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- 저자 : Xianzhong Xie (검색결과 4 건)
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Fair Power Control Using Game Theory with Pricing Scheme in Cognitive Radio Networks
Xie, Xianzhong,Yang, Helin,Vasilakos, Athanasios V.,He, Lu The Korea Institute of Information and Commucation 2014 Journal of communications and networks Vol.16 No.2
This paper proposes a payment-based power control scheme using non-cooperative game with a novel pricing function in cognitive radio networks (CRNs). The proposed algorithm considers the fairness of power control among second users (SUs) where the value of per SU' signal to noise ratio (SINR) or distance between SU and SU station is used as reference for punishment price setting. Due to the effect of uncertainty fading environment, the system is unable to get the link gain coefficient to control SUs' transmission power accurately, so the quality of service (QoS) requirements of SUs may not be guaranteed, and the existence of Nash equilibrium (NE) is not ensured. Therefore, an alternative iterative scheme with sliding model is presented for the non-cooperative power control game algorithm. Simulation results show that the pricing policy using SUs' SINR as price punishment reference can improve total throughput, ensure fairness and reduce total transmission power in CRNs.
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Fair Power Control Using Game Theory with Pricing Scheme in Cognitive Radio Networks
Xianzhong Xie,Helin Yang,Athanasios V. Vasilakos,Lu He 한국통신학회 2014 Journal of communications and networks Vol.16 No.2
This paper proposes a payment-based power controlscheme using non-cooperative game with a novel pricing functionin cognitive radio networks (CRNs). The proposed algorithm considersthe fairness of power control among second users (SUs)where the value of per SU’ signal to noise ratio (SINR) or distancebetween SU and SU station is used as reference for punishmentprice setting. Due to the effect of uncertainty fading environment,the system is unable to get the link gain coefficient tocontrol SUs’ transmission power accurately, so the quality of service(QoS) requirements of SUs may not be guaranteed, and theexistence of Nash equilibrium (NE) is not ensured. Therefore, analternative iterative scheme with sliding model is presented for thenon-cooperative power control game algorithm. Simulation resultsshow that the pricing policy using SUs’ SINR as price punishmentreference can improve total throughput, ensure fairness and reducetotal transmission power in CRNs.
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Joint Beamforming and Precoding in TD-SCDMA Downlink System
Wanhong Ba,Xianzhong Xie 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
In this paper, beamforming and precoding is combined to improve the performance of TD-SCDMA downlink based on MIMO (Multiple-Input-Multiple-Output). We deduced beamforming vector and precoding matrix combined beamforming and precoding. And then, we compared beamforming scheme based signal-to-interference-plus-noise ratio (SINR) and based signal-to-leakage-plus-noise ratio (SLNR) in TD-SCDMA Downlink System. The performance of scheme with precoding based on SINR and SLNR outperform than the scheme without precoding. As the user number or the number of receive antenna increase, the beamforming scheme with precoding outperform the traditional beamforming still, and the beamforming precoding based on SLNR is superior gradually to the beamforming precoding based on SINR.
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Bandwidth-efficient Cooperative Diversity with Rotated Constellations and Its Performance Analysis
( Weijia Lei ),( Xiangming Li ),( Xianzhong Xie ) 한국인터넷정보학회 2010 KSII Transactions on Internet and Information Syst Vol.4 No.6
Cooperative diversity is a technique with which a virtual multiple antenna array is established among the single antenna users of the wireless network to realize space diversity. Signal space diversity (SSD) is a bandwidth-efficient diversity technique, which uses constellation rotation and interleaving techniques to achieve diversity gain. A new cooperative diversity scheme with rotated constellations (RCCD) is proposed in this paper. In this scheme, data are modulated by using a rotated constellation, and the source and the relays transmit different components of the modulated symbols. Since any one of the components contains full information of the symbols, the destination can obtain multiple signals conveying the same information from different users. In this way, space diversity is achieved. The RCCD scheme inherits the advantage of SSD - being bandwidth-efficient but without the delay problem of SSD brought by interleaving. The symbol error rate of the RCCD scheme is analyzed and simulated. The analysis and simulation results show that the RCCD scheme can achieve full diversity order of two when the inter-user channel is good enough, and, with the same bandwidth efficiency, has a better performance than amplify-and-forward and detect-and-forward methods.
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