jens
42cf28baf6
- calc W_pilots [RX] - added delta_freq for tracking (Zwischenstand) git-svn-id: http://moon:8086/svn/matlab/trunk@52 801c6759-fa7c-4059-a304-17956f83a07c
78 lines
2.4 KiB
Matlab
78 lines
2.4 KiB
Matlab
function [W_syms, W_pilots] = calcWiener(drm_mode, drm_bw)
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% calcWiener('B', '10k');
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[params, spec_occ] = drm_params(drm_mode, drm_bw);
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sigm = 10^(-14/10);
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Ns = (params.nu+params.ng);
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Nu = (params.nu);
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Ng = (params.ng);
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N = Nu;
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frames_per_window = 2*params.y;
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window_delay = params.y;
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num_symbols_per_frame = params.nspf;
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num_carrier_per_symbol = spec_occ.kmax - spec_occ.kmin;
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num_symbols_per_frame = num_symbols_per_frame * num_carrier_per_symbol;
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% PHI = auto-covariance-matrix
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f_cut_t = 0.0675*1/params.y; % two-sided maximum doppler frequency (normalized w.r.t symbol duration Ts)
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f_cut_k = 1.75*Ng/Nu; % two-sided maximum echo delay (normalized w.r.t useful symbol duration Tu)
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f_D_max = f_cut_t*12000/Ns/2
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tau_max = f_cut_k*Nu/12000/2
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W_syms = cell( params.y, 1 );
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W_pilots = cell( params.y, 1 );
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for d=0:window_delay-1
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k2_pos = [];
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t2_pos = [];
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ref_gain_a = [];
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for s=0:frames_per_window-1
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[c, p, a] = getRefGain(params, spec_occ, s+d);
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k2_pos = [k2_pos c]; % length = window_delay*frames_per_window
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t2_pos = [t2_pos ones(1, length(c))*(s)]; % length = window_delay*frames_per_window
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ref_gain_a = [ref_gain_a a];
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end
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num_gain_ref_per_window = length(k2_pos);
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carriers = spec_occ.kmin:spec_occ.kmax;
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PHI = zeros(num_gain_ref_per_window);
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% PHI
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for k1=1:num_gain_ref_per_window
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k2 = [1:num_gain_ref_per_window];
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k1_pos = k2_pos(k1);
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t1_pos = t2_pos(k1);
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PHI(k1,k2) = sinc(f_cut_k*(k1_pos-k2_pos)) .* sinc(f_cut_t*(t1_pos-t2_pos));
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end
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PHI = PHI + sigm*diag(2./(ref_gain_a.^2));
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PHI_inv = inv(PHI);
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% W_Syms
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THETA = zeros(1, num_gain_ref_per_window);
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% THETA
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for k1=1:length(carriers)
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k2 = [1:num_gain_ref_per_window];
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k1_pos = carriers(k1);
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t1_pos = window_delay;
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THETA(k2) = sinc(f_cut_k*(k1_pos-k2_pos)) .* sinc(f_cut_t*(t1_pos-t2_pos));
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W_syms{d+1}(:, k1) = transpose( THETA*PHI_inv );
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end
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% W_Pilots
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[c, p, a] = getRefGain(params, spec_occ, d);
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THETA = zeros(1, num_gain_ref_per_window);
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% THETA
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for k1=1:length(c)
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k2 = [1:length(k2_pos)];
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k1_pos = c(k1);
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t1_pos = frames_per_window-1;
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THETA(k2) = sinc(f_cut_k*(k1_pos-k2_pos)) .* sinc(f_cut_t*(t1_pos-t2_pos));
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W_pilots{d+1}(:, k1) = transpose( THETA*PHI_inv );
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end
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end
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W_syms
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W_pilots |