Frame synchronization of an OFDM signal

Details Frame synchronization of an OFDM signal Frame synchronization of an OFDM signal

2005-08-09

2005-08-09

Pham, Chi (Department: 2666)

Multiplex communications

Generalized orthogonal or special mathematical techniques

C375S260000, C375S316000, C381S003000

Reexamination Certificate

active

06928046

ABSTRACT:
Frame synchronization of a received OFDM signal (such as that used in a hybrid FM DAB system) is provided by filtering out significant outer frequency portions of the digital channels, and then using cyclic extension and correlation of the cyclically extended bits (or samples). The received OFDM signal is passed through a bandpass filter to remove outer digital subcarriers (i.e., those farthest from a center frequency) from a received OFDM signal before correlating to locate the OFDM frame boundaries. By filtering out digital subcarriers within each of the digital channels, particularly those closest to adjacent channels and thus most likely to be interfered with by an adjacent first channel OFDM (or FM) signal, correlation between cyclically extended bit (or sample) patterns and thus frame synchronization of OFDM signals can be improved significantly.

REFERENCES:
patent: 5652772 (1997-07-01), Isaksson et al.
patent: 5745525 (1998-04-01), Hunsinger et al.
patent: 6160791 (2000-12-01), Bohnke
patent: 6188717 (2001-02-01), Kaiser et al.
patent: 6313738 (2001-11-01), Wynn
patent: 6341140 (2002-01-01), Lee et al.

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