OFDM通信系统与QPSK系统性能比较(16)

count=count+1; end end

%+++++++++++++++++++++++++++++++++++++++++++++++

%++++++++++++++++++计算误码率++++++++++++++++++++++++ for k=1:N

if(outsign(k)~=datain(k)) counter=counter+1; end end end

Pe(SNR_System)=counter/(N*frame_num); end

%画图 figure plot(Pe,'b'); xlabel('信噪比'); ylabel('误码率');

title('不同信噪比下的误码率'); grid on;

%********************** preparation part *************************** para=64; % Number of parallel channel to transmit (points) fftlen=64; % FFT length

nd=1; % Number of information OFDM symbol for one loop ml=2; % Modulation level : QPSK gilen=8; % Length of guard interval (points)

%**************************Data generation ****************************