add_prefix.m

详细的OFDM设计过程

function cyclic_frames = add_prefix(frames,nr_cyclic_bits)

% function cyclic_frames = add_prefix(frames,nr_cyclic_bits)
% add a cyclic prefix of length nr_cyclic_bits at the beginning of a frame

% frames: frame input
% nr_cyclic_bits: number of bits in the cyclic prefix
% cyclic_frames: frame with the cyclic prefix added

% ------- add_prefix.m -----------------------------------
% Black team
% April-11-05
% ----------------------------------------------------------

prefix=frames(end-nr_cyclic_bits+1:end,:);
cyclic_frames=cat(1,prefix,frames);