JOINT DE-SPREADING AND FREQUENCY CORRECTION USING A CORRELATOR

A correlator ( 140 ) for de-spreading a spread-spectrum signal includes a state machine ( 205 ), a frequency look-up table ( 207 ), a pseudorandom code generator ( 209 ), and a correlator structure ( 301 and 801 ). The spread-spectrum signal includes symbols, and each symbol includes a plurality of chips. The correlator structure includes a plurality of taps ( 309 and 809 ) at which a coordinate rotation digital computer (CORDIC) operation is performed to determine an offset from a nominal carrier frequency of the spread-spectrum signal and to change a phase of each chip of a received symbol, in order to correct a carrier frequency of the spread-spectrum signal while de-spreading the spread-spectrum signal.