| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a correlation circuit that suppresses the acquisition time of a reception signal to the minimum and also has a simple circuit configuration. <P>SOLUTION: A code register 10 stores a known pseudorandom noise (PN) code used for transmission. An input data memory 12 stores a spread spectrum signal once received. A frequency offset part 14 performs frequency conversion for each designated frequency offset concerning the spread spectrum signal stored in the input data memory. A correlation processing circuit 11 performs correlation processing between the known PN code and data which is output from the frequency offset part for each frequency offset. A peak detection circuit 13 performs the peak detection processing of a correlative value from the data where the correlation processing is performed for each frequency offset, and generates PN code initial phase information and carrier frequency deviation amount information. <P>COPYRIGHT: (C)2012,JPO&INPIT |
