mtx_add_inter.m

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%  Property of Freescale
%  Freescale Confidential Proprietary
%  Freescale Copyright (C) 2005 All rights reserved
%  ----------------------------------------------------------------------------
%  $RCSfile: mTx_add_inter.m.rca $
%  $Revision: 1.1 $
%  $Date: Mon Jan 22 10:28:18 2007 $
%  Target: Matlab
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%
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% alpha = mTx_add_inter (N) generates interleaved address
% information for CTC interleaver defined in step 2 of
% subsection 8.4.9.2.3.2 CTC interleaver
%
% Output:
% alpha => Address information for CTC interleaver
% Inputs:
% N => No. of couples in one block equal to Nep/2

function alpha = mTx_add_inter (N)

% P0, P1, P2, P3 => Parameters P0, P1, P2, P3 in the Table 327
[P0,P1,P2,P3] = mTx_p_gen (N);

for j = 0:N-1
    switch mod(j,4)
        case 0
            alpha(j+1) = mod(P0*j+1,N);
        case 1
            alpha(j+1) = mod(P0*j+1+N/2+P1,N);
        case 2
            alpha(j+1) = mod(P0*j+1+P2,N);
        case 3
            alpha(j+1) = mod(P0*j+1+N/2+P3,N);
    end
end