diff --git a/src/algorithms/telemetry_decoder/gnuradio_blocks/beidou_b1i_telemetry_decoder_cc.cc b/src/algorithms/telemetry_decoder/gnuradio_blocks/beidou_b1i_telemetry_decoder_cc.cc
index 6f50fd1c5..b60dd8f63 100644
--- a/src/algorithms/telemetry_decoder/gnuradio_blocks/beidou_b1i_telemetry_decoder_cc.cc
+++ b/src/algorithms/telemetry_decoder/gnuradio_blocks/beidou_b1i_telemetry_decoder_cc.cc
@@ -317,8 +317,13 @@ void beidou_b1i_telemetry_decoder_cc::set_satellite(const Gnss_Satellite &satell
             volk_gnsssdr_free(d_secondary_code_symbols);
             volk_gnsssdr_free(d_subframe_symbols);
 
+            d_samples_per_symbol = (BEIDOU_B1I_CODE_RATE_HZ / BEIDOU_B1I_CODE_LENGTH_CHIPS) / BEIDOU_D2NAV_SYMBOL_RATE_SPS;
+            d_symbols_per_preamble = BEIDOU_DNAV_PREAMBLE_LENGTH_SYMBOLS;
+            d_samples_per_preamble = BEIDOU_DNAV_PREAMBLE_LENGTH_SYMBOLS * d_samples_per_symbol;
             d_secondary_code_symbols = nullptr;
             d_preamble_samples = static_cast<int32_t *>(volk_gnsssdr_malloc(d_samples_per_preamble * sizeof(int32_t), volk_gnsssdr_get_alignment()));
+            d_preamble_period_samples = BEIDOU_DNAV_PREAMBLE_PERIOD_SYMBOLS*d_samples_per_symbol;
+            //d_subframe_length_symbols = BEIDOU_DNAV_PREAMBLE_PERIOD_SYMBOLS;
 
             // Setting samples of preamble code
             int32_t n = 0;
diff --git a/src/utils/matlab/hybrid_observables_plot_sample.m b/src/utils/matlab/hybrid_observables_plot_sample.m
index 9105c5bbd..2a8a784e5 100644
--- a/src/utils/matlab/hybrid_observables_plot_sample.m
+++ b/src/utils/matlab/hybrid_observables_plot_sample.m
@@ -29,10 +29,10 @@
 clearvars;
 close all;
 addpath('./libs');
-samplingFreq       = 6625000;     %[Hz]
-channels=5;
-path='/archive/';
-observables_log_path=[path 'glo_observables.dat'];
+samplingFreq       = 25000000;     %[Hz]
+channels=10;
+path='/home/dmiralles/Documents/gnss-sdr/';
+observables_log_path=[path 'observables.dat'];
 GNSS_observables= read_hybrid_observables_dump(channels,observables_log_path);
 
 %%