A digital processing unit for use in a spread spectrum signal receiver, the digital processing unit being adapted to receive an incoming stream of data samples and in response thereto produce a decoded signal, the digital processing unit comprising a correlation module adapted to correlate data blocks formed from the incoming stream of data samples with a local code replica segment to produce a first number of intermediate accumulation results and an aggregation module adapted to receive the first number of intermediate accumulation results and to combine the first number of consecutive ones of said intermediate accumulation results to form a target number of aggregated accumulation results, said target number being less than or equal to the first number.