Synchronization of a spread-spectrum receiver by a microprocessor control system

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Synchronization of a spread-spectrum receiver by a microprocessor control system

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The use of a microprocessor to control the synchronization of a low-data-rate spread-spectrum system is described. The microprocessor controls a voltage-controlled oscillator and sequence-generator, and carries out the correlation processes needed for the acquisition and tracking modes. Switching between modes is achieved by changing an interrupt vector.

Inspec keywords: radio receivers; communications computer control; digital communication systems; radiocommunication

Other keywords: pseudo random subcarrier; voltage controlled oscillator; sequence inversion modulation; microprocessor control; sequence generator; correlation processes; spread spectrum receiver; acquisition and tracking modes

Subjects: Radio and television receivers; Control applications in radio and radar; Communications computing; Radio links and equipment

References

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      • R.B. Ward . Digital communications on a pseudonoise tracking link using sequence inversion modulation. IEEE Trans. on Communications , 69 - 78
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      • A.C. Davies , L.A.A. Al-Rawas . Error-signal generation for pseudonoise tracking loops. IEE J. on Electronic Circuits and Systems , 189 - 192
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      • : `Spread spectrum communications', report no. LS-58, AGARD, 1973.
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      • W.J. Gill . A comparison of binary delay-lock tracking-loop implementations. IEEE Trans. on Aerospace and Electronic Systems , 415 - 424
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      • R. Dixon . (1976) , Spread spectrum techniques.
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      • J.G. Proakis . , Digital communications.
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      • R.C. Dixon . (1984) , Spread spectrum systems.
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      • J.J. Spilker . Delay-lock tracking of binary signals. IEEE Trans. on Space Electronics and Telemetry , 1 - 8
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