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| Number | Title | Issue Date |
| 5343495 | Method of multipath dsss communications Method of demodulating a signal including a plurality of time-dispersed signal components such as resulting from receiving in a multipath environment. A plurality of correlators are provided. The period of expected time uncertainty is scanned to identify ... | 08/30/1994 |
| 5335359 | Diversity receiver using matched filter and decision feedback equalizer In a digital radio communications system, a transmit signal is delayed and sent on a first diversity channel and a nondelayed version of the signal sent on a second diversity channel. At the receiving site, first and second diversity channel signals are r... | 08/02/1994 |
| 5325394 | Method and apparatus for canceling spread-spectrum noise A spread-spectrum noise canceller (182) is provided. A received phase and a received amplitude for a first (216) and a second (236) component of a received spread-spectrum signal (200) is determined. The second component (236) is structurally similar to [... | 06/28/1994 |
| 5315615 | DSSS communications correlation Method of processing a direct sequence spread spectrum communication system signal wherein digital data comprised of data bits is modulated by a first pseudo-noise code comprised of a sequence of chips, the pseudo-noise chip rate greater than said date bi... | 05/24/1994 |
| 5313490 | Acquisition apparatus for DSSS communications Apparatus for indicating the end of an acquisition procedure between a transmitter and receiver in a direct sequence spread spectrum communications system. A transmitter generates a first acquisition code having a first acquisition code period and compris... | 05/17/1994 |
| 5283780 | Digital audio broadcasting system A digital audio broadcasting system that is capable of providing a large number of high quality stereophonic channels to mobile receivers in an environment with severe multipath delay and fading. Optimum combination of frequency and time diversity to guar... | 02/01/1994 |
| 5280631 | Polarization diversity system suitable for radio communication in indoor space A polarization diversity radio communication system suitable for radio communication in indoor space is provided for transmitting from a transmitter a series of data sequentially from one of two or more transmission antennas of the transmitter, and for re... | 01/18/1994 |
| 5263191 | Method and circuit for processing and filtering signals A method for processing electrical signals includes the steps of: storing a plurality of first digital data signals each representative of an instantaneous amplitude of a first input signal in a memory; selecting one of the first digital data signals in r... | 11/16/1993 |
| 5252914 | Method of constructing and testing a circuit board designed for early diagnostics An apparatus and method of modular electronic printed circuit board design for a radio communication transceiver in which the electronic circuitry forming a transmit/receive circuit board of the device is modularized in such a manner as to facilitate inde... | 10/12/1993 |
| 5249233 | Multipath noise minimizer for radio receiver A frequency modulation (FM) stereo broadcast receiver detects the onset of multipath interference and initiates corrective action to minimize the audible effects of multipath. Under an unacceptable multipath interference condition, a multipath detection s... | 09/28/1993 |
| 5233626 | Repeater diversity spread spectrum communication system A repeater diversity spread spectrum communication system provides substantially fade free communications between a transmitter (1) and a receiver (7). A transmitted signal is relayed through a plurality of linear communications repeaters (3-6) that produ... | 08/03/1993 |
| 5230077 | Method of reducing the power requirements in a mobile radio receiver In a receiving circuit of a mobile telephone apparatus the incoming baseband signals are demodulated and equalized so as to compensate for deficiencies (multipath propagation) of the radio medium between base station and mobile telephone apparatus. It is ... | 07/20/1993 |
| 5179444 | System for echo cancellation comprising an improved ghost cancellation reference signal A television receiver comprising a system for improved echo cancellation. The system features a superior ghost cancellation reference signal which exhibits improved performance in noisy environments and which exhibits the flat and wide bandwidth necessary... | 01/12/1993 |
| 5172232 | Method and apparatus for communication channel identification and signal restoration A method and apparatus for improved ghost cancellation for use in particular in television receivers. The sequence of coefficients derived from a received GCR signal, is further processed to effect a transfer of energy from minor echo coefficients to majo... | 12/15/1992 |
| 5155469 | Wireless alarm system In a wireless alarm system an arrangement for increasing the reliability that messages will be received is provided. Each transmitter transmits an alarm message a plurality of times with delays between the messages. Successive delay times are of different... | 10/13/1992 |
| 5127051 | Adaptive modem for varying communication channel An improved modem system for HF data transmission over a varying communication channel transmits data in packets formatted into successive frames, each having two identical training sequences following a sequence of data. Each training sequence has a time... | 06/30/1992 |
| 5121211 | System for echo cancellation comprising an improved ghost cancellation reference signal A system for improved echo cancellation for use in particular in television receivers. The system features a superior ghost cancellation reference signal which exhibits improved performance in noisy environments and which exhibits the flat and wide bandwi... | 06/09/1992 |
| 5111298 | Method and apparatus for communication channel identification and signal restoration A method and apparatus for improved ghost cancellation for use in particular in television receivers. The sequence of coefficients derived from a received GCR (Ghost Cancellation Reference) signal, is further processed to effect a transfer of energy from ... | 05/05/1992 |
| 5095535 | High bit rate communication system for overcoming multipath A communication system for relatively high data bit rate RF communication overcomes multipath interference by employing relatively narrow beam antenna sectors and by selecting the best communication path established between two terminals, at least one of ... | 03/10/1992 |
| 5091917 | Method and apparatus for pulse sorting A method and apparatus for associating received pulses with one of a plurality of emitters emitting pulses at periodic intervals. Periodic pulse trains are detected by computing the difference in arrival times between each received pulse and a fixed numbe... | 02/25/1992 |
| 5062148 | Multi-path fading simulator In accordance with the teachings of this invention, a multi-path distortion simulator is constructed having two paths, one path including a delay means, and both paths including phase shifters and attenuators. The phase shifters are closely matched, there... | 10/29/1991 |
| 5047859 | Method and apparatus for communication channel identification and signal restoration A test signal is transmitted over a communication channel and the signal is received by a receiver. The temporal evolution of the test signal is represented in a matrix and the inverse of the test signal evolution matrix is stored in the receiver. Samples... | 09/10/1991 |
| 4977607 | Method of generating an RF signal modulated by a message signal and distorted by a predetermined fading profile for testing RF receivers, and apparatus for carrying out the method including a fading simulator For generating an RF signal modulated by a message and distorted by a predetermined fading profile for testing RF receivers, a sequence of digital phase and amplitude values which corresponds to the message modulation is arithmetically processed by a pred... | 12/11/1990 |
| 4878252 | Modified multi-path detector A receiver comprising a multi-path detector which comprises a frequency noise peak detector, an AM-detector and a weighting circuit. When noise peaks and amplitude modulations occur in an antenna input signal selected by a diversity switch on account of a... | 10/31/1989 |
| 4852090 | TDMA communications system with adaptive equalization A method and means for reducing multipath interference distortion in a time-division multiple access (TDMA) communications system is disclosed. A transmitting station (100) formats one or more equalizer synchronization words with a first user's data word,... | 07/25/1989 |
| 4742568 | Receiver for antenna switching diversity systems A receiver comprising a switching circuit responsive to an antenna switching signal for switching between two antennas to produce a received signal, a noise estimating circuit for estimating the quantity of noise from the received signal, and an integrati... | 05/03/1988 |
| 4726038 | Digital communication system The present invention provides a communication system which employs a signal whose carrier phase is shifted by a constant amount Ɗθ per time slot in correspondence to each symbol (1 or 0) transmitted, and the phase shift is performed by Ɗθ/2 (or -Ɗθ... | 02/16/1988 |
| 4726073 | Receiver including a multipath transmission detector A diversity receiver includes a multipath transmission detector which, upon detecting multipath distortion of a received angle-modulated input signal, switches to an alternative receiving antenna. If such a receiver has high selectivity, the detector may ... | 02/16/1988 |
| 4694500 | Control voltage generating circuit for activating a noise reduction circuit in an FM stereo receiver A high-cut and high-blend control voltage generating circuit for activating a noise reduction circuit of an FM stereo receiver is configured to be simply responsive to multipath noises and never to plug noises. A changing and discharging circuit in the co... | 09/15/1987 |
| 4679248 | Test equipment for simulating multipath interference The invention relates to a device for simulating multipath interference in order that the correction stages of a radio receiver can be tested. The device includes parallel paths, simulating the multipath environment, and a pilot tone generator for introdu... | 07/07/1987 |
| 4675880 | Antimultipath communication by injecting tone into null in signal spectrum A transmitter for digital radio communication creates a null by balanced encoding of data modulated on an RF carrier, and inserts a calibration tone within the null. By having the calibration tone coincide in phase and frequency with the transmitted radio... | 06/23/1987 |
| 4672638 | Multipath canceller for cancelling a distortion caused to a radio frequency pulse by multipath transmission For use in cancelling a distortion caused by multipath transmission to an original radio frequency pulse of an original pulse shape, a multipath canceller comprises a priliminary circuit for producing a distortionless pulse of the original pulse shape and... | 06/09/1987 |
| 4669091 | Adaptive multipath distortion equalizer A communication system transmits information which may be in the form of frames or bursts of suppressed-carrier data over a dispersive transmission path which introduces multipath distortion. Each frame is stored as it is received and processed by iterati... | 05/26/1987 |
| 4628517 | Digital radio system Frequency diversity is employed to counter selective fadings as a result of multi-path propagation for troposcatter and short-wave connections for digital useful signals employing frequency modulation. For this purpose, the digital useful signal is suppor... | 12/09/1986 |
| 4606040 | Transmitting-receiving station for a system for transmitting data by frequency hopping A transmitting-receiving station for transmitting information by frequency hopping comprises a code generator to define the use of a plurality of channels in accordance with a high-speed skip law for a transmitting-receiving station in the stand-by mode, ... | 08/12/1986 |
| 4590615 | Multipath distortion reducing circuit A multipath distortion reducing circuit particularly adapted for use with stereophonic receiving circuits in which the amount of mixing between right and left channels is reduced. In accordance with the invention, the envelope of the received FM signal is... | 05/20/1986 |
| 4587662 | TDMA spread-spectrum receiver with coherent detection To utilize indirect-path signals in a receiver for fixed and mobile transmitter-receiver stations of a TDMA spread-spectrum digital radio system, coherent detection is employed. At the same time, the signal imaging the multipath profile is continuously re... | 05/06/1986 |
| 4566133 | Switched diversity method and apparatus for FM receivers An FM diversity receiver system and method are disclosed which include two antennas and a switch for switching the receiver from one antenna to the other. A fade control signal is produced which is related to the received FM signal, in which fade control ... | 01/21/1986 |
| 4457007 | Multipath interference reduction system A multipath interference reduction system for mobile subscriber access systems, each occupying one of a plurality of time slot channels. Interference caused by multipath returns is eliminated in the receiver portion of digital signal communications appara... | 06/26/1984 |
| 4442426 | Signal transmission Plural transmitters, which transmit signals to a common receiver, transmit their signals in a fixed time-staggered pattern. As a result, the individual signals which are transmitted by the respective transmitters do not interfere with one another or influ... | 04/10/1984 |
