Optimal user scheduling and power control in multi-user cognitive broadcast systems

Abstract Cognitive radio systems should not only have the ability to sense and exploit “frequency spectrum holes”, but also the ability to sense and utilize “spatial spectrum holes”. In this paper, we consider the issue of maximizing the throughput of the cognitive systems by fully utilizing “spatial spectrum holes” brought in by multiple cognitive users, in the scenario where a pair of licensed users and a cognitive broadcast system share multiple spectrum bands. By exploiting the channel reciprocity under the premise that the licensed system adopts the time-division-duplexing (TDD) mode, we propose a more practical cognitive access scheme that can sense the interference at the licensed user caused by the cognitive transmitter, based on the existing feedback signals from the licensed user to the licensed base station. Taking both interferences from the licensed base station to the cognitive receiver and from the cognitive transmitter to the licensed user into consideration, we investigate the optimal user scheduling and power allocation scheme that can maximize the ergodic sum rate of the cognitive system. We show that scheduling the user whose channel gain to interference and noise ratio (CGINR) is the largest for each frequency band is optimal. We also derive the dynamic power allocation scheme meeting the three practical constraints, i.e., the transmitter’s average transmission power constraint, the power amplifier’s instantaneous transmission power constraint, and the interference power constraint at the licensed user. The result shows that in different coherent time intervals and different frequency bands, the power allocation has a multi-level waterfilling structure. Theoretical analysis shows that the strategy scheduling user with the largest CGINR introduces significant performance improvement compared with the traditional strategy scheduling user with the largest channel gain to noise ratio (CGNR). We also illustrate the impact of power constraints and the number of users on system performance by simulation. Ausführliche Beschreibung

Gespeichert in:

Autor*in:	Wang, QunHuan [verfasserIn] Wang, HuiMing [verfasserIn] Yin, QinYe [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2012

Schlagwörter:	cognitive radio distributed spatial spectrum holes opportunistic scheduling power allocation

Übergeordnetes Werk:	Enthalten in: Science in China - Heidelberg : Springer, 2001, 55(2012), 6 vom: 24. Feb., Seite 1402-1414
Übergeordnetes Werk:	volume:55 ; year:2012 ; number:6 ; day:24 ; month:02 ; pages:1402-1414

Links:	Volltext

DOI / URN:	10.1007/s11432-012-4562-2

Katalog-ID:	SPR019308833

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520			\|a Abstract Cognitive radio systems should not only have the ability to sense and exploit “frequency spectrum holes”, but also the ability to sense and utilize “spatial spectrum holes”. In this paper, we consider the issue of maximizing the throughput of the cognitive systems by fully utilizing “spatial spectrum holes” brought in by multiple cognitive users, in the scenario where a pair of licensed users and a cognitive broadcast system share multiple spectrum bands. By exploiting the channel reciprocity under the premise that the licensed system adopts the time-division-duplexing (TDD) mode, we propose a more practical cognitive access scheme that can sense the interference at the licensed user caused by the cognitive transmitter, based on the existing feedback signals from the licensed user to the licensed base station. Taking both interferences from the licensed base station to the cognitive receiver and from the cognitive transmitter to the licensed user into consideration, we investigate the optimal user scheduling and power allocation scheme that can maximize the ergodic sum rate of the cognitive system. We show that scheduling the user whose channel gain to interference and noise ratio (CGINR) is the largest for each frequency band is optimal. We also derive the dynamic power allocation scheme meeting the three practical constraints, i.e., the transmitter’s average transmission power constraint, the power amplifier’s instantaneous transmission power constraint, and the interference power constraint at the licensed user. The result shows that in different coherent time intervals and different frequency bands, the power allocation has a multi-level waterfilling structure. Theoretical analysis shows that the strategy scheduling user with the largest CGINR introduces significant performance improvement compared with the traditional strategy scheduling user with the largest channel gain to noise ratio (CGNR). We also illustrate the impact of power constraints and the number of users on system performance by simulation.
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allfields	10.1007/s11432-012-4562-2 doi (DE-627)SPR019308833 (SPR)s11432-012-4562-2-e DE-627 ger DE-627 rakwb eng 070 004 ASE 54.00 bkl Wang, QunHuan verfasserin aut Optimal user scheduling and power control in multi-user cognitive broadcast systems 2012 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract Cognitive radio systems should not only have the ability to sense and exploit “frequency spectrum holes”, but also the ability to sense and utilize “spatial spectrum holes”. In this paper, we consider the issue of maximizing the throughput of the cognitive systems by fully utilizing “spatial spectrum holes” brought in by multiple cognitive users, in the scenario where a pair of licensed users and a cognitive broadcast system share multiple spectrum bands. By exploiting the channel reciprocity under the premise that the licensed system adopts the time-division-duplexing (TDD) mode, we propose a more practical cognitive access scheme that can sense the interference at the licensed user caused by the cognitive transmitter, based on the existing feedback signals from the licensed user to the licensed base station. Taking both interferences from the licensed base station to the cognitive receiver and from the cognitive transmitter to the licensed user into consideration, we investigate the optimal user scheduling and power allocation scheme that can maximize the ergodic sum rate of the cognitive system. We show that scheduling the user whose channel gain to interference and noise ratio (CGINR) is the largest for each frequency band is optimal. We also derive the dynamic power allocation scheme meeting the three practical constraints, i.e., the transmitter’s average transmission power constraint, the power amplifier’s instantaneous transmission power constraint, and the interference power constraint at the licensed user. The result shows that in different coherent time intervals and different frequency bands, the power allocation has a multi-level waterfilling structure. Theoretical analysis shows that the strategy scheduling user with the largest CGINR introduces significant performance improvement compared with the traditional strategy scheduling user with the largest channel gain to noise ratio (CGNR). We also illustrate the impact of power constraints and the number of users on system performance by simulation. cognitive radio (dpeaa)DE-He213 distributed (dpeaa)DE-He213 spatial spectrum holes (dpeaa)DE-He213 opportunistic scheduling (dpeaa)DE-He213 power allocation (dpeaa)DE-He213 Wang, HuiMing verfasserin aut Yin, QinYe verfasserin aut Enthalten in Science in China Heidelberg : Springer, 2001 55(2012), 6 vom: 24. Feb., Seite 1402-1414 (DE-627)385614764 (DE-600)2142898-0 1862-2836 nnns volume:55 year:2012 number:6 day:24 month:02 pages:1402-1414 https://dx.doi.org/10.1007/s11432-012-4562-2 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER SSG-OPC-BBI SSG-OPC-ASE GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_101 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_138 GBV_ILN_152 GBV_ILN_161 GBV_ILN_171 GBV_ILN_187 GBV_ILN_224 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 54.00 ASE AR 55 2012 6 24 02 1402-1414
spelling	10.1007/s11432-012-4562-2 doi (DE-627)SPR019308833 (SPR)s11432-012-4562-2-e DE-627 ger DE-627 rakwb eng 070 004 ASE 54.00 bkl Wang, QunHuan verfasserin aut Optimal user scheduling and power control in multi-user cognitive broadcast systems 2012 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract Cognitive radio systems should not only have the ability to sense and exploit “frequency spectrum holes”, but also the ability to sense and utilize “spatial spectrum holes”. In this paper, we consider the issue of maximizing the throughput of the cognitive systems by fully utilizing “spatial spectrum holes” brought in by multiple cognitive users, in the scenario where a pair of licensed users and a cognitive broadcast system share multiple spectrum bands. By exploiting the channel reciprocity under the premise that the licensed system adopts the time-division-duplexing (TDD) mode, we propose a more practical cognitive access scheme that can sense the interference at the licensed user caused by the cognitive transmitter, based on the existing feedback signals from the licensed user to the licensed base station. Taking both interferences from the licensed base station to the cognitive receiver and from the cognitive transmitter to the licensed user into consideration, we investigate the optimal user scheduling and power allocation scheme that can maximize the ergodic sum rate of the cognitive system. We show that scheduling the user whose channel gain to interference and noise ratio (CGINR) is the largest for each frequency band is optimal. We also derive the dynamic power allocation scheme meeting the three practical constraints, i.e., the transmitter’s average transmission power constraint, the power amplifier’s instantaneous transmission power constraint, and the interference power constraint at the licensed user. The result shows that in different coherent time intervals and different frequency bands, the power allocation has a multi-level waterfilling structure. Theoretical analysis shows that the strategy scheduling user with the largest CGINR introduces significant performance improvement compared with the traditional strategy scheduling user with the largest channel gain to noise ratio (CGNR). We also illustrate the impact of power constraints and the number of users on system performance by simulation. cognitive radio (dpeaa)DE-He213 distributed (dpeaa)DE-He213 spatial spectrum holes (dpeaa)DE-He213 opportunistic scheduling (dpeaa)DE-He213 power allocation (dpeaa)DE-He213 Wang, HuiMing verfasserin aut Yin, QinYe verfasserin aut Enthalten in Science in China Heidelberg : Springer, 2001 55(2012), 6 vom: 24. Feb., Seite 1402-1414 (DE-627)385614764 (DE-600)2142898-0 1862-2836 nnns volume:55 year:2012 number:6 day:24 month:02 pages:1402-1414 https://dx.doi.org/10.1007/s11432-012-4562-2 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER SSG-OPC-BBI SSG-OPC-ASE GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_101 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_138 GBV_ILN_152 GBV_ILN_161 GBV_ILN_171 GBV_ILN_187 GBV_ILN_224 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 54.00 ASE AR 55 2012 6 24 02 1402-1414
allfields_unstemmed	10.1007/s11432-012-4562-2 doi (DE-627)SPR019308833 (SPR)s11432-012-4562-2-e DE-627 ger DE-627 rakwb eng 070 004 ASE 54.00 bkl Wang, QunHuan verfasserin aut Optimal user scheduling and power control in multi-user cognitive broadcast systems 2012 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract Cognitive radio systems should not only have the ability to sense and exploit “frequency spectrum holes”, but also the ability to sense and utilize “spatial spectrum holes”. In this paper, we consider the issue of maximizing the throughput of the cognitive systems by fully utilizing “spatial spectrum holes” brought in by multiple cognitive users, in the scenario where a pair of licensed users and a cognitive broadcast system share multiple spectrum bands. By exploiting the channel reciprocity under the premise that the licensed system adopts the time-division-duplexing (TDD) mode, we propose a more practical cognitive access scheme that can sense the interference at the licensed user caused by the cognitive transmitter, based on the existing feedback signals from the licensed user to the licensed base station. Taking both interferences from the licensed base station to the cognitive receiver and from the cognitive transmitter to the licensed user into consideration, we investigate the optimal user scheduling and power allocation scheme that can maximize the ergodic sum rate of the cognitive system. We show that scheduling the user whose channel gain to interference and noise ratio (CGINR) is the largest for each frequency band is optimal. We also derive the dynamic power allocation scheme meeting the three practical constraints, i.e., the transmitter’s average transmission power constraint, the power amplifier’s instantaneous transmission power constraint, and the interference power constraint at the licensed user. The result shows that in different coherent time intervals and different frequency bands, the power allocation has a multi-level waterfilling structure. Theoretical analysis shows that the strategy scheduling user with the largest CGINR introduces significant performance improvement compared with the traditional strategy scheduling user with the largest channel gain to noise ratio (CGNR). We also illustrate the impact of power constraints and the number of users on system performance by simulation. cognitive radio (dpeaa)DE-He213 distributed (dpeaa)DE-He213 spatial spectrum holes (dpeaa)DE-He213 opportunistic scheduling (dpeaa)DE-He213 power allocation (dpeaa)DE-He213 Wang, HuiMing verfasserin aut Yin, QinYe verfasserin aut Enthalten in Science in China Heidelberg : Springer, 2001 55(2012), 6 vom: 24. Feb., Seite 1402-1414 (DE-627)385614764 (DE-600)2142898-0 1862-2836 nnns volume:55 year:2012 number:6 day:24 month:02 pages:1402-1414 https://dx.doi.org/10.1007/s11432-012-4562-2 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER SSG-OPC-BBI SSG-OPC-ASE GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_101 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_138 GBV_ILN_152 GBV_ILN_161 GBV_ILN_171 GBV_ILN_187 GBV_ILN_224 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 54.00 ASE AR 55 2012 6 24 02 1402-1414
allfieldsGer	10.1007/s11432-012-4562-2 doi (DE-627)SPR019308833 (SPR)s11432-012-4562-2-e DE-627 ger DE-627 rakwb eng 070 004 ASE 54.00 bkl Wang, QunHuan verfasserin aut Optimal user scheduling and power control in multi-user cognitive broadcast systems 2012 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract Cognitive radio systems should not only have the ability to sense and exploit “frequency spectrum holes”, but also the ability to sense and utilize “spatial spectrum holes”. In this paper, we consider the issue of maximizing the throughput of the cognitive systems by fully utilizing “spatial spectrum holes” brought in by multiple cognitive users, in the scenario where a pair of licensed users and a cognitive broadcast system share multiple spectrum bands. By exploiting the channel reciprocity under the premise that the licensed system adopts the time-division-duplexing (TDD) mode, we propose a more practical cognitive access scheme that can sense the interference at the licensed user caused by the cognitive transmitter, based on the existing feedback signals from the licensed user to the licensed base station. Taking both interferences from the licensed base station to the cognitive receiver and from the cognitive transmitter to the licensed user into consideration, we investigate the optimal user scheduling and power allocation scheme that can maximize the ergodic sum rate of the cognitive system. We show that scheduling the user whose channel gain to interference and noise ratio (CGINR) is the largest for each frequency band is optimal. We also derive the dynamic power allocation scheme meeting the three practical constraints, i.e., the transmitter’s average transmission power constraint, the power amplifier’s instantaneous transmission power constraint, and the interference power constraint at the licensed user. The result shows that in different coherent time intervals and different frequency bands, the power allocation has a multi-level waterfilling structure. Theoretical analysis shows that the strategy scheduling user with the largest CGINR introduces significant performance improvement compared with the traditional strategy scheduling user with the largest channel gain to noise ratio (CGNR). We also illustrate the impact of power constraints and the number of users on system performance by simulation. cognitive radio (dpeaa)DE-He213 distributed (dpeaa)DE-He213 spatial spectrum holes (dpeaa)DE-He213 opportunistic scheduling (dpeaa)DE-He213 power allocation (dpeaa)DE-He213 Wang, HuiMing verfasserin aut Yin, QinYe verfasserin aut Enthalten in Science in China Heidelberg : Springer, 2001 55(2012), 6 vom: 24. Feb., Seite 1402-1414 (DE-627)385614764 (DE-600)2142898-0 1862-2836 nnns volume:55 year:2012 number:6 day:24 month:02 pages:1402-1414 https://dx.doi.org/10.1007/s11432-012-4562-2 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER SSG-OPC-BBI SSG-OPC-ASE GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_101 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_138 GBV_ILN_152 GBV_ILN_161 GBV_ILN_171 GBV_ILN_187 GBV_ILN_224 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 54.00 ASE AR 55 2012 6 24 02 1402-1414
allfieldsSound	10.1007/s11432-012-4562-2 doi (DE-627)SPR019308833 (SPR)s11432-012-4562-2-e DE-627 ger DE-627 rakwb eng 070 004 ASE 54.00 bkl Wang, QunHuan verfasserin aut Optimal user scheduling and power control in multi-user cognitive broadcast systems 2012 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract Cognitive radio systems should not only have the ability to sense and exploit “frequency spectrum holes”, but also the ability to sense and utilize “spatial spectrum holes”. In this paper, we consider the issue of maximizing the throughput of the cognitive systems by fully utilizing “spatial spectrum holes” brought in by multiple cognitive users, in the scenario where a pair of licensed users and a cognitive broadcast system share multiple spectrum bands. By exploiting the channel reciprocity under the premise that the licensed system adopts the time-division-duplexing (TDD) mode, we propose a more practical cognitive access scheme that can sense the interference at the licensed user caused by the cognitive transmitter, based on the existing feedback signals from the licensed user to the licensed base station. Taking both interferences from the licensed base station to the cognitive receiver and from the cognitive transmitter to the licensed user into consideration, we investigate the optimal user scheduling and power allocation scheme that can maximize the ergodic sum rate of the cognitive system. We show that scheduling the user whose channel gain to interference and noise ratio (CGINR) is the largest for each frequency band is optimal. We also derive the dynamic power allocation scheme meeting the three practical constraints, i.e., the transmitter’s average transmission power constraint, the power amplifier’s instantaneous transmission power constraint, and the interference power constraint at the licensed user. The result shows that in different coherent time intervals and different frequency bands, the power allocation has a multi-level waterfilling structure. Theoretical analysis shows that the strategy scheduling user with the largest CGINR introduces significant performance improvement compared with the traditional strategy scheduling user with the largest channel gain to noise ratio (CGNR). We also illustrate the impact of power constraints and the number of users on system performance by simulation. cognitive radio (dpeaa)DE-He213 distributed (dpeaa)DE-He213 spatial spectrum holes (dpeaa)DE-He213 opportunistic scheduling (dpeaa)DE-He213 power allocation (dpeaa)DE-He213 Wang, HuiMing verfasserin aut Yin, QinYe verfasserin aut Enthalten in Science in China Heidelberg : Springer, 2001 55(2012), 6 vom: 24. Feb., Seite 1402-1414 (DE-627)385614764 (DE-600)2142898-0 1862-2836 nnns volume:55 year:2012 number:6 day:24 month:02 pages:1402-1414 https://dx.doi.org/10.1007/s11432-012-4562-2 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER SSG-OPC-BBI SSG-OPC-ASE GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_101 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_138 GBV_ILN_152 GBV_ILN_161 GBV_ILN_171 GBV_ILN_187 GBV_ILN_224 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 54.00 ASE AR 55 2012 6 24 02 1402-1414
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source	Enthalten in Science in China 55(2012), 6 vom: 24. Feb., Seite 1402-1414 volume:55 year:2012 number:6 day:24 month:02 pages:1402-1414
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authorswithroles_txt_mv	Wang, QunHuan @@aut@@ Wang, HuiMing @@aut@@ Yin, QinYe @@aut@@
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author	Wang, QunHuan
spellingShingle	Wang, QunHuan ddc 070 bkl 54.00 misc cognitive radio misc distributed misc spatial spectrum holes misc opportunistic scheduling misc power allocation Optimal user scheduling and power control in multi-user cognitive broadcast systems
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topic_title	070 004 ASE 54.00 bkl Optimal user scheduling and power control in multi-user cognitive broadcast systems cognitive radio (dpeaa)DE-He213 distributed (dpeaa)DE-He213 spatial spectrum holes (dpeaa)DE-He213 opportunistic scheduling (dpeaa)DE-He213 power allocation (dpeaa)DE-He213
topic	ddc 070 bkl 54.00 misc cognitive radio misc distributed misc spatial spectrum holes misc opportunistic scheduling misc power allocation
topic_unstemmed	ddc 070 bkl 54.00 misc cognitive radio misc distributed misc spatial spectrum holes misc opportunistic scheduling misc power allocation
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title	Optimal user scheduling and power control in multi-user cognitive broadcast systems
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title_full	Optimal user scheduling and power control in multi-user cognitive broadcast systems
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author_browse	Wang, QunHuan Wang, HuiMing Yin, QinYe
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title_sort	optimal user scheduling and power control in multi-user cognitive broadcast systems
title_auth	Optimal user scheduling and power control in multi-user cognitive broadcast systems
abstract	Abstract Cognitive radio systems should not only have the ability to sense and exploit “frequency spectrum holes”, but also the ability to sense and utilize “spatial spectrum holes”. In this paper, we consider the issue of maximizing the throughput of the cognitive systems by fully utilizing “spatial spectrum holes” brought in by multiple cognitive users, in the scenario where a pair of licensed users and a cognitive broadcast system share multiple spectrum bands. By exploiting the channel reciprocity under the premise that the licensed system adopts the time-division-duplexing (TDD) mode, we propose a more practical cognitive access scheme that can sense the interference at the licensed user caused by the cognitive transmitter, based on the existing feedback signals from the licensed user to the licensed base station. Taking both interferences from the licensed base station to the cognitive receiver and from the cognitive transmitter to the licensed user into consideration, we investigate the optimal user scheduling and power allocation scheme that can maximize the ergodic sum rate of the cognitive system. We show that scheduling the user whose channel gain to interference and noise ratio (CGINR) is the largest for each frequency band is optimal. We also derive the dynamic power allocation scheme meeting the three practical constraints, i.e., the transmitter’s average transmission power constraint, the power amplifier’s instantaneous transmission power constraint, and the interference power constraint at the licensed user. The result shows that in different coherent time intervals and different frequency bands, the power allocation has a multi-level waterfilling structure. Theoretical analysis shows that the strategy scheduling user with the largest CGINR introduces significant performance improvement compared with the traditional strategy scheduling user with the largest channel gain to noise ratio (CGNR). We also illustrate the impact of power constraints and the number of users on system performance by simulation.
abstractGer	Abstract Cognitive radio systems should not only have the ability to sense and exploit “frequency spectrum holes”, but also the ability to sense and utilize “spatial spectrum holes”. In this paper, we consider the issue of maximizing the throughput of the cognitive systems by fully utilizing “spatial spectrum holes” brought in by multiple cognitive users, in the scenario where a pair of licensed users and a cognitive broadcast system share multiple spectrum bands. By exploiting the channel reciprocity under the premise that the licensed system adopts the time-division-duplexing (TDD) mode, we propose a more practical cognitive access scheme that can sense the interference at the licensed user caused by the cognitive transmitter, based on the existing feedback signals from the licensed user to the licensed base station. Taking both interferences from the licensed base station to the cognitive receiver and from the cognitive transmitter to the licensed user into consideration, we investigate the optimal user scheduling and power allocation scheme that can maximize the ergodic sum rate of the cognitive system. We show that scheduling the user whose channel gain to interference and noise ratio (CGINR) is the largest for each frequency band is optimal. We also derive the dynamic power allocation scheme meeting the three practical constraints, i.e., the transmitter’s average transmission power constraint, the power amplifier’s instantaneous transmission power constraint, and the interference power constraint at the licensed user. The result shows that in different coherent time intervals and different frequency bands, the power allocation has a multi-level waterfilling structure. Theoretical analysis shows that the strategy scheduling user with the largest CGINR introduces significant performance improvement compared with the traditional strategy scheduling user with the largest channel gain to noise ratio (CGNR). We also illustrate the impact of power constraints and the number of users on system performance by simulation.
abstract_unstemmed	Abstract Cognitive radio systems should not only have the ability to sense and exploit “frequency spectrum holes”, but also the ability to sense and utilize “spatial spectrum holes”. In this paper, we consider the issue of maximizing the throughput of the cognitive systems by fully utilizing “spatial spectrum holes” brought in by multiple cognitive users, in the scenario where a pair of licensed users and a cognitive broadcast system share multiple spectrum bands. By exploiting the channel reciprocity under the premise that the licensed system adopts the time-division-duplexing (TDD) mode, we propose a more practical cognitive access scheme that can sense the interference at the licensed user caused by the cognitive transmitter, based on the existing feedback signals from the licensed user to the licensed base station. Taking both interferences from the licensed base station to the cognitive receiver and from the cognitive transmitter to the licensed user into consideration, we investigate the optimal user scheduling and power allocation scheme that can maximize the ergodic sum rate of the cognitive system. We show that scheduling the user whose channel gain to interference and noise ratio (CGINR) is the largest for each frequency band is optimal. We also derive the dynamic power allocation scheme meeting the three practical constraints, i.e., the transmitter’s average transmission power constraint, the power amplifier’s instantaneous transmission power constraint, and the interference power constraint at the licensed user. The result shows that in different coherent time intervals and different frequency bands, the power allocation has a multi-level waterfilling structure. Theoretical analysis shows that the strategy scheduling user with the largest CGINR introduces significant performance improvement compared with the traditional strategy scheduling user with the largest channel gain to noise ratio (CGNR). We also illustrate the impact of power constraints and the number of users on system performance by simulation.
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title_short	Optimal user scheduling and power control in multi-user cognitive broadcast systems
url	https://dx.doi.org/10.1007/s11432-012-4562-2
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author2	Wang, HuiMing Yin, QinYe
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doi_str	10.1007/s11432-012-4562-2
up_date	2024-07-04T01:03:19.430Z
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We show that scheduling the user whose channel gain to interference and noise ratio (CGINR) is the largest for each frequency band is optimal. We also derive the dynamic power allocation scheme meeting the three practical constraints, i.e., the transmitter’s average transmission power constraint, the power amplifier’s instantaneous transmission power constraint, and the interference power constraint at the licensed user. The result shows that in different coherent time intervals and different frequency bands, the power allocation has a multi-level waterfilling structure. Theoretical analysis shows that the strategy scheduling user with the largest CGINR introduces significant performance improvement compared with the traditional strategy scheduling user with the largest channel gain to noise ratio (CGNR). 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Optimal user scheduling and power control in multi-user cognitive broadcast systems

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