gen_rice_proc.m

《移动衰落信道》Mobiel_Fading_Channels一书后面的相关仿真程序。

%-------------------------------------------------------------------- 
% gen_Rice_proc.m --------------------------------------------------- 
% 
% Program for the simulation of deterministic generalized Rice  
% processes (see Fig. 6.29). 
% 
% Used m-files: parameter_Jakes.m, Mu_i_t.m 
%-------------------------------------------------------------------- 
% xi_t=gen_Rice_proc(N_1,N_2,sigma_1_2,sigma_2_2,kappa_0,... 
%                    theta_0,rho,theta_rho,f_max,... 
%                    T_s,T_sim,PLOT) 
%-------------------------------------------------------------------- 
% Explanation of the input parameters: 
% 
% N_1, N_2: number of harmonic functions of the real deterministic   
%           Gaussian processes nu_1(t) and nu_2(t), respectively 
% sigma_1_2: average power of the real deterministic Gaussian  
%            process nu_1(t) 
% sigma_2_2: average power of the real deterministic Gaussian  
%            process nu_2(t) 
% kappa_0: frequency ratio f_min/f_max (0<=kappa_0<=1) 
% theta_0: phase shift between mu_1_n(t) and mu_2_n(t) 
% rho: amplitude of the LOS component m(t) 
% theta_rho: phase of the LOS component m(t) 
% f_max: maximum Doppler frequency 
% T_s: sampling interval 
% T_sim: duration of the simulation 
% PLOT: plot of the deterministic generalized Suzuki process xi(t),  
%       if PLOT==1  
 
function xi_t=gen_Rice_proc(N_1,N_2,sigma_1_2,sigma_2_2,kappa_0,... 
                            theta_0,rho,theta_rho,f_max,T_s,... 
                            T_sim,PLOT) 
 
if nargin==11, 
   PLOT=0; 
end 
 
[f1,c1,th1]=parameter_Jakes('es_j',N_1,sigma_1_2,f_max,'rand',0); 
c1=c1/sqrt(2); 
 
N_2_s=ceil(N_2/(2/pi*asin(kappa_0))); 
[f2,c2,th2]=parameter_Jakes('es_j',N_2_s,sigma_2_2,f_max,'rand',0); 
f2 =f2(1:N_2); 
c2 =c2(1:N_2)/sqrt(2); 
th2=th2(1:N_2); 
 
N=ceil(T_sim/T_s); 
t=(0:N-1)*T_s; 
 
xi_t=abs(Mu_i_t(c1,f1,th1,T_s,T_sim)+... 
         Mu_i_t(c2,f2,th2,T_s,T_sim)+rho*cos(theta_rho)+... 
         j*(Mu_i_t(c1,f1,th1-theta_0,T_s,T_sim)+... 
         Mu_i_t(c2,f2,th2+theta_0,T_s,T_sim)+... 
         rho*sin(theta_rho))); 
 
if PLOT==1, 
   plot(t,20*log10(xi_t),'b-') 
   xlabel('t (s)') 
   ylabel('20 log xi(t)') 
end