Frame synch detection with rate adaptation
AssigneeInfineon Technologies Americas Corp.
InventorClaudio Rey
Life of this patent
Estimating the term…
Abstract
A device includes a receiver to receive a packet over a channel at a first frequency and generate a sampled stream of data at a first sample rate corresponding to the first frequency. A data resampler circuit includes a re-timer engine to determine, using a ratio between the first sample rate and a crystal oscillator (XO)-divided sample rate, re-timer values. The data resampler circuit includes a time shifting circuit to re-sample data values of the sampled stream of data associated with locations of the plurality of re-timer values. A correlation circuit uses the re-sampled data values, and the re-timer values to match an expected data pattern to a corresponding data pattern detected in a frame of the packet.
Claims20
A wireless device comprising:
- a receiver to wirelessly receive a packet over a channel at a first frequency and generate a sampled stream of data from the packet at a first sample rate corresponding to the first frequency;
- a data resampler circuit coupled to the receiver, the data resampler circuit comprising:
- a re-timer engine to determine, using a ratio between the first sample rate and a crystal oscillator (XO)-integer-divided sample rate, a plurality of re-timer values;
- and
- a time shifting circuit to re-sample data values of the sampled stream of data associated with locations of the plurality of re-timer values;
- and
- a correlation circuit coupled to the data resampler circuit, the correlation circuit to use the re-sampled data values and the plurality of re-timer values to match an expected data pattern to a corresponding data pattern detected in a frame of the packet.
A method of operating a wireless device that comprises a receiver, a data resampler circuit coupled to the receiver, and a correlation circuit coupled to the data resampler circuit, wherein the method of operating the wireless device comprises:
- receiving wirelessly, by the receiver, a packet over a channel at a first frequency;
- generating, by the receiver, a sampled stream of data from the packet at a first sample rate corresponding to the first frequency;
- determining, by the data resampler circuit using a ratio between the first sample rate and a crystal oscillator (XO)-integer-divided sample rate, a plurality of re-timer values;
- re-sampling, by the data resampler circuit, data values of the sampled stream of data associated with locations of the plurality of re-timer values;
- and
- matching, by the correlation circuit using the re-sampled data values and the plurality of re-timer values, an expected data pattern to a corresponding data pattern detected in a frame of the packet.
A system comprising:
- a first wireless device adapted to gain access to a secured enclosure by transmitting data comprising a frame;
- and
- a second wireless device located within the secured enclosure, the second wireless device comprising:
- a receiver to wirelessly receive a packet over a channel at a first frequency and generate a sampled stream of data from the packet at a first sample rate corresponding to the first frequency;
- a data resampler circuit coupled to the receiver, the data resampler circuit comprising:
- a re-timer engine to determine, using a ratio between the first sample rate and a crystal oscillator (XO)-integer-divided sample rate, a plurality of re-timer values;
- and
- a time shifting circuit to re-sample data values of the sampled stream of data associated with locations of the plurality of re-timer values;
- and
- a correlation circuit coupled to the data resampler circuit, the correlation circuit to use the re-sampled data values and the plurality of re-timer values to match an expected data pattern to a corresponding data pattern detected in a frame of the packet.
Dependencies are inferred from the claim text.