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24 lines
607 B
Matlab
24 lines
607 B
Matlab
11 years ago
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function [c] = lte_generate_prs_c(c_init, seq_len)
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% Initialize the m-sequences
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x1 = zeros(1,1600+seq_len);
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x2 = zeros(1,1600+seq_len);
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tmp = c_init;
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for(n=0:30)
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x2(30-n+1) = floor(tmp/(2^(30-n)));
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tmp = tmp - (floor(tmp/(2^(30-n)))*2^(30-n));
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end
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x1(0+1) = 1;
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% Advance m-sequences
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for(n=0:1600+seq_len)
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x1(n+31+1) = mod(x1(n+3+1) + x1(n+1), 2);
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x2(n+31+1) = mod(x2(n+3+1) + x2(n+2+1) + x2(n+1+1) + x2(n+1), 2);
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end
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% Generate c
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for(n=0:seq_len-1)
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c(n+1) = mod(x1(n+1600+1) + x2(n+1600+1), 2);
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end
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end
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