Maximum-likelihood frame synchronization algorithms for OFDM...

Details Maximum-likelihood frame synchronization algorithms for OFDM... Maximum-likelihood frame synchronization algorithms for OFDM...

2008-03-27

2011-10-25

Payne, David (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

Reexamination Certificate

active

08045636

ABSTRACT:
Autocorrelation algorithms are employed in systems and methods to detect preamble symbols for frame synchronization in WiMAX (Worldwide Interoperability for Microwave Access) or OFDMA (Orthogonal Frequency Division Multiple Access) systems. An ML (“Maximum Likelihood”) estimator estimates segment index and frame timing information for an ideal signal scenario. When using the ML estimator, a received time domain signal is sampled. Groups of samples are formed, and the group is further divided into a plurality of portions. Then, an autocorrelation between time domain samples of each portion results in a maximum value which indicates the start of a preamble of the time domain signal. Frame synchronization can then be performed. In other transmission scenarios, the algorithm is modified to use modified estimators of the preamble symbol location. When using the modified estimators, less than all of the portions of samples are compared to one another to find a maximum value.

REFERENCES:
patent: 5260976 (1993-11-01), Dolivo et al.
patent: 5359628 (1994-10-01), Muto
patent: 7092452 (2006-08-01), Taylor et al.
patent: 2003/0198303 (2003-10-01), Taylor et al.
patent: 2005/0249319 (2005-11-01), Suh et al.
patent: 2005/0265220 (2005-12-01), Erlich et al.
patent: 2006/0133526 (2006-06-01), Zhang et al.
patent: 2006/0182193 (2006-08-01), Monsen
patent: 2006/0215538 (2006-09-01), Murthy et al.
patent: 2006/0245349 (2006-11-01), Vrcelj et al.
patent: 2007/0140366 (2007-06-01), Rore
patent: 2007/0217524 (2007-09-01), Wang et al.

Affiliated with

Also associated with

Rating

Maximum-likelihood frame synchronization algorithms for OFDM... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Maximum-likelihood frame synchronization algorithms for OFDM..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Maximum-likelihood frame synchronization algorithms for OFDM... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4273395