Blind beamforming for suppression of instantaneously narrowband signals in DS/SS communications using subspace projection techniques
Yimin Daniel Zhang, Moeness G. Amin · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2000
This paper proposes a novel blind beamforming method for interference mitigation in direct-sequence spread-spectrum (DS/SS) communications based on subspace projection. Instantaneously narrowband interference signals are considered. The interference signals are highly localized in the time-frequency domain, and their characteristics are different from those of the DS/SS signal. The instantaneous frequencies of the nonstationary interference signals are estimated from the time-frequency domain and used in the temporal domain for interference nulling. We derive the receiver SNRs, which shows improved performance in strong interference environments.