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US 5,179,572 AGranted
Spread spectrum conference calling system and method
AssigneeSCS Mobilecom, Inc.
InventorDonald L. Schilling
Life of this patent
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AssigneeSCS Mobilecom, Inc.
InventorDonald L. Schilling
Estimating the term…
A spread-spectrum-conference-calling receiver, for use over a communications channel. At each of a plurality of spread-spectrum transmitters, a transmitter-generic-chip-code generator generates a generic-chip-code signal and a transmitter-message-chip-code generator generates a message-chip-code signal. An EXCLUSIVE-OR gate spread-spectrum processes message data with the message-chip-code signal to generate a spread-spectrum signal. The combiner combines the generic-chip-code signal and the spread-spectrum-processed signal. A plurality of receiver-generic-chip-code generators generate a plurality of replicas of the generic-chip-code signal. Each receiver-generic mixer recovers a carrier signal from one of the plurality of received spread-spectrum-communications signals. A plurality of receiver-message-chip-code generators generate a plurality of replica of the message-chip-code signals. A plurality of receiver-message mixers despread one of the plurality of received spread-spectrum-communications signal as a modulated-data signal. Tracking and acquistion circuits use the recovered carrier signal for synchronizing the replicas of the generic-chip-code signals to the recovered carrier signals, respectively. An envelope detector demodulates the modulated-data signal as a demodulated signal.
A spread-spectrum-conference-calling receiver for simultaneously listening to a plurality of spread-spectrum channels of a plurality of received spread-spectrum-communications signals comprising:
The spread-spectrum conference-calling receiver as set forth in claim I wherein:
A spread-spectrum-conference-calling receiver for simultaneously listening to a plurality of spread-spectrum channels of a plurality of received spread-spectrum-communications signals comprising:
A spread-spectrum-conference-calling receiver for simultaneously listening to a plurality of spread-spectrum channels of a plurality of received spread-spectrum-communications signals comprising:
A spread-spectrum-conference-calling receiver for simultaneously listening to a plurality of spread-spectrum channels of a plurality of received spread-spectrum-communications signals comprising:
A method for simultaneously listening to a plurality of spread-spectrum channels of a plurality of received spread-spectrum communications signals, comprising the steps for each spread-spectrum channel of:
Dependencies are inferred from the claim text.