Patent
Method for the simultaneous transmission of a plurality of data stream over one transmission channel
TLDR
In this paper, a method for simultaneously transmitting a plurality of data streams over one transmission channel with the aid of modems is proposed, where in order to synchronize the receiver for the purpose of device-specific modulation, a small additional modulation is applied in the transmitter, with the frequency of the additional modulation being equal to the transmitter modulation rate divided by a whole number, and the added modulation is demodulated in the receiver by multiplying the associated values obtained from the scanning clock pulse by the difference between the associated and actual values received.Abstract:
A method for simultaneously transmitting a plurality of data streams over one transmission channel with the aid of modems, wherein in order to synchronize the receiver for the purpose of device-specific modulation, a small additional modulation is applied in the transmitter, with the frequency of the additional modulation being equal to the transmitter modulation rate divided by a whole number, and the additional modulation is demodulated in the receiver by multiplying the associated values obtained from the scanning clock pulse by the difference between the associated and actual values received, and the resulting parameter is freed of interference with the aid of a band pass filter or a phase control loop.read more
Citations
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Spectrally efficient digital modulation method and apparatus
TL;DR: In this article, a uniquely shaped prototype digital pulse which is transmitted with minimal frequency spectrum consumption and yet a relatively high bit rate is presented. Butler et al. presented a method and apparatus for generating a uniquelyshaped prototype digital signal.
References
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Patent
Phase-difference-modulation communication system
TL;DR: In this paper, a frame synchronization technique for a phase-difference modulation communication system was proposed, in which a carrier wave is modulated in accordance with information signals emanating from a plurality of information channels and subsequently time-division multiplexed into a series of time frames.
Patent
Time division digital multiplexer apparatus
TL;DR: In this paper, a synchronous time division digital multiplexer is used to transmit data from a plurality of parallel input channels that are sequentially sampled and converted to serial data having non-return to zero (NRZ) characteristics.