Sequence detection method and device

The present invention discloses a sequence detection method and device. The device comprises an interference elimination module, a phase error calculation module, a Viterbi module, a judgment bit correction module and a cache module. A frequency domain sample signal is inputted, the interference elimination is carried out, and a judgment bit and a judgment variable are obtained; the judgment bit enters into the cache module so as to match the processing time delay introduced by the Viterbi module, the judgment variable and the judgment bit are inputted into the phase error calculation module so as to calculate a judgment error; an obtained judgment error variable is inputted to the Viterbi module, multiple judgment error variables are used to carry out combined detection, and a corrected judgment error variable value is obtained; the corrected judgment error variable value is used to correct the judgment bit, and finally an outputted correct bit is obtained. The sequence detection method and device can be app