Abstract:

For suppressing Gaussian noise and narrowband interference, a Gaussian noise and narrowband interference suppression algorithm called cyclic side correlation replacement (CSCR) is presented. CSCR is on the basis of the further analysis of side correlation replacement. CSCR algorithm is used for reference SCR in cyclic spectrum. Using cyclic spectrum could suppress Gaussion noise effectively, CSCR algorithm reconstructs the expectation signal by replacing the value of symmetric band with the interference signals. In addition, Gaussian noise is suppressed on the axis of nonzero cyclic frequency because of the noncyclostationary character, so Gaussian noise and narrowband interference are both suppressed at the same time. The algorithm is suitable for the modulation mode that has the symmetry of spectral correlation density. At last, through the computer simulation for phase shift keying (2PSK) signal, it shows that the cyclic side correlation replacement algorithm can effectively suppress Gaussian noise and narrowband interference.

Key words: NBI, Gaussian noise, Cyclic Side Correlation Replacement (CSCR), 2PSK