Sequential sensing scheme for cognitive radio
AssigneeNEC Laboratories America, Inc.
InventorsYan Xin, Honghai Zhang, Sampath Rangarajan
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Abstract
A method and system for determining whether a given electromagnetic frequency is in use. An incoming signal is sampled and a test statistic is calculated based on the magnitude of the received samples and a predetermined constant. A determination is then made regarding whether the frequency is in use, based on whether the test statistic has exceeded a threshold.
Claims20
A method for determining whether a given electromagnetic frequency is in use, comprising the steps of:
- applying a transformation to an amplitude of received samples;
- adjusting the transformed samples by a constant based on a minimum detection signal-to-noise ratio;
- combining the adjusted samples to produce a test statistic;
- and
- using a processor to make a determination regarding whether the frequency is in use based on whether the test statistic has exceeded or has fallen below a threshold.
A system for determining whether a given electromagnetic frequency is in use, comprising:
- a transformation module configured to transform an amplitude of received samples;
- an adjustment module configured to adjust the transformed samples by a constant based on a minimum detection signal-to-noise ratio and to combine the adjusted samples to produce a test statistic;
- and
- a test module configured to use make a determination using a processor as to whether the frequency is in use based on whether the test statistic has exceeded or has fallen below a threshold.
A computer readable medium storing a computer readable program, wherein the computer readable program when executed on a computer causes the computer to:
- calculate a test statistic based on the magnitude of a set of received samples adjusted by a constant;
- and
- make a determination regarding whether a frequency is in use based on whether the test statistic has exceeded or has fallen below a threshold.
Dependencies are inferred from the claim text.