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 in sufficient 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.