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	1. Robust Distributed Beamforming For Time Asynchronous Cooperative Communications Systems
	Yin Shi-yuan,Wang Hui-ming,Yin Qin-ye,Xia Xiang-gen
	Electrics, Communication and Autocontrol Technology 11 October 2013
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	Abstract:A robust distributed beamforming approach for time asynchronous cooperative communications systems is developed. In this method, the effect of time-asychronization is considered. The minimum receiving SINR on the destination is maximized subject to the constraints that individual relay transmitted power is limited. This distributed beamforming problem is shown to be a quasi-convex problem and can be solved using semi-definite programming along with a bisection search method. Simulation results demonstrate that the proposed method is robust to the time-asychronization and its performance is better than both the MRC and the non-robust method.
	TO cite this article:Yin Shi-yuan,Wang Hui-ming,Yin Qin-ye, et al. Robust Distributed Beamforming For Time Asynchronous Cooperative Communications Systems[OL].[11 October 2013] http://en.paper.edu.cn/en_releasepaper/content/4563656


	2. Unsaturated throughput analysis of physical-layer network coding based on IEEE 802.11 distributed coordination function
	LIN Shijun,FU Liqun
	Electrics, Communication and Autocontrol Technology 05 September 2013
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	Abstract:In this paper, we investigate the throughputperformance of physical-layer network coding (PNC) under the IEEE802.11 distributed coordination function (DCF). We consider thewireless network that two client groups communicate with each otheracross one relay node, and focus on the unsaturated network case.The difficulty in modeling the relay systems under the IEEE 802.11DCF is that the minimum contention window sizes of the client nodesand the relay node may be different, which makes the traditionalthroughput analysis methods for the non-relay wireless networksinapplicable. Fortunately, we find that the relay system can bedecomposed into four parts and respectively modeled. Analyticalresults show that the throughput gain of PNC scheme is heavilyaffected by the probability that a transmitted network-coding (NC)packet contains the information of two packets. The implication isthat the throughput benefit of PNC is more significant forbidirectional isochronous traffic with rate requirements. We furtherderive an approximate closed-form solution of the optimaltransmission probability of client nodes that maximizes the PNCnetwork throughput. We validate our analytical model throughextensive simulations and discuss the relationship between the PNCnetwork throughput and other system parameters, such as the minimumcontention window sizes of both the client nodes and the relaynode.
	TO cite this article:LIN Shijun,FU Liqun. Unsaturated throughput analysis of physical-layer network coding based on IEEE 802.11 distributed coordination function[J].

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	3. Distributed Precoding with Weighted SLNR for Multi-User MIMO Systems
	Zhai Changliang,Zhang Yinghai
	Electrics, Communication and Autocontrol Technology 24 July 2013
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	Abstract: The use of precoding in the downlink of multi-user multiple-input multiple-output (MU-MIMO) systems can suppress co-channel interference effectively. Many schemes have been given to design precoding matrix for different optimization objective. In this paper, a distributed precoding scheme, named block diagonalization with weighted signal to leakage plus noise ratio (BD-WSLNR) for MU-MIMO systems with multiple data streams is proposed. It can nullify the intra-cell interference and mitigate the weighted leakage interference to other cell users according to their interference affordability based on channel quality information (CQI). Besides, a generalized singular value decomposition (GSVD) based matrix calculation method is introduced to improve the calculation accuracy and reduce the gap between effective SINRs of multiple data streams. Simulation results show that, compared to the existed schemes such as block diagonalization (BD), max signal to leakage plus noise ratio (max-SLNR), and block diagona-lization with other cell interference (BD-OCI), the proposed precoding scheme achieves considerable gains in the spectral efficiency of edge users, while maintaining nearly the same achievable sum-rate.
	TO cite this article:Zhai Changliang,Zhang Yinghai. Distributed Precoding with Weighted SLNR for Multi-User MIMO Systems[OL].[24 July 2013] http://en.paper.edu.cn/en_releasepaper/content/4552879


	4. The performance analysis of LDPC in MIMO Two-Way Relay Network under Nakagami-m Fading
	Yuanwei Liu,Shaosheng Li
	Electrics, Communication and Autocontrol Technology 08 July 2013
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	Abstract:the two LDPC decoding algorisms on MIMO with analogue network coding (ANC) in two-way amplify-and-forward (AF) relaying where multi-antenna nodes communicate via a single antenna relay are proposed. To be more specific, the simulation of the comparative analysis of un-coded and coded information in two-way relaying with non-identical Nagakgami-m fading between the hops is presented. To facilitate the comparison, we analysis the sum symbol error rate (SSER) of each MIMO case under Nakagami-m fading. And a pivotal conclusion is reached that as m and N increased, the SSER of the information is progressively reduced and Log Likelihood Ratio Belief Propagation (LLR BP) Based algorism is a little better than Modified (Uniformly Most Powerful Belief Propagation) UMP BP Based algorism within less than 1 dB in this model case.
	TO cite this article:Yuanwei Liu,Shaosheng Li. The performance analysis of LDPC in MIMO Two-Way Relay Network under Nakagami-m Fading[OL].[ 8 July 2013] http://en.paper.edu.cn/en_releasepaper/content/4549046


	5. Intelligent Library Bookshelf shuffling System based on RFID Technology
	Zheng Zhikan,Wang Dong
	Electrics, Communication and Autocontrol Technology 08 April 2013
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	Abstract:The work of maintaining the positions of each book in a big library has always been a very complicated and time consuming work. Since every people in the library, the librarian, the teachers, the students, can alter the positions of books randomly. Therefore, allocating a book in a big library is a difficult problem. RFID has been a promising technology since its infancy for inventory. And some indoor positioning application has been developed based on this platform. However, the previous work has been contributed to measure the Euclidean position of a RFID tagged item and the accuracy is under satisfactory compared to the small size of a book. In this work, we proposed a new method to locate a single book. It combines the empirical measurements with signal propagation modeling to determine book location and thereby enable book position notification service to readers. We present experimental results that demonstrate the ability of this method to estimate book location with a high degree of accuracy.
	TO cite this article:Zheng Zhikan,Wang Dong. Intelligent Library Bookshelf shuffling System based on RFID Technology[OL].[ 8 April 2013] http://en.paper.edu.cn/en_releasepaper/content/4529503


	6. Implementing Delay Tolerant Networks on Android Devices in Emergency Scenario
	WANG Yuchang,YU Chongxiu
	Electrics, Communication and Autocontrol Technology 12 March 2013
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	Abstract:?Mobile communication systems utilize fixed infrastructures to make sure an end-to-end connection. In some hostile environments, base-stations or access points may fail to work properly, the coverage range cannot reach seamless requirement either. Delay-Tolerant Network (DTN) is proposed to mitigate these problems. This paper analyses emergency scenario in order to make users interconnect without the infrastructures. By programming, it implements DTN on Android smartphones, where DTN nodes can be self-organized and transfer bundles in a single or multiple DTN regions. After investigating DTN architecture, routing strategies and DTN applications on multi platforms, it focuses on implementing voice communication function, neighbour discovery function and dynamic routing function, and enhances broadcast neighbour discovery process and list-exchanged epidemic routing algorithm. Testing is given to verify the above functions in two DTN regions. The results show a DTN node can transfer whatever it receives in one DTN region automatically to other DTN regions in a relatively long life time. By this way, DTN can accommodate the challenged environment and can be utilized in emergencies.
	TO cite this article:WANG Yuchang,YU Chongxiu. Implementing Delay Tolerant Networks on Android Devices in Emergency Scenario[OL].[12 March 2013] http://en.paper.edu.cn/en_releasepaper/content/4523736


	7. Graphic Based Frequency Planning and Distributed Power Allocationfor Relay-Aided OFDMA Cellular Networks
	Dong Miaomiao ,Yang Qinghai
	Electrics, Communication and Autocontrol Technology 11 March 2013
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	Abstract:In this paper, a novel inter-cell frequency planning scheme and distributed power allocation algorithm are conceived for relay-aided OFDMA cellular networks. The employed smart Relay Station (RS) is able to broadcast pilots to its connected Base Station (BS) and serving User Equipments (UEs) to evaluate the channel quality as well as to manage its accessed UEs. In order to reuse the subchannel among RSs in the RS-UE links, two different mechanisms are proposed to construct the global interference matrix, which interprets the reuse problem into a graphic based one. We further develop a Graphic Based Reuse Algorithm (GBRA) to solve the reuse problem. Furthermore, a distributed power allocation scheme is proposed for allocating the powers in the BS-RS and RS-UE links respectively aiming to maximize the system throughput under the UEs' rate constraints. Simulation results demonstrate that the proposed reuse scheme improves the system throughput significantly, through it results in a declined Signal Interference Noise Ratio (SINR). Meanwhile, the proposed power allocation algorithm further improves the system throughputs.
	TO cite this article:Dong Miaomiao ,Yang Qinghai . Graphic Based Frequency Planning and Distributed Power Allocationfor Relay-Aided OFDMA Cellular Networks[OL].[11 March 2013] http://en.paper.edu.cn/en_releasepaper/content/4526393


	8. 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


	9. On the frequency offset compensation in physical-layer network coding using OFDM
	WANG Zhou,XIE Gang,LI Xu
	Electrics, Communication and Autocontrol Technology 27 December 2012
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	Abstract:physical-layer network coding greatly improves the throughput in the two-way relay system. However, due to the difference between the two frequency offsets coming from two sources' transmitting signals and the fact that the signal at the relay node is overlapped, it is difficult to compensate the two different frequency offsets together. In the paper, this problem is analysied and a new method to calculate the compensation frequency offset based on golden section is put forward. Simulation results show that the algorithm has the same performance compared with the mean frequency offset compensation algorithm when the two signals from sources come through the symmetry channels, but in other cases that channels are not symmetry, the proposed algorithm will greatly improves the bit-error-rate(BER) performance of demodulated signal at the relay node.?????
	TO cite this article:WANG Zhou,XIE Gang,LI Xu. On the frequency offset compensation in physical-layer network coding using OFDM[OL].[27 December 2012] http://en.paper.edu.cn/en_releasepaper/content/4502260


	10. 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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