cp0402_2pam_th.m

此文件收集了《超宽带无线电基础》一书中的所有关于UWB的matlab代码。是进行UWB仿真开发的好工具。

%
% FUNCTION 4.1 : "cp0402_2PAM_TH"
%
% Introduces the DS code given by 'DScode'
% and implements binary PAM modulation
% 'seq' is the input binary stream
% 'fc' is the sampling frequency for the generated signal
% 'Ts' is the average pulse repetition period
% 'DScode' is the DS code
%
% The function generates two output streams: 
% 'PAMTHseq' is the output with both TH and PAM
% 'THseq' is the output with TH only
%
% Programmed by Guerino Giancola
%

function [PAMTHseq,THseq] = ...
   cp0402_2PAM_TH(seq,fc,Tc,Ts,THcode)


% --------------------------------------------------
% Step One - Implementation of the PAM+TH modulator
% --------------------------------------------------

dt = 1 ./ fc;              % sampling period
framesamples=floor(Ts./dt);% number of samples between
                           % pulses
chipsamples = floor (Tc ./ dt);  % number of samples for
                                 % the chip duration

THp = length(THcode);            % TH-code length

totlength = framesamples*length(seq);
PAMTHseq=zeros(1,totlength);
THseq=zeros(1,totlength);

% ---------------------------------------
% Step Two - Main loop for introducing TH
% ---------------------------------------

for k = 1 : length(seq)
    
    % uniform pulse position
    index = 1 + (k-1)*framesamples;
    

    % introduction of TH
    kTH = THcode(1+mod(k-1,THp));
    index = index + kTH*chipsamples;
    
    THseq(index)=1;   
    PAMTHseq(index)=((seq(k)*2)-1);

end % for k = 1 : length(seq)