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Diffstat (limited to 'gr-channels/grc/channels_selective_fading_model2.xml')
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diff --git a/gr-channels/grc/channels_selective_fading_model2.xml b/gr-channels/grc/channels_selective_fading_model2.xml new file mode 100644 index 0000000000..1e1ea3a70c --- /dev/null +++ b/gr-channels/grc/channels_selective_fading_model2.xml @@ -0,0 +1,128 @@ +<?xml version="1.0"?> +<!-- +################################################### +##Frequency Selective Fading Model +################################################### + --> +<block> + <name>Frequency Selective Fading Model2</name> + <key>channels_selective_fading_model2</key> + <import>from gnuradio import channels</import> + <make>channels.selective_fading_model2( $N, $fDTs, $LOS, $K, $seed, $delays, $delay_std, $delay_maxdev, $mags, $ntaps )</make> + <callback>set_fDTs($fDTs)</callback> + <callback>set_K($K)</callback> + <param> + <name>Num Sinusoids (Stochastic SoS model + delay drift)</name> + <key>N</key> + <value>8</value> + <type>int</type> + </param> + <param> + <name>Normalized Max Doppler (fD*Ts)</name> + <key>fDTs</key> + <value>0.2/samp_rate</value> + <type>real</type> + </param> + <param> + <name>LOS Model</name> + <key>LOS</key> + <type>enum</type> + <option> + <name>Rayleigh/NLOS</name> + <key>False</key> + <opt>hide_K:all</opt> + </option> + <option> + <name>Rician/LOS</name> + <key>True</key> + <opt>hide_K:</opt> + </option> + </param> + <param> + <name>Rician factor (K)</name> + <key>K</key> + <value>4.0</value> + <type>real</type> + <hide>$LOS.hide_K</hide> + </param> + <param> + <name>Seed</name> + <key>seed</key> + <value>0</value> + <type>int</type> + </param> + <param> + <name>PDP Delays (in samps)</name> + <key>delays</key> + <value>1.0,1.9,2.7</value> + <type>real_vector</type> + </param> + <param> + <name>PDP Delay StdDev (per samp)</name> + <key>delay_std</key> + <value>1e-4,1e-4,1e-4</value> + <type>real_vector</type> + </param> + <param> + <name>PDP Delay Max-Dev (per samp)</name> + <key>delay_maxdev</key> + <value>0.5,0.7,0.9</value> + <type>real_vector</type> + </param> + <param> + <name>PDP Magnitudes</name> + <key>mags</key> + <value>1,0.95,0.8</value> + <type>real_vector</type> + </param> + <param> + <name>Num Taps</name> + <key>ntaps</key> + <value>8</value> + <type>int</type> + </param> + <sink> + <name>in</name> + <type>complex</type> + </sink> + <source> + <name>out</name> + <type>complex</type> + </source> + <source> + <name>taps</name> + <type>message</type> + <optional>1</optional> + </source> + <doc> + int d_N=8; // number of sinusoids used to simulate gain on each ray + float d_fDTs=0.01 // normalized maximum doppler frequency (f_doppler / f_samprate) + float d_K=4; // Rician factor (ratio of the specular power to the scattered power) + bool d_LOS=true; // LOS path exists? chooses Rician (LOS) vs Rayleigh (NLOS) model. + int seed=0; // noise seed + int ntaps; // Number of FIR taps to use in selective fading model + + These two vectors comprise the Power Delay Profile of the signal + float_vector delays // Time delay in the fir filter (in samples) for each arriving WSSUS Ray + float_vector mags // Magnitude corresponding to each WSSUS Ray + + If using a LOS model, the first delay and mag should correspond with the LOS component + + References: + + The flat-fading portion of the algorithm implements the following + Compact Rayleigh and Rician fading simulator based on random walk processes + A. Alimohammad S.F. Fard B.F. Cockburn C. Schlegel + 26th November 2008 + (Alogrithm III) + ( with a novel addition of time delay tap random walk ) + + The frequency selective extension of the block roughly implements + A Low-Complexity Hardware Implementation of Discrete-Time + Frequency-Selective Rayleigh Fading Channels + F. Ren and Y. Zheng + 24-27 May 2009 + + Implementation by Tim O'Shea + </doc> +</block> |