D-PSK DEMODULATION BASED ON CORRELATION ANGLE DISTRIBUTION

摘要

An apparatus and method is described that provides optimal D-PSK demodulation based on the distribtion of phase differences between successive D-PSK symbols. A pluarlity of D-PSK data symbols are received, and each symbol is characterized by a real component and an imaginary component. An angle of correlation between any two successive symbols is calculated. A variance of correlation angles is obtained by using data symbols or pilot symbols, if available. The probability of the correlation angle being each of possible phase difference according the D-PSK constellation is then determined. From the probabilities of the particular correlation angle, a probability of each input bit being a "0" or "1" is determined.