Method and apparatus for correlation

Abstract

Abstract A correlator for determining the current correlation between a digitized signal and a predetermined correlation word comprises a register means (2') through which discrete signals of the digitized signal are caused to pass under the control of a clock. The correlation word comprises individual correlation values (c o -c 53 ) arranged in a plurality of successive correlation value groups (c o -c 8 , c 9 -c 17 , c 18 -c 26 , c 27 -c 35 , c 36 -c 44 , c 45 -c 53 ). The correlation values (c o -c 53 ) within respective correlation value groups (c o -c 8 , c 9 -c 17 , c 18 -c 26 , c 27 -c 35 , c 36 -c 44 , c 45 -c 53 ) have the same value. The register cells (a o -a 53 ) of the register means are arranged in groups (a o -a 8 , a 9 -a 17 , a 18 -a 26 , a 27 -a 35 , a 36 -a 44 , a 45 -a 53 ) corresponding to the correlation value groups (c o -c 8 , c 9 -c 17 , c 18 -c 26 , c 27 -c 35 , c 36 -c 44 , c 45 -c 53 ) of the correlation word. The correlator comprises outputs from the register means (2') for outputting the contents from the register cells (a o , a 9 , a 18 , a 27 , a 36 , a 45 and a 54 ) which, by a clock pulse, receive signal values from a preceding register cell group (a o , a 9 , a 18 , a 27 , a 36 , a 45 and a 54 ), and a calculating device (7, 8, 9; 13, 15, 17, 18) in which the current correlation (11) is determined on the basis of a correlation calculated for the former clock period and corrected by a value which depends on the signal values output from the register cells (a o , a 9 , a 18 , a 27 , a 36 , a 45 and a 54 ) combined with predetermined weight factors associated with respective register cells (a o , a 9 , a 18 , a 27 , a 36 , a 45 and a 54 ) from which the signal values are output.

Inventors

• 👤 Izydor Sokoler

Bibliographic Details