Patent ID: 6263013
Filing Date: 2001-07-17
Classification: H04L

Abstract:
A method for synchronizing a receiver PN (pseudo noise) sequence of a direct sequence spread spectrum communication receiver with a received PN sequence in a received data stream, wherein the received PN sequence comprises a repeated predetermined series of PN chips, wherein the receiver PN sequence comprises the repeated predetermined series of PN chips, wherein each PN chip in the repeated predetermined series of PN chips persists for a predetermined PN chip duration Tc, wherein the received PN sequence has a received PN phase, wherein the receiver PN sequence has a receiver PN phase, wherein the data stream comprises a series of data frames, wherein the frames comprise a plurality of symbols, wherein the frames are received at substantially regular intervals, and wherein each frame in the series of frames includes a SYNC field at a predetermined location in the frame, the method comprising:performing an acquisition of the receiver PN phase, wherein said performing the acquisition comprises:setting the receiver PN phase so that the receiver PN sequence is synchronized with the received PN sequence; andconfirming the receiver PN phase after said setting the receiver PN phase, wherein said confirming the receiver PN phase comprises the receiver identifying one or more SYNC fields in the data stream; andperforming a fast tracking to finely synchronize the receiver PN sequence with the received PN sequence after said performing the acquisition.