www.gusucode.com > 基于VBLAST-OFDM的MATLAB SIMULATION,图形化界面,并且给出了各仿真图 > 基于VBLAST-OFDM的MATLAB SIMULATION,图形化界面,并且给出了各仿真图/vblast-ofdm simulation/tx_modulate.m
function mod_symbols = tx_modulate(bits_in, modulation) full_len = length(bits_in); % BPSK modulation if ~isempty(findstr(modulation, 'BPSK')) % Angle [pi/4 -3*pi/4] corresponds to % Gray code vector [0 1], respectively. table=exp(j*[0 -pi]); % generates BPSK symbols table=table([1 0]+1); % Gray code mapping pattern for BPSK symbols inp=bits_in; mod_symbols=table(inp+1); % maps transmitted bits into BPSK symbols % QPSK modulation elseif ~isempty(findstr(modulation, 'QPSK')) % Angle [pi/4 3*pi/4 -3*pi/4 -pi/4] corresponds to % Gray code vector [00 10 11 01], respectively. table=exp(j*[-3/4*pi 3/4*pi 1/4*pi -1/4*pi]); % generates QPSK symbols table=table([0 1 3 2]+1); % Gray code mapping pattern for QPSK symbols inp=reshape(bits_in,2,full_len/2); mod_symbols=table([2 1]*inp+1); % maps transmitted bits into QPSK symbols else error('Unimplemented modulation'); end