Patent
Adaptive spread spectrum FH-MFSK transmitter and receiver
Reads0
Chats0
TLDR
In this article, a transmitter, a receiver and techniques for use in a frequency-hopping, multilevel frequency shift keyed (FH-MFSK) radio system are described.Abstract:
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 time slot of the transmitted sequence for improving reception at a receiver experiencing interference from the system transmitters above a predetermined interference threshold level. An alternative arrangement permits all transmitters and receivers to communicate with one another by transmitting a separate one of multiple frequencies in a separate one of an equal number of multiple frequency subbands forming the system frequency band during each time slot for providing flexibility in system design. Combinations of the two arrangements can also be employed.read more
Citations
More filters
Patent
Multi-band, multi-mode spread-spectrum communication system
TL;DR: In this article, a technique for spread-spectrum communication which uses more than one mode and multiple frequency bands is presented. But the frequency band onto which spread-Spectrum signals are encoded may be changed upon a change in environment or other control trigger, such as establishment or de-establishment of communication with a private access network.
Patent
Spread-spectrum identification signal for communications systems
TL;DR: In this article, a spread-spectrum signal which conveys identifying information for an associated information signal is superimposed on the associated signal and transmitted therewith, which can be used for a variety of purposes within a communications network, such as facility and equipment selection, equipment disablement and bypass, setting communications parameters, and inhibiting communications upon fault detection.
Patent
Digital communication system using superposed transmission of high speed and low speed digital signals
TL;DR: In this paper, a digital communication system using superposed transmission of high and low speed digital signals capable of transmitting superposed high-and low-speed digital signals through an identical frequency band was proposed.
Patent
Digital radio transmission system for a cellular network using the spread spectrum technique
TL;DR: In this article, the authors considered the problem of multichannel digital data transmission in buildings and local areas for the configuration of a so-called cordless LAN, where a base station (BS) and mobile user stations (MS) each with a transmitter (S), a receiver (E) for multipath reception and a control unit (ST) are provided in each cell.
Patent
Remotely-operated self-contained electronic lock security system assembly
Demos Andreou,Ari Glezer +1 more
TL;DR: In this paper, a keyless locking mechanism is activated by a remote unit which transmits coded signals to an electromechanical door lock device, which acts solely along the locking axis to enable or disable the door locking assembly.
References
More filters
Journal ArticleDOI
A spread-spectrum technique for high-capacity mobile communications
George R. Cooper,R.W. Nettleton +1 more
TL;DR: The spectral efficiency of the spread-spectrum scheme may exceed those of the narrow-band schemes by a factor of almost five, and more ambitious bit-rate-reducing speech digitization methods could improve still further on these figures.
Journal ArticleDOI
Frequency-hopped multilevel FSK for mobile Radio
TL;DR: A multiple-access modulation technique that uses multilevel frequency shift keying (FSK) to modulate frequency-hopped, spread-spectrum carriers is examined for possible application to digital mobile radiotelephony.
Patent
Frequency hopping communication system
Gerald Rabow,Alvin E. Nashman +1 more
TL;DR: In this article, a signal modulated with information is hopped to discrete frequencies and its phase is selected to be 0° or 180° in each frequency hop interval under control of a pseudo-noise binary code signal produced by a code generator.
Patent
Spread spectrum FH-MFSK radio receiver
TL;DR: In this article, 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 particular user is presented.