Patent ID: 6275519
Filing Date: 2001-08-14
Classification: H04L

Abstract:
In a digital communications receiver, a method for synchronizing a receiver frame clock with a series of received data frames in a data stream received from a remote transmitter, wherein the data frames comprise a plurality of symbols, wherein the data frames are received at substantially regular intervals, and wherein each data frame in the series of data frames includes a SYNC field comprising a predetermined sequence of symbols, the method comprising:recovering a symbol timing;acquiring a frame timing after said recovering the symbol timing, wherein said acquiring comprises:the receiver scanning the data stream for the SYNC field only during a narrow detection window around an expected location in time of the SYNC field,the receiver identifying the SYNC field in the data stream, andthe receiver setting the frame clock in response to said identifying the SYNC field; andlocking the frame timing after said acquiring a frame timing, wherein said locking comprises the receiver using the frame clock to determine the start of each subsequent data frame in the data stream.