| 摘要 |
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 = B0 +(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, B0 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 *nl*M)/Bs ∉ Z, for nl=0,1,...,(Bs/M)-1. |
