create_freq_offset.m

MATLAB Simulation of OFDM System

function offset_sig = create_freq_offset(input_signal, freq_offset);

global sim_consts;

n_signals = size(input_signal,1);

time_base = (0:(length(input_signal)-1))/sim_consts.SampFreq;

% 产生相位旋转向量
phase_rotation = repmat(exp(j*2*pi*freq_offset*time_base), n_signals, 1);

%输入信号乘以exp(j*2*pi*freq_offset*time_base).即相位旋转
offset_sig = input_signal.*phase_rotation;