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- 저자 : Weidang Lu (검색결과 4 건)
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Lu, Weidang,Wang, Jing,Ge, Weidong,Li, Feng,Hua, Jingyu,Meng, Limin The Korea Institute of Information and Commucation 2014 Journal of communications and networks Vol.16 No.2
In this paper, we propose an anti-interference cooperative spectrum sharing strategy for cognitive system, in which a secondary system can operate on the same spectrum of a primary system. Specifically, the primary system leases a fraction of its transmission time to the secondary system in exchange for cooperation to achieve the target rate. To gain access to the spectrum of the primary system, the secondary system needs to allocate a fraction of bandwidth to help forward the primary signal. As a reward, the secondary system can use the remaining bandwidth to transmit its own signal. The secondary system uses different bandwidth to transmit the primary and its own signal. Thus, there will be no interference felt at primary and secondary systems. We study the joint optimization of time and bandwidth allocation such that the transmission rate of the secondary system is maximized, while guaranteeing the primary system, as a higher priority, to achieve its target transmission rate. Numerical results show that the secondary system can gain significant improvement with the proposed strategy.
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Weidang Lu,Jing Wang,Weidong Ge,Feng Li,Jingyu Hua,Limin Meng 한국통신학회 2014 Journal of communications and networks Vol.16 No.2
In this paper, we propose an anti-interference cooperativespectrum sharing strategy for cognitive system, in which a secondarysystem can operate on the same spectrum of a primary system. Specifically, the primary system leases a fraction of its transmissiontime to the secondary system in exchange for cooperationto achieve the target rate. To gain access to the spectrum of theprimary system, the secondary system needs to allocate a fractionof bandwidth to help forward the primary signal. As a reward,the secondary system can use the remaining bandwidth to transmitits own signal. The secondary system uses different bandwidthto transmit the primary and its own signal. Thus, there will beno interference felt at primary and secondary systems. We studythe joint optimization of time and bandwidth allocation such thatthe transmission rate of the secondary system is maximized, whileguaranteeing the primary system, as a higher priority, to achieveits target transmission rate. Numerical results show that the secondarysystem can gain significant improvement with the proposedstrategy.
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Contract Theory Based Cooperative Spectrum Sharing with Joint Power and Bandwidth Optimization
( Weidang Lu ),( Chenxin He ),( Yuanrong Lin ),( Hong Peng ),( Xin Liu ) 한국인터넷정보학회 2017 KSII Transactions on Internet and Information Syst Vol.11 No.12
In this paper, we proposed a contract theory based cooperative spectrum sharing scheme with joint power and bandwidth optimization under asymmetric information, where the primary user (PU) does not know the secondary users’ (SUs) private information. To improve performance, PU needs to provide incentives to stimulate nearby SUs to help forward its signal. By using contract theory, PU and SUs’ negotiations are modeled as a labor market. PU and SUs act as the employer and employees, respectively. Specifically, SUs provide labor (i.e. the relay power, which can be used for forwarding PU’s signal) in exchange for the reward (i.e. the spectrum access bandwidth which can be used for transmitting their own signals). PU needs to overcome a challenge how to balance the relationship between contributions and incentives for the SUs. We study the optimal contract design which consists of relay power and spectrum access bandwidth allocation. We show that the most efficient SUs will be hired by the PU to attend the cooperative communication. PU can achieve the same maximum utility as in the symmetric information scenario. Simulation results confirm that the utility of PU is significantly enhanced with our proposed cooperative spectrum sharing scheme.
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( Weidang Lu ),( Yufei Zhu ),( Mengyun Wang ),( Hong Peng ),( Xin Liu ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.5
In this paper, we propose a sum transmission rate maximization based cooperative spectrum sharing protocol with quality-of-service (QoS) support for both of the primary and secondary systems, which exploits the situation when the primary system experiences a weak channel. The secondary transmitter ST<sub>b</sub> which provides the best performance for the primary and secondary systems is selected to forward the primary signal. Specifically, ST<sub>b</sub> helps the primary system achieve the target rate by using a fraction of its power to forward the primary signal. As a reward, it can gain spectrum access by using the remaining power to transmit its own signal. We study the secondary user selection and optimal power allocation such that the sum transmission rate of primary and secondary systems is maximized, while the QoS of both primary and secondary systems can be guaranteed. Simulation results demonstrate the efficiency of the proposed spectrum sharing protocol and its benefit to both primary and secondary systems.
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