This a complete matlab under the spread spectrum communication system simulation source code. Including QPSK modulation, m sequence generation, modulation, demodulation, despreading and other operations. Very complete, the code through the debugger, you can run directly.

QPSK_15\bi_to_uni.m
.......\carrier_mod.m
.......\carrier_remod.m
.......\despread_spectrum.m
.......\dpxs.m
.......\F2T.m
.......\jiekuozlp.m
.......\kuopinzlp.m
.......\kuopinzlp1.m
.......\lpf.m
.......\m_sequence.m
.......\par_to_ser.m
.......\qpskzlp.m
.......\qpskzlpbeifen.m
.......\rf_mod.m
.......\ser_to_par.m
.......\spread_spectrum.m
.......\T2F.m
QPSK_15

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