Narrowband PPM semi-'blind' spatial-rake receiver & co-channel interference suppression

Among the open-literature on pulse-position-modulation (PPM) radiowave wireless communications, this work is first to advance a semi-'blind'/'blind' spatial-rake receiver with interference-rejection capability. This proposed adaptive 'smart antennas' detector uses the signal-of-interest's (SOI) earlier decoded information-symbols to segment earlier collected data into two data-groups: one data-group with the SOI and co-channel-interference and noise, with the other data-group containing only the latter two. These two data-groups' spatial-correlation matrices' generalised-eigenvector maximises the 'blind' spatial beamformer's output signal-to-interference-and-noise ratio (SINR) without prior knowledge of (1) the multi-access user interferers' (MAUI) arrival directions, delays nor powers, (2) the signal-of-interest's (SOI) spatial signature at the receiving sensor-array‡, and (3) the mobile's receiving-antennas' nominal/actual array-geometry and gain/phase responses. This proposed scheme is semi-'blind' because it needs a pilot sequence from the SOI.