| 5452356 |
Paging transmission system |
| Sep-19-1995 |
Method and apparatus for sending, receiving, and displaying custom coded textual and/or graphic data via an alphanumeric paging system wherein source data in binary form is encrypted with a designated... |
| 5450453 |
Method, apparatus and system for decoding a non-coherently demodulated signal |
| Sep-12-1995 |
Non-coherently demodulated signals are efficiently decoded using a non-complex system that is independent of the fading statistics of the channel. A symbol metric calculator (406) receives a signal-to-noise... |
| 5448600 |
Method for selecting propagation paths retained for receiving messages transmitted by CDMA radiocommunication |
| Sep-5-1995 |
Each path is identified by a delay which is applied to at least one spreading sequence for determining a correlation between the received signal ans said spreading sequence. For each selected delay, a... |
| 5448599 |
Method and arrangement for radiocommunication using a band-spreading technique |
| Sep-5-1995 |
The invention relates to a method and an arrangement for radiocommunication between a transmitter and a receiver, especially transmission of information between mobile units and/or fixed units in connection... |
| 5442662 |
Code-division multiple-access communication system providing enhanced capacity within limited bandwidth |
| Aug-15-1995 |
A code-division multiple-access spread-spectrum communication system uses pairs of spreading codes with rates of N/2 chips per data symbol to provide a capacity equivalent to that obtained in a conventional... |
| 5442659 |
Radio communications system with fault tolerant frequency hopping synchronization |
| Aug-15-1995 |
A method for use in multicellular communication network system of the type having base stations and a plurality of remote stations. The method achieves reliable and fault tolerant synchronization between... |
| 5442660 |
Frequency hopping sequence using galois field |
| Aug-15-1995 |
Frequency hopping enables a plurality of channels to share the same bandwidth without interference. The present invention utilizes Galois Field theory to define frequency hopping sequences for a plurality... |
| 5440636 |
Apparatus and method for processing of frequency hopping communications |
| Aug-8-1995 |
The present invention relates to signal processors and processing, and more particularly to apparatus and method for sensing, detection and/or demodulation of frequency hopping signals. |
| 5438596 |
Method and apparatus for generating diffusion code |
| Aug-1-1995 |
A method and apparatus for generating the PN code employed for spread spectrum communication are disclosed. Maximal period sequence signals from a maximal period sequence generator 11 and shift vector... |
| 5438589 |
Spread spectrum communication system |
| Aug-1-1995 |
A spread spectrum communication system includes a transmitter and a receiver responsive to a signal transmitted by the transmitter, the transmitter including: a pseudonoise signal generator for generating... |
| 5436973 |
Pseudo-random signal synthesizer with smooth, flat power spectrum |
| Jul-25-1995 |
Apparatus and a method are disclosed for synthesizing a pseudorandom communications signal having a smooth, flat, power spectrum. The system comprises frequency modulation circuitry for deriving a first... |
| 5432815 |
Data modulator-demodulator apparatus of a spread spectrum communication system |
| Jul-11-1995 |
In performing data communication between a subscriber terminal and a scanner of a remote information processing system, there is provided a data modulator-demodulator apparatus of a pseudo noise spread... |
| 5432814 |
Spread spectrum communication system |
| Jul-11-1995 |
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... |
| 5432813 |
Parallel processing based digital matched filter and error detector for a digital demodulator |
| Jul-11-1995 |
A high chipping rate digital demodulator circuit is coupled to the output of an analog front end communications receiver and comprises a low pass filter in each channel of the receiver. The filtered output... |
| 5430799 |
Multichannel television signal scrambling and descrambling system and method |
| Jul-4-1995 |
A multichannel television access control system is disclosed wherein processing of the broadband signal is performed by gated coherent RF injection on a plurality of channels, thereby effecting selective... |
| 5430775 |
Method and apparatus for a radio communication system |
| Jul-4-1995 |
A radio communication system (10) operates over a sequence of communication channels using a synchronized channel hopping protocol. A first communication device (16) is provided which is capable of communicating... |
| 5430761 |
Reduced interference through offset frequency partitioning |
| Jul-4-1995 |
A method of reducing interference within a cellular system (10) by partitioning a designated frequency spectrum within a service coverage area (.0.1, .0.2, or .0.3) into a first and at least second spectrum... |
| 5428637 |
Method for reducing synchronizing overhead of frequency hopping communications systems |
| Jun-27-1995 |
A method for reducing the synchronization overhead in Frequency Hopping communication systems. Generally, the method establishes a synchronization state during which a plurality of communications can take... |
| 5426666 |
Communication apparatus |
| Jun-20-1995 |
There is disclosed a wireless communication apparatus for constituting a multi-station communication system, capable of preventing the interference to other communications and the deterioration in the... |
| 5426665 |
Signal compression systems |
| Jun-20-1995 |
A signal compression system a receiver comprising, a down frequency converter to which received compressed signals are fed thereby to provide compressed baseband signals and an m-bit digital correlator... |
| 5425060 |
Mechanism for reducing timing jitter in clock recovery scheme for blind acquisition of full duplex signals |
| Jun-13-1995 |
Timing jitter in the clock recovery loop of a `blind` signal acquisition receiver employing a square law detector in a phase lock loop signal flow path is substantially reduced by adaptively adjusting... |
| 5425049 |
Staggered frequency hopping cellular radio system |
| Jun-13-1995 |
A communication system having a frequency hopping scheme which provides increased interferer diversity without increased system delay is disclosed. The frequency hopping scheme includes providing a staggered... |
| 5422952 |
Dynamic radio communications system |
| Jun-6-1995 |
A communication system includes a plurality of subscribers each of said subscribers having a transceiver including a transmitter and a receiver. In the system there are means coupled to each of said transceivers... |
| 5422919 |
EMI suppression coding |
| Jun-6-1995 |
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 MLT-3 data format. By pseudorandomizing... |
| 5422908 |
Phased array spread spectrum system and method |
| Jun-6-1995 |
A phased array spread spectrum system for maximizing signal strength of a spread-spectrum signal with multipath. A received spread-spectrum signal is delayed with respect to a phased version of the spread-spectrum... |
| 5420896 |
Synchronous spread-spectrum communications system and method |
| May-30-1995 |
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,... |
| 5418812 |
Radio network initialization method and apparatus |
| May-23-1995 |
A packet data transmission system is disclosed in which remote units, such as remote hand-held data gathering units, which normally communicate with remote base stations via a spread spectrum RF communications,... |
| 5418813 |
Method and apparatus for creating a composite waveform |
| May-23-1995 |
A method and apparatus is provided for creating a composite waveform. This composite waveform is created by coding a plurality of input digital information signals. Subsequently, the plurality of coded... |
| 5418814 |
Threshold cancellation means for use in digital mobile radio networks |
| May-23-1995 |
In a direct sequence spread spectrum code division multiple access receiver using interference cancellation, the signal for cancellation is derived by demodulating the unwanted signals and re-modulating... |
| 5416797 |
System and method for generating signal waveforms in a CDMA cellular telephone system |
| May-16-1995 |
A system and method for communicating information signals using spread spectrum communication techniques. PN sequences are constructed that provide orthogonality between the users so that mutual interference... |
| 5414731 |
Command set and procedure for synchronization of frequency hopping control clocks |
| May-9-1995 |
A wireless Local Area Network (LAN), in which each wireless adapter includes a controller and a transceiver which are located a finite distance from each other. Each controller and transceiver has their... |
| 5414728 |
Method and apparatus for bifurcating signal transmission over in-phase and quadrature phase spread spectrum communication channels |
| May-9-1995 |
An improved system and method for communicating information over in-phase (I) and quadrature phase (Q) communication channels in a spread spectrum communication system is disclosed herein. In an exemplary... |
| 5414729 |
Pseudorandom noise ranging receiver which compensates for multipath distortion by making use of multiple correlator time delay spacing |
| May-9-1995 |
A receiver for pseudorandom noise (PRN) encoded signals consisting of a sampling circuit, multiple carrier and code synchronizing circuits, and multiple digital correlators. The sampling circuit provides... |
| 5414730 |
Asynchronous samples data demodulation system |
| May-9-1995 |
A novel PN code acquisition and demodulation circuit comprise an analog receiver coupled to an analog to digital converter. The digital output of the converter is passed through an N chip width parallel... |
| 5412687 |
Digital communications equipment using differential quaternary frequency shift keying |
| May-2-1995 |
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... |
| 5408496 |
Spread-spectrum, frequency-hopping radiotelephone system |
| Apr-18-1995 |
A multiple access communications system reuses a set of N carrier frequencies in adjacent communications sites to provide more than N minimally cross-correlated frequency-hopping communications channels.... |
| 5406629 |
Apparatus and method for digitally processing signals in a radio frequency communication system |
| Apr-11-1995 |
A plurality of input signals are processed (75) using a Hadamard transform (52) to produce a combined Walsh covered parallel sequence which is sampled in time. The time samples are commutated (76) by a... |
| 5404377 |
Simultaneous transmission of data and audio signals by means of perceptual coding |
| Apr-4-1995 |
A communication system for simultaneously transmitting data and audio signals via a conventional audio communications channel using perceptual coding techniques is disclosed. In a preferred embodiment,... |
| 5404375 |
Process and apparatus for satellite data communication |
| Apr-4-1995 |
A system for transmitting and receiving outbound and inbound data signals through a satellite communications network, the system having a network data rate and including a satellite and an end user transceiver,... |
| 5402442 |
Receiving device for receiving and demodulating spread spectrum-modulated GPS wave |
| Mar-28-1995 |
A receiving device for receiving spread spectrum-modulated GPS signal transmitted from GPS (Global Positioning System) satellites to the earth. Received GPS signals are converted into IF signals which... |
| 5396515 |
Asymmetric spread spectrum correlator |
| Mar-7-1995 |
An apparatus for decoding a received spread spectrum signal having a data signal modulated with a pseudo-noise code and transmitted as an RF spread spectrum signal. A reference-sequence-storage device... |
| 5394434 |
Code-division multiple-access demodulator with improved interference cancelation |
| Feb-28-1995 |
A demodulator for code-division multiple-access spread-spectrum communications stores received chip data in a separate memory area for each transmitting station. Each area has a capacity of at least two... |
| 5383220 |
Data demodulator of a receiving apparatus for spread spectrum communication |
| Jan-17-1995 |
A data demodulator of a receiving apparatus for spread spectrum communication for removing the phase difference remaining after detection for improving reception quality. In-phase and quadrature axis received... |
| 5383219 |
Fast forward link power control in a code division multiple access system |
| Jan-17-1995 |
The power control process of the present invention enables a mobile radiotelephone to continuously update the base station on the power output required. The base station sends a frame to the mobile at... |
| 5381481 |
Method and apparatus for uniquely encrypting a plurality of services at a transmission site |
| Jan-10-1995 |
Methods and apparatus are described for uniquely encrypting a plurality services at a transmission site and for decrypting selected services at a reception site while reducing the amount of encryption... |
| 5381445 |
Munitions cartridge transmitter |
| Jan-10-1995 |
A munitions cartridge transmitter capable of emitting an electromagnetic signal after discharge from a cartridge propelling device comprises a signal generator, an electromagnetic signal transmitter coupled... |
| 5381444 |
Radio environment measuring system |
| Jan-10-1995 |
A radio environment measuring system for measuring a propagation state of radio waves includes: a fixed radio apparatus provided in a base station; a mobile radio apparatus operatively connected to the... |
| 5381443 |
Method and apparatus for frequency hopping a signalling channel in a communication system |
| Jan-10-1995 |
A cellular communication system hops both signalling channels and traffics channels in a common hopping sequence. To obtain system information from the frequency hopping signalling channel, a subscriber... |
| 5379345 |
Method and apparatus for the processing of encoded data in conjunction with an audio broadcast |
| Jan-3-1995 |
A method and apparatus for the identification and verification of audio transmission segments, such as may be broadcast by a radio station, consists of the generation of a data stream corresponding in... |
| 5377222 |
Frequency agile radio |
| Dec-27-1994 |
A frequency agile spread spectrum radio system which uses a frequency-agile receiver that adaptively learns which frequencies to avoid as being occupied or jammed. The transmitter sends redundant transmissions... |
