Importance

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Abstract

A receiver of digital information typically performs a frame synchronization finction to locate the beginning of a frame of within received information. Frame and interleaver synchronization functions are complex tasks to accomplish, and are made more so when transmitted information is subjected to harsh interference by the environment of the transmission media, e.g., wireless media. Such interference may be sufficiently minimized by filtering the band signal at the receiver in a simple manner to allow receiver processes to perform successfully frame synchronization and interleaver functions on the filtered signal, in which such filtering may be achieved using a simple bandpass filter. Although such filtering renders the received signal sufficiently clean to recover frame synchronization and interleaver signals, it nevertheless corrupts the information carried in the signal, thereby making it extremely difficult to recover the information. This problem is overcome by shifting the unfiltered received signal in the way used to shift the filtered signal to locate the beginning of a frame and thus recover the underlying information.

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First Claim