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US 6,785,349 B1Granted
Correlation based method of determining frame boundaries of data frames that are periodically extended
Assignee3Com Corporation
InventorsJohn R. Rosenlof, Kevin J. Smart, John B. Dougall, Jr.
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Abstract
A correlator for use in a timing recovery apparatus of a receiver in a multicarrier transmission system. The correlator locates the beginning of a data frame and initializes a pointer register with an address to a location within the receive signal buffer. Data is transferred to a signal converter from the receive signal buffer where the samples that are fed into the converter are determined by the address stored in the pointer register.
Claims8
A method of determining a symbol frame boundary in a multicarrier data signal, comprising the steps of:
- forming a sample sequence from a received multicarrier signal;
- calculating a difference sequence from the sample sequence;
- forming a multiplicative estimate sequence from selected points within the difference sequence;
- forming a sliding window sequence by summing selected points within the multiplicative estimate sequence;
- locating a maximum value of the sliding window sequence;
- and,
- loading a pointer register based on a sequence index corresponding to the maximum value.
4 more elements
Dependencies are inferred from the claim text.