energytableinit.m

汪裕民的OFDM关键技术与应用中仿真MIMO-OFDM的源代码

function energytable = EnergyTableInit(SNR,M);
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%   根据SNR值，针对每个信道产生一个能量增加的表
%   输入：
%       subcar_gains    子载波增益
%       M               最大星座大小
%       Gap             系统Gap
%       Noise           噪声功率
%   输出：
%       energytable     能量表
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%   根据子载波增益，计算1，2，4，6，8bit给每个子载波传输所需要的能量
energytable = abs((1./SNR)'*(2.^([1:M+1]-1)));
energytable = abs((1./SNR)'*(2.^([1:M+1])))-energytable;

%   增加能量，从M增加到一个未分配的更高的值
energytable(:,M+1) = Inf*ones(size(energytable(:,M+1)));
for i =3:2:M
    energytable(:,i) = (energytable(:,i)+energytable(:,i+1))/2;
    energytable(:,i+1) = energytable(:,i);
end