1. A method of determining as to whether a received signal includes an information signal, the method comprising: determining a covariance matrix from a received signal; transforming the covariance matrix into a transformed covariance matrix, wherein the transformation is configured such that the transformed covariance matrix is a non-diagonal matrix in case the received signal includes the information signal, wherein the non-diagonal matrix comprises non-zero non-diagonal matrix elements; determining a first function using at least one of the non-zero non-diagonal matrix elements of the transformed covariance matrix; determining a second function using at least one matrix element of the transformed covariance matrix, wherein the second function is different from the first function; and determining as to whether a received signal includes an information signal based on a comparison of a value of the first function and a value of the second function.