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- removed hard coded numbers

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git-svn-id: http://moon:8086/svn/matlab/trunk@61 801c6759-fa7c-4059-a304-17956f83a07c
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jens
2015-05-02 18:22:34 +00:00
parent 377809cf7c
commit 01a77011ea
1 changed files with 11 additions and 9 deletions
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ofdm/ofdm_rx.m
+11 -9
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@@ -187,13 +187,13 @@ fprintf('Frame timing acquisition\n');
bins = c2i(N, carrier_time);
kc_max = -1000;
n_max = 0;
skip_syms = 15*4;
for n=0:15-1
skip_syms = ofdm_drm_params.nspf*4;
for n=0:ofdm_drm_params.nspf-1
frame_timing_Z = 0;
k = skip_syms+n;
for m=1:2
[kc valid frame_timing_Z] = timing_frame(Z_(bins, k)', bins, 15, frame_timing_Z);
k = k + 15;
[kc valid frame_timing_Z] = timing_frame(Z_(bins, k)', bins, ofdm_drm_params.nspf, frame_timing_Z);
k = k + ofdm_drm_params.nspf;
end
if valid
if kc > kc_max
@@ -244,6 +244,8 @@ kk = 1;
H_ = [];
df_track_ = [];
MIN_ABS_H = 1e-10;
eps_abs_h = MIN_ABS_H;
start = skip_syms+frame_start;
for k=start:length(Z_)
@@ -259,7 +261,7 @@ for k=start:length(Z_)
H_gain_cell{m+1} = (H_);
str = sprintf('Frame %d, s=%d, m=%d, n=%d', k, s, m, n);
if kk > 6
if kk > frames_per_window
ii = 1+mod(m+symbols_to_delay-1+(0:frames_per_window-1), frames_per_window);
H_gain = [H_gain_cell{ii}];
@@ -274,14 +276,14 @@ for k=start:length(Z_)
% get frequency error
% correlate wiener filtered channel with raw estimate
df_track = 12000/(2*pi*N)*angle(H_pilots * Hr' + MIN_ABS_H);
df_track = fs/(2*pi*N)*angle(H_pilots * Hr' + eps_abs_h);
df_track_ = [df_track_ df_track];
% check for too small values
rms_H = sqrt( abs( H_syms*H_syms' )/length(H_syms) );
MIN_ABS_H = max( rms_H/20, 1e-10 ); %quick and dirty fixed settings
H_too_small_index = find( abs(H_syms)<MIN_ABS_H );
H_syms( H_too_small_index ) = MIN_ABS_H;
eps_abs_h = max( rms_H/20, MIN_ABS_H ); %quick and dirty fixed settings
H_too_small_index = find( abs(H_syms)<eps_abs_h );
H_syms( H_too_small_index ) = eps_abs_h;
% equalize symbol
sym_eq = sym ./ H_syms;