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Proactive Cross-Channel Gain Estimation for Spectrum Sharing in Cognitive Radio
- Source :
- IEEE Journal on Selected Areas in Communications. 34:2776-2790
- Publication Year :
- 2016
- Publisher :
- Institute of Electrical and Electronics Engineers (IEEE), 2016.
-
Abstract
- In an underlay cognitive radio network, the cross-channel gain from a cognitive transmitter (CT) to a primary receiver (PR) is crucial for spectrum sharing. By exploiting the relaying capability of the CT, we propose a proactive estimation scheme for the cross-channel gain. Specifically, the CT proactively acts as a full-duplex amplify-and-forward (AF) relay for primary transceivers to trigger the power adaption of a primary transmitter (PT). By carefully designing the relay signal, the CT is able to obtain an estimation of the cross-channel gain by observing the power adaption. To demonstrate the accuracy of the estimation, we analytically characterize both an upper bound and a lower bound of the estimation performance. Furthermore, we study the impact of CT’s relaying on the primary transmission and observe that the impact is related to the CT’s location. By introducing a factor $\phi~(0\leq \phi \leq 1)$ to denote the probability that the CT’s relaying improves the primary transmission instead of causes interference, we design the CT location as a function of $\phi $ . Numerical results show that the estimation error of the proactive estimation scheme can be as small as 1.7% with success estimation probability around 91%. By comparing with the state of the art, we show the advantages of the proposed estimator.
- Subjects :
- 021103 operations research
Computer Networks and Communications
business.industry
Computer science
Transmitter
0211 other engineering and technologies
Estimator
020206 networking & telecommunications
Jamming
02 engineering and technology
Communications system
Upper and lower bounds
law.invention
Cognitive radio
Transmission (telecommunications)
Relay
law
Computer Science::Networking and Internet Architecture
0202 electrical engineering, electronic engineering, information engineering
Electrical and Electronic Engineering
Spectrum sharing
Telecommunications
business
Algorithm
Computer Science::Information Theory
Subjects
Details
- ISSN :
- 07338716
- Volume :
- 34
- Database :
- OpenAIRE
- Journal :
- IEEE Journal on Selected Areas in Communications
- Accession number :
- edsair.doi...........e9fd3940606c8ccb7e2ca4e9a8a77d75