| 5546464 |
Method of and apparatus for selective resynchronization in a digital cellular communications system |
| Aug-13-1996 |
In a ciphered digital cellular communications system a method and apparatus are presented for selective resynchronization of the cipher upon initial channel acquisition or handoff. Where synchronization... |
| 5546424 |
Spread spectrum communication system |
| Aug-13-1996 |
A spreading process is performed with a spreading code assigned to each user and a spreading code assigned according to an attribute, and the resultant signal is modulated on the transmitter side. On the... |
| 5544196 |
Apparatus and method for reducing message collision between mobile stations simultaneously accessing a base station in a CDMA cellular communications system |
| Aug-6-1996 |
Collisions between messages simultaneously transmitted by multiple spread-spectrum transmitters are reduced by distributing the transmissions over the available resources of the receiver. The transmitters... |
| 5539769 |
Adaptive fuzzy frequency hopping system |
| Jul-23-1996 |
A system and method for fuzzy spread spectrum communication. The system includes a fuzzy spreader for spreading an input signal over a range of frequencies and fuzzy despreader for extracting the spread... |
| 5535239 |
Data burst randomizer |
| Jul-9-1996 |
A method and system, for use in a communication system in which data is transmitted in data frames of a predetermined time duration, for the positioning of the data within the data frames for transmission.... |
| 5535237 |
Method and system for a multi channel and search global position system signal processor |
| Jul-9-1996 |
There is disclosed a multi channel GPS digital signal processor on a single IC. Each channel contains circuitry to process L1 or L2 P(Y) and C/A-code signals. In addition a search processor is included... |
| 5533046 |
Spread spectrum communication system |
| Jul-2-1996 |
In a one embodiment of a spread spectrum communication system, an unmodulated synchronization wavetrain and one or more modulated intelligence wavetrains are generated in timed relation and are concurrently... |
| 5528622 |
Communication system having channel hopping protocol and multiple entry points |
| Jun-18-1996 |
A communication system (100) operates on a system acquistion channel, and a set of communication channels organized into a sequence (200) which includes a set of reservation channels (202, 204) selected... |
| 5526389 |
Spread spectrum open loop data recovery processor |
| Jun-11-1996 |
A spread spectrum open loop data recovery processor receives a single information channel bi-phase modulated RF signal and combines it with a locally generated fixed frequency signal having an accuracy... |
| 5521937 |
Multicarrier direct sequence spread system and method |
| May-28-1996 |
A multicarrier direct sequence spread spectrum system and method. A maximal combiner is employed at the receiver for maximizing signal-to-noise ratio out of the receiver. The multicarrier system provides... |
| 5521938 |
Apparatus for performing frequency conversion in a communication system |
| May-28-1996 |
An efficient apparatus for performing frequency conversion from a final IF frequency to a baseband frequency is described. A counter (401) generates two logical signals G1 (402) and G2 (403) which are... |
| 5519779 |
Method and apparatus for inserting signaling in a communication system |
| May-21-1996 |
Signaling is inserted (102) into a communication channel of a communication system by inserting the signaling into the communication channel if the communication channel has sufficient available bandwidth... |
| 5517518 |
Method and arrangement for recognition of a coded transmitted signal |
| May-14-1996 |
The present invention is for fast, reliable recognition of coded signals where the signal includes a predetermined code sequence in a lead portion thereof. This has particular application in spread spectrum... |
| 5515396 |
Method and apparatus for selecting a spreading code in a spectrum spread communication system |
| May-7-1996 |
A communication system utilizes multiple spreading codes to transmit high data rate information. The system codes high data rate user information (201) and partitions the coded information (202) into blocks... |
| 5515395 |
Coding method, coder and decoder for digital signal, and recording medium for coded information information signal |
| May-7-1996 |
In quantizing a digital signal in respective frequency bands by quantization units and transmitting (transmitting or recording) such quantized digital signal, second quantization accuracy information indicating... |
| 5513210 |
Method for controlling channel access priorities in a frequency hopping local area network |
| Apr-30-1996 |
A method for prioritizing data transmissions in a frequency hopping communication system (10) includes defining a predetermined number of time slots at the beginning of a dwell or end of a transmission,... |
| 5511090 |
Wireless frequency-division-multiple-access direct sequence spread spectrum telephone system |
| Apr-23-1996 |
A cordless, battery-operated telephone of relatively low power consumption suitable to operate in license-exempt spectrum and which may employ an established communication protocol, such as the CT-2 communication... |
| 5506863 |
Method and apparatus for operating with a hopping control channel in a communication system |
| Apr-9-1996 |
A communication unit for use in a communication system is provided which includes a hopping mechanism which hops communication frames over a plurality of carrier frequencies according to a predetermined... |
| 5506861 |
System and method for joint demodulation of CDMA signals |
| Apr-9-1996 |
Methods and systems for jointly demodulating CDMA signals are presented. The disclosed methods and systems provide, among other advantages, for accurate demodulation of such signals in multipath, time-dispersion... |
| 5504773 |
Method and apparatus for the formatting of data for transmission |
| Apr-2-1996 |
In a digital communication system in which digital data is transmitted in data frames of a preselected time duration, a method and apparatus for formatting digital data in each data frame. A set of data... |
| 5500872 |
Spread spectrum base band processor |
| Mar-19-1996 |
An apparatus including an antenna and amplifier for receiving and amplifying a spread spectrum signal, at least two correlators for determining the correlation levels of the received signal with respect... |
| 5499265 |
Spread spectrum correlator |
| Mar-12-1996 |
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 first reference register holds a first... |
| 5499267 |
Spread spectrum communication system |
| Mar-12-1996 |
A spread spectrum communication system includes a receiving section which receives a signal produced by modulating a carrier of a predetermined frequency with a spread spectrum signal which has been modulated... |
| 5497424 |
Spread spectrum wireless telephone system |
| Mar-5-1996 |
A system for accessing a telephone system, in which a set of user stations are matched with a set of base stations for connection to a telephone network. Each base station may be coupled directly or indirectly... |
| 5497395 |
Method and apparatus for modulating signal waveforms in a CDMA communication system |
| Mar-5-1996 |
An improved system and method for transmitting information within a digital communication system is disclosed herein. A modulation system for use in a digital cellular communication system is described... |
| 5493612 |
Secure communication keying system |
| Feb-20-1996 |
The secure communication keying system has a noise generator whose output a predetermined finite band of noise within, for example, the zero to eleven hundred cycle per second range. The noise generator... |
| 5491717 |
Method for controlling transmission during handoff in a communication system |
| Feb-13-1996 |
Transmission is controlled using the present method after a handoff procedure has been entered between a subscriber unit and target transceivers. During this process, a communication link between the subscriber... |
| 5488662 |
System and method for identifying an arrival time of a communicated signal |
| Jan-30-1996 |
A transmitter (12) broadcasts a PN encoded message (16). A receiver (14) includes a SAW correlator (38) configured to autocorrelate with the PN sequence used in the broadcast signal. A preamble of the... |
| 5488631 |
Wireless direct-sequence spread spectrum TDMA communications system |
| Jan-30-1996 |
A protocol for wireless direct user-to-user DSSS TDMA digital communication at a data rate of the order of one to several megabits per second in the 902-928 MHz, 2400-2483.5 MHz or 5725-5850 MHz band includes... |
| 5488630 |
System for acquiring and compressing pulse trains |
| Jan-30-1996 |
The present invention relates to receiver systems for receiving trains of pulses transmitted by satellites. The receiver system is characterized by the fact that it includes receiver means (100) for receiving... |
| 5488627 |
Spread spectrum clock generator and associated method |
| Jan-30-1996 |
A clock circuit includes an oscillator for generating a reference frequency signal, and a spread spectrum clock generator cooperating with the oscillator for generating a spread spectrum clock output signal... |
| 5485486 |
Method and apparatus for controlling transmission power in a CDMA cellular mobile telephone system |
| Jan-16-1996 |
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... |
| 5483549 |
Receiver having for charge-coupled-device based receiver signal processing |
| Jan-9-1996 |
This invention relates to a novel receiver architecture, the Charge-Coupled-Device Integrated Receiver (IR), which simplifies electronic circuitry requirements and reduce baseband processing rates through... |
| 5481561 |
Fully meshed CDMA network for personal communications terminals |
| Jan-2-1996 |
A network of personal communications terminals communicating in a CDMA mode includes a reference station for transmitting a pilot tone that is pre-corrected at the reference station and is used at the... |
| 5479442 |
Spectrum spread receiver and spectrum spread transmitter-receiver including same |
| Dec-26-1995 |
A spectrum spreading receiver including a super-regenerative demodulator which is capable of receiving a spectrum spread signal and which is resistant to noise and has a wide band, resulting in being simplified... |
| 5475707 |
Broadband communications system |
| Dec-12-1995 |
A signal of bandwidth F.sub.max is unambiguously transmitted over a datalink having a bandwidth less than F.sub.max by subdividing the signal into a plurality of subspectrums and bandshifting the subspectrums... |
| 5473631 |
Simultaneous transmission of data and audio signals by means of perceptual coding |
| Dec-5-1995 |
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,... |
| 5469471 |
Method and apparatus for providing a communication link quality indication |
| Nov-21-1995 |
A link quality improvement system for a cellular communication system in which portable units are used to facilitate communication of information signals between system users, via at least one cell-site,... |
| 5469470 |
Spread spectrum communication system using two-predetermined-code pseudo-noise signals |
| Nov-21-1995 |
A transmission terminal modulates, for a first state of given data signal, a non-return-to-zero code pseudo-noise signal onto a carrier band. Further, the terminal modulates, for a second state of the... |
| 5469468 |
Overlaying spread-spectrum satellite system and method |
| Nov-21-1995 |
A spread-spectrum satellite system for communicating data and paging messages to a plurality of remote units. The spread-spectrum communications system has a satellite with an antenna beamwidth located... |
| 5467367 |
Spread spectrum communication apparatus and telephone exchange system |
| Nov-14-1995 |
A telephone exchange system of this invention has a terminal connected to an extension by radio. As a radio communication modulation method, a spread spectrum method is used. A speech signal received from... |
| 5467368 |
Spread spectrum signal demodulator |
| Nov-14-1995 |
A demodulator receiving as input signal a sum of a plurality of spread spectrum signals is disclosed. The demodulator comprises means for obtaining a correlation between a spreading code assigned to each... |
| 5465269 |
Method and apparatus for encoding and decoding a supplementary signal |
| Nov-7-1995 |
A differential coherent modulation and demodulation method and apparatus non-coherently modulates (201) a data stream to generate non-coherently modulated data. The non-coherently modulated data is phase... |
| 5463657 |
Detection of a multi-sequence spread spectrum signal |
| Oct-31-1995 |
A detector of a multiple-sequence spread spectrum signal uses a Hadamard transform (106) to simultaneously correlate a received signal comprising two sequences (64) with a plurality of candidate sequences.... |
| 5461639 |
Fast forward link power control in a code division multiple access system |
| Oct-24-1995 |
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... |
| 5459760 |
Transmitting and receiving apparatus |
| Oct-17-1995 |
In a transmitting and receiving apparatus for transmission and reception of signals based on the frequency hopping spread spectrum scheme, hopping patterns used for a transmitter and a receiver are respectively... |
| 5459759 |
Frequency hopping code division multiple access system and method |
| Oct-17-1995 |
A frequency-hopping-communications system, assigned a system bandwidth B, with the system bandwidth B divided into N sets of frequencies, with each set of the N sets of frequencies not having the same... |
| 5457713 |
Spread spectrum alignment repositioning method |
| Oct-10-1995 |
A method for maintaining spread spectrum chip sequence synchronization, over arbitrary time periods, without the use of traditional closed loop strategies. The technique can be accomplished entirely in... |
| 5455863 |
Method and apparatus for efficient real-time authentication and encryption in a communication system |
| Oct-3-1995 |
Radio frequency based cellular telecommunication systems often require both subscriber units and communication units of a fixed network communication system to maintain secret data which may be used to... |
| 5454010 |
System and method for calibration of frequency hopping |
| Sep-26-1995 |
A system and method for calibrating telecommunications systems employs frequency hopping techniques, and more particularly, employs linked compressor-expander (Lincompex) techniques in the transmission... |
