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A New Combined Scheme for Fast PN Code Acquisition

This paper presents a new combined acquisition scheme, known as "fast serial search sequential estimation" which is applicable to the direct sequence spread spectrum systems with a long period pseudo noise sequences. The proposed scheme is a combination of two basic acquisition schemes which are the serial search acquisition scheme and the rapid acquisition by sequential estimation (RASE) scheme. The proposed scheme gets the advantages of both serial search and RASE schemes, while overcomes their drawbacks. For example, the mean acquisition time of the proposed scheme is reduced 100 times compared with the conventional serial search scheme for PN sequence with period of 215-1.