insert_pilot.m

梳状导频方式下OFDM系统的LS、LMMSE算法比较

function [output,count,pilot_sequence]=insert_pilot(pilot_inter,pilot_symbol_bit,map_out_block) 
%pilot_inter
% pilot_symbol_bit  
% map_out_block 
pilot_symbol=qam16(pilot_symbol_bit); 
[N,NL]=size(map_out_block); %96 x 100
output=zeros((N+fix(N/pilot_inter+1)),NL); %128 x 100
pilot_sequence=pilot_symbol*ones(1,NL); %插入调制后的导频符号，导频符号全一样

count=0; 
i=1; 
while i<(N+fix(N/pilot_inter+1))     %即i<128
output(i,:)=pilot_sequence; 
count=count+1; 
 if count*pilot_inter<=N          %即3*count<96
  output((i+1):(i+pilot_inter),:)=map_out_block(((count-1)*pilot_inter+1):count*pilot_inter,:); 
 else 
  output((i+1):(i+pilot_inter+N-count*pilot_inter),:)=map_out_block(((count-1)*pilot_inter+1):N,:); 
 end 
i=i+pilot_inter+1; 
end