Abstract
This paper compares three different interference suppression methods when the receiver is equipped with an antenna array. The first one is the spatial minimum variance distortionless response (MVDR) beamforming. The second structure is the combination of the spatial MVDR beamforming and the frequency domain forward consecutive mean excision (FCME) interference suppressor. The third strategy is the space-time MVDR beamformer. The purpose is to investigate the advantages of these interference suppressor structures already during the initial code synchronization process. The results show that all the investigated methods are capable of eliminating all investigated interference types if the angle separation between desired and interfering signal is few degrees, i.e., interfering signal arrives outside from the mainlobe. If the interfering signal arrives from the mainlobe then the best performance is achieved using the space-time MVDR beamforming. However, the space-time processing has the largest computational complexity and therefore the spatial beamforming is favorable. The results show also that the use of the FCME algorithm after the spatial beamforming gives additional performance gain if compared to the situation where it is not utilized.
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