The pseudonoise code generator which the pseudonoise code acquisition device and directly the sequence which possesses

摘要

An apparatus for acquiring a pseudo noise (PN) code and a direct-sequence code division multiple access (DS-CDMA) receiver are provided. The apparatus for acquiring a pseudo noise (PN) code includes a PN code generator for generating K PN codes, a multiplexer for multiplying a received signal by + 1 or -1 according to the value of a PN code selected to be a reference code among K PN codes and outputting the multiplication result, 2K-1 accumulators for accumulating the outputs of the multiplexer according to a predetermined control signal, a selector for outputting the control signal so that the output of the multiplexer can input to one of the accumulators according to (K-1) code values excluding the reference code, a programmable adder for adding the outputs of the accumulators to each other according to a predetermined regulation and outputting K correlation values, and a discriminator for outputting the PN code having a correlation value larger than a predetermined value among the K correlation values. It is possible to reduce the amount of operations by grouping codes during a hybrid search where K code phases are simultaneously searched by the DS-CDMA receiver and to simplify the structure of hardware. IMAGE