Patent
Method of and apparatus for modulation of FSK carrier in a very narrow band
Serge Mathieu,Dominic Tremblay +1 more
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TLDR
In this article, a method and a transmitter system for modulating binary information on a frequency shift keying carrier in a very narrow band was provided, where phase reversal keying was initially used to create a carrier.Abstract:
A method and a transmitter system is provided for modulating binary information on a frequency shift keying carrier in a very narrow band. Phase reversal keying is initially used to create a carrier. The transmitter of the present invention generates a carrier signal by modulating a reference signal and a control signal having two frequencies representing the binary data to be transmitted. The resulting phase reversal carrier signal is processed by high order filtering such that the output of the transmitter provides a frequency shift keyed carrier at very close frequencies. The resulting carrier signal may, at the receiver, be processed by very narrow band filtering so as to create a communication system which will use only a small part of the available spectrum.read more
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Digital modulation device in a system and method of using the same
TL;DR: In this paper, a wireless digital transmission and receiving method combines phase reversal keying with pulse position modulation (PQP) to synthesize a sideband with no carrier or other sidebands from the carrier of an input signal, represented by a broad sinx/x spectrum with a principal power peak at the modulated frequency and numerous weaker peaks of varying frequencies and peak levels.
Patent
Transmitter tolerant to crystal variations
TL;DR: In this paper, a transmitter (800) to transmit data from an end-point includes a reference oscillator (802), a low pass filter (804) coupled to the reference oscillators (802); a modulation filter(804) to provide an over-sampled modulated signal; a synthesizer (808) coupled with the low pass filters (804 and the modulation filter (806); and a sine wave generator (812) coupling to the synthesizer(808).
Patent
Power systems and methods using voltage waveform signaling
TL;DR: In this paper, a status of a power source is signaled by controlling a waveform of an AC voltage generated from the power source, which is then used to signal the status of the source.
Patent
System and method for power line communication
Steve Baril,Charles Labarre +1 more
TL;DR: In this article, a power line communication system is described, where the time axis is divided into a number of time slots synchronized such that one time slot can start about a zero crossing of the power line signal.
Patent
Apparatus for receiving and recovering frequency shift keyed symbols
TL;DR: In this article, a receiver architecture includes a selectivity filter (206) for selectively passing a wanted channel and rejecting unwanted channels, which has a filter BT of about one-half the BT of the transmitter filter.
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Patent
Packet data communication system
Laroy Tymes,John W. Kramer +1 more
TL;DR: In this article, a packet data transmission system is used to link a number of remote hand-held data-gathering units such as bar code readers to a central computer which maintains a database management system.
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Signal quality measure in packet data communication
TL;DR: In this article, a packet data transmission system is used to link a number of remote hand-held data-gathering units such as bar code readers to a central compuer which maintains a database management system.
Patent
Method of, and apparatus for, information communication via a power line conductor
TL;DR: In this article, the PLC signal is received by a receiver connected to a system conductor at a location different from the location of the transmitter, and the transmitted information is recovered therefrom.
Patent
Power line communication system utilizing a local oscillator
TL;DR: In this paper, a power line transmission system which generates a narrow band multi-frequency shift keyed signal having a first predetermined frequency representing a first state of information (e.g., a "0") and a second fixed frequency representing the second state of the information (i.e. a "1").
Patent
Method of and arrangement for transmitting messages in a digital radio transmission system
TL;DR: In this paper, a method and apparatus for use in a digital radio transmission system comprising stationary radio stations arranged in a cellular network and to which are assigned a plurality of mobile radio stations is presented.