Patent ID: 6061407
Filing Date: 2000-05-09
Classification: H04L

Abstract:
Method for transmission of trellis-coded signals over channels with intersymbol interference, comprising the following steps:encoding a vector sequence of information bits i(D) into a symbol sequence a(D) with elements chosen from a set under control of a binary state-bit sequence y.sup.0 (D) consisting of elements y.sub.n.sup.0, the encoding operation being determined by a current trellis-code state at each time n;determining, in response to said symbol sequence a(D),(a) a sequence of channel input signals x(D) given byx(D)=a(D)-p(D)+c(D),where the sequence p(D) represents the intersymbol interference at an output of a channel with given response h(D), and the sequence c(D) is a sequence with elements chosen from a lattice .LAMBDA..sub.x underlying a power-efficient modulo extension of such that the power of said sequence x(D) is minimized, and(b) a trellis-coded sequence u(D) consisting of elements u.sub.n according tou(D)=a(D)+c(D)which represents a valid trellis-coded sequence at the output of a noiseless channel with said response h(D); anddetermining by next-state computation at each time n, from the element u.sub.n of said trellis-coded sequence u(D) and from the current trellis-code state, a next trellis-code state and the state-bit y.sub.n+1.sup.0 at time n+1, so that a valid continuation of said trellis-coded sequence u(D) is achieved.