Abstract:Along with other advantages, throughput enrichment is considered a main advantage provided by network coding. It is a lightweight, efficient, easy to implement technique that can be used to resolve security related issues in resource constraint wireless ad hoc networks. To utilize the advantages of network coding, we present a lightweight key distribution scheme based on inherent security property of network coding. Our novel scheme is a combination of simple XOR network coding operations and message authentication codes (MACs) to achieve data confidentiality and guarantee the integrity of the distributed keys, respectively. A thorough security analysis is given to explain the effectiveness of our scheme against eavesdropping and impersonation attacks as well as with few reasonable assumptions, it could withstand more intelligent attacks i.e. node compromising and brute force attacks. this scheme requires adequate amount of memory and we have also discussed memory aspects of our scheme. Simulation analysis proved that while key exchange between two nodes in same cluster, this scheme achieved more than 95% key delivery ratio with an ignorable average delay of 2 m.s. 58% key delivery ratio was achieved while the key was exchanged between two nodes in different clusters and the average delay was around 10 m.s.

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	1. Light Weight Network Coding based Key Distribution Scheme for MANETs
	Liu Jianwei ,Abdur Rashid Sangi,Ruiying Du,Qianhong Wu
	Electrics, Communication and Autocontrol Technology 30 December 2012
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	Abstract:Along with other advantages, throughput enrichment is considered a main advantage provided by network coding. It is a lightweight, efficient, easy to implement technique that can be used to resolve security related issues in resource constraint wireless ad hoc networks. To utilize the advantages of network coding, we present a lightweight key distribution scheme based on inherent security property of network coding. Our novel scheme is a combination of simple XOR network coding operations and message authentication codes (MACs) to achieve data confidentiality and guarantee the integrity of the distributed keys, respectively. A thorough security analysis is given to explain the effectiveness of our scheme against eavesdropping and impersonation attacks as well as with few reasonable assumptions, it could withstand more intelligent attacks i.e. node compromising and brute force attacks. this scheme requires adequate amount of memory and we have also discussed memory aspects of our scheme. Simulation analysis proved that while key exchange between two nodes in same cluster, this scheme achieved more than 95% key delivery ratio with an ignorable average delay of 2 m.s. 58% key delivery ratio was achieved while the key was exchanged between two nodes in different clusters and the average delay was around 10 m.s.
	TO cite this article:Liu Jianwei ,Abdur Rashid Sangi,Ruiying Du, et al. Light Weight Network Coding based Key Distribution Scheme for MANETs[OL].[30 December 2012] http://en.paper.edu.cn/en_releasepaper/content/4505634


	2. Modeling and Cost Analysis of an Improved Movement-Based Location Update Scheme in Wireless Communication Networks
	WANG Xian,JIANG Wei,YUAN Wei-Na
	Electrics, Communication and Autocontrol Technology 27 December 2012
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	Abstract:An improved movement-based location update (IMBLU) scheme was proposed in the literature to tackle the vulnerability of the original movement-based location update (OMBLU) scheme, which performs a location update (LU) when the number of cells crossed reaches a movement threshold, to the ping-pong effect, a synonym for the phenomenon that a user equipment (UE) moves back-and-forth between adjacent cells. In the IMBLU scheme the criterion for performing an LU is that the number of different cells visited reaches the movement threshold. Prior to implementing the IMBLU scheme in wireless communication networks, first we need to determine the optimal movement threshold that minimizes the signaling cost of the IMBLU scheme incurred by LUs and paging. Therefore, a comprehensive mathematical model is required. This paper devotes to this requirement by developing such a model to analyze the signaling cost of the IMBLU scheme. We characterize UE mobility by a one-dimensional random walk model and derive closed-form analytical formula for the signaling cost of the IMBLU scheme, based on which we carry out a numerical to investigate the influence of relevant parameters on the signaling cost. It is observed that the signaling cost is a downward convex function with respect to the movement threshold, that the superiority of the IMBLU scheme over the OMBLU scheme is proportional to the intensity of the ping-pong effect, as well as that the variance of cell residence time exerts noticeable influence on the signaling cost only in the scenario of low mobility. This paper can guide the implementation of the IMBLU scheme in wireless communication networks.
	TO cite this article:WANG Xian,JIANG Wei,YUAN Wei-Na. Modeling and Cost Analysis of an Improved Movement-Based Location Update Scheme in Wireless Communication Networks[OL].[27 December 2012] http://en.paper.edu.cn/en_releasepaper/content/4508970

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	3. Energy- and Spectral-efficiency Tradeoff From Nash Bargaining Aspect
	ZHANG Ling,GAO Jinchun,XIE Gang
	Electrics, Communication and Autocontrol Technology 13 December 2012
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	Abstract:Conventional design of wireless networks mainly focuses on system capacity and spectral efficiency（SE）. As green radio (GR) becomes an inevitable trend, energy-efficient design is becoming more and more important. For SE oriented design, it can improve the system rate as much as possible, but energy efficiency (EE) may be not desirable. Similarly, for EE oriented design, it can save the energy mostly, but the system rate may be low. It can be proved that Pareto Optimality between SE and EE exists. In this paper, a new design about the tradeoff between SE and EE is addressed on the basis of Nash Bargaining to improve the system's comprehensive performance. With this design, we can not only improve the transmission rate but also save the energy. We first set up a general EE-SE tradeoff framework, then demonstrate the new objective function is strictly quasi-concave and get the unique and optimal Nash Bargaining Solutions (NBS).
	TO cite this article:ZHANG Ling,GAO Jinchun,XIE Gang. Energy- and Spectral-efficiency Tradeoff From Nash Bargaining Aspect[OL].[13 December 2012] http://en.paper.edu.cn/en_releasepaper/content/4503773


	4. Routing and Spectrum Allocation Algorithm Considering Traffic Balancing in Flexi-grid Optical Networks
	Yu Yue,Zhao Yongli,Yu Xiaosong,Zhang Jie,Gui Keyi
	Electrics, Communication and Autocontrol Technology 06 December 2012
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	Abstract:Routing and spectrum allocation is one of the most important problems in flexi-grid optical networks. Flexi-grid opticla network can improve the spectrum efficiency to a large extent compared with traditional fixed grid WDM optical networks. While the dynamic lightpath setup and teardown procedure will inevitably lead to traffic unbalancing which may block the new connections under the constraints of spectrum continuity and consecutiveness. Traffic balancing can distribute the services into the entire network, and then the probability of service collisions will be reduced. Simulation results indicate that RSA algorithm which consider the performance of traffic balancing is better than the one which only consider the performance of spectrum resource utilization.
	TO cite this article:Yu Yue,Zhao Yongli,Yu Xiaosong, et al. Routing and Spectrum Allocation Algorithm Considering Traffic Balancing in Flexi-grid Optical Networks[OL].[ 6 December 2012] http://en.paper.edu.cn/en_releasepaper/content/4496780


	5. A Novel Proportional Fair Scheduling Algorithm in Relay Based OFDMA Systems
	WANG Xiaoting,WANG Yuliang
	Electrics, Communication and Autocontrol Technology 07 November 2012
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	Abstract:This paper proposes a novel proportional fair scheduling (NPFS) scheme in a relay based Orthogonal Frequency Division Multiple Access (OFDMA) downlink scenario. The NPFS scheme generalizes the basic idea of proportional fair scheduling (PFS) algorithm and considers not only the channel condition, but also the user throughput and packet delay before making the final decision. Compared with the traditional proportional fair (PF) scheme, the proposed algorithm can obtain larger system throughput and lower average packet delay with approximately the same user fairness. Simulation results verify that the NPFS scheme is able to make a better tradeoff between system throughput and user fairness than its counterparts.
	TO cite this article:WANG Xiaoting,WANG Yuliang. A Novel Proportional Fair Scheduling Algorithm in Relay Based OFDMA Systems[OL].[ 7 November 2012] http://en.paper.edu.cn/en_releasepaper/content/4494709


	6. 100-km Long-Reach WDM-PON Using High Power Efficient On-Off Keying Codes in Downstream
	Wang Yanhong,Zhang Min
	Electrics, Communication and Autocontrol Technology 05 September 2012
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	Abstract:In long-reach RSOA based WDM-PON, the upstream transmission is impacted by the unavoidable Rayleigh backscattering because the downstram and upstream links share the same wavelength. To fix the impairment, a viable option is to separate the signal frequency spectrums of downstream and upstream. In this paper, a scheme of 100-km WDM-PON with 10Gbit/s high power efficient coded downstream signals and 2.5Gbit/s NRZ upstream signal is proposed and simulated. The performances of downstream and upstream are compared respectively when NRZ, RZ, IRZ or PPM code is used in downstream. And the relationship between the receive sensitivity of downstream/upstream and the extinction ratio of downstream signal is discussed definitively.
	TO cite this article:Wang Yanhong,Zhang Min. 100-km Long-Reach WDM-PON Using High Power Efficient On-Off Keying Codes in Downstream[OL].[ 5 September 2012] http://en.paper.edu.cn/en_releasepaper/content/4488293


	7. Dynamic Wavelength, Priority and Bandwidth Assignment (DWPBA) for Long-Reach Hybrid WDM/TDM-PON Based on Multi-thread Scheduling
	Yuqin Xie,Min Zhang
	Electrics, Communication and Autocontrol Technology 09 July 2012
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	Abstract:With the advances in optical technology, the span of the Passive Optical Network (PON) has been increased from the standard 20km to 100km. Wavelength-division multiplexing (WDM) has been recognized as the key technology in the next generation flexible and scalable passive optical network. WDM/time-division multiplexing (TDM)-PON is one of the candidates, which combine the WDM and TDM technology. In this paper, we propose an efficient DWPBA for Long-Reach hybrid WDM/TDM-PON by separating the Data and REPORT messages under multi-thread scheduling. We compare our proposed algorithm with the traditional algorithm, and show its advantages on packet delay. The results demonstrate that the DWPBA algorithm achieves high channel utilization and low packet delay when fiber length increased to 100 km.
	TO cite this article:Yuqin Xie,Min Zhang. Dynamic Wavelength, Priority and Bandwidth Assignment (DWPBA) for Long-Reach Hybrid WDM/TDM-PON Based on Multi-thread Scheduling[OL].[ 9 July 2012] http://en.paper.edu.cn/en_releasepaper/content/4484463


	8. Cross-Layer Resource Allocation of Two-Way Relaying for Statistical Delay-QoS Guarantees
	LIN Cen,LIU Yuan,TAO Meixia
	Electrics, Communication and Autocontrol Technology 02 February 2012
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	Abstract:This paper considers the cross-layer design for delayquality-of-service (QoS) provisioning in two-way relay systems. Theaim is to find the optimal cross-layer resource allocation policy tomaximize the weighted sum-rate of the considered two-way relaysystem while guaranteeing the bounded delay-QoS constraints for bothusers. By applying the concept of effective capacity, the delayrequirements are characterized as the statistical QoS exponents,which are the only information exchanged between layers. Thecross-layer optimization problem then is equivalent to a weightedsum effective capacity maximization problem. The optimal joint powerand rate adaptation policy for the two-phase two-way relaying isderived. Numerical results show that the proposed policy canefficiently support diverse QoS requirements and significantlyimprove the performance compared with either the fixed power schemeor the conventional weight-based method.
	TO cite this article:LIN Cen,LIU Yuan,TAO Meixia. Cross-Layer Resource Allocation of Two-Way Relaying for Statistical Delay-QoS Guarantees[OL].[ 2 February 2012] http://en.paper.edu.cn/en_releasepaper/content/4464801


	9. A Simple Energy Efficient Transceiver based on Constant-Envelop for IEEE 802.15.4
	Wang Chen ,Wenjie Wang,Qinye Yin
	Electrics, Communication and Autocontrol Technology 04 January 2012
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	Abstract:Efficient transmission has always been a major issue for wireless sensor networks (WSN) due to the fact that the nodes are usually battery-powered. Wireless communication accounts for a strikingly large proportion of the total power consumption of a node. In this paper, we reduce the power consumption in the physical layer by designing a low-power transceiver. IEEE 802.15.4 is a popular communication protocol with many good features that can be used for power-saving. We design a simple energy efficient transceiver for IEEE 802.15.4. It utilizes the constant-envelope feature of the offset quadrature phase shift keying (O-QPSK) signal with half-sine shaping defined in the protocol to simplify the structure of the transceiver. Compared with conventional transceivers, the proposed transceiver uses a hard-limiter (inverter) to replace the digital-to-analog converter (DAC) and the analog-to-digital converter (ADC), which results in a much simpler structure and lower power consumption. Furthermore, the correlation operation could be efficiently implemented just by a reversible counter. The performance of the proposed transceiver is effectively demonstrated by both computer simulations and hardware tests.
	TO cite this article:Wang Chen ,Wenjie Wang,Qinye Yin. A Simple Energy Efficient Transceiver based on Constant-Envelop for IEEE 802.15.4[OL].[ 4 January 2012] http://en.paper.edu.cn/en_releasepaper/content/4458831


	10. Doppler Frequency Offsets Estimation for High-Mobility OFDM Systems
	Guo Wei,Yin Qin-ye,Mu Peng-cheng
	Electrics, Communication and Autocontrol Technology 01 January 2012
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	Abstract:In this paper, the problem of multiple Doppler frequency offsets estimation for orthogonal frequency division multiplexing (OFDM) system over doubly-selective channels is investigated. The main application environment is for very high-mobility OFDM systems. The key point is to design a particular preamble structure. Then by remodeling the received blocks through downsampling, we compact parameter space and obtain a low complexity subspace-based estimator with the performance of high-resolution. The effectiveness of the proposed scheme is verified by simulations.
	TO cite this article:Guo Wei,Yin Qin-ye,Mu Peng-cheng. Doppler Frequency Offsets Estimation for High-Mobility OFDM Systems[OL].[ 1 January 2012] http://en.paper.edu.cn/en_releasepaper/content/4459101

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