Relay-Assisted Cross-Channel Gain Estimation for Spectrum Sharing

Guodong Zhao, Bijia Huang, Liying Li, Xiangwei Zhou

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


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.

Original languageEnglish
Article number7378920
Pages (from-to)973-986
Number of pages14
JournalIEEE Transactions on Communications
Issue number3
Publication statusPublished - 1 Mar 2016
Externally publishedYes


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