uwb_sv_params.m

一种基于噪声模板的 uwb 仿真 将训练序列进行叠加

function [Lam,lambda,Gam,gamma,std_ln_1,std_ln_2,nlos,std_shdw] = uwb_sv_params( cm_num )   %返回四种信道的sv的参数，cm_num分别取cm1,cm2,cm3,cm4
% Return S-V model parameters for standard UWB channel models
% Lam    Cluster arrival rate (clusters per nsec)  簇平均到达速率
% lambda Ray arrival rate (rays per nsec)          脉冲平均达到速率
% Gam    Cluster decay factor (time constant, nsec)   簇的功率衰减因子
% gamma  Ray decay factor (time constant, nsec)       簇内脉冲的衰减因子
% std_ln_1 Standard deviation of log-normal variable for cluster fading
%簇的信道系数标准偏差
% std_ln_2 Standard deviation of log-normal variable for ray
% fading簇内脉冲信道系数标准偏差
% nlos   Flag for non line of sight channel 是否是直达径
% std_shdw  Standard deviation of log-normal shadowing of entire impulse response
%信道幅度增益的标准偏差
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