Transceiver with frequency error compensation
AssigneeSilicon Laboratories Inc.
InventorsHendricus de Ruijter, Ping Xiong
Life of this patent
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Abstract
A method compensates for a frequency error in a communications system. The method includes detecting a received preamble sequence in a received signal. The received preamble sequence is detected based on a plurality of power estimates corresponding to a plurality of frequency bins of a received frequency domain signal and a plurality of relative phase errors corresponding to the plurality of frequency bins of the received frequency domain signal. The method includes determining the frequency error using the received preamble sequence. The method includes adjusting the receiver based on the frequency error.
Claims20
A method for compensating for a frequency error in a communications system, the method comprising:
- detecting a received preamble sequence in a received signal, the received preamble sequence being detected based on a plurality of power estimates corresponding to a plurality of frequency bins of a received frequency domain signal, a plurality of relative phase errors corresponding to the plurality of frequency bins of the received frequency domain signal, a threshold power estimate, and a threshold relative phase error;
- determining the frequency error using the received preamble sequence;
- and
- adjusting the communications system based on the frequency error.
A method for compensating for a frequency error in a communications system, the method comprising:
- detecting a received preamble sequence in a received signal, the received preamble sequence being detected based on a plurality of power estimates corresponding to a plurality of frequency bins of a received frequency domain signal and a plurality of relative phase errors corresponding to the plurality of frequency bins of the received frequency domain signal;
- determining the frequency error using the received preamble sequence;
- and
- adjusting the communications system based on the frequency error,
- wherein the received preamble sequence includes a plurality of tones, each tone of the plurality of tones having a relative power, a relative frequency, and a relative phase, wherein the relative power of each of the tones of the plurality of tones has a predetermined relative relationship to the relative power of other tones of the plurality of tones, the relative frequency of each of the tones of the plurality of tones has a predetermined relative relationship to the relative frequency of other tones of the plurality of tones, and the relative phase of each of the tones of the plurality of tones has a predetermined relative relationship to the relative phase of other tones of the plurality of tones.
A communications system comprising:
- a receiver signal path configured to provide a digital received signal based on a received signal and a control signal generated based on a frequency error indicator;
- a fast-Fourier transform circuit configured to generate a received frequency domain signal based on the digital received signal;
- a processor configured to:
- detect a received preamble sequence in the received signal, the received preamble sequence being detected based on a plurality of power estimates corresponding to a plurality of frequency bins of the received frequency domain signal, a plurality of relative phase errors corresponding to the plurality of frequency bins of the received frequency domain signal, a threshold power estimate, and a threshold relative phase error;
- and
- generate the frequency error indicator using the received preamble sequence.
Dependencies are inferred from the claim text.