System and method for real-time spectrum analysis in a communication device
First Claim
1. A spectrum analysis system comprising:
- a. a Fast Fourier Transform (FFT) circuit that receives as input a digital signal representing received energy for a FFT interval in a frequency band and computes FFT values for a plurality of frequency bins; and
b. a power calculation circuit coupled to the FFT circuit that computes the power at each frequency bin for an FFT interval and outputs a power value for each frequency bin; and
c. a duty count circuit coupled to the power calculation circuit that, for an FFT interval, compares the power value for each frequency bin with a threshold and increments a count value when the power value is at or exceeds the threshold for each frequency bin.
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Abstract
A spectrum analysis engine (SAGE) that comprises a spectrum analyzer component, a signal detector component, a universal signal synchronizer component and a snapshot buffer component. The spectrum analyzer component generates data representing a real-time spectrogram of a bandwidth of radio frequency (RF) spectrum. The signal detector detects signal pulses in the frequency band and outputs pulse event information entries output, which include the start time, duration, power, center frequency and bandwidth of each detected pulse. The signal detector also provides pulse trigger outputs which may be used to enable/disable the collection of information by the spectrum analyzer and the snapshot buffer components. The snapshot buffer collects a set of raw digital signal samples useful for signal classification and other purposes. The universal signal synchronizer synchronizes to periodic signal sources, useful for instituting schemes to avoid interference with those signals.
76 Citations
18 Claims
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1. A spectrum analysis system comprising:
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a. a Fast Fourier Transform (FFT) circuit that receives as input a digital signal representing received energy for a FFT interval in a frequency band and computes FFT values for a plurality of frequency bins; and b. a power calculation circuit coupled to the FFT circuit that computes the power at each frequency bin for an FFT interval and outputs a power value for each frequency bin; and c. a duty count circuit coupled to the power calculation circuit that, for an FFT interval, compares the power value for each frequency bin with a threshold and increments a count value when the power value is at or exceeds the threshold for each frequency bin. - View Dependent Claims (2, 3, 4, 9, 10, 11, 12)
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5. A method for analyzing energy in a frequency band, comprising:
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a. receiving energy in a frequency band; b. generating a digital signal representing the received energy; c. computing a Fast Fourier Transform (FFT) from the digital signal to generate FFT values for a plurality of frequency bins for an FFT interval; d. computing the power at each frequency bin to produce a power value for each frequency bin for an FFT interval; and e. comparing the power value for each frequency bin with a threshold to increment a count value when the power value is at or exceeds the threshold for each frequency bin. - View Dependent Claims (6, 7, 8, 13, 14, 15, 16, 17, 18)
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Specification