METHOD AND APPARATUS FOR SYNCHRONIZING PSEUDORANDOM CODED DATA SEQUENCES
First Claim
1. A method of maintaining synchronization between pseudorandom generators at separate locations when a communication channel is being used on a time shared, non-continuous basis, comprising the steps of:
- generating, by individual stations, a periodic time period for transmission or reception of a communications signal during the time period;
transmitting message bits a fixed number of bit durations after the leading edge of the time period;
coding said message bits with the output from a pseudorandom bit generator;
time correlating said coding and said time period with a common time generating source;
receiving transmitted messages by a receiver station;
delaying the received message until the instant of the trailing edge of the time period; and
deciphering the delayed message by combining the message with coding bits from a pseudorandom bit generator.
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Abstract
A simple means is provided for maintaining synchronization between pseudorandom generators at separate locations when a communication channel therebetween is being used on a timeshared, non-continuous basis. The pseudorandom coding device changes its coding state once per data bit. A timing system provides timing pulses to a transmitter-receiver circuit and to a pseudorandom coding unit. The coding unit encodes data to be transmitted and decodes data that has been received. Time correlation is maintained between the coding unit and the timing system by utilizing a common time generating source for timing and for clock pulses to the pseudorandom device.
24 Citations
2 Claims
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1. A method of maintaining synchronization between pseudorandom generators at separate locations when a communication channel is being used on a time shared, non-continuous basis, comprising the steps of:
- generating, by individual stations, a periodic time period for transmission or reception of a communications signal during the time period;
transmitting message bits a fixed number of bit durations after the leading edge of the time period;
coding said message bits with the output from a pseudorandom bit generator;
time correlating said coding and said time period with a common time generating source;
receiving transmitted messages by a receiver station;
delaying the received message until the instant of the trailing edge of the time period; and
deciphering the delayed message by combining the message with coding bits from a pseudorandom bit generator.
- generating, by individual stations, a periodic time period for transmission or reception of a communications signal during the time period;
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2. Asystem for synchronizing communication signals transmitted over a common transmission medium, the system having a plurality of stations each comprising:
- a. a transmitter and receiver for coupling signals to and from the common transmission medium;
b. storage apparatus coupled to said receiver for storing signals from the receiver as received and for providing those signals to an output upon receipt of control signals;
c. pseudorandom means for coding data prior to transmission and decoding received data comprising
- a. a transmitter and receiver for coupling signals to and from the common transmission medium;
Specification
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- Resources
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Current AssigneeTonis Tilk
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Original AssigneeTonis Tilk
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InventorsTilk, Tonis
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Primary Examiner(s)Stewart, David L.
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Application NumberUS05/367,697Time in Patent Office544 DaysField of Search179/15BS,1.5R,1.5S 178/69SR,22 325/32,122US Class Current370/515CPC Class CodesH04J 13/00 Code division multiplex sys...H04J 3/0611 PN codes H04J3/0608 takes p...
