single_packet.m

OFDM系统的仿真代码MATLAB环境下

function [inf_bits_cnt, inf_bit_errs, raw_bits_cnt, raw_bit_errs] = single_packet

global sim_consts;

% Generate tx signal, returns also information bits and raw bits
[txsignal, tx_inf_bits, tx_raw_bits] = transmitter;

% Two-path Rayleigh Channel
delay = 5;
[path_1, path_2] = multipath_channel;

% Signals that have passed through the channel
number_txsignal = length(txsignal);
for i = 1:delay
    rxsignal(i) = path_1(i).*txsignal(i);
end
for i = delay+1:number_txsignal
    rxsignal(i) = path_1(i).*txsignal(i)+path_2(i).*txsignal(i-delay);
end

% Add AWGN to signal
len = length(txsignal);
rxsignal = awgn(txsignal,20,'measured');
plot(1:len,txsignal,1:len,rxsignal);

% Receiver, return data bits and undecoded bits
[rx_inf_bits, rx_raw_bits] = receiver(rxsignal, tx_raw_bits);

% Calculate bit errors
traceback_len = 2;
[n1,r1] = biterr(rx_raw_bits,tx_raw_bits);
[n2,r2] = biterr(rx_inf_bits(traceback_len+1:end),tx_inf_bits(1:end-traceback_len));

disp(['The bit error rates are:   ',num2str([r1 r2])]);