A single-input multiple-output transceiver architecture to ´Blindly´ null unknown interference for block-based single-carrier transmission with an insufficient guard interval

This paper proposes a new way to realize a maximum-SINR beamformer for block-based cyclically prefixed single-carrier modulation. Here, SINR stands for `signal to interference plus noise´ ratio, at the beamformer output. This spatial beamformer will `blindly´ pass the signal-of-interest; and this beamformer will `blindly´ null any co-channel interference, any adjacent-channel interference, any out-of-system interference, and/or any spatio-temporally correlated additive noises. This proposed scheme is made possible by zero-padding an insufficient guard interval, which may be shorter than the temporally spreading channel´s order. The proposed receiver will first undergo frequency-domain equalization, to `clear´ the data of any signal-of-interest´s energy in the zero-padded guard interval, in order to facilitate the estimation of the interference and noise. This interference-and-noise estimate will then be eigen-subtracted from the signal-and-interference-and-noise dataset by the aforementioned `blind´ beamformer in the spatial dimension.