Cyclostationary signal detection in the angular domain for communication systems

An apparatus, comprising:

• at least one processor;
• and
• at least one memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to:
• receive input samples of a signal having expected predetermined properties;
• transform the input samples to angular form and obtaining data samples corresponding to at least one angle vector;
• perform 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 data samples of the at least one angle vector for a non-uniform distribution, the non-uniform distribution of the data samples vectors 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.

A computer program product comprising a program code stored in a non-transitory computer readable medium, configured to cause an apparatus comprising at least one processor and at least one memory to at least perform:

• 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;
• and
• 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 data samples of the at least one angle vector for a non-uniform distribution, the non-uniform distribution of the data samples 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.