Nokia Corporation

Nokia Technologies Oy

Vesa Turunen

Marko Kosunen

In accordance with an example embodiment of the present invention the application discloses a method and an apparatus to receive a signal () in a radio device on a radio channel; calculate a plurality of cyclic autocorrelations () for the received signal (), wherein calculating the plurality of cyclic autocorrelations comprises selecting a cyclic frequency () and at least two delay values () corresponding to the plurality of cyclic autocorrelations (); to compensate a phase offset of at least one of the plurality of cyclic autocorrelations (') by at least one compensation term () to obtain a plurality of phase compensated autocorrelations (), wherein the compensation term () is dependent on the cyclic frequency () and a corresponding delay value of the at least two delay values; and to combine the plurality of phase compensated autocorrelations.

Method and apparatus for spectrum sensing

Apparatuses and methods for providing efficient spectrum sensing and signal detection using cyclostationary based spectrum sensing algorithms. A method embodiment is provided, comprising: receiving input samples of a signal having expected predetermined properties; transforming the input samples to angular form and obtaining data samples corresponding to at least one angle vector; performing a cyclostationarity test on the at least one angle vector, the cyclostationarity test being done entirely in an angular domain; wherein the cyclostationarity test comprises testing the at least one angle vector for a non-uniform distribution, the non-uniform distribution of the at least one angle vector indicating cyclostationarity in the input samples; and where cyclostationarity in the input samples is determined, refraining from transmitting radio frequency signals over an air interface at a frequency corresponding to the received signal. Apparatuses for implementing the methods are also disclosed.

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Espoo, Finland

Vesa Turunen