The effect of secondary user locations on the cooperative detection performance

In conventional cooperative detection, a fusion center decides on the presence or absence of the primary user by gathering all the information from secondary users and conveys this decision to all users. This approach does not take into account the locations of the secondary users, where a user far from the primary user may also have to keep silent. In a recent work, there has been a new detection method based on combining received signals from more than two users, obtaining decision tables, and deciding individually for each user. While the proposed method showed promising results for the secondary users, the effect of the user distribution was not investigated. In this study, we consider the effect of secondary user location and number on the detection performance. We show that (i) the evaluation of the conventional method in the proposed method is not accurate, and (ii) depending on the user location the detection performance may be better or worse compared to the conventional detection.