Transmitter-receiver cooperative sensing in MIMO cognitive network with limited feedback

Abstract

In this paper, we proposed a novel sensing scheme so-called Transmitter-Receiver Cooperative Sensing in a MIMO cognitive network by combining sensing information of both sides. Compared with most of the existing sensing schemes which simply use listen-before talk (LBT) only at the transmitter side, the proposed scheme can further improve the system performance by jointly feedback the Channel State Information (CSI) and the Sensing information (SI) from the receiver. However, the quantization impact on the sensing performance and the channel capacity as well as the interference to primary network should be considered in the case of limited feedback. Here a tradeoff criterion is proposed to allocate bits for CSI and SI so as to maximize the MIMO link capacity while meeting the interference constraints. Simulation results are given to verify the effectiveness of the proposed scheme.