www.pudn.com > tryGUI.rar > uwb_sv_params.m

function [Lam,lambda,Gam,gamma,std_ln_1,std_ln_2,nlos,std_shdw] = uwb_sv_params( cm_num ) 
% Return S-V model parameters for standard UWB channel models 
% Lam    Cluster arrival rate (clusters per nsec) 
% lambda Ray arrival rate (rays per nsec) 
% Gam    Cluster decay factor (time constant, nsec) 
% gamma  Ray decay factor (time constant, nsec) 
% std_ln_1 Standard deviation of log-normal variable for cluster fading 
% std_ln_2 Standard deviation of log-normal variable for ray fading 
% nlos   Flag for non line of sight channel 
% std_shdw  Standard deviation of log-normal shadowing of entire impulse response 
 
if cm_num == 1,        % based on TDC measurements for LOS 0-4m 
  Lam = 0.0233;  lambda = 2.5; 
  Gam = 7.1; gamma = 4.3; 
  std_ln_1 = 4.8 / sqrt(2); 
  std_ln_2 = 4.8 / sqrt(2); 
  nlos = 0; 
  std_shdw = 3; 
elseif cm_num == 2,    % based on TDC measurements for NLOS 0-4m 
  Lam = 0.4;  lambda = 0.5; 
  Gam = 5.5; gamma = 6.7; 
  std_ln_1 = 4.8 / sqrt(2); 
  std_ln_2 = 4.8 / sqrt(2); 
  nlos = 1; 
  std_shdw = 3; 
elseif cm_num == 3,    % based on TDC measurements for NLOS 4-10m 
  Lam = 0.0667;  lambda = 2.1; 
  Gam = 14.00; gamma = 7.9; 
  std_ln_1 = 4.8 / sqrt(2); 
  std_ln_2 = 4.8 / sqrt(2); 
  nlos = 1; 
  std_shdw = 3; 
elseif cm_num == 4,    % 25 nsec RMS delay spread bad multipath channel 
  Lam = 0.0667;  lambda = 2.1; 
  Gam = 24; gamma = 12; 
  std_ln_1 = 4.8 / sqrt(2); 
  std_ln_2 = 4.8 / sqrt(2); 
  nlos = 1; 
  std_shdw = 3; 
end 
 
return