Cc. Fan et Zh. Tsai, SERIAL AND PARALLEL SEARCH WITH PARALLEL I-Q MATCHED-FILTER FOR PN ACQUISITION IN PCS, IEICE transactions on communications, E79B(9), 1996, pp. 1278-1286
For direct sequence spread spectrum systems, the performance of PN seq
uence acquisition can be significantly affected if data modulation is
present. However, the data modulation often exists during the reacquis
ition of a PCS radio channel. This study proposes and analyzes two sch
emes which are designed to improve acquisition process for PN sequence
under data modulation. Both designs are based upon a PN acquisition r
eceiver with parallel I-Q matched filters. The first scheme employs a
serial search strategy with verification mode. The second scheme, whic
h is still based upon the same parallel acquisition receiver, employs
the parallel search strategy. We show that the second scheme is capabl
e of providing faster acquisition under data modulation than the first
serial search scheme using the same number of I-Q matched filter. We
believe it should become a very good alternative for the acquisition o
f data modulated PN sequences in personal communications.