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High frequency spread spectrum communication system terminal

  • US 4,761,796 A
  • Filed: 01/24/1985
  • Issued: 08/02/1988
  • Est. Priority Date: 01/24/1985
  • Status: Expired due to Term
First Claim
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1. A spread spectrum communication system terminal comprising:

  • a first subsystem includingfirst means to encode locally generated digital data with an error correcting code,second means coupled to said first means for spectrum spreading of said encoded locally generated digital data in at least one mode of operation of said communication system terminal,third means to receive remotely generated error correcting code encoded digital data spectrum spread in said one mode of operation, andfourth means coupled to said third means to recover said remotely generated digital data;

    said encoded locally generated digital data and said encoded remotely generated digital data being processed in blocks of data bits, a second subsystem includingfifth means frequency hopping said encoded locally generated digital data prior to transmission to a remote location, andsixth means frequency dehopping said encoded remotely generated digital data received from said remote location; and

    a third subsystem includingseventh means coupled to said second means and said fifth means to provide a predetermined signal for spectrum spreading of said encoded locally generated digital data in said one mode of operation and to couple said encoded locally generated digital data to said fifth means, andeighth means coupled to said third means, said fifth means said sixth means to provide a reference frequency for said frequency hopping and said frequency dehopping and to couple said frequency dehopped encoded remotely generated digital data from said sixth means to said third means,said first means and second means includinga first processor coupled to said seventh means,a first decision feedback equalizer/canceller coupled to said first processor, anda second processor coupled to said first processor and said first decision feedback equalizer/canceller to provide said encoded locally generated digital data, said third means and said four means includinga third processor and said second processor coupled to said eighth means,said first decision feedback equalizer/canceller coupled to said second processor,a second decision feedback equalizer/canceller coupled to said third processor, andsaid first processor coupled to said first and second decision feedback equalizer/canceller to recover said encoded remotely generated digital data,said first, second and third processors operating according to predetermined data rate algorithms when said locally generated and remotely generated data rates are from 1200-4800 bits per second and spectrum spreading is not provided in the mode of operation of said communication system,said first, second and third processors operating according to algorithms providing operation against jamming signals when said locally generated and said remotely generated data rates are below 1200 bits per second and spectrum spreading is provided in this mode of operation of said communication system.

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