Multichannel time division multiplexed trunk transmission link
First Claim
Patent Images
1. A multichannel time division multiplexed communications system including a transmitting end and a receiving end, comprising in combination;
- means located at the transmitting end of said system for generating a time division multiplexed bit stream of a plurality of communications channels in respective time slots of a time frame period;
channel selector control means for selecting a predetermined number of channels less than said plurality of communications channels to be transmitted to the receiving end of said system;
means coupled to said bit stream generating means and being controlled by said channel selector control means for providing as an output said predetermined number of channels as respective bits of said bit stream in each said frame period;
means responsive to each bit of said bit stream for generating a pair of coded signals which upon receipt and detection produces an impulse autocorrelation function signal;
means for multiplexing said coded signals and transmitting multiplexed signals to said receiving end;
means located at said receiving end for demultiplexing said multiplexed signals whereby said pair of coded signals are again provided;
code detector means coupled to said pair of coded signals for producing first and second impulse autocorrelation function signals; and
means for adding said first and second autocorrelation function signals to provide respective lobeless impulse output signals of said selected channels.
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Abstract
A multichannel time division multiplexed (TDM) bit stream has specific channels selected by gating selected channel bits out of a composite group of channels. The selected channel bits are spread spectrum coded as multiplexed noise codes which are then used to modulate a transmitter for communicating the codes over a transmission link. The noise codes are then automatically compressed back to original channel bits at a receiver to provide output signals which are totally non-interfering with each other.
40 Citations
9 Claims
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1. A multichannel time division multiplexed communications system including a transmitting end and a receiving end, comprising in combination;
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means located at the transmitting end of said system for generating a time division multiplexed bit stream of a plurality of communications channels in respective time slots of a time frame period; channel selector control means for selecting a predetermined number of channels less than said plurality of communications channels to be transmitted to the receiving end of said system; means coupled to said bit stream generating means and being controlled by said channel selector control means for providing as an output said predetermined number of channels as respective bits of said bit stream in each said frame period; means responsive to each bit of said bit stream for generating a pair of coded signals which upon receipt and detection produces an impulse autocorrelation function signal; means for multiplexing said coded signals and transmitting multiplexed signals to said receiving end; means located at said receiving end for demultiplexing said multiplexed signals whereby said pair of coded signals are again provided; code detector means coupled to said pair of coded signals for producing first and second impulse autocorrelation function signals; and means for adding said first and second autocorrelation function signals to provide respective lobeless impulse output signals of said selected channels.
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2. A multichannel time division multiplexed communications system including a transmitting end and a receiving end, comprising in combination:
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means located at the transmitting end of said system for generating a time division multiplexed bit stream of a plurality of communications channels in respective time slots of a time frame period; channel selector control means for selecting a predetermined number of channels less than said plurality of communications channels to be transmitted to the receiving end of said system; means coupled to said bit stream generating means and being controlled by said channel selector control means for enabling said predetermined number of channels to be provided as respective bits of said bit stream in each frame period; means responsive to each bit of said bit stream for generating a pair of noise coded signals; means for multiplexing said noise coded signals and transmitting multiplexed noise coded signals to said receiving end; means located at said receiving end for demultiplexing said multiplexed noise coded signals whereby said pair of noise coded signals are again provided; noise code detector means coupled to said pair of noise coded signals for providing a first and second intermediate output signal; and means for combining said first and second intermediate output signals to provide composite output signals of said selected channels. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9)
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Specification