Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 8189708 | System and method for accurate downlink power control of composite QPSK modulated signals A method for controlling code power levels of individual codes of a composite quadrature phase shift keyed (QPSK) signal. The method may involve obtaining a sample of the composite QPSK signal; separating the individual codes from the composite QPSK signal; analyzin... | 05/29/2012 |
| 8107551 | Systems and methods for signal modulation and demodulation using phase Certain embodiments provide a system for recovering data from at least one signal. The system can include an analog-to-digital converter (ADC) and in-phase/quadrature (IQ) generator component that can sample a signal recovered from a communication medium to generate... | 01/31/2012 |
| 7864878 | Method for receiving an OFDM signal The method is for receiving an OFDM signal according to which, during a frequency translation phase, there is introduced a phase and gain imbalance between the phase and quadrature components thereof, and a frequency offset relative to a main carrier of the OFDM sig... | 01/04/2011 |
| 7813443 | Transmit diversity system and method A transmitter including a plurality of transmitting antennas and a processor operably coupled to the plurality of transmitting antennas. The processor is configured to select a first antenna from the plurality of transmitting antennas for transmission of a frame of ... | 10/12/2010 |
| 7804912 | Method and apparatus for encryption of over-the-air communications in a wireless communication system A communication device converts a bit stream to multiple symbols and provides encryption at a physical layer by shifting a phase of each symbol of the multiple symbols to produce multiple encrypted symbols. Each encrypted symbol of the multiple encrypted symbols is ... | 09/28/2010 |
| 7672392 | Arrangements and methods for a digital communication system Methods, computer-readable medium, a transmitter, a receiver and a transceiver include the transmitter and the receiver in a digital communication system for reducing the transmit power level when there is no user data is to send, i.e., when dummy data is sent inste... | 03/02/2010 |
| 7529312 | Layered modulation for terrestrial ATSC applications Systems and methods are disclosed for applying layered modulation to an 8-VSB signal as used in the Advanced Television Systems Committee (ATSC) digital television signal. A system for transmitting the layered signal includes a first antenna for transmitting an uppe... | 05/05/2009 |
| 7469491 | Transmitter predistortion circuit and method therefor A digital communications transmitter (100) includes a digital linear-and-nonlinear predistortion section (200, 1800, 2800) to compensate for linear and nonlinear distortion introduced by transmitter-analog components (120). A direct-digital-down... | 12/30/2008 |
| 7443920 | Frame-based carrier frequency and phase recovery system and method Header information is used to facilitate coarse frequency and frame recovery. The coarse frequency and frame recovery is thereafter utilized to perform adaptive phase and frequency synchronization on a frame-by-frame basis. A digitized signal representative of a wir... | 10/28/2008 |
| 7433428 | Method of reducing the variance of the signal-to-noise rate estimated for a signal with amplitude differential phase-shift keying modulation This method reduces the variance of the estimation of the signal-to-noise rate in a multiuser digital communications system. These communications require a sending of a phase reference symbol prior to sending a information, where the estimation is made of the signal... | 10/07/2008 |
| 7434136 | Method of and apparatus for reading recording medium, harddisk controller An ECC determining unit determines whether an error detected by using an ECC has been corrected. When the detected error has not been corrected, an equalizer output sequence transfer unit transfers an equalizer output sequence yk stored in an equalizer ou... | 10/07/2008 |
| 7424662 | Method and system for providing low density parity check (LDPC) encoding An approach is provided for a method of encoding structure Low Density Parity Check (LDPC) codes. Memory storing information representing a structured parity check Matrix of Low Density Parity Check (LDPC) codes is accessed during the encoding process. The informati... | 09/09/2008 |
| 7409002 | Signal modulation According to an embodiment of the invention, a method and apparatus for signal modulation are described. According to an embodiment of the invention, a method comprises producing and transferring a modulated signal. The modulation of the signal is over a plurality o... | 08/05/2008 |
| 7382717 | Method for generating better than root raised cosine orthogonal frequency division multiplexing (BTRRC OFDM) An improved multicarrier modulation system and method is introduced which has the advantages of both isotropic orthogonal transfer algorithm orthogonal frequency division multiplexing (IOTA OFDM) and scalable advanced modulation (SAM). The invention reduces adjacent... | 06/03/2008 |
| 7369819 | Digital amplitude modulation transmitter with pulse width modulating RF drive A digital amplitude modulation (AM) transmitter with pulse width modulating RF drive is presented. A plurality of RF amplifiers, each, when turned on, amplifies an applied RF drive signal by the same amount to provide a unit step RF output. An encoder supplies turn-... | 05/06/2008 |
| 7356091 | Apparatus, methods and articles of manufacture for signal propagation using unwrapped phase The invention relates to a system for processing an electromagnetic input signal in which processing circuitry may be used to produce a bounded phase signal, such as by calculating an n-bit 2's compliment number in the range of [−1, 1] from phase sample informatio... | 04/08/2008 |
| 7355963 | Tone allocation in multipoint-to-point communication using orthgonal frequency division multiplexing Systems for tone allocation are provided. In one embodiment, a system comprises: a plurality of remote units and a host including a demodulator. Each remote transmits an upstream OFDM signal using a multiple access scheme to the host using an OFDM waveform. The host... | 04/08/2008 |
| 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 |
| 7349365 | Mobile telephone messaging by baseband envelope modulation A method and system communicates messages using a radio signal. The radio signal is transmitted according to an air interface standard for wireless radio communications. A baseband envelope of the transmitted radio signal is modulated while maintaining compliance wi... | 03/25/2008 |
| 7342976 | Predistortion circuit and method for compensating A/D and other distortion in a digital RF communications transmitter A digital communications transmitter (100) includes a digital linear-and-nonlinear predistortion section (200, 1800) to compensate for linear and nonlinear distortion introduced by transmitter-analog components (120). A direct-digital-downconver... | 03/11/2008 |
| 7321752 | Linear amplification arrangement with non-linear amplifier element for a mobile radio device A system and method to optimize the efficiency of an amplifier device is provided by the including a non-linear amplifier in a mobile radio device. A phase displaced signal in relation to the input signal is respectively produced in the amplifier device with a non-l... | 01/22/2008 |
| 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 |
| 7310398 | Symbol synchronizing device A symbol synchronization device that enables effective symbol synchronization establishment and synchronization holding for an arbitrary spread code sequence. The device includes (i) a primary demodulation section for receiving a spread modulation signal where chips... | 12/18/2007 |
| 7305029 | Multi-pair gigabit ethernet transceiver Various systems and methods providing high speed decoding, enhanced power reduction and clock domain partitioning for a multi-pair gigabit Ethernet transceiver are disclosed. ISI compensation is partitioned into two stages; a first stage compensates ISI components i... | 12/04/2007 |
| 7293698 | Wiegand converter and method of generating a bi-directional data A Wiegand Converter for generating a bi-directional data includes a Terminal Data Separator, a Switch Controller, a Bi-directional Switch to control the Input or Output Wiegand Data send through a Bi-directional Wiegand Data Line. The Received Data sent to Converter... | 11/13/2007 |
| 7295819 | Signal sample acquisition techniques A sample acquisition apparatus for sampling first and second signals within a signal processing arrangement, includes a sampler for capturing sections of the waveforms of both the first and second signals, a switch for alternating correction of the sampler to a poin... | 11/13/2007 |
| 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 |
| 7269233 | Algorithm of bit synchronization for a digital FSK correlation receiver An algorithm for bit synchronization in a frequency shift keying (FSK) receiver. In the algorithm, a training sequence is received from a transmitter. The training sequence has a plurality of bits. A starting point of a next bit received by the FSK receiver after th... | 09/11/2007 |
| 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 |
| 7257148 | Radio transmitting apparatus, radio receiving apparatus, radio transmitting method, and radio receiving method A spread code sequence generator generates a spread code sequence with the frequency of a synthesizer, and then outputs the spread code sequence to a multiplier. The multiplier outputs a spread signal obtained by multiplying a data sequence by the spread code sequen... | 08/14/2007 |
| 7254186 | Electromagnetic wave transmitter, receiver and transceiver systems, methods and articles of manufacture The invention is directed to a system for processing an electromagnetic wave by receiving rectangular coordinate information for the electromagnetic wave; and directly converting the rectangular coordinate information into a magnitude signal, a sin(Φ), and a cos(Φ... | 08/07/2007 |
| 7251462 | Modulation circuit device, modulation method and radio communication device The amplitude modulator comprises: an angle modulator for angle-modulating a phase signal to be inputted; a waveform shaping means in which, (1) when the magnitude of an amplitude signal to be inputted becomes smaller than a first prescribed value, a waveform of the... | 07/31/2007 |
| 7248647 | Radio telecommunications system operative by interactive determination of soft estimates, and a corresponding method A system to communicate digital data symbols with higher than QPSK modulation comprises a transmitter and receiver. The transmitter comprises, a modulator and circuitry to split and encode the data into a first block of more significant bits and a second block of le... | 07/24/2007 |
| 7239668 | Coded digital modulation method for communication system A new class of 16-ary Amplitude and Phase Shift Keying (APSK) coded modulations, called double-ring APSK modulation, based on an amplitude and phase shift keying constellation in which the locations of the digital signals to be encoded are placed on two concentric r... | 07/03/2007 |
| 7231008 | Fast locking clock and data recovery unit A method of synchronizing a transmitter and a receiver, comprising: receiving a transmitted serial data stream. Creating an N-bit data sample from the serial data stream. Decoding the N-bit data sample by a ring decoding technique. The ring decoding technique compri... | 06/12/2007 |
| 7227482 | Complex band-pass filter for use in digital radio receiver and complex band-pass Δ-Σ AD modulator using the same In a first-order complex band-pass filter, multiplexers are alternately switched over between time intervals of phases A and B, where the multiplexers includes two multiplexers provided at input and output stages, and a multiplexer provided in a feedback circuit of ... | 06/05/2007 |
| 7221915 | 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 regulating the modified signal using at least one analog signal ... | 05/22/2007 |
| 7191387 | Method and apparatus for forward error correction A convolutional decoder for a wired or wireless receiver receiving an encoded datastream. The branch and path metric components compute branch and path metrics for the encoded datastream stream. The traceback unit couples to the path metric component to trace in eac... | 03/13/2007 |
| 7183958 | Sub-ranging digital to analog converter for radiofrequency amplification An apparatus and method for amplifying a radiofrequency signal using a main Digital to Analog Converter (RFDAC) and a subordinate Digital to Analog Converter (Sub-DAC). The main RFDAC provides a first portion of a N-bit digital output, which specifies the amplificat... | 02/27/2007 |
