Patent
Digital radio transmission system for transmitting a plurality of information signals by a network of transmitters having substantially the same carrier frequencies
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TLDR
In this paper, three types of transmitters which have three carriers whose deviation is very small compared with the band with of a channel are used in the transmitter network to control the problem of fading.Abstract:
In this system in which the information signals to be transmitted are converted into the digital form, transmission is done via a frequency-division multiplexer which so transmit the bits of the information signals in parallel that the duration of the bits transmitted through the channels of the multiplexer is longer than double the difference in propagation time between two carriers obtained from the two transmitters which are nearest in the receiving zone, where the said carriers have levels which are near to one another. This solves the problem of overlap between the information signals. To control the problem of fading, three types of transmitters which have three carriers whose deviation is very small compared with the bandwith of a channel are used in the transmitter network.read more
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References
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Patent
Digital transmission system for transmitting speech signals at a low bit rate, and transmission for use in such a system
Bijker A J,Riemens K +1 more
TL;DR: In this article, a uniform delta modulator is provided with an input circuit which changes the shape of the speech signal so that the input signal to the delta modulators has a constant slope.
Patent
Time division multiplex transmission system
Denroku Kumagai,Yutaka Kurahashi +1 more
TL;DR: In this paper, a repeater station for combining and dropping groups or portions of groups of PCM signals in a multi-channel time division multiplex transmission system provides circuitry for generating timing control signals from groups of the multiplex signals to delay and/or inhibit select portions of selected information groups to either combine or drop selected information therein from the transmitted signal groups.