GMSK signal low-complexity coherent demodulation method

The invention provides a GMSK signal low-complexity coherent demodulation method and aims at providing a coherent demodulation method achieving low complexity. The method is implemented by a following technical scheme: performing carrier phase synchronization on a GMSK signal s(kT) by means of a carrier phase-locked loop and outputting a same-phase baseband signal I1(kT) and a orthogonal baseband signal Q1(kT); performing accumulation and extraction on the orthogonal baseband signal under the control of a symbol synchronization pulse with a same-phase and orthogonal branch quadruple symbol rate by means of an integration clearing filter and outputting a same-phase baseband signal and a orthogonal baseband signal with a sampling rate equal to the quadruple symbol rate; filtering I3(mTs/4) and Q3(mTs/4) by means of a matching filter and outputting a same-phase baseband signal I4(mTs/4) subjected to matching filtering and a orthogonal baseband signal Q4(mTs/4) subjected to matching filtering; performing symbol equalization on the I4(mTs/4) and the Q4(mTs/4) by means of a symbol equalization filter, outputting a symbol same-phase baseband I5(nTs/) with inter-symbol interference eliminated and a orthogonal baseband symbol Q5(nTs/) with inter-symbol interference eliminated; and performing differential decoding on the orthogonal baseband symbol by means of a differential decoder and outputting demodulated bit information bn.