The present invention relates to a technique for rapidly obtaining a PN (pseudonoise) sequence suitable for direct sequence spread spectrum (direct sequence spread spectrum) systems. ; Technique proposed in this invention is confirmed as to estimate the chip values by writing new decision rules as to the reliability of the chip estimates. Using this technique reduces the average number of chips required for the ever gyeonjueo techniques and code acquisition, it is clearly a good performance when the signal-to-noise ratio is not too high or low. ; Direct sequence spread spectrum, pseudo-noise sequence, code acquisition, sequential estimation.
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