Please use this identifier to cite or link to this item: http://localhost/handle/Hannan/201846
Title: Achievable Rates of UAV-Relayed Cooperative Cognitive Radio MIMO Systems
Authors: Lokman Sboui;Hakim Ghazzai;Zouheir Rezki;Mohamed-Slim Alouini
Year: 2017
Publisher: IEEE
Abstract: We study the achievable rate of an uplink MIMO cognitive radio system where the primary user (PU) and the secondary user (SU) aim to communicate to the closest primary base station (BS) via a multi-access channel through the same unmanned aerial vehicle (UAV) relay. The SU message is then forwarded from the primary BS to the secondary network with a certain incentive reward as a part of the cooperation protocol between both the networks. A special linear precoding scheme is proposed to enable the SU to exploit the PU free eigenmodes. We analyze two scenarios in which the UAV relay gain matrix is either fixed or optimized. We derive the optimal power allocation that maximizes the achievable rate of the SU respecting power budget, interference, and relay power constraints. Numerical results highlight the cognitive rate gain of our proposed scheme with respect to various problem parameters. We also highlight the effect of UAV altitude on the SU and PU rates. Finally, when the relay matrix is optimized, we show that the PU rate is remarkably enhanced and that the SU rate is only improved at high-power regime.
Description: 
URI: http://localhost/handle/Hannan/201846
volume: 5
More Information: 5190,
5204
Appears in Collections:2017

Files in This Item:
File SizeFormat 
7904625.pdf8.36 MBAdobe PDF
Title: Achievable Rates of UAV-Relayed Cooperative Cognitive Radio MIMO Systems
Authors: Lokman Sboui;Hakim Ghazzai;Zouheir Rezki;Mohamed-Slim Alouini
Year: 2017
Publisher: IEEE
Abstract: We study the achievable rate of an uplink MIMO cognitive radio system where the primary user (PU) and the secondary user (SU) aim to communicate to the closest primary base station (BS) via a multi-access channel through the same unmanned aerial vehicle (UAV) relay. The SU message is then forwarded from the primary BS to the secondary network with a certain incentive reward as a part of the cooperation protocol between both the networks. A special linear precoding scheme is proposed to enable the SU to exploit the PU free eigenmodes. We analyze two scenarios in which the UAV relay gain matrix is either fixed or optimized. We derive the optimal power allocation that maximizes the achievable rate of the SU respecting power budget, interference, and relay power constraints. Numerical results highlight the cognitive rate gain of our proposed scheme with respect to various problem parameters. We also highlight the effect of UAV altitude on the SU and PU rates. Finally, when the relay matrix is optimized, we show that the PU rate is remarkably enhanced and that the SU rate is only improved at high-power regime.
Description: 
URI: http://localhost/handle/Hannan/201846
volume: 5
More Information: 5190,
5204
Appears in Collections:2017

Files in This Item:
File SizeFormat 
7904625.pdf8.36 MBAdobe PDF
Title: Achievable Rates of UAV-Relayed Cooperative Cognitive Radio MIMO Systems
Authors: Lokman Sboui;Hakim Ghazzai;Zouheir Rezki;Mohamed-Slim Alouini
Year: 2017
Publisher: IEEE
Abstract: We study the achievable rate of an uplink MIMO cognitive radio system where the primary user (PU) and the secondary user (SU) aim to communicate to the closest primary base station (BS) via a multi-access channel through the same unmanned aerial vehicle (UAV) relay. The SU message is then forwarded from the primary BS to the secondary network with a certain incentive reward as a part of the cooperation protocol between both the networks. A special linear precoding scheme is proposed to enable the SU to exploit the PU free eigenmodes. We analyze two scenarios in which the UAV relay gain matrix is either fixed or optimized. We derive the optimal power allocation that maximizes the achievable rate of the SU respecting power budget, interference, and relay power constraints. Numerical results highlight the cognitive rate gain of our proposed scheme with respect to various problem parameters. We also highlight the effect of UAV altitude on the SU and PU rates. Finally, when the relay matrix is optimized, we show that the PU rate is remarkably enhanced and that the SU rate is only improved at high-power regime.
Description: 
URI: http://localhost/handle/Hannan/201846
volume: 5
More Information: 5190,
5204
Appears in Collections:2017

Files in This Item:
File SizeFormat 
7904625.pdf8.36 MBAdobe PDF