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7268638 |
Apparatus and method for data rate multiplication
The invention is a method for pulse position modulating signals which are synchronized to clocked bit periods using a clock comprising the steps of generating two, three or n signals to mark the...
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7224728 |
Pulse width modulator and pulse width modulation method
A pulse width modulator for producing a PWM signal having reduced nonlinear distortion through interpolation processing with fewer computation steps is provided. The computational processing,...
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7221215 |
Demodulator for demodulating pulse position modulated signal
A PPM signal demodulator for demodulating a PPM signal transmitted in a UWB radio communication system includes a rectifier for rectifying a received PPM signal to obtain an absolute value signal,...
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7221911 |
Multi-band ultra-wide band communication method and system
The present invention provides ultra-wide band communication systems and methods, including multi-band ultra-wide band communication systems and methods. Methods and systems are provided in which...
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7215931 |
Method and apparatus for up-and-down-conversion of radio frequency (RF) signals
This patent describes a method and system which overcomes the LO-leakage problem during modulation and demodulation, common to direct conversion and similar RF transmitters and receivers. This...
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7190722 |
Ultra-wideband pulse modulation system and method
An ultra-wideband pulse modulation system and method is provided. One method of the present invention includes transforming data into a ternary data set with data being represented with states of...
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7183959 |
Method and system for implementing a reduced latency, wideband pulse density modulation digital to analog converter
According to one aspect of the present invention, this invention implements a low latency, wide bandwidth method and system for converting a numeric digital values into a pulse density modulated...
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7184480 |
Digital PWM generator
A digital PWM circuit is provided. One exemplary circuit includes a binary counter, an n-bit DAC and a comparator. The binary counter generates a plurality of binary signals in increasing and/or...
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7170930 |
Receiver
A method of equalizer adaptation involves comparing equalizer output values with a center threshold, and with at least one of a pair of outer thresholds, and adapting the equalizer in order to...
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7164722 |
Radio communications system, transmitter, receiver, radio transmission method, radio reception method and computer program therefor
A radio communications system in which a desired signal can be accurately discriminated from interfering signals, even when signals from a plurality of transmitters are received simultaneously, in...
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7154947 |
Coincidence detection apparatus and method
This invention is to allow accurate high-speed coincidence detection while preventing any increase in circuit scale. To achieve this object, a coincidence detection apparatus includes a detector...
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7145965 |
Digital demodulator for terrestrial receiver
A method and a demodulator for processing a Fast Fourier Transform using data blocks include a Fast Fourier Transform (FFT) coprocessor and a digital signal processor (DSP). The FFT coprocessor...
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7145954 |
Method and apparatus for mapping pulses to a non-fixed layout
A coding method, specifies temporal and/or non-temporal pulse characteristics, where pulse characteristic values are relative to one or more non-fixed reference characteristic values within at...
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7133432 |
Collision mitigation methods used in a communication system
A signal that has been received over a first channel is estimated. A set of channels that the signal will be received over is determined. Based on the estimated signal and the set of channels, the...
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7123843 |
System and method of using variable pulses for symbology
A method and system for storing and transmitting data using variable pulse symbology over a fiber optic or ultra wide band system. Data is stored in memory, accessed and transformed into an...
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7116709 |
Communication method of contactless ID card and integrated circuit used in communication method
The code system is realized by that a plurality of waveforms A and B each having duty ratios of 50% in which only any one of a rising edge and a falling edge is present are combined with each...
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7082153 |
Variable spacing pulse position modulation for ultra-wideband communication links
Methods and systems for generating a variable spacing pulse position modulated (VSPPM) signal for transmission across an ultra-wideband communications channel. The variable pulse position modulated...
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7068715 |
Ultra-wideband communications system and method using a delay hopped, continuous noise transmitted reference
An ultra-wideband (UWB) communications system combines the techniques of a transmitted reference (TR) and a multiple access scheme called delay hopping (DH). Combining these two techniques using...
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7065160 |
Method and apparatus for correcting the phase of a clock in a data receiver
A method for correcting the phase of a clock in a data receiver which receives a data flow representing different signal levels with logical high and low signal values and signal transitions...
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7061993 |
CDMA receiver architecture for lower bypass switch point
A bypass circuit around a filter and RF amplifier of a front end device is activated when a received signal strength (RSS) passes a threshold in which the filter and RF amplifier are not necessary...
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7054361 |
Method and apparatus for enhancing an infrared signal protocol
An apparatus and method for providing control signals, comprising a processor coupled to a memory, for generating a signal sequence. The processor encodes the signal sequence into a plurality of...
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7049995 |
Method and apparatus for remote control transmission
A remote control is operative to transmit a remote control signal composed of a first portion and a second portion. The first and second portions are typically a pulse and a space. The pulse has a...
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7042960 |
Low order spur cancellation mixer topologies
Various mixer topologies, configured to cancel various low order spurs. The mixer topologies each include a pair of mixers and a plurality of couplers. The couplers are configured to cancel...
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7042967 |
Reduced complexity sliding window based equalizer
The present invention has many aspects. One aspect of the invention is to perform equalization using a sliding window approach. A second aspect reuses information derived for each window for use by...
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7027525 |
Digital transmission method for bandwidth and bit rate flexibility
The invention relates to AC coding. The phase angle or the duration of pulses are marked by half-periods or periods and are then provided as stages. The aim of the present invention is to flexibly...
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7003031 |
Pulse width modulating device and exposure device
A PWM signal is made to rise synchronously with a pixel clock by inputting of a pulse to a set terminal (S terminal) of an R-S flip-flop. One of a reference clock, which is generated by a reference...
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6980605 |
MAP decoding with parallelized sliding window processing
A turbo decoder in which a sliding-block MAP decoder pipelines the forward-propagating and backward-propagating computations.
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6975206 |
Method for communication between central terminal and multiple transponders
A method of communicating information from first and second transponders (or multiple transponders) to a central monitoring device, and a communications apparatus, are disclosed. The method...
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6975177 |
Method and system for a generation of a two-level signal
In a modulation system, in order to provide a two-level signal with a desired modulation which is suited to be amplified by a switching mode power amplifier, the modulation system may include a...
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6970496 |
RF modem and communications transceiver utilizing saw device and pulse shaping
A bidirectional direct sequence spread spectrum half-duplex RF modem that can be applied to transmit and receive numerous types of analog and digital pulse modulation. The modem incorporates a SAW...
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6968002 |
Method and apparatus for time aligning data modulators using frequency domain analysis of detected output
Method and apparatus for time aligning first and second signals. The second signal is modulated by the first signal to provide a third signal. Frequency components of the third signal are then...
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6959032 |
Method and apparatus for positioning pulses in time
A coding method specifies pulse positioning over time according to a time layout about a time reference where a pulse can be placed at any location within the time layout. The method generates...
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6954480 |
Method and apparatus for improving received signal quality in an impulse radio system
An impulse radio system includes an impulse transmitter that transmits a pulse train comprising a number of pulses that are positioned in time for conveying an information signal. An impulse...
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6954496 |
Method for transmitting data from an interrogating device to portable objects
A method of information transmission from an interrogator system to portable objects. The information is transmitted through ternary amplitude modulation and positional pulse coding. A frame is...
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6947492 |
Encoding and decoding ultra-wideband information
A system and a method for encoding and decoding ultra-wideband information are provided. An ultra-wideband transmission is encoded by positioning bipolar pulse pairs. The bipolar pulse pairs assist...
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6940892 |
Spread spectrum transmission apparatus, spread spectrum reception apparatus, and spread spectrum communication system
A spread spectrum transmission apparatus includes, a chip clock generation section which outputs a chip clock in one frame formed of M+L−1 chips, a frame clock generation section which outputs a...
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6937639 |
System and method for positioning pulses in time using a code that provides spectral shaping
A system, method and computer program product for positioning pulses, including positioning pulses within a specified time layout according to one or more codes to produce a pulse train having one...
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6911874 |
Ultra-wideband impulse generation and modulation circuit
A modulated ultra wideband pulse generation system is provided. The system comprises a pulse waveform generator circuit operable to generate an on-off pulse waveform, and a modulating circuit...
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6909337 |
Noncoherent pulse position and phase shift keying transmission/reception system and a transmission/reception signal processing method therefor
Disclosed is a noncoherent pulse position and phase shift keying (PPPSK) transmission/reception system and a transmission/reception signal processing method therefor. Transmission system has an...
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6907066 |
Arrangement for reducing transmitted jitter
A pulse transmitter includes a phase correction module configured for detecting a phase error between a transmit clock and a prescribed clock specification at a transmit clock instance. The...
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6895046 |
System and method of providing a spread spectrum pulse width modulator clock
A system and method of creating a pulse train signal of a pulse width modulator whose fundamental frequency is time-varying is disclosed. The electrical system includes a pulse width modulator...
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6888887 |
Frequency-shifted feedback cavity used as a phased array antenna controller and carrier interference multiple access spread-spectrum transmitter
An optical processor for controlling a phased antenna array uses a frequency-shifted feedback cavity (FSFC), which includes a traveling-wave cavity. The FSFC incrementally delays and incrementally...
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6842608 |
Response calibration scheme using frequency-shifted stimulus signals
The response of a receiver is calibrated using frequency-shifted stimulus signals. A source provides a stimulus signal that has a non-zero bandwidth and an adjustable spectral position. A signal...
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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...
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6803816 |
Switching power amplifier
Switching power amplifiers are used for example in audio applications. Using Class D technology is used to obtain efficient performance. To improve the switching power amplifier further it is...
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6788219 |
Structure and method for pulse telemetry
A mud pulse telemetry technique that uses a number of bits per interval based on parameters of the pulse position modulation system in order to reduce data transfer time in a pulse position...
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6784790 |
Synchronization/reference pulse-based powerline pulse position modulated communication system
A transmitting controller is connected to a powerline and on command places a reference signal and a series of signal pulses in the powerline at a series of signal timing positions related to zero...
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6775323 |
Data coding system
A data coding system for coding data represented by a number of symbols is described. The system includes representing each symbol with a unique digital waveform. All the unique digital waveforms...
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6768773 |
Arrangement for determining the phase position of a data signal
In an arrangement for determining the phase position of a data signal in the form of digital sampling values, comprising asynchronous modulated data having a known modulation frequency, a possible...
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6765959 |
Communication method of contactless ID card and integrated circuit used in communication method
The code system is realized by that a plurality of waveforms A and B each having duty ratios of 50% in which only any one of a rising edge and a falling edge is present are combined with each...
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