Class 375/153 - Having SAW or charge-transfer device

Subclass of Class 375 - Pulse or digital communications
Definition: Subject matter in which the receiver is implemented using
No. of patents: 31
Last issue date: 09/09/2008

Number	Title	Issue Date
7424047	Receiver based method for de-spreading of spread spectrum signal A spread spectrum receiver whose de-spreading process based on transformed spreading codes is provided. Instead of de-spreading with original spreading codes, this approach de-spreads received signal with the spreading codes transformed from the original codes in or...	09/09/2008
7388899	Spreading code structure for ultra wide band communications The ultra wide band communication system of the present invention includes a transmitter (station) and a receiver (station). The transmitter and the receiver employ spreading code comprised of code groups, which respectively comprise varied, auto-correlated codes. C...	06/17/2008
7386035	Method of compensating for energy loss and eliminating inter-symbol interference and inter-chip interference and rake receiver for WLAN adopting the same Provided is a method of compensating for energy loss and eliminating inter-symbol interference (ISI) and inter-chip interference (ISI) in wireless signals, and a rake receiver for wireless LANs adopting the same. The rake receiver compensates for energy loss of a CC...	06/10/2008
7366227	Chip-to-symbol receiver despreader architectures and methods for despreading spread spectrum signals In a spread spectrum system, methods and despreader architectures for despreading the received spreaded codes with the use of a single correlator and a single correlation code is provided. Before despreading the incoming received spreaded codes, a single correlation...	04/29/2008
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
7292822	Wireless communication system using surface acoustic wave (SAW) second harmonic techniques An IDT produces a SAW when excited by a single electrical pulse and can be fabricated to embody a code, which code provides for a passive autocorrelation of a SAW input to the IDT and thereby lends itself to further application as a signal generator in a communicati...	11/06/2007
7274729	Spread spectrum communication device and communication system A structure of a spectrum spreading communication device which solves the problem with the conventional spectrum spreading communication using Barker codes, etc., and limits the rise of the side-lobe of a correctional signal independently of the order of information...	09/25/2007
7158763	Multi-IDT SAW hybrid communication system A SAW communication device has a main IDT mounted on an SAW substrate to receive an RF signal received by an antenna and convert the RF signal to an acoustic wave which travels along the SAW substrate in opposite directions from the main IDT. At least two secondary ...	01/02/2007
7090724	Langasite single crystal ingot, substrate for piezoelectric device and method for manufacture thereof, and surface acoustic wave device The contents by weight ratio of lanthanum oxide, gallium oxide, and silicon oxide, which are components, in the longitudinal cross-section and transverse cross-section of the straight part, excluding the shoulder part, of a Langasite single crystal ingot grown by pu...	08/15/2006
7031377	Receiver and low power digital filter therefor A digital filter or a receiver including a digital filter having at least two multiple stage shift registers. A plurality of multipliers corresponding in number to the number of stages in the at least two multiple stage shift registers receive as a first input an ou...	04/18/2006
6983011	Filter circuit In a filter circuit of the present invention, a partial quantization value is computed by a quantization circuit according to a spread code and others in a unit at an arbitrary stage, where an integrating value is increased. The partial quantization value is success...	01/03/2006
6825794	Wireless communication system using surface acoustic wave (SAW) second harmonic techniques SAW devices such as interdigital transducers (IDTs) have been widely used in RADAR applications and as filters. An IDT produces a SAW when excited by a single electrical pulse and can be fabricated to embody a code, which code provides for a passive autocorrelation ...	11/30/2004
6801569	Digital matched filter bank for othogonal signal set A spread-spectrum communication system utilizes spreading code sequences, which can be expressed as a matrix. The matrix of code sequences has or can be transformed to have a certain orthogonal relationship. In accord with the invention, a matched filter bank in a s...	10/05/2004
6724804	Frequency converter and radio communications system employing the same In a frequency converter, a phase-locked loop generates a local-oscillation signal having a low frequency, of a plurality of local-oscillation signals having different frequencies, based on an intermediate frequency beacon signal that results from mixing a predeterm...	04/20/2004
6717983	Ultrasonic coding modem for digital network communication An ultrasonic coding modem for digital network communication comprises a transmitting device having a first piezoelectric substrate, and a receiving device having a second piezoelectric substrate. If a message digital-signal is applied to the transmitting device, a ...	04/06/2004
6625205	Matched filter circuit A matched filter having a set of registers to successively store a digital voltage. The matched filter includes a cumulative shift register, a number of exclusive-or circuits, and an analog adder. The cumulative shift register has a number of stages in wh...	09/23/2003
6473454	Rake combiner apparatus using charge transfer element A RAKE combiner apparatus uses a charge transfer element, which can permit a high-precision RAKE receiver to be constructed by a simple circuit structure, has lower consumption power, can allow the finger number to be arbitrarily set within a range of up ...	10/29/2002
6462698	Wireless communication system using surface acoustic wave (SAW) single-phase unidirectional transducer (SPUDT) techniques SAW devices such as interdigital transducers (IDTs) have been widely used in RADAR applications and as filters. An IDT produces a SAW when excited by a single electrical pulse and can be fabricated to embody a code, which code provides for a passive autoc...	10/08/2002
6289039	Spread-spectrum communications utilizing variable throughput reduction A spread-spectrum system having a transmitted data rate determined by an error rate syndrome at a spread-spectrum receiver. A demultiplexer demultiplexes input data into a plurality of data channels. A plurality of FEC encoders FEC encodes the plurality o...	09/11/2001
6275123	Surface acoustic wave matched filter with dispersive substrate and saw group velocity based output electrode design A surface acoustic wave matched filter for use in a spread spectrum communication system is disclosed. The surface acoustic wave matched filter includes a substrate having dispersity and is composed of a sapphire main body and a piezoelectric aluminum nit...	08/14/2001
6229409	Surface acoustic wave matched filter An output side electrode of a surface acoustic wave matched filter with portions having different delay times between taps. The output side electrode may be provided by arranging parallelly a plurality of output side electrodes having different scales, di...	05/08/2001
6226319	Spread spectrum demodulation circuit, spread spectrum communication apparatus, delay-detection-type demodulation circuit, and delay-detection-type communication apparatus A spread spectrum demodulation circuit includes a correlation signal generator which generates a correlation signal from a reception signal to which a quadrature phase shift keying and a spread spectrum modulation are performed. First and second delay ele...	05/01/2001
6134264	Spread spectrum communication device and communication system It is the object of the invention to provide a structure of a novel spectrum spreading communication device which solves the problem with the conventional spectrum spreading communication using Barker codes, etc. and limits the rise of the side-lobe of a ...	10/17/2000
6061342	Code division multiple access apparatus A code division multiple access apparatus which is capable of high-speed synchronization, is simple in construction and, moreover, achieves reduced consumption of electric power during standby. When a specific pattern contained in a signal received by a r...	05/09/2000
5887025	Matched filter acting in charge domain A charge mode operation circuit dedicated to detect the correlation between analog input signal and digital code, and for realizing by "RAKE method" the path diversity reception from the correlation data obtained using the same. The circuit utilizes an an...	03/23/1999
5867526	Matched filter acting in charge domain A charge mode operation circuit dedicated to detect the correlation between analog input signal and digital code, and for realizing by "RAKE method" the path diversity reception from the correlation data obtained using the same. The circuit utilizes an an...	02/02/1999
5353301	Method and apparatus for combining multipath spread-spectrum signals A method and apparatus for combining multipath spread-spectrum signals are provided. The multipath combining is accomplished by detecting an envelope of an input differential phase shift keyed signal communicated over a communication channel. Subsequently...	10/04/1994
5022047	Spread spectrum correlator An apparatus for decoding a received spread spectrum signal having a data signal modulated with a pseudo-noise code and transmitted as an RF spread spectrum signal. A first reference register holds a first pseudo-noise signal, a second reference register ...	06/04/1991
4969159	Spread spectrum communication system employing composite spreading codes with matched filter demodulator A hybrid despread and demodulation receiver for low symbol rate communications employs a passive (SAW) matched filter to remove a "short" coding portion of a composite spreading code that has been used to spread the data signal. The composite spreading se...	11/06/1990
4672658	Spread spectrum wireless PBX The present invention relates to a wireless PBX network wherein direct sequence spread spectrum multiple access is used for voice and data communications to support a plurality of local-local and local-external calls. The present wireless PBX arrangement ...	06/09/1987
4418393	Matched filter spread spectrum code recovery apparatus Apparatus is provided for decreasing the acquisition time for recovering spread spectrum codes. The transmitted spread spectrum code is preceeded by a sync signal to establish system time at the receiver. The received coded data signals are applied to a m...	11/29/1983

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Class 375/153 - Having SAW or charge-transfer device