between an inpu... | 08/15/2006 |
| 7092458 | Carrier recovery circuit and lock detection circuit for mixed PSK signals A BPSK phase detection unit assumes that an input signal is a BPSK modulated signal in detecting a phase error of a recovered carrier and an 8PSK phase detection unit assumes that the input signal is an 8PSK modulated signal in detecting the phase error of the recov... | 08/15/2006 |
| 7085335 | Method and apparatus for reducing DC offsets in a communication system Methods and apparatuses for reducing DC offsets in a communication system are described. In a first aspect, a feedback loop circuit reduces DC offset in a wireless local area network (WLAN) receiver channel. The frequency response of the feedback loop circuit can be... | 08/01/2006 |
