Cooperative cross-channel gain estimation for underlay spectrum sharing

Abstract

In this paper, we propose a cooperative method to estimate the cross-channel gain (CCG) between the cognitive transmitter (CT) and primary receiver (PR) for underlay spectrum sharing. This method belongs to spectrum sensing technique. In particular, we introduce multiple cognitive receivers to assist the CT to estimate the CCG. Here, we design and compare three estimators for the CT based on the CT's collected measurements. Compared with conventional non-cooperative CCG estimation method, the proposed method can improve the root mean square error by 3 dB and the successful estimation probability by 37% under a typical scenario.