| 摘要 |
A coding scheme of order n for digital communications, in particular optical communication, for obtaining a coded signalx(t) which represents binary data which are constituted by sequences of information bits {u} with rate T, the scheme having N=2n states, named .SIGMA.i, i=1,2,...,N, and comprising predetermined elementary signals si(t) which are combined in the signal x(t) . According to the scheme, if at the time t=kT the coding is in a state .SIGMA .m of the N states, the arrival of the information bit uk of the sequence {u} forces a transition to the state .SIGMA.q of the N states and the selection of the elementary signal si(t) as x(t), whereq and i are given by the following equations: d1=m-1 mod 2; d0=d1+uk mod 2; r=2(m-1)+d0; q=(r modN)+1; and (formula).
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