| 5295152 |
TDMA for mobile access in a CDMA system |
| Mar-15-1994 |
A method and system for increasing the capacity of radiotelephone communication systems by eliminating interference to communication traffic caused by random access bursts from unconnected mobile station... |
| 5291555 |
Communication using synchronized chaotic systems |
| Mar-1-1994 |
A chaotic transmitter (100) operates according to preselected chaotic protocols, such as a set of Lorenz equations. Modulation is accomplished by modifying a predetermined parameter of the set of chaotic... |
| 5291517 |
Carrier freuency corrector for a DSSS communication system |
| Mar-1-1994 |
A carrier frequency corrector for a receiver for use in a direct sequence code division multiple access communication system having a carrier frequency consisting of an expected carrier frequency and a... |
| 5291515 |
Spread spectrum communication device |
| Mar-1-1994 |
On the transmitter side, data to be transmitted are converted into a plurality of parallel data sets by a serial-parallel converter 101 and spread spectrum modulation is effected by means of PN code generators... |
| 5289496 |
Method and system for radio communication |
| Feb-22-1994 |
In a frequency hopped radio communication system wherein a control signal and a speech signal are transmitted together and the speech signal is transmitted via a predetermined set of frequency bands, method... |
| 5285470 |
Methods of noise-reduced and bandwidth-reduced television transmission |
| Feb-8-1994 |
A noise-reduced method of transmitting a video signal including separating the video signal into a plurality of frequency subbands representing a corresponding plurality of subband images, each of which... |
| 5283807 |
EMI suppression coding |
| Feb-1-1994 |
EMI suppression technique that pseudorandomizes the positive or negative going transitions that are used to represent one binary state in a transmitted digital signal such as in an MTL-3 data format. By... |
| 5282222 |
Method and apparatus for multiple access between transceivers in wireless communications using OFDM spread spectrum |
| Jan-25-1994 |
A method for allowing a number of wireless transceivers to exchange information (data, voice or video) with each other. A first frame of information is multiplexed over a number of wideband frequency bands... |
| 5280538 |
Spread spectrum demodulator |
| Jan-18-1994 |
A spread spectrum demodulator for use with a phase-shift-keying modulated spread spectrum signal used in mobile satellite communications. An objective of the spread spectrum demodulator is to perform tracking... |
| 5280497 |
Communicating on wandering channels |
| Jan-18-1994 |
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... |
| 5278862 |
Timing for spread-spectrum communication across noisy media |
| Jan-11-1994 |
A method of transmitting and receiving data packets across a noisy communication medium, e.g., an AC power line. The data packets are transmitted using spread-spectrum chirps. A first sequence of the chirps... |
| 5274665 |
Polyopoly overlapping spread spectrum communication system and method |
| Dec-28-1993 |
Two, three or more competitive personal communications network spread spectrum systems share spectrum without interfering with each other, without significantly decreasing the chip rate of each PCN system,... |
| 5274666 |
Wireless communication system |
| Dec-28-1993 |
A wireless communication system allow two-full two-way communication among a net or loop of stations. Each station is in direct communication with another member of the net such that a logical communication... |
| 5272721 |
Spread spectrum receiving device |
| Dec-21-1993 |
A spread spectrum receiving device using a correlator in an IF stage of the receiving device is disclosed, which is so constructed that interference wave or disturbing wave is removed by subjecting the... |
| 5268926 |
Method and apparatus for the simultaneous transmission of separate data signals |
| Dec-7-1993 |
A method of simultaneously transmitting first and second data signals by the technique of spectrum spreading by direct sequence, comprises using the first data signal to modulate a spreading code produced... |
| 5267262 |
Transmitter power control system |
| Nov-30-1993 |
A power control system for a cellular mobile telephone system in which system users communicate information signals between one another via at least one cell site using code division multiple access spread... |
| 5267260 |
Spread spectrum receiver using the code division multiple access mode |
| Nov-30-1993 |
A receiver operated using a spread spectrum code division multiple access mode includes integrators for respectively integrating two signals of an in-phase channel and a quadrature channel, a comparator... |
| 5265119 |
Method and apparatus for controlling transmission power in a CDMA cellular mobile telephone system |
| Nov-23-1993 |
A power control system for a cellular mobile telephone system in which system users communicate information signals between one another via at least one cell site using code division multiple access spread... |
| 5263050 |
Adaptive threshold in a spread spectrum communications system |
| Nov-16-1993 |
A transceiver for transmitting and receiving spread spectrum signals having an adaptive threshold for distinguishing between valid receive data signals and noise. The transceiver includes a transmitter... |
| 5263046 |
Spread-spectrum chirp communication with sharply defined bandwidth |
| Nov-16-1993 |
Communication apparatus and method that includes generating a series of successive spread-spectrum chirp signals, which are progressively swept within a defined bandwidth. The chirps are divided into two... |
| 5263045 |
Spread spectrum conference call system and method |
| Nov-16-1993 |
A spread spectrum communications system for use over a communications channel, including a transmitter-generic-chip-code generator, a transmitter-message-chip-code generator, an EXCLUSIVE-OR gate, a combiner,... |
| 5263048 |
Narrow band interference frequency excision method and means |
| Nov-16-1993 |
In a preferred embodiment, a method for excising narrow band interferers in a spread spectrum signal communication which includes the steps of: receiving the spread spectrum signal; digitizing the spread... |
| 5260969 |
Spectrum diffusion communication receiving apparatus |
| Nov-9-1993 |
A spectrum diffusion communication receiving apparatus includes a first generating unit for generating a reference code, a second generating unit for generating a reference signal in synchronism with the... |
| 5258996 |
Spread spectrum apparatus |
| Nov-2-1993 |
For use in a spread spectrum communication system there is provided in an embodiment of the invention a spread spectrum transmitter which uses a voltage controlled oscillator (VCO) for generating a carrier... |
| 5257283 |
Spread spectrum transmitter power control method and system |
| Oct-26-1993 |
A power control system for a cellular mobile telephone system in which system users communicate information signals between one another via at least one cell site using code division multiple access spread... |
| 5253268 |
Method and apparatus for the correlation of sample bits of spread spectrum radio signals |
| Oct-12-1993 |
A spread spectrum receiver correlator for a with filters matched to transmitter chip codes are implemented in digital circuits along with a digital circuit for acquisition and tracking of the arrival times... |
| 5245628 |
Enhanced L1/L2 code channel for global positioning system receivers |
| Sep-14-1993 |
An enhanced P-code channel (60) for use in a GPS receiver (10) to simultaneously track L1 and L2 comprises a P-code clock generator (62) for generating two code clocks. The first code clock associates... |
| 5241562 |
Spread spectrum communications system |
| Aug-31-1993 |
A spread spectrum communication system for direct sequence transmission of digital information having a modulation format which is particularly suitable for indoor communication within residential, office... |
| 5241563 |
Method and apparatus for communicating interleaved data |
| Aug-31-1993 |
An interleaver processes information in a pseudorandom order to provide pseudorandom interleaved data for communication to a deinterleaver. The pseudorandom interleaved data is processed at the deinterleaver... |
| 5239557 |
Discountinuous CDMA reception |
| Aug-24-1993 |
A cellular radio telephone system employs discontinuous transmission and reception of speech signals to conserve receiver processing resources. A frame structure is imposed on digitized speech data to... |
| 5237587 |
Pseudo-noise modem and related digital correlation method |
| Aug-17-1993 |
A pseudo-noise (PN) correlation and demodulation method and apparatus, in which received signals are correlated with locally generated PN codes and correlation measurements are maintained for multiple... |
| 5237586 |
Rake receiver with selective ray combining |
| Aug-17-1993 |
A modified RAKE receiver, referred to as a WRAKE receiver, is used in CDMA communications. It is particularly adaptable to a subtractive CDMA system. The receiver includes a radio receiver for receiving... |
| 5235612 |
Method and apparatus for cancelling spread-spectrum noise |
| Aug-10-1993 |
A spread-spectrum noise canceller (390) is provided for cancelling user code noise from a spread-spectrum communication channel. The spread-spectrum noise canceller (390) includes a receiver for receiving... |
| 5235615 |
Spread spectrum method |
| Aug-10-1993 |
A method for establishing and communicating synchronous, code division multiple access communications between a base station and a plurality of remote units. A plurality of remote-communications signals... |
| 5235614 |
Method and apparatus for accommodating a variable number of communication channels in a spread spectrum communication system |
| Aug-10-1993 |
A method and apparatus is provided for transmitting spread spectrum signals. The transmitter receives data symbols. Subsequently, the transmitter splits each particular set of two received data symbols... |
| 5235616 |
Bidirectional data transmission system |
| Aug-10-1993 |
A bidirectional data transmission system using the technique known as spectrum spreading by direct sequence comprises a first transmitter-receiver assembly consisting of a first transmitter section which... |
| 5233626 |
Repeater diversity spread spectrum communication system |
| Aug-3-1993 |
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... |
| 5228056 |
Synchronous spread-spectrum communications system and method |
| Jul-13-1993 |
A spread spectrum communications system for use over a communications channel, including a transmitter-generic-chip-code generator, a transmitter-message-chip-code generator, an EXCLUSIVE-OR gate, a combiner,... |
| 5226081 |
Multi-carrier communication system using ciphered carrier bit assignment information |
| Jul-6-1993 |
A multi-carrier communication system wherein a sender side apparatus and a receiver side apparatus are connected through a transmission line. The sender side apparatus contains a multi-carrier modulator... |
| 5224121 |
Rolling synthesizer method for baseband slow frequency hopping |
| Jun-29-1993 |
A method and apparatus is offered of exchanging a communicated signal at a base site with a communication unit on an indexed frequency of a frequency hopping communication system. The method includes the... |
| 5222098 |
Spectrum spread communication system |
| Jun-22-1993 |
A spectrum spread communication system capable of ensuring positive synchronization and improving error rate characteristics of data. At least one frequency is subject to hopping at an interval equal to... |
| 5222075 |
Transmitted code clock code-matching synchronization for spread-spectrum communication systems |
| Jun-22-1993 |
The transmitter for a direct-sequence spread-spectrum communication system encodes its code rate into the phase difference between a pair of identically modulated, sum and difference frequency carries... |
| 5220580 |
Remote-control system with a spread-spectrum transmission link |
| Jun-15-1993 |
A remote-control system with position control includes a spread-spectrum where at least three independent spread-spectrum signals are transmitted. At the receiving end, these signals are separated into... |
| 5218639 |
Method and apparatus for changing bit rate of digitized analog |
| Jun-8-1993 |
Method and apparatus for changing the bit rate of a digitized analog signal stream from a first bit rate to a second bit rate. A first sequence generator provides a digital predictor sequence clocked at... |
| 5218618 |
Cellular telephone service using spread spectrum transmission |
| Jun-8-1993 |
A spread spectrum processing system that employs wide bandwidth spread spectrum radio transmissions overlaid over the existing cellular voice signals to simultaneously provide additional cellular services... |
| 5216693 |
Spread spectrum communications system |
| Jun-1-1993 |
A spread spectrum communications system in which one of a transmitter or a receiver uses a PN code sequence while another side uses a code sequence to which is used constant pattern signals comprising... |
| 5216691 |
Digital receiver for spread-spectrum signals |
| Jun-1-1993 |
The receiver contains a correlator (TIC) for the correlation of the received signal with a reference code (R(k)) and a digital signal processor for evaluating the results of the correlation. The correlator... |
| 5210772 |
Approximate figures measuring system |
| May-11-1993 |
An approximate figures measuring system includes a signal transmission device and a signal receiving device. The signal transmission device is arranged in each of any objects to be measured and emits a... |
| 5208830 |
Process for searching for synchronization on reception of a spread spectrum modulated signal |
| May-4-1993 |
In a phase demodulator is received a signal of which the carrier is phase-modulated by a digital pseudorandom sequence itself phase-modulated by a data signal. A frequency close to that of the carrier... |
| 5208829 |
Communication satellite system having an increased power output density per unit of bandwidth |
| May-4-1993 |
A satellite communication system for providing maximum power output in a spread spectrum signal transmission is disclosed. Spectral shaping is provided at a satellite transmitter to shape a spread spectrum... |
