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| Number | Title | Issue Date |
| 5612971 | Intermediate frequency receiver apparatus A transmitting and receiving system having two or more radios, each capable of transmitting and receiving a transmission signal on two or more radio frequencies where a first radio transmits on a selected frequency at a predetermined time interval and a s... | 03/18/1997 |
| 5570352 | Digital cellular network/system with mobile stations communicating with base stations using frequency-hopping and having enhanced effect of interference diversity A digital TDMA/FDMA (Time Division Multiple Access/Frequency division Multiple Access) cellular network system, suitable for a microcellular network and to maximize the advantage to be gained from interference diversity, including base stations forming ra... | 10/29/1996 |
| 5499266 | Low-power frequency-hopped spread spectrum acknowledgement paging system An acknowledgement paging system is described which fits within the existing infrastructure of a paging network and which provides low cost manufacture and low power operation while still enabling the acknowledgement paging over long distances. The acknow... | 03/12/1996 |
| 5454010 | System and method for calibration of frequency hopping A system and method for calibrating telecommunications systems employs frequency hopping techniques, and more particularly, employs linked compressor-expander (Lincompex) techniques in the transmission of any combination information waveform such as that ... | 09/26/1995 |
| 5452319 | Method and system for increasing the reliability of multiple frequency communication systems The inherent structure of redundant information fields contained in the message format of a multifrequency communication system is utilized to determine if the information on the individual hops has been degraded due to interference. By detecting bit erro... | 09/19/1995 |
| 5450454 | Coding and decoding a modulated radio frequency signal The invention relates to a method for coding and decoding a radio frequency signal, modulated with a TV program or other message and transmitted from a transmitting center to a plurality of receiver locations, where the coding is effected by shifting, at ... | 09/12/1995 |
| 5432814 | Spread spectrum communication system A spread spectrum communication system in which a spectrum of a communication signal is spread by using a spreading signal includes PN code generators for generating a plurality of pseudo noise codes which differ from each other, and a selector for select... | 07/11/1995 |
| 5412687 | Digital communications equipment using differential quaternary frequency shift keying A digital radio transceiver uses a differential 4-ary frequency shift keying (D4FSK) modulation scheme to achieve a radio that is low cost, miniaturizable, low in power consumption, and high in spectral efficiency. An adaptive digital "slicer" looks at a ... | 05/02/1995 |
| 5400359 | Spread spectrum communication system and an apparatus for communication utilizing this system The present invention relates to a spread spectrum communication system in which a PN code p(t) is generated from a PN generator, data d(t) is multiplied by the PN code p(t) by a multiplier, and multiplied output is subjected to BPSK modulation by a BPSK ... | 03/21/1995 |
| 5377221 | Communications system A frequency hopping radio communications system has a plurality of radios each incorporating a transmitter and a receiver. When a radio is not transmitting or receiving, a switch switches it into a mode in which it monitors the signal strength in each of ... | 12/27/1994 |
| 5377224 | Acquisition of frequency bursts in PCN A method of acquiring frequency bursts in a PCN broadcast control channel, including the steps of: i) sampling PCN r.f. signals for successive blocks of time of duration of half the duration of a frequency burst; ii) determining the first block to have a spect... | 12/27/1994 |
| 5335246 | Pager with reverse paging facility Position determining apparatus including at least one base station including a base transmitter which periodically transmits timing signals and a plurality of mobile remote units. Each remote unit includes a mobile receiver operative to receive timing sig... | 08/02/1994 |
| 5280497 | Communicating on wandering channels For protection of communication against interception by frequent pseudorandom changing of the distribution of transmissions on channels, an input distributive switch is installed before the channel division device of a transmitting system and a similar ou... | 01/18/1994 |
| 5239555 | Frequency hopping signal interceptor An FH interceptor for determining bandwidth, hop number, dwell time, hop e, channel spacing and hop frequencies. A compressive receiver, having a passband greater than the bandwidth, samples received signals at a scan rate greater than the hop rate. On e... | 08/24/1993 |
| 5097485 | HF high data rate modem Methods and apparatus for achieving high frequency (HF) modem communications. A predetermined plurality of frequency hopped, digital phase shift keying modulated tones are generated at a predetermined number of pseudo-randomly generated frequencies during... | 03/17/1992 |
| 5029182 | Automatic gain control (AGC) for frequency hopping receiver The invention is an Automatic Gain Control ("AGC") sampling structure for use with frequency-hopped high frequency waveforms containing known transmitted signals embedded within communications traffic. The sampling structure is a digital structure and an ... | 07/02/1991 |
| 4985899 | Intercept detector for spread-spectrum signals A device for intercepting and decoding spread-spectrum frequency-hopped signals. A bank of frequency domain filters contains a filter for each expected bandwidth in the frequency-hopped signal. Each detector of a bank of detectors detects a pulse and nois... | 01/15/1991 |
| 4956644 | Channelized binary-level radiometer A signal detector for receiving a wide band (W) of frequency-hopped signals which channelizes the incoming signals, via filter banks into a plurality (L) of channels. Magnitude squaring circuits in each channel generate a "power" estimate which is compare... | 09/11/1990 |
| 4935940 | Interference-proof reception of radio signals using frequency hopping techniques Two interference-proof techniques are shown for detecting binary radio sils transmitted by frequency hopping techniques. In the first, the decision as to which type of binary signal is being received is made by first comparing the energy on each mark and... | 06/19/1990 |
| 4933954 | Device for recombination of a message transmitted by a frequency hopping transmitter For recombining a message transmitted by a frequency hopping transmitter at a fast changing transmitting frequency, there are used a digital FFT search receiver for cyclically evaluating the frequency band occupied by the frequency hopping transmitter, at... | 06/12/1990 |
| 4888787 | Receiver apparatus for spread spectrum communication systems Receiver apparatus is provided for processing frequency hopped signals produced by frequency hopping or hybrid spread spectrum communication systems. A received frequency stepped carrier input signal is applied to dispersive delay lines connected in paral... | 12/19/1989 |
| 4847860 | Phase-control system for telecommunications signals received by an adaptive antenna In a receiving station having an adaptive receiving antenna, a phasing system comprises a plurality of reception paths receiving telecommunications signals derived from the same useful signal combined in transmission with a disturbing signal having a freq... | 07/11/1989 |
| 4800390 | Adaptive antenna arrays for frequency hopped systems An adaptive antenna array arrangement for a receiver in a frequency hopped spread spectrum system. The arrangement includes an auxiliary local oscillator (loa) which is hopped sequentially and pseudo-randomly across the spread system independen... | 01/24/1989 |
| 4694466 | Time sharing frequency synthesizer A frequency synthesizer circuit operates in a time shared mode. Thus the frequency synthesizer circuit operates to transmit and/or receive a particular frequency for a chosen small amount of time and then sequentially transmits and/or receives the other f... | 09/15/1987 |
| 4654859 | Frequency synthesizer for frequency hopping communication system A wireless data communications network utilizes a frequency synthesizer to achieve a systematic frequency hopping arrangement wherein frequency is incremented by two times the channel spacing from lowest frequency to highest frequency. When adjusting the ... | 03/31/1987 |
| 4616364 | Digital hopped frequency, time diversity system The digital hopped frequency, time diversity system comprises a first arrangement to provide a binary bit stream having a plurality of groups each having N bits with each of the plurality of N bit being repeated on at least M different frequencies, where ... | 10/07/1986 |
| 4553101 | Fast frequency hopping demodulation system with serial accumulation of signal A system for demodulating a received signal containing repetitive blocks of m frequency hopped pulses having a predetermined hopping sequence. "m" is an integer greater than one. The system includes m filters respectively tuned to the frequencies of the p... | 11/12/1985 |
| 4532636 | Radio communications receivers In radio communications receivers for use on frequency hopping radio communications networks, the received signal in each hop period is analyzed and assigned a quality value. If more than one signal is present during the hop period it is determined that m... | 07/30/1985 |
| 4398296 | Communication systems There is disclosed a communication system wherein the transmitter and receiver synchronously change frequency during transmission of information and wherein each frequency to be used before transmission of information on that frequency is examined and as ... | 08/09/1983 |
| 4388723 | Control device for steerable null antenna processor A radio receiving system partially overcomes jamming and other interference y receiving on a narrow selected frequency which is rapidly changed, i.e., fast frequency hopping (FFH). The system includes a broadband receiving antenna array and a steerable nul... | 06/14/1983 |
| 4383323 | Spread spectrum FH-MFSK transmitter and receiver The present invention relates to transmitters (10) and receivers (30) for use in a spread spectrum radio communication system wherein transmitters generate FH-MFSK signals by adding elements of each user's Q level encoded message sample and that user's un... | 05/10/1983 |
| 4355399 | Adaptive spread spectrum FH-MFSK transmitter and receiver The present invention relates to a transmitter, a receiver and techniques for use in a frequency-hopping, multilevel frequency shift keyed (FH-MFSK) radio system which permits the selective concurrent transmission of one or two encoded frequencies per tim... | 10/19/1982 |
| 4320514 | Spread spectrum FH-MFSK radio receiver The present invention relates to a spread spectrum, FH-MFSK radio receiver capable of demodulating and decoding one or more concurrently received L-length frequency-hopping, Q level frequency shift keyed signals to determine the correct signal of a partic... | 03/16/1982 |
| 4271524 | Spread spectrum FH-MFSK receiver The present invention relates to a majority logic spread spectrum, FH-MFSK radio receiver capable of demodulating and decoding one or more concurrently received L-length frequency-hopping, 2K -ary frequency shift keyed signals to determine the ... | 06/02/1981 |
