Signal detector, signal detection method, and communication terminal apparatus

摘要

There is provided a signal detector which includes a correlation emphasis unit configured to generate correlation emphasis signals corresponding to the respective fixed intervals, an autocorrelation matrix generation unit configured to generate an autocorrelation matrix, a noise power estimation unit configured to estimate noise power in the correlation emphasis signals, a noise power matrix generation unit configured to generate, a noise power matrix having noise power components, a noise removal unit configured to remove an influence of noise from the autocorrelation matrix, an eigenvalue calculation unit configured to calculate an eigenvalue of the autocorrelation matrix from which the influence of noise has been removed by the noise removal unit, and a signal judgment unit configured to determine whether a signal transmitted from an external apparatus is included in the received signals.

主权项

1. A signal detection method, comprising:
generating, based on received signals given at fixed intervals and the signals partially overlapping in the fixed intervals, correlation emphasis signals corresponding to the respective intervals; estimating noise power included in the correlation emphasis signals of the received signals; generating, based on a first autocorrelation matrix of the correlation emphasis signals and the estimated noise power, a noise power matrix representing noise components included in the first autocorrelation matrix; removing, based on the first autocorrelation matrix and the noise power matrix, an influence of noise from the first autocorrelation matrix, resulting in a second autocorrelation matrix; calculating a plurality of eigenvalues of the second autocorrelation matrix; and determining, based on the calculated plurality of eigenvalues, whether a signal transmitted from an external apparatus is included in the received signals.