Spatial Transmission Optimization for Secondary Users in Next-Gen Directional Networks
Concurrent transmission of the opportunistic Secondary User (SU) and the licensed Primary User (PU) is a promising approach to increasing secondary network capacity in Cognitive Radio (CR) networks. In future telecommunication generations, PU can be expected to adopt directional transmission. This a...
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2024-01-01
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| Online Access: | https://ieeexplore.ieee.org/document/10802914/ |
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| author | Zeinab Kteish Jad Abou Chaaya Abbass Nasser Koffi-Clement Yao Ali Mansour |
| author_facet | Zeinab Kteish Jad Abou Chaaya Abbass Nasser Koffi-Clement Yao Ali Mansour |
| author_sort | Zeinab Kteish |
| collection | DOAJ |
| description | Concurrent transmission of the opportunistic Secondary User (SU) and the licensed Primary User (PU) is a promising approach to increasing secondary network capacity in Cognitive Radio (CR) networks. In future telecommunication generations, PU can be expected to adopt directional transmission. This allows SU to exploit the spatial dimension in addition to the time-frequency dimensions, as in classical CR. However, sensing the beam of the PU and optimizing the transmission parameters of SU become crucial in this scenario to avoid interference between the SU and PU. In this paper, we propose a concurrent transmission strategy, where SU independently and passively senses the position and beamwidth of PU. Once the PU’s beam is detected, SU becomes allowed to direct its transmit power in the unoccupied space, leading to improved spectrum efficiency of the CR network. The proposed strategy aims to optimize the transmission power directed toward the secondary receiver so that the interference coming from the secondary lobes does not exceed an interference threshold. Given the role of transmit power and the number of antenna elements in determining the transmission characteristics of the SU, we formulate the allowed transmission power that respects tolerable interference to the PU. Additionally, we investigate the number of antenna elements at the SU by developing a non-convex optimization problem and proposing a method to address it. Finally, we formulate the capacity of the SU network and compare it to the traditional opportunistic CR approach. Numerical results investigate the functionality of the proposed strategy in relation to the primary network transmission conditions and potential errors in estimating these conditions. Simulation results demonstrate a significant capacity increase compared to conventional CR, where SUs only transmit during channel idle periods. |
| format | Article |
| id | doaj-art-2fceb920968f481ca0e7d6713dd0453f |
| institution | Kabale University |
| issn | 2169-3536 |
| language | English |
| publishDate | 2024-01-01 |
| publisher | IEEE |
| record_format | Article |
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| spelling | doaj-art-2fceb920968f481ca0e7d6713dd0453f2025-01-16T00:01:20ZengIEEEIEEE Access2169-35362024-01-011219713719715010.1109/ACCESS.2024.351821110802914Spatial Transmission Optimization for Secondary Users in Next-Gen Directional NetworksZeinab Kteish0https://orcid.org/0000-0001-7132-7690Jad Abou Chaaya1https://orcid.org/0000-0002-1884-1321Abbass Nasser2https://orcid.org/0000-0002-7768-8953Koffi-Clement Yao3https://orcid.org/0000-0001-8052-4274Ali Mansour4https://orcid.org/0000-0003-4144-8832Lab-STICC, UMR CNRS 6285, Université de Bretagne Occidentale, Brest, FranceLab-STICC, UMR CNRS 6285, ENIB Brest, Plouzané, FranceBusiness Computing Department, Holy-Spirit University of Kaslik (USEK), Jounieh, LebanonLab-STICC, UMR CNRS 6285, Université de Bretagne Occidentale, Brest, FranceLab-STICC, UMR CNRS 6285, ENSTA Bretagne, Brest, FranceConcurrent transmission of the opportunistic Secondary User (SU) and the licensed Primary User (PU) is a promising approach to increasing secondary network capacity in Cognitive Radio (CR) networks. In future telecommunication generations, PU can be expected to adopt directional transmission. This allows SU to exploit the spatial dimension in addition to the time-frequency dimensions, as in classical CR. However, sensing the beam of the PU and optimizing the transmission parameters of SU become crucial in this scenario to avoid interference between the SU and PU. In this paper, we propose a concurrent transmission strategy, where SU independently and passively senses the position and beamwidth of PU. Once the PU’s beam is detected, SU becomes allowed to direct its transmit power in the unoccupied space, leading to improved spectrum efficiency of the CR network. The proposed strategy aims to optimize the transmission power directed toward the secondary receiver so that the interference coming from the secondary lobes does not exceed an interference threshold. Given the role of transmit power and the number of antenna elements in determining the transmission characteristics of the SU, we formulate the allowed transmission power that respects tolerable interference to the PU. Additionally, we investigate the number of antenna elements at the SU by developing a non-convex optimization problem and proposing a method to address it. Finally, we formulate the capacity of the SU network and compare it to the traditional opportunistic CR approach. Numerical results investigate the functionality of the proposed strategy in relation to the primary network transmission conditions and potential errors in estimating these conditions. Simulation results demonstrate a significant capacity increase compared to conventional CR, where SUs only transmit during channel idle periods.https://ieeexplore.ieee.org/document/10802914/Beamformingbeamwidth characterizationcapacity enhancementconcurrent transmissionpower and array optimization |
| spellingShingle | Zeinab Kteish Jad Abou Chaaya Abbass Nasser Koffi-Clement Yao Ali Mansour Spatial Transmission Optimization for Secondary Users in Next-Gen Directional Networks IEEE Access Beamforming beamwidth characterization capacity enhancement concurrent transmission power and array optimization |
| title | Spatial Transmission Optimization for Secondary Users in Next-Gen Directional Networks |
| title_full | Spatial Transmission Optimization for Secondary Users in Next-Gen Directional Networks |
| title_fullStr | Spatial Transmission Optimization for Secondary Users in Next-Gen Directional Networks |
| title_full_unstemmed | Spatial Transmission Optimization for Secondary Users in Next-Gen Directional Networks |
| title_short | Spatial Transmission Optimization for Secondary Users in Next-Gen Directional Networks |
| title_sort | spatial transmission optimization for secondary users in next gen directional networks |
| topic | Beamforming beamwidth characterization capacity enhancement concurrent transmission power and array optimization |
| url | https://ieeexplore.ieee.org/document/10802914/ |
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