Method and apparatus for periodic signal detection in OFDM/DMT systems
AssigneeAfa Technologies, Inc.
InventorsTsung-Liang Chen, Jen-Wei Liang
Life of this patent
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Abstract
A method for detecting a periodic signal in a communication system. The method includes converting a time domain digitized signal to obtain a corresponding frequency domain digitized signal, quantizing at least two symbols of the frequency domain digitized signal to obtain quantization information, utilizing the quantization information to compute a detection metric for periodic signal detection, and determining that a periodic signal is detected if the detection metric is greater than a predetermined threshold.
Claims9
A method for detecting a periodic signal in a communication system, the method comprising:
- (a) converting a time domain digitized signal to obtain a corresponding frequency domain digitized signal;
- (b) quantizing at least two symbols of the frequency domain digitized signal to obtain quantization information;
- and
- (c) utilizing the quantization information to compute a detection metric for periodic signal detection.
A periodic signal detection system for an orthogonal frequency division multiplexing (OFDM) or a discrete multi-tone (DMT) communication system, the signal detection system comprising:
- a serial-to-parallel converter capable of performing serial-to-parallel conversion on an input time domain digital signal;
- a fast Fourier transform (FFT) module electrically connected to the serial-to-parallel converter for transforming the time domain digital signal to a frequency domain digital signal;
- and
- a demodulator electrically connected to the FFT module comprising:
- a periodic signal detector comprising:
- a quantizer electrically connected to the FFT module for quantizing symbols of the frequency domain digital signal of the FFT module;
- a sign correlator electrically connected to the quantizer for performing a predetermined correlation to generate a detection metric for periodic signal detection;
- and
- a sign memory electrically connected to the quantizer and the sign correlator for providing sign information obtained from the quantizer to the sign correlator;
- and
- a demodulation module for demodulating the frequency domain digital signal.
Dependencies are inferred from the claim text.