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Efficient ternary transmission codes

Efficient ternary transmission codes

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To limit distortion in digital cable systems due to low-frequency cuts, it has been usual either to use quantised feedback or use a code with a finite digital-sum variation. It is shown that these restrictions are unnecessarily stringent. Systems typically use 3-level codes, and some codes requiring less bandwidih than the 4B3T type are analysed.

References

    1. 1)
      • F.D. Waldhauer . Quantized feedback in an experimental 280 Mb/s digital repeater for coaxial transmission. IEEE Trans. , 1 - 5
    2. 2)
      • Jessop, A., Waters, D.B.: `4B3T, an efficient code for pcm coaxial line systems', Proceedings of 7th international scientific congress on electronics, 1970.
    3. 3)
      • Sheppard, D.: `Error detection in pcm', 06211/73, British Patent Application, .
    4. 4)
      • Beghelli, F., Bellato, L., Cariolaro, G.: `Power spectrum comparison of some 4B3T pseudoternary codes', International conference on communications, 1973, Seattle, USA, Proc. Inst. Elec. Electron. Eng., 1, p. 7/30–36.
    5. 5)
      • Catchpole, R.J.: `Digital line codes and their effect on repeater spacing', Proceedings of IEE Conference on Telecommunications, 1975, London.
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