Signal demodulation method and device

摘要

The present invention provides a signal demodulation method and device. The method includes: obtaining a symbol probability parameter, where the symbol probability parameter comprises: an amplitude ry and a phase angle φy of a receive signal, an amplitude rxj and a phase angle φxj of each constellation point xj in a decision constellation point set, and a standard deviation σn of Gaussian noise and a standard deviation πθ of phase noise; calculating, according to the symbol probability parameter, a symbol probability that a transmit signal is each constellation point xj in the decision constellation point set; and performing demodulation according to the symbol probability, and outputting demodulation information. The present invention improves an anti-phase-noise capability.

主权项

1. A signal demodulation method, comprising:
obtaining, by a parameter obtaining unit, a receive signal; obtaining, by the parameter obtaining unit, a symbol probability parameter of the receive signal, wherein the symbol probability parameter comprises:
amplitude ry and phase angle φy of the receive signal,amplitude rxj and phase angle φxj of each constellation point xj in a decision constellation point set, anda standard deviation σn of Gaussian noise and a standard deviation σθ of phase noise, wherein the decision constellation point set is located in a modulation constellation graph for performing signal demodulation; calculating, by a probability calculation unit, according to the symbol probability parameter, a symbol probability that a transmit signal corresponding to the receive signal is each constellation point xj in the decision constellation point set, wherein the calculating the symbol probability that the transmit signal corresponding to the receive signal is each constellation point xj in the decision constellation point set comprises calculating:Pr⁡(x=xj/y)=ry4⁢πσn⁢exp⁡(-(ry-rxj)22⁢σn2-rxj⁢ry⁡(φy-φxj)22⁢⁢vj)/vj wherein the vj=rxjryσθ2+σn2 and the Pr(x=xj/y) is the symbol probability; performing, by a demodulation processing unit, demodulation according to the symbol probability, and outputting demodulation information, wherein the demodulation information corresponds to a data bit corresponding to the transmit signal.