A method and a device for the reception of radio signals, particulary digital, multi-carrier signals

摘要

Reception of radio signals, particularly C-OFDM signals, affected by degradation due to echoes or multiple paths, is improved by an apparatus where the signal is received through an antenna system that may be directed by electrical control; the quality of the signal received is evaluated by analyzing the spectral energy distribution of the signal in at least three frequency bands of the signal and determining the presence, position and magnitude of the energy notches in the signal spectrum, as caused by short echoes, or by measuring the error rate in the demodulated signal; and the directivity or position of the antenna system is modified whenever the signal quality departs from a predetermined parameter. <IMAGE>