Microprocessor implementation of tactical modems for data transmissions over v.h.f. radios

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Microprocessor implementation of tactical modems for data transmissions over v.h.f. radios

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© The Institution of Electrical Engineers
Published

The advent of the single-chip microprocessor has made possible the use of digital signal processing in low-cost communications circuitry. The all-digital approach has been used in a high-performance data modem for the transmission of burst messages through the voice channel of v.h.f. narrow band f.m. radio sets. The techniques used in this novel design of software modem are illustrated by reference to the version using coherent quadrature phase shift keying (q.p.s.k.) modulation and constraint length 48 convolutional encoding with sequential decoding.

Inspec keywords: military equipment; data communication equipment; radiocommunication; modems; digital signals

Other keywords: software modem; burst messages; digital signal processing; data transmissions; VHF narrow band FM radio; data modem; coherent quadrature phase shift keying; sequential decoding; constraint length 48 convolutional encoding

Subjects: Radio links and equipment; Digital signal processing; Data communication equipment and techniques; Modulators, demodulators, discriminators and mixers; Military communications; Military circuits, components, and equipment; Communications computing; Other data transmission

References

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      • J.M. Wozencraft , I.M. Jacobs . (1965) , Principles of Communication Engineering.
    2. 2)
      • Bucher, E.A.: `Error mechanisms for convolutional codes', 1968, Ph.D. Thesis, M.I.T. Cambridge, Mass.
    3. 3)
      • Gilhousen, K.S.: `Coding systems study for high data rate telemetry links', Linkabit Corporation Final Report, 1971.
    4. 4)
      • G.D. Forney , E.K. Bower . A high speed sequential decoder: prototype design and test. IEEE Trans on Communications , 5 , 821 - 835
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