APPARATUS AND METHOD FOR TRACKING SYMBOL TIMING OF OFDM MODULATION IN A MULTI-PATH CHANNEL
First Claim
1. A wireless signal receiver to demodulate an OFDM signal having multipath components, said receiver comprising symbol timing logic to control the timing of a Fourier Transformation operation by Fast Fourier Transform (FFT) logic, wherein the symbol timing logic is to drive the Fast Fourier Transform logic to perform the Fourier Transformation operation on signal data synchronized to the first multipath component received earlier in time than a second multipath component.
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Abstract
Methods and Systems for tracking symbol timing of an OFDM signal are disclosed. In one embodiment, a wireless receiver includes signal tracking and timing logic to facilitate the timing of a demodulation operation such that the demodulation operation occurs on the proper symbol boundary, particularly when the OFDM signal has multipath components and the second component has greater power than the first.
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Citations
22 Claims
- 1. A wireless signal receiver to demodulate an OFDM signal having multipath components, said receiver comprising symbol timing logic to control the timing of a Fourier Transformation operation by Fast Fourier Transform (FFT) logic, wherein the symbol timing logic is to drive the Fast Fourier Transform logic to perform the Fourier Transformation operation on signal data synchronized to the first multipath component received earlier in time than a second multipath component.
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8. In a wireless signal receiver, a method of tracking symbol timing in a received signal having multipath components, comprising:
setting FFT timing in the receiver near a leading edge of a portion of a nonzero autocorrelation operation due to a first multipath component by shifting a result of the autocorrelation operation based on a fixed design constant. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A wireless signal receiver to demodulate an OFDM signal with our without multipath components, said receiver comprising:
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power monitoring logic to determine the average power in a predetermined number of samples from the OFDM signal; and
edge detection logic to detect rising edges of average power measured, wherein each rising edge determines the location of a multipath component, and the location of the first rising edge indicates the first received multipath component which is used to control the timing of a Fourier Transformation operation by Fast Fourier Transform (FFT) logic. - View Dependent Claims (16, 17, 18)
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19. In a wireless signal receiver, a method of tracking symbol timing in a received signal having multipath components, comprising:
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monitoring the power within a null carrier portion of the received signal to detect a first increase in power caused by a time delayed null carrier of a multipath component; and
driving a Fast Fourier Transorm (FFT) operation on the signal based on the detection of the first increase in power. - View Dependent Claims (20, 21, 22)
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Specification