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Abstract

Method for interleaving a bit flow in a mobile telephone system, said flow being subdivided into bit blocks, in their turn diagonally subdivided into bit sub-blocks according to the formula i(B,j)=c(n,k), in which k=0,1, . . . , Bs-1; n=0, 1, . . . , N, N+1, . . . ; B=B.sub.0+(M/2)*n+(k mod M); j=2*(X mod (Bs/M))+((k mod M) div (M/2)); c(n,k) is the n-th block of the bit flow in input to the interleaving unit i(B,j) is the B-th sub-block of interlaced bits, B.sub.0 is the first sub-block containing the bits coming from the first block of said bit flow, M is an even positive number and Bs is a positive number divisible by M, in which the distance among the bits inside a sub-block is controlled through the variation of a first parameter .alpha., the shift in the insertion of bits between adjacent sub-blocks is controlled through a second parameter .beta., and X is an expression correlating said parameters .alpha. and .beta. according to the formula X=(.alpha.*(k div M)-.beta.*(k mod M)), in which (.alpha.*n1*M)/BsZ, for n1=0, 1, . . . , (Bs/M)-1.

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First Claim