tfarma_sprf.m

用于模拟时变非平稳的ARMA过程

function Salpha= tfarma_sprf(Aml, Bml, N, alpha)
% function Salpha= tfarma_sprf(Aml, Bml, N, alpha)
%   This file is part of the TFPM toolbox v1.0 (c)
%   [e-mail] and underlies the GPL.
% 
% Computes the spreading function of an underspread TFARMA model. 

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if(0)% TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST
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clear;tfpm;
MAR  =   0;
LAR  =   0;
MMA  =   5;
LMA  =   3;
N    =  64;
re_im= 'r';
mo_no= 'm';
tfpm_file_gen;
%-------------
alpha= 1/2;

Anm= param_expand(Aml.*param_phase(MAR, LAR, N, alpha), N);
Bnm= param_expand(Bml.*param_phase(MMA, LMA, N, alpha), N);
H= ker_to_lag(tvarma_impr(Anm, Bnm), -1, alpha);
S= nm_to_ml(H);
figure(97);mesh(abs(S))
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end;% TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST
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Halpha= tfarma_impr(Aml, Bml, N, alpha);
Salpha= nm_to_ml(Halpha);

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if(0)% TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST
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figure(98);mesh(abs(Salpha))
figure(99);mesh(abs(S-Salpha))
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end;% TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST
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