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| Number | Title | Issue Date |
| 8121172 | Chirped surface acoustic wave (SAW) correlator/expander A surface acoustic wave (SAW) expander based transmitter and correlator based receiver comprises SAW devices that perform expander or correlator functions based on the types of signals inputted to the SAW devices. The SAW devices incorporate chirp with adaptive inte... | 02/21/2012 |
| 7924904 | RF band clock spur harmonic canceller A network device for cancelling spurs without affecting an incoming signal. The network device includes an estimator for estimating amplitude and phase of a spur over a predetermined period of time. The network device also includes processing means for freezing furt... | 04/12/2011 |
| 7839914 | Method and apparatus for channel estimation to electro-magnetic wave multi path between sender and receiver by using chirp signal Disclosed is a method and an apparatus for channel estimation regarding electromagnetic wave multi-path characteristics between a sender and a receiver by using a chirp signal. The method includes the steps of (a) multiplying a received composite signal by a narrowb... | 11/23/2010 |
| 7809043 | Method and system for a flexible automatic frequency control (AFC) design supporting transmit diversity Aspects of a method and system for a flexible automatic frequency control (AFC) design supporting transmit diversity are presented. Aspects of the system may include one or more circuits that enable computation of at least one frequency error value based on one or m... | 10/05/2010 |
| 7653118 | Chirped surface acoustic wave (SAW) correlator/expander A surface acoustic wave (SAW) expander based transmitter and correlator based receiver comprises SAW devices that perform expander or correlator functions based on the types of signals inputted to the SAW devices. The SAW devices incorporate chirp with adaptive inte... | 01/26/2010 |
| 7639729 | Channel estimation method and apparatus using fast fourier transforms A low cost method and system for efficiently implementing channel estimation in a wireless communication system using any desired length of a fast Fourier transform (FFT) independent of burst type or signal structure. The hardware complexity required to perform the ... | 12/29/2009 |
| 7616676 | Method and system for performing distance measuring and direction finding using ultrawide bandwidth transmissions An identification tag is provided in which radio frequency (RF) circuitry and ultrawide bandwidth (UWB) circuitry are both provided on the same tag, along with some UWB-RF interface circuitry. The RF circuitry is used to detect when the identification tag must be ac... | 11/10/2009 |
| 7436909 | Method for estimating time of arrival of received signals for ultra wide band impulse radio systems A method estimates a time of arrival of a signal received in a wireless communication system. An energy in a frame of a received signal is measured to determine a block in the frame, the block representing a coarse time of arrival of the received signal. Multiple ti... | 10/14/2008 |
| 7400867 | Radio broadcast receiver A radio broadcast receiver is provided which reduces the degradation in quality of diversity-received signals. When a difference in level between a reception signal of a main antenna and a reception signal of a sub antenna is less than a predetermined threshold valu... | 07/15/2008 |
| 7366243 | Methods and apparatus for transmitting non-contiguous spread spectrum signals for communications and navigation A technique for transmitting a spread spectrum signal using plural non-contiguous frequency bands separated by segments of frequency spectrum excluded from use involves: generating a digital time-domain spread spectrum signal; converting the time-domain signal to a ... | 04/29/2008 |
| 7362790 | Apparatus and method for generating pseudo-replica signals in a CDMA communication system A noise reduction circuit for improving a signal-to-noise ratio of an input signal corresponding to a predetermined sequence of chips, each of the chips having a value corresponding to Logic 0 or Logic 1. The noise reduction circuit comprises a sampling circuit for ... | 04/22/2008 |
| 7362191 | Methods and circuits for frequency modulation that reduce the spectral noise of switching regulators The present invention comprises methods and circuits for spread spectrum frequency modulation that reduce peak spectral noise at the outputs or inputs of switching regulators. More specifically, the present invention modulates the operating frequency of the switchin... | 04/22/2008 |
| 7356094 | Digital broadcast receiving apparatus A digital broadcast receiving apparatus for receiving a broadcast signal generated by combining sub signals modulated using a random sequence generated based on an initial value set in accordance with a frequency of a broadcast channel by a signal transmission contr... | 04/08/2008 |
| 7339977 | Signal strength assisted searcher and acquisition A code division, multiple access (CDMA) receiver includes an RF section for receiving a CDMA signal through a channel; a circuit for determining an instantaneous total received power (Io) of the received CDMA signal; and a searcher that is one of enabled for operati... | 03/04/2008 |
| 7333554 | Communication system with frequency modulation and a single local oscillator A signal processing unit is described relates to a communication system by radio waves with frequency modulation comprising a signal processing unit, a transmission stage for transmitting a transmission signal in response to a modulated control signal and in respons... | 02/19/2008 |
| 7319824 | Optical signal receiver, and method for controlling identification point for binarization processing performed thereby A method for controlling an identification point for binarization processing in an optical signal receiver which can diminish a code error rate by optimally tracking an identification point at all times in accordance with a received signal, thereby maintaining trans... | 01/15/2008 |
| 7315531 | Method and apparatus for transmitting and receiving variable rate data A variable rate transmission system transmits a variable rate data packet including an accompanying rate indication signal indicative of the transmission rate of the variable data packet. The data packet can be spread using a long pseudonoise (PN) code, the mask of ... | 01/01/2008 |
| 7312746 | Method and system for calibration of a radio direction finder A calibration method and a system for providing calibration data for use with a direction finder are provided. The method comprises providing a relative motion of a calibration receiver in a circle manner with respect to calibration transmitter at a predetermined di... | 12/25/2007 |
| 7310303 | Ranging method for mobile communication system based on orthogonal frequency division multiple access scheme Disclosed herein is a ranging method for a mobile communication system based on an OFDMA (Orthogonal Frequency Division Multiple Access) scheme. In the communication system for classifying a ranging procedure between a transmission side and reception sides into an i... | 12/18/2007 |
| 7308043 | Scrambled chirp frequency jitter for feature suppression A method of minimizing detectability of an electronically communicated message is disclosed. A predetermined frequency modulation pattern about a nominal transmission frequency is defined. The predetermined frequency modulation pattern is suitable to vary the nomina... | 12/11/2007 |
| 7301987 | Background processing and searching for a communication channel A method including searching for a communication channel by activating a receiver having a radio frequency (RF) module and a baseband module for storing a portion of received signals within a first time period, de-activating the RF module of the receiver, and backgr... | 11/27/2007 |
| 7295635 | Method of signal processing in the presence of interference The invention relates to methods of processing signals subjected to interference. It consists, when this signal is formed of a first wideband channel and of a second narrowband channel modulating one and the same carrier in which these signals are cut off for the du... | 11/13/2007 |
| 7283479 | Cable TV system or other similar communication system A cable TV system, which is arranged to permit a transmission of signals in the return direction from local networks (10), included in the system, to a head end (11) of the system within a predetermined carrier frequency band, serving for the transmiss... | 10/16/2007 |
| 7263333 | Wireless ultra wideband network having frequency bin transmission level setting and related methods A wireless ultra wideband (UWB) network may include a plurality of UWB wireless devices communicating over a plurality of UWB frequency bins extending over a UWB frequency range. At least one of the UWB wireless devices may be for determining an existing interferenc... | 08/28/2007 |
| 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 |
| 7245930 | Acquisition mechanism for a mobile satellite system A method for enabling synchronization of a communications terminal in a wireless communication system, and a corresponding acquisition system of the communications terminal, wherein the method consists of the steps of: receiving a burst at a receiver of the communic... | 07/17/2007 |
| 7224349 | Electronic apparatus The invention efficiently decreases EMI noise occurring with regard to the entirety of an electronic apparatus with a plurality of clocks as references for the operations. The spread spectrum is applied to the clock used by the largest number of ICs, that is, a disp... | 05/29/2007 |
| 7224716 | Communication methods and apparatus employing spread spectrum techniques and doppler-tolerant polyphase codes A communication apparatus and method that includes generating a series of successive spread-spectrum signals formed through the concatenation of a direct sequence spread spectrum code with a Doppler Tolerant Polyphase Code (DTPC) is herein disclosed. By transmitting... | 05/29/2007 |
| 7206334 | Ultra-wideband high data-rate communication apparatus and associated methods An RF transmitter includes a reference signal generator, a signal generator, and a mixer. The reference signal generator provides a reference signal that has a prescribed or desired frequency. The signal generator provides an operating signal in response to a select... | 04/17/2007 |
| 7200191 | De-modulation of MOK (M-ary orthogonal modulation) A system and method for the iterative detection and demodulation of M-ary orthogonal signals (MOK) and signals modulated using Complementary Code Keying (CCK) is described. An important feature of these methods is the good performance of noncoherent detectors in AWG... | 04/03/2007 |
| 7194019 | Multi-pulse multi-delay (MPMD) multiple access modulation for UWB A new modulation scheme in UWB communications is introduced. This modulation technique utilizes multiple orthogonal transmitted-reference pulses for UWB channelization. The proposed UWB receiver samples the second order statistical function at both zero and non-zero... | 03/20/2007 |
| 7190729 | Ultra-wideband high data-rate communications System and methods for generating ultra-wide band communication signal including: filtering a digital data pulse having a data clocking rate by mixing a filter-function pulse with the digital data pulse; generating a harmonic of a clock oscillator which appears as a... | 03/13/2007 |
| 7177343 | Compound chirp and synchronizer for using same A compound chirp is provided in a received signal to permit a receiver to synchronize to the received signal. The compound chirp has temporally overlapping up frequency and down frequency components. ... | 02/13/2007 |
| 7164918 | Radio communication system A radio communication system has a random access channel for the transmission of data (214) from a secondary station to a primary station. Such a channel is intended for use by secondary stations having data (214) to transmit to a primary station while... | 01/16/2007 |
| 7123578 | Communication system for driving pairs of twisted pair links A communications system includes tow high speed communication links formed by pairs of transformers at either end thereof. A phantom circuit formed by the pairs of transformers is used to distribute power to devices connected to the high speed links. In transmission... | 10/17/2006 |
| 7110432 | Orthogonal chirp modulation in multipath environments Methods and systems for communication systems are disclosed. Chirp signals generated according to a chirp rate and carrier frequency are used for communication. The chirp rate can be determined by solving integrals or by simulation of transmission parameters. A chir... | 09/19/2006 |
| 7095778 | Spread spectrum transmitter and spread spectrum receiver A spread spectrum transmitter provides delays having different magnitudes to spread spectrum (SS) signals for a plurality of channels, and multiplexes the SS signals to generate transmission multiplex SS signal. A spread spectrum receiver calculates a partial correl... | 08/22/2006 |
| 7072421 | IQ modulation systems and methods that use separate phase and amplitude signal paths and perform modulation within a phase locked loop A digital signal processor generates in-phase, quadrature-phase and amplitude signals from a baseband signal. A modulator modulates the in-phase and quadrature-phase signals to produce a modulated signal. A phase locked loop is responsive to the modulated signal. Th... | 07/04/2006 |
| 7072649 | Multiple purpose antenna system A multiple purpose antenna system for installation on a highway truck to receive and transmit signals. The system includes an antenna for communication of electromagnetic frequency signals having multiple band widths, a multiplex unit coupled to the antenna having c... | 07/04/2006 |
| 7068704 | Embedded chirp signal for position determination in cellular communication systems Systems and methods are described here for locating the position of a mobile terminal in a cellular communications system. A base station in the cellular communication system broadcasts a communication signal having embedded therein a navigation signal. The navigati... | 06/27/2006 |
