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| Number | Title | Issue Date |
| 7868689 | Low power slicer-based demodulator for PPM An apparatus and method for communications is disclosed. The apparatus includes a slicer configured to generate samples of a signal carrying information, and a demodulator having a digital integrator configured to integrate the samples, the demodulator being further... | 01/11/2011 |
| 7414463 | 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, integrator and comparators for integrating the absolute value signal ... | 08/19/2008 |
| 7388911 | In-band-on-channel broadcast system for digital data An FM broadcast transmitter transmits a broadcast signal having a carrier at a broadcast frequency and sidebands, able to be transmitted at full power, within a transmission bandwidth around the carrier. It includes a source of a modulated FM stereo signal having a ... | 06/17/2008 |
| 7349471 | PPM receiving system and method using time-interleaved integrators A communication receiver (30) includes a data receiver (34) that receives a pulse-position modulated signal (38). A clock circuit (70) separates a reference clock signal (36) into multiple coordinating clock signals A, B, and C. Mu... | 03/25/2008 |
| 7349458 | Linear receivers for time-hopping impulse radio systems In a time-hopped impulse radio system, each symbol is transmitted over a channel having different multipath components as a set of Nf frames. Each frame includes one pulse. All frames of a received signal corresponding to the symbol are sampled to generat... | 03/25/2008 |
| 7336736 | Method of detecting and processing pulsed signals in a radio signal The invention allows the detection and processing in a radio signal received by a receiver, of any signal of “pulsed” type present in radio signals applied to the input of a radiofrequency receiver, the receiver having an analogue/digital converter for performin... | 02/26/2008 |
| 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, integrator and comparators for integrating the absolute value signal ... | 05/22/2007 |
| 7088795 | Ultra wide band base band receiver The present invention is a receiver having a radio frequency (RF) front end, a pulse detector operatively coupled to the RF front end, and a data recovery unit operatively coupled to the pulse detector. The data recovery unit is configured to receive spread spectrum... | 08/08/2006 |
| 7035246 | Maintaining a global time reference among a group of networked devices Synchronization is maintained among a plurality of network devices having local clocks that participate in a network. A first packet is broadcast from a first network device to other network devices that participate in the network. The first packet includes a global... | 04/25/2006 |
| 7031294 | Baseband wireless network for isochronous communication A wireless communication network system apparatus which provides for isochronous data transfer between node devices of the network, which provides at least one master node device which manages the data transmission between the other node devices of the network, whic... | 04/18/2006 |
| 6976034 | Method of transmitting data including a structured linear database A method, system and type of database for transmitting data is disclosed in which the data is organized into a structured linear database. The structured linear database includes a routing header portion, a file allocation table, a data portion and a tailbit portion... | 12/13/2005 |
| 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 based correlator for performing the spreading and de-spreading functi... | 11/29/2005 |
| 6944148 | Apparatus and method for managing variable-sized data slots within a time division multiple access frame A reliable Medium Access Control layer protocol and method employing centralized management of communication in a Time Division Multiple Access network architecture. The Medium Access Control layer protocol implements Quality of Service guaranties to the layers of t... | 09/13/2005 |
| 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 frame clock synchronized to frame occurrence timing, SS-PPM signal ge... | 09/06/2005 |
| 6903603 | Phase detection circuit and receiver A quadrant deciding section decides the quadrant to which a received signal belongs based on a baseband signal. A rotation projector rotates the received signal and projects the rotated signal to a straight line that intersects orthogonally at the origin with a stra... | 06/07/2005 |
| 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 modulation system. More particularly, depending on parameters of the pulse p... | 09/07/2004 |
| 6700931 | Method, system and apparatus for initiating and maintaining synchronization of a pulse position modulation (PPM) decoder with a received PPM signal A radio frequency identification (RFID) tag device having a pulse position modulation (PPM) decoder circuit which calculates a relative frequency relationship between an internal clock-oscillator of the RFID tag device and an external PPM source such as a... | 03/02/2004 |
| 6566941 | Method and device of phase detection in phase modulation systems The invention discloses a phase detection method including a quadrant determining procedure, a first comparison procedure, a second comparison procedure, a coordinate transforming procedure, and a phase computing procedure. A first and a second phase appr... | 05/20/2003 |
| 6442200 | Modulating circuit, demodulating circuit and modulating and demodulating circuit system, using PPM method A demodulating circuit demodulates a PPM signal obtained as a result of modulation performed in accordance with a PPM method. This circuit includes a detecting portion and a control portion. The detecting portion detects a predetermined carrier pulse prov... | 08/27/2002 |
| 6426716 | Modulated pulse doppler sensor A range gated microwave motion sensor having adjustable minimum and maximum detection ranges with little response to close-in false alarm nuisances such as insects or vibrating panels. The sensor resolves direction of motion and can respond to target disp... | 07/30/2002 |
| 6359525 | Modulation technique for transmitting multiple high data rate signals through a band limited channel A digital data modulator includes a source of a plurality of digital data signals having a common data bit period. A plurality of encoders each encode a corresponding one of the plurality of digital data signals using a variable pulse width code having ed... | 03/19/2002 |
| 6310906 | Chaotic carrier pulse position modulation communication system and method A chaotic carrier pulse position modulation communication system and method is disclosed. The system includes a transmitter and receiver having matched chaotic pulse regenerators. The chaotic pulse regenerator in the receiver produces a synchronized repli... | 10/30/2001 |
| 6295318 | Method and system for increasing the data rate over twisted copper pairs and other bandwidth-limited dedicated communications facilities A system and associated methods that use separate paths to send amplified data. The method expands, or amplifies, the amount of data that can be transmitted over a dedicated bandwidth-limited communications medium by using a first channel for transmitting... | 09/25/2001 |
| 6292051 | Architecture of non-synchronous open loop demodulation circuit in pulse position modulation A simple demodulation circuit having a reduced hardware cost and an increased using flexibility is provided. Such architecture is used in a pulse position modulation for retrieving a data from a received source signal and includes a transformation circuit... | 09/18/2001 |
| 6252453 | Device and method for signal resampling between phase related clocks A method for demodulating a modulated carrier includes sampling the modulated carrier with an A/D converter clocking at a first sampling frequency to generate a modulated carrier series of samples occurring at the first sampling frequency. The first sampl... | 06/26/2001 |
| 6219380 | Pulse position modulation based transceiver architecture with fast acquisition slot-locked-loop A transceiver has a pulse position modulation (PPM) encoder, automatic gain control (AGC) circuit and timing recovery circuit. The PPM encoder illustratively has a frequency divider, slot selector, and mixer. The frequency divider divides the frequency of... | 04/17/2001 |
| 6205169 | Spread spectrum pulse position modulation communication system A first spread spectrum pulse position modulated signal with a pseudonoise code is generated. A second spread spectrum pulse position modulated signal with an inverted pseudonoise code is generated. A third spread spectrum pulse position modulated signal ... | 03/20/2001 |
| 6169765 | Apparatus and method for output signal pulse width error correction in a communications receiver An output signal pulse width error correction circuit and method wherein errors in a data signal conforming to a communications protocol having a prescribed duty cycle are corrected by monitoring a duty cycle of the data signal, comparing the duty cycle t... | 01/02/2001 |
| 6108376 | Reception and demodulation of widely spaced pulse position modulated signals A system for receiving information encoded in a train of pulse position modulated signals and then decoding the pulse train to produce amplitude modulated signals representing the original information includes a circuit for detecting the beginnings of suc... | 08/22/2000 |
| 6081493 | Apparatus for demodulating digital FM signal in an optical disc device In a demodulator for a digital FM signal, the received digital FM signal is verified at the data bit boundaries for inversion to detect errors. If an uninverted data bit boundary is detected, those sections of the digital FM signal just preceding and just... | 06/27/2000 |
| 6066982 | Phase locked loop apparatus for pulse signal demodulation A pulse position modulation pulse signal to be demodulated is sampled by a pulse detection part based on a motion clock. The motion clock is generated from a motion clock generating part so that a period of pulse precision n falls within a width of an inf... | 05/23/2000 |
| 5977822 | Method and apparatus of pulse position demodulation A method and apparatus for pulse position demodulation begins by receiving a pulse that is positioned approximately at one of a plurality of time intervals within a time chip, where the pulse has a pulse width that is greater than each of the plurality of... | 11/02/1999 |
| 5907528 | Apparatus for demodulating a digital FM signal which normally has signal inversions at data bit boundaries In a demodulator for a digital FM signal, the received digital FM signal is verified at the data bit boundaries for inversion to detect errors. If an uninverted data bit boundary is detected, those sections of the digital FM signal just preceding and just... | 05/25/1999 |
| 5844942 | Pulse position modulation communications protocol A method for modulating a radio signal has the steps of: predetermining a first time interval so as to define a data word; generating a synchronization pulse, the synchronization pulse initiating a single data word having a length of the predetermined fir... | 12/01/1998 |
| 5790032 | Method of and apparatus for detecting living bodies An apparatus detects living bodies, in particular human living bodies, by ectromagnetic signals. The apparatus has a receiver device for electromagnetic signals that includes a device for obtaining frequency components that are characteristic in respect t... | 08/04/1998 |
| 5694435 | Digital method of detecting pulses of short duration and arrangement for implementing the method The invention relates to a digital method of detecting pulses of short duration and an arrangement for implementing the method. A threshold value is generated by means of a statistical procedure which is common in radar engineering, by means of which shor... | 12/02/1997 |
| 5691665 | PPM demodulation device A clock reproduction unit provides a reproduced clock signal from a received PPM signal. The results of sampling the PPM signal with a reproduced clock signal is held by a sample result holding unit. Symbol synchronization is achieved from a received PPM ... | 11/25/1997 |
| 5661754 | Receiver arrangement An infrared remote-control receiver employs at its front end a gyrator-configured transistor operating as a current-to-voltage converter, but derives its data information from a negative-going gyrator output pulse in preference to the more conventionally ... | 08/26/1997 |
| 5633742 | Optical data communication and location apparatus, system and method and transmitters and receivers for use therewith An optical data communication and location apparatus for at least one location in a facility having at least one receiver at said at least one location. A plurality of portable transmitters provides optical wireless data links with the receiver. Each of t... | 05/27/1997 |
| 5446421 | Local oscillator phase noise cancelling modulation technique A data transmission system includes a source of a data signal and a modulator, responsive to the data signal, producing a first modulated signal representing the data signal and a second modulated signal representing a signal 180 out-of-phase with the dat... | 08/29/1995 |
