grad_jakes.m

jakes模型

%--------------------------------------------------------------------
% grad_Jakes.m ------------------------------------------------------
%
% Computation of the analytical gradient of the error function for
% the optimization of the discrete Doppler frequencies (Jakes PSD).
%
% Used m-file: acf_mue.m
%--------------------------------------------------------------------
% G=grad_Jakes(x)
%--------------------------------------------------------------------
% Explanation of the input parameters:
%
% x: parameter vector to be optimized
function G=grad_Jakes(x)

load data

f_i_n=x;
r=acf_mue(f_i_n,c_i_n,tau);
D=Jo-r;
F=norm(D,p);
G=[];
for k=1:N_i,
    g=F^(1-p)*D.^(p-1)*(2*pi*c_i_n(k)^2*tau.*sin(2*pi*f_i_n(k)*tau)).';
    G=[G;g];
end