In cognitive radio networks (CRNs), the transmissions of primary users (PUs) will cause interference to secondary users (SUs), consequently resulting in the less spectrum available at SUs. Instead of regarding the radio signals radiated by PUs as interference, these signals can be opportunistically harvested by SUs as energy. We name such cognitive radio networks with wireless energy harvesting technology as (WEH-CRNs). However, most of previous studies mainly consider using omni-directional antennas in WEH-CRNs (OMN-WEH-CRNs), consequently resulting in high interference. In this paper, we consider using directional antennas in WEH-CRNs (DIR-WEH-CRNs) to improve the performance of WEH-CRNs. We establish an analytical model to analyze the transmission probability of SUs in both DIR-WEH-CRNs and OMN-WEH-CRNs. Our simulation results show that our proposed model can accurately analyze the transmission probability of SUs in both DIR-WEH-CRNs and OMN-WEH-CRNs. Moreover, our results also show that the transmission probability of SUs depends on both the spectrum availability and the probability of SUs being charged. Compared with OMN-WEH-CRNs, DIR-WEH-CRNs can achieve higher transmission probability of SUs due to the reduced interference.
|Title of host publication||2017 23rd Asia-Pacific Conference on Communications : Bridging the Metropolitan and the Remote, APCC 2017|
|Publisher||Institute of Electrical and Electronics Engineers Inc.|
|Number of pages||6|
|Publication status||Published - 27 Feb 2018|
|Event||23rd Asia-Pacific Conference on Communications, APCC 2017 - Perth, Australia|
Duration: 11 Dec 2017 → 13 Dec 2017
|Name||2017 23rd Asia-Pacific Conference on Communications: Bridging the Metropolitan and the Remote, APCC 2017|
|Conference||23rd Asia-Pacific Conference on Communications, APCC 2017|
|Period||11/12/17 → 13/12/17|
Bibliographical noteFunding Information:
The work described in this paper was supported by Macao Science and Technology Development Fund under Grant No. 096/2013/A3. The authors would like to thank anonymous reviewers for their constructive comments. The authors would like to express their appreciation for Gordon K.-T. Hon for his thoughtful discussions.
© 2017 University of Western Australia.
- Cognitive radio networks
- directional antennas
- transmission probability
- wireless energy harvesting