TWO CARRIER COMMUNICATION SYSTEM WITH SINGLE TRANSMITTER
First Claim
1. A multicarrier communication system comprising a transmitter, means for generating a clock signal, means for producing a plurality of independently modulated carrier signals, and means for cyclically switching to said transmitter each of said carrier signals in response to said clock signal, said means for proDucing said plurality of independently modulated carrier signals for each carrier signal comprising separate means for producing a subcarrier signal, means for biphase modulating said subcarrier signal with a unique data signal, wherein a pseudonoise code is added to said subcarrier, including means synchronized by said clock signal for generating said pseudonoise code in phase with the switching of said switching means, and means for adding said pseudonoise to said subcarrier, means for producing a carrier signal at a unique frequency, and means for phase modulating said carrier signal with said modulated subcarrier signal.
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Abstract
A pulse-code modulated communication system is disclosed for transmitting two subcarrier-modulated carriers from a single transmitter comprising two channels for phase modulating the two carriers independently. The modulating subcarriers are independently modulated by data and/or pseudonoise (PN) codes as desired. The modulated carriers are switched alternately to the single transmitter in synchronism with operation of a PN code generator when PN code modulation is present, as for ranging.
29 Citations
2 Claims
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1. A multicarrier communication system comprising a transmitter, means for generating a clock signal, means for producing a plurality of independently modulated carrier signals, and means for cyclically switching to said transmitter each of said carrier signals in response to said clock signal, said means for proDucing said plurality of independently modulated carrier signals for each carrier signal comprising separate means for producing a subcarrier signal, means for biphase modulating said subcarrier signal with a unique data signal, wherein a pseudonoise code is added to said subcarrier, including means synchronized by said clock signal for generating said pseudonoise code in phase with the switching of said switching means, and means for adding said pseudonoise to said subcarrier, means for producing a carrier signal at a unique frequency, and means for phase modulating said carrier signal with said modulated subcarrier signal.
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2. A multicarrier communications system as defined in claim 1 wherein said carrier signal for each modulated carrier is at a frequency equal to a desired carrier frequency divided by a number N, and said transmitter includes means for multiplying by said number N the frequencies of all modulated carriers transmitted.
Specification
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Current AssigneeMahlon F. Easterling
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Original AssigneeMahlon F. Easterling
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InventorsEasterling, Mahlon F.
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Primary Examiner(s)Griffin, Robert L.
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Assistant Examiner(s)Ellis, William T.
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Application NumberUS05/151,411Time in Patent Office727 DaysField of Search325/46,65,156,158,48,40,56 343/203,207,204 179/15A,15BM 178/67US Class Current375/308CPC Class CodesH04B 14/08 characterised by the use of...H04L 5/06 the signals being represent...
