Detecting preambles of data packets
AssigneeAgilent Technologies, Inc.
InventorAlistair Mill
Life of this patent
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Abstract
Fast detection of a selected portion of a data packet (e.g. the preamble of a Bluetooth data packet) is accomplished by defining a reference signal waveform conforming to an expected waveform representing a signal modulated in accordance with the selected portion of a data packet. A waveform representing a received data signal containing a data packet with the selected portion is derived, and the reference signal waveform is correlated with this derived waveform to produce a correlation result. This correlation result is used to identify the selected portion in the received data signal.
Claims7
A method of detecting a preamble of a data signal formatted to conform to a wireless communications standard, comprising the steps of:
- defining a reference cosine signal waveform;
- receiving a data signal containing said preamble;
- deriving a waveform representing said data signal containing said preamble;
- correlating said reference cosine signal waveform with said waveform representing said data signal containing said preamble to produce a correlation result;
- identifying said preamble in said data signal in accordance with said correlation result;
- and
- comparing a part of the data signal other than said preamble with a predetermined criterion, and confirming identification of said preamble in accordance with a result of such comparison.
An apparatus for detecting a preamble of a data signal formatted to conform to a wireless communications standard, comprising:
- a waveform generator for defining a reference cosine signal waveform;
- a receiver for receiving a data signal containing said preamble, and for deriving a waveform representing said data signal containing said preamble;
- and
- a correlator for correlating said reference cosine signal waveform with said waveform representing said data signal containing said preamble to produce a correlation result, identifying said preamble in said data signal in accordance with said correlation result, comparing a part of the data signal other than said preamble with a predetermined criterion, and confirming identification of said preamble in accordance with a result of such comparison.
Dependencies are inferred from the claim text.