Document Type
Article
Publication Date
3-1-2016
Abstract
In cognitive radio networks, the cross-channel gain from a cognitive transmitter (CT) to a primary receiver (PR) is critical for spectrum sharing and obtaining the cross-channel gain is very difficult. Even though proactive estimation allows the CT to autonomously estimate the cross-channel gain, it may cause severe interference to the PR. This raises a new issue for spectrum sensing, called spectrum sensing interference. In this paper, we deal with the sensing interference and propose a relay-assisted method to conduct the proactive estimation, which obtains the cross-channel gain with much less interference to the PR. In our method, we let the CT act as a full-duplex amplify-and-forward relay to probe the close-loop power control between primary transceivers. By measuring the power adjustment of the primary signal, the CT estimates the cross-channel gain. Simulation results indicate that our method can reduce the sensing interference to an extremely low level.
Publication Source (Journal or Book title)
IEEE Transactions on Communications
First Page
973
Last Page
986
Recommended Citation
Zhao, G., Huang, B., Li, L., & Zhou, X. (2016). Relay-Assisted Cross-Channel Gain Estimation for Spectrum Sharing. IEEE Transactions on Communications, 64 (3), 973-986. https://doi.org/10.1109/TCOMM.2016.2517160