stat_laplacian.m

这是一个关于ofdm在802.11协议下的源码

function [composite_AoA_deg, composite_sigma_deg] = ...
    stat_laplacian(number_clusters, Q, AoA_deg, sigma_deg, ...
	delta_phi_deg)
% [composite_AoA_deg, composite_sigma_deg] = ...
%    stat_laplacian(number_clusters, Q, AoA_deg, sigma_deg, ...
%    delta_phi_deg)
%
% Computes the composite AoA and sigma of the multi-cluster
% Laplacian PAS
%
%
% STANDARD DISCLAIMER
%
% CSys is furnishing this item "as is". CSys does not provide any
% warranty of the item whatsoever, whether express, implied, or
% statutory, including, but not limited to, any warranty of
% merchantability or fitness for a particular purpose or any
% warranty that the contents of the item will be error-free.
%
% In no respect shall CSys incur any liability for any damages,
% including, but limited to, direct, indirect, special, or
% consequential damages arising out of, resulting from, or any way
% connected to the use of the item, whether or not based upon
% warranty, contract, tort, or otherwise; whether or not injury was
% sustained by persons or property or otherwise; and whether or not
% loss was sustained from, or arose out of, the results of, the
% item, or any services that may be provided by CSys.
%
% (c) Laurent Schumacher, AAU-TKN/IES/KOM/CPK/CSys - September 2002

AoA_rad       = AoA_deg*pi/180;
sigma_rad     = sigma_deg*pi/180;
delta_phi_rad = delta_phi_deg*pi/180;

composite_AoA_rad = sum(AoA_rad.*Q.*...
                    (1-exp((-1).*sqrt(2).*(delta_phi_rad./sigma_rad))));

composite_sqr_sigma_rad = 0;
for (k = 1:1:number_clusters)
    z = sqrt(2)*(AoA_rad(k)-composite_AoA_rad)/sigma_rad(k);
    composite_sqr_sigma_rad = composite_sqr_sigma_rad + ...
                              .25*Q(k)*(sigma_rad(k)^2)*(z^2-2*z+2);
    z = sqrt(2)*(AoA_rad(k)-composite_AoA_rad-delta_phi_rad(k))/sigma_rad(k);
    composite_sqr_sigma_rad = composite_sqr_sigma_rad - ...
                              .25*Q(k)*(sigma_rad(k)^2)*...
                              exp((-1)*sqrt(2)*(delta_phi_rad(k)/sigma_rad(k)))*...
                              (z^2-2*z+2);
    z = (-1)*sqrt(2)*(AoA_rad(k)-composite_AoA_rad+delta_phi_rad(k))/sigma_rad(k);
    composite_sqr_sigma_rad = composite_sqr_sigma_rad - ...
                              .25*Q(k)*(sigma_rad(k)^2)*...
                              exp((-1)*sqrt(2)*(delta_phi_rad(k)/sigma_rad(k)))*...
                              (z^2-2*z+2);
    z = (-1)*sqrt(2)*(AoA_rad(k)-composite_AoA_rad)/sigma_rad(k);
    composite_sqr_sigma_rad = composite_sqr_sigma_rad + ...
                              .25*Q(k)*(sigma_rad(k)^2)*(z^2-2*z+2);
end;
composite_AoA_deg = composite_AoA_rad*180/pi;
composite_sigma_deg = sqrt(composite_sqr_sigma_rad)*180/pi;