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2012 IEEE 14th International Conference on Communication Technology

作者： Zheng Qianqian Xu Chunxiu Wu Muqing Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications

ISBN: (纸本)9781467321006

This paper focuses on the Geometry based Stochastic Channel Model (GSCM) and its application in high speed railway (HSR) multiple-input multiple-output (MIMO) *** probability distribution functions (PDFs) of scatterers are studied and simulation results show that scatterers in Gaussian distribution make the best approximation to the realistic power delay profile (PDP) and power azimuth spectra (PAS).Additionally,the impacts of different scattering area shapes on the PDP and PAS in high speed railway scenario are *** on the conclusions above and existing measurement data,a novel channel model is established with local and far scatterer clusters for high speed railway *** simulation results verify that our model is realistic.

关键词： Geometry Based Stochastic Channel Model (GSCM) power delay profile (PDP) power azimuth spectra (PAS) High Speed Railway(HSR) multiple-input multiple- output (MIMO)

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Distributed Power Self-Optimization with Convex Pricing in Dense Femtocell networks via an Exact Potential Game

Distributed Power Self-Optimization with Convex Pricing in D...

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IEEE International Symposium on Personal, Indoor and Mobile Radio Communications

作者： Xidong Wang Wei Zheng Jingfang Liu Wei Li Xiangming Wen Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing P.R. China

ISBN: (纸本)9781467362337

With the sharp increasing demand of the indoor coverage and network capacity, dense femtocells are the ultimate target of the femto cellular network deployment in urban environment. However, dense femtocell deployment could introduce excessive inter-femtocell interference (IFI). To address this problem, this paper proposes a distributed power self-optimization scheme for the downlink of dense femtocell networks. First, a noncooperative power self-optimization game framework is established based on the exact potential game, which is demonstrated to converge to a pure and unique Nash Equilibrium. Then, a novel convex pricing mechanism is presented to price the transmit power of femtocells. Finally, combined with Firefly Intelligence Optimization (FIO), an effective power self-optimization algorithm with guaranteed convergence is proposed to achieve the Nash Equilibrium. With practical LTE parameters and 3GPP dualstrip femtocell model, simulation results show that the proposed scheme dramatically reduce femtocells transmit power while improving the throughput of dense femtocell networks compared to the scheme with non-linear pricing.

关键词： ultimate target femto improving

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Low Complexity Energy-Efficient Resource Allocation in Down-link Dense Femtocell networks

Low Complexity Energy-Efficient Resource Allocation in Down-...

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IEEE International Symposium on Personal, Indoor and Mobile Radio Communications

作者： Zhicai Zhang Haijun Zhang Zhenmin Zhao Hui Liu Xiangming Wen Wenpeng Jing Beijing Key Laboratory of Network System Architecture and Convergence School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing

ISBN: (纸本)9781467362337

Femtocells have attracted growing attentions in academia, industry, and standardization forums in recent years. However, most of existing works on femtocell networks are focused on spectrum efficiency and interference mitigation, energy efficiency aspect is neglected. In this paper, we investigate the maximization of energy efficiency of downlink OFDMA dense femtocell networks by efficient resource allocation. To decrease the complexity, joint subchannel allocation and power control are decomposed into two steps. Power control has been modeled as a non-cooperative game, a closed-form best response of transmit power is obtained. Considering fairness and low complexity, a fair time-averaged subchannel allocation metric have been derived out. Based on that, we propose a distributed suboptimal subchannel allocation and optimal power control algorithm. Simulation results show that the proposed algorithm has a low complexity with slight loss of energy efficiency compared with Round-Robin Scheduling and a noncooperative energy-efficient power optimization algorithm.

关键词： efficiency interference proposed

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Modeling deterministic echo state network with loop reservoir

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Journal of Zhejiang University-Science C(Computers and Electronics) 2012年第9期13卷 689-701页

作者： Xiao-chuan SUN Hong-yan CUI Ren-ping LIU Jian-ya CHEN Yun-jie LIU Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing 100876China ICT Centre Commonwealth Scientific and lndustrial Research OrganizationSydney 1710Austraiia

Echo state network (ESN), which efficiently models nonlinear dynamic systems, has been proposed as a special form of recurrent neural network. However, most of the proposed ESNs consist of complex reservoir structures, leading to excessive computational cost. Recently, minimum complexity ESNs were proposed and proved to exhibit high performance and low computational cost. In this paper, we propose a simple deterministic ESN with a loop reservoir, i.e., an ESN with an adjacent-feedback loop reservoir. The novel reservoir is constructed by introducing regular adjacent feedback based on the simplest loop reservoir. Only a single free parameter is tuned, which considerably simplifies the ESN construction. The combination of a simplified reservoir and fewer free parameters provides superior prediction performance. In the benchmark datasets and real-world tasks, our scheme obtains higher prediction accuracy with relatively low complexity, compared to the classic ESN and the minimum complexity ESN. Furthermore, we prove that all the linear ESNs with the simplest loop reservoir possess the same memory capacity, arbitrarily converging to the optimal value.

关键词： Echo state networks Loop reservoir structure Memory capacity

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Semi-active handover algorithm assisted on location for heterogeneous wireless networks

Semi-active handover algorithm assisted on location for hete...

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4th International Conference on Ubiquitous and Future networks, ICUFN 2012

作者： Jiang, Yiheng Sun, Yong Wen, Xiangming Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9781467313773

This paper illustrates a semi-active handover algorithm on the integrated utilization of RSS and location, according to characteristics of a cellular network and WiFi. While connecting to a cellular network, MS (Mobile Station) is in the passive mode, where BS (Base Station) informs the MS to hand over on the basis of location information. In contrast, MS in the WiFi link chooses the optimal AP (Access Point) or switches to the cellular network in light of the detection algorithm proposed by this paper. The final emulation could prove the semi-active mechanism to effectively prevent the occurrence of a ping-pong effect, and improve performance to the right network. © 2012 IEEE.

关键词： Location

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A multipath routing algorithm based on OSPF routing protocol

A multipath routing algorithm based on OSPF routing protocol

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2012 8th International Conference on Semantics, Knowledge and Grids, SKG 2012

作者： Li, Lan Li, Li Chen, Jianya Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9780769547947

Currently, the Internet has become an significant part of the global communication infrastructure. With more and more new services emerging, the current IP network may not satisfy the user demands in the future. At present, most routing scheme typically routes all the traffic over one discovered single path, which are inherently slow in responding to congestion and traffic burst. Furthermore, the use of only one single path often causes the waste of network resources. As a single-path routing protocol, Open Shortest Path First (OSPF) suffers the same problems. An alternative method to solve the problems is multipath routing. With better sharing, the multipath routing shows the better performance. This paper develops a multipath routing algorithm (DSMC) based on the multi-metrics of the link - bandwidth and propagation delay. And, the simulation results reveals the superiority of the multipath routing algorithm (DSMC) in three aspects, which are better load balancing, smaller queuing delay and better average utilization of the network. © 2012 IEEE.

关键词： Routing protocols

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Degree of freedom of MIMO ICR under power allocation with optimized interference alignment

Degree of freedom of MIMO ICR under power allocation with op...

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2012 15th International Symposium on Wireless Personal Multimedia Communications, WPMC 2012

作者： Wang, Wei Zhang, Tiankui Zhao, Song Zeng, Zhimin Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9789860334074

The interference channel of multi-antenna source-destination pairs with a multiple-input-multiple-output relay, which is named as MIMO ICR, is the general network structure in the wireless relay networks. This paper investigates degree of freedom (DOF) of K source-destination pairs MIMO ICR under the power allocation with an optimized interference alignment scheme. In the MIMO ICR, each destination aligns the interference of two hops and uses zero-forcing to eliminate the interference, and the power of the relay is an exponential function of the source's transmitted power Px with the coefficient α. The properties of capacity of the channel can be described by the sum-rate and scaled by the DOF. It has been proved that, the DOF with optimized IA and the exponential power allocation of the relay is proportional with the number of the source-destination pairs K and the coefficient α. The simulation results show that in the condition Px >0 dB, both the increasing of the source transmitted power and the coefficient α make the sum-rate rising. Meanwhile, the value of DOF of MIMO ICR approaches the value of Kα. © 2012 NiCT.

关键词： MIMO systems

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Multi-relay selection scheme based on quantum particle swarm optimization in relay networks

Multi-relay selection scheme based on quantum particle swarm...

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2012 15th International Symposium on Wireless Personal Multimedia Communications, WPMC 2012

作者： Cao, Jinlong Zhang, Tiankui Zeng, Zhimin Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9789860334074

Multi-relay selection scheme for cooperative relaying considering the signal to noise ratio (SNR) maximization and power efficiency optimization is proposed in this paper. In cooperative relay networks, the selected relay nodes have great impact on the system performance. It is an optimization problem for best cooperative relay node number and which relay nodes are selected. The exhaustive search can solve this problem but the complexity will increase exponentially with the network size, i.e., the number of relays in the network. This paper proposes two novel quantum particle swarm optimization (QPSO) based relay selection schemes with the SNR optimization target and power efficiency target respectively. Simulation results show that the QPSO-based multi-relay selection scheme has the ability to search global optimal solution compared with other multi-relay selection algorithm in literature. © 2012 NiCT.

关键词： Particle swarm optimization (PSO)

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Video quality assessment based on Fast Structural Similarity index algorithm

Video quality assessment based on Fast Structural Similarity...

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4th International Conference on Ubiquitous and Future networks, ICUFN 2012

作者： Liu, Zhen Sun, Yong Zhang, Jingjing Wen, Xiangming Su, Tao Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9781467313773

Objective quality measures play important roles in fast image and video quality assessment (VQA). In the paper, a Fast Structural Similarity (FSSIM) index algorithm, which modifies Structural Similarity (SSIM) to achieve a high speed of execution, is used to assess the quality of real-time video application. The experimental results show that the FSSIM index algorithm not only has competitive performance with normal SSIM for assessing video quality, but also has much lower computational complexity. © 2012 IEEE.

关键词： Computational complexity

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Clustering based power saving algorithm for self-organized sleep mode in femtocell networks

Clustering based power saving algorithm for self-organized s...

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2012 15th International Symposium on Wireless Personal Multimedia Communications, WPMC 2012

作者： Li, Wei Zheng, Wei Xie, Yuanbao Wen, Xiangming Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9789860334074

A large-scale deployment of femtocell BSs (FBSs) causes the substantial energy consumption. One fairly intuitive way to minimize the energy consumption is to switch off the wireless air interface, or to keep FBSs in the energy saving mode for the most time while preserving the quality of service (QoS) experienced by users. Utilizing this concept, this paper proposes a clustering based power saving algorithm (CPSA) for self-organized sleep mode in femtocell networks. Firstly, CPSA builds a leader-member cluster framework, in which each FBS is either a FBS leader (FL) or a FBS member (FM). Then, the FL acts as an autonomous entity and is responsible for detecting active calls in the cluster coverage, while the FMs without the active user can entirely shut down pilot transmissions and the related processing all the time. So it is suited for self-organizing networks (SONs). With the practical LTE system parameters, simulation results show that the proposed algorithm outperforms three prominent related schemes in terms of average energy consumption and accumulative interference time. Furthermore, the results provide some guidelines for deploying energy efficient femtocell networks. © 2012 NiCT.

关键词： Femtocell

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