Correlation-based detection in a cognitive radio system
First Claim
1. A method comprising:
- sensing a plurality of wireless signals received at a receiver;
estimating cyclic correlation of the received signals using a multi-variate sign function;
determining from the estimated cyclic correlation which ones of the signals are detected based on cyclostationarity present at known cyclic frequencies; and
based on the frequencies over which were received the detected signals, selecting a frequency resource for opportunistic communications.
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Abstract
A user equipment senses a plurality of wireless signals it receives; estimates cyclic correlation of the received signals using a multi-variate sign function; determines from the estimated cyclic correlation which ones of the signals are detected based on cyclostationarity present at known cyclic frequencies; and a frequency resource is selected for opportunistic communications based on the frequencies over which were received the signals that were determined to be detected. In specific embodiments, the multi-variate sign function is bivariate; the detected signals are primary user signals and the selected frequency resource avoids frequencies on which they were received; and/or the detected signals are secondary user signals and the selected frequency resource can either avoid those frequencies on which they were received or use those frequencies for the UE'"'"'s own opportunistic communications.
33 Citations
18 Claims
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1. A method comprising:
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sensing a plurality of wireless signals received at a receiver; estimating cyclic correlation of the received signals using a multi-variate sign function; determining from the estimated cyclic correlation which ones of the signals are detected based on cyclostationarity present at known cyclic frequencies; and based on the frequencies over which were received the detected signals, selecting a frequency resource for opportunistic communications. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus comprising:
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a receiver configured to sense a plurality of wireless signals; a detector configured to estimate cyclic correlation of the received signals using a multi-variate sign function, and to determine from the estimated cyclic correlation which ones of the signals are detected based on cyclostationarity present at known cyclic frequencies; and a processor configured to select a frequency resource for opportunistic communications based on the frequencies over which were received the signals that the detector determined are detected. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A computer readable memory storing a program of computer executable instructions that when executed by a processor result in actions comprising:
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sensing a plurality of wireless signals; estimating cyclic correlation of the received signals using a multi-variate sign function; determining from the estimated cyclic correlation which ones of the signals are detected based on cyclostationarity present at known cyclic frequencies; and based on the frequencies over which were received the detected signals, selecting a frequency resource for opportunistic communications.
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18. An apparatus comprising:
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receiving means for sensing a plurality of wireless signals; detecting means for estimating cyclic correlation of the sensed signals using a multi-variate sign function, and for determining from the estimated cyclic correlation which ones of the signals are detected based on cyclostationarity present at known cyclic frequencies; and selecting means for selecting a frequency resource for opportunistic communications based on the frequencies over which were received the signals that the detector determined are detected.
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Specification