Class 375/273 - Combined with phase shift keying

Subclass of Class 375 - Pulse or digital communications
Definition: Subject matter where phase shift keying is combined with
No. of patents: 35
Last issue date: 07/01/2008

Number	Title	Issue Date
7394862	Multi-mode wireless polar transmitter architecture A radio transmitter within a transceiver includes a digital processor and analog circuitry for modulating and transmitting an outgoing digital signal in multiple modes of operation. The digital processor digitally modulates the outgoing digital signal to produce one...	07/01/2008
7305011	Periodic broadcast and location of evolving media content with application to seminar and stroke media Techniques are provided for broadcasting history or coarse representations or both of stroke media and other media. Levels are created for media, and the levels are periodically broadcast. The levels segment the media and allow the media to be examined with details ...	12/04/2007
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
7016657	Apparatus, and associated method, for communication system utilizing space-generated multilevel coding Apparatus, and an associated method, for forming a space-generated multilevel coding scheme for a radio communication system. Two or more modulators are positioned at a sending station. The modulators modulate, pursuant to separate modulation schemes, data that is t...	03/21/2006
7012936	Initializing method and data transmitter A first initialization pattern signal is a signal in which a maximum signal level and a minimum signal level appear alternately, and a second initialization pattern signal is a signal in which all signal levels appear in a predetermined arrangement. In a ring-shaped...	03/14/2006
7012965	High speed leading or trailing bit value detection A method and digital circuit to locate and output a binary encoded position of a leading one in an input string of bits. A plurality of input encoders are used, each configured to accept as input equal length sub-strings of the original input string and further conf...	03/14/2006
6977965	Phase shift key burst receiver having improved phase resolution and timing and data recovery A receiver includes an I-Q demodulator (135) responsive to the I and Q components carried on a first frequency signal line (132). A demodulator frequency generator (275) generates a demodulating signal to extract the carried I and Q components. ...	12/20/2005
6901246	Suppressed cycle based carrier modulation using amplitude modulation A sinusoidal RF carrier is modulated for the transmission of digital binary data streams through the amplitude suppression of carrier wavelets. These wavelets are defined between zero crossover positions representing zero energy locations. This modulation is accompl...	05/31/2005
6836181	FSK demodulation system A FSK demodulation system of the present invention has a means for comparing two preset values across 0, a positive side level shift amount and a negative side level shift amount, with an inputted amplitude level; and a demodulation means for performing demodulation...	12/28/2004
6625231	Adaptive phase demodulation Based on changing reception conditions, a wireless receiver adapts its demodulation method during active communications. Phase errors detected in the received signal indicate current reception conditions, and, optionally, received signal strength serves a...	09/23/2003
6621863	Equalizing apparatus combining amplitude error with squared envelope error according to variable weights An equalizer providing a filtered signal to a data decision unit calculates an amplitude error signal by comparing the filtered signal with the data signal output from the data decision unit, and calculates a squared envelope error signal from the filtere...	09/16/2003
6567474	Digital wireless phone/modem jack capable of communications over the power lines using differential binary phase shift keying (DBPSK) A system for communicating signals between a transmitter and a receiver using digital modulation techniques is provided. This invention is particularly adapted to meet the requirements of power line communication. In one preferred embodiment of this inven...	05/20/2003
6445745	Phase encoding methods for handling multiple phase modulated signals on a single channel A method for phase encoding DPSK and N-PSK which maintains phase continuity and which does not require any reference symbols when using N-PSK. A sequence of known DPSK phases are encoded with respect to an initial phase. The N-PSK phases are then all offs...	09/03/2002
6385233	Unbalanced quadrature waveform A method 1100 and apparatus 1200 utilizing unbalanced modulation for providing users in a communication system with different amounts of effective communication energy according to their individual communication environments. A user's communication energy...	05/07/2002
6373883	Radio receiver and a radio transmitter A radio receiver is adapted to receive radio signals in at least two frequency bands, in which the radio signals are modulated by information signals. The radio receiver includes a device for down-converting a received radio signal to an intermediate freq...	04/16/2002
6118827	Apparatus for providing increased data rates within existing modulation systems A method for increasing data rates within a modulated signal is disclosed. Initially, a first and second bit streams are interleaved together to form an interleaved output bit stream. The interleaved output bit stream is modulated in a manner such that up...	09/12/2000
5692007	Method and apparatus for differential phase encoding and decoding in spread-spectrum communication systems with continuous-phase modulation A method and apparatus for phase encoding and decoding a CPM spread spectrum signal. A transmitter divides a data stream into a data symbol portion and an associated phase information portion. The data symbol portion is used to select one of a plurality o...	11/25/1997
5648985	Universal radio architecture for low-tier personal communication system An integrated circuit chip set is provided for use in a radio communication system in which a modulated digital input signal is processed for transmission and a modulated signal received from an antenna is processed to provide an output signal, wherein th...	07/15/1997
5602868	Multiple-modulation communication system A multiple-modulation communication system includes a transmitter that modulates and transmits communication signals modulated by a first modulation technique and communication signals modulated by a second modulation technique. The first modulation techn...	02/11/1997
5598435	Digital modulation using QAM with multiple signal point constellations not equal to a power of two Data are transmitted using multiple carriers modulated by quadrature amplitude modulation. In general, the carriers carry different numbers of bits, to exploit the fact that the properties of a transmission path are more favorable to carriers at some freq...	01/28/1997
5457708	Method and apparatus for signal modulation and detection The disclosure relates to methods and apparatus for separating radio signals arriving from different directions and for multiplexing signals intended for receivers dispersed in different directions. The methods and apparatus employ a plurality of antennas...	10/10/1995
5450451	Apparatus for generating a synchronizing signal A synchronizing signal generating apparatus generates a synchronizing signal from digital data in which a synchronizing signal formed of a fixed data pattern having a predetermined bit number is inserted at a predetermined time interval L. The synchronizi...	09/12/1995
5386202	Data communication modulation with managed intersymbol interference A communication system (10) includes a modulation section (12) and a demodulation section (14). The modulation section (12) performs frequency modulation in accordance with a frequency trajectory signal (28, 30, 32). An intersymbol interference (ISI) pred...	01/31/1995
5091705	FM modulator A modulation signal is digitally integrated by an integration circuit and then phase-modulated by a phase modulating circuit. The integrated modulation signal is converted in phase modulating circuit to first and second digital modulation signals having p...	02/25/1992
4843615	CPFSK communication system employing nyquist-filtered modulator/demodulator An improved narrowband continuous phase modulation system incorporates a filtering mechanism in the transmitter and receiver sites that enables the radiated spectrum characteristic to have a substantially reduced response at frequencies other than the cha...	06/27/1989
4745566	Angle modulated waveform synthesizer An angle modulated periodic waveform is synthesized by generating three digital number sequences. In a first number sequence, one number thereof is generated on each occurrence of a periodic clock signal and has a magnitude which is a selected first perio...	05/17/1988
4691342	Multi-speed, full duplex modem A multi-speed, full duplex modem is disclosed for transmitting and receiving analog signals over a telephone network in communication with a remote modem. The analog signals are converted to digital data for processing by a signal processor and a microcom...	09/01/1987
4625318	Frequency modulated message transmission A data signal is encoded as frequency modulation by selecting carrier sources of different phases in response to data signals and filtering the resultant wave to produce an output deviating from the carrier frequency for one signal time in response to a s...	11/25/1986
4575858	PSK modulation by temporarily increasing frequency to achieve phase change A phase modulation low power integrated circuit communications arrangement which employs a frequency shift oscillator is disclosed. The frequency shift oscillator operates normally at a first frequency and is keyed to a second frequency for brief interval...	03/11/1986
4435824	Communication system having improved differential phase shift keying modulation A communication system which generates an output signal of a selected primary frequency having digital data bits serially modulated thereon by utilizing a hybrid differential phase shift keyed (DPSK) modulation is provided. The improved DPSK modulation is...	03/06/1984
4290140	Combined coherent frequency and phase shift keying modulation system A system of modulation and demodulation for the transmission of binary data in the presence of multipath. The binary data modulates the phase of the carrier and the same binary data, after a delay of "δ" bits, also modulates the frequency of the carrier....	09/15/1981
4215425	Apparatus and method for filtering signals in a logging-while-drilling system The disclosure is applicable for use in a logging-while-drilling apparatus for obtaining subsurface measurements during drilling in a fluid-filled borehole. Acoustic carrier waves are generated downhole in the borehole fluid and are PSK modulated in accor...	07/29/1980
4215427	Carrier tracking apparatus and method for a logging-while-drilling system The disclosure is applicable for use in a logging-while-drilling apparatus for obtaining subsurface measurements during drilling in a fluid-filled borehole. Acoustic carrier waves are generated downhole in the borehole fluid and are PSK modulated in accor...	07/29/1980
4193030	Frequency hopping communication system A signal modulated with information is hopped to discrete frequencies and its phase is selected to be 0° or 180° in each frequency hop interval under control of a pseudo noise binary code signal produced by a code generator. The discrete frequencies are...	03/11/1980
4030033	Method and apparatus for transmitting messages to and from remote locations A method and apparatus for transmitting a message, in digital form, to or from a remote location. In a transmitter, a sequence of predetermined multiple-bit phase codes corresponding to the individual characters in the message phase modulate a carrier wav...	06/14/1977

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Class 375/273 - Combined with phase shift keying