Abstract:In this paper, we investigate the carrier sensing range (CSR) of ageneral 802.11 network with physical-layer network coding (PNC). Weaim to derive a sufficient CSR that can prevent the hidden-nodecollisions in a general 802.11 PNC network. The analysis includestwo steps. First, we analyze the six link-to-link interference casesin an 802.11 PNC network to show that the mutual interference willbe most severe when each node in the network initiates a two-hop endnode link. Second, we consider the worst interference case that allconcurrently transmitting links in the network are two-hop end nodelinks and placed in the densest manner, and develop a closed-formexpression of a sufficient CSR that prevents the hidden-nodecollisions in a PNC network. From the analysis results, we find thatto prevent the hidden-node collisions, the CSR in PNC network shouldbe bigger than the one in traditional non-network-coding (NNC)network. Furthermore, we carry out extensive simulations to find outthe throughput gain of PNC scheme in a general wireless network whenconsidering the impact of CSR. Simulation results show that comparedwith the NNC scheme, PNC scheme has throughput gain when a largeproportion (i.e. 90%) of links in the network are two-hop links andthe link density has little effect on the throughput gain of PNCscheme.

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	1. Carrier sensing range analysis in a general IEEE 802.11network with physical-layer network coding
	LIN Shi-Jun, SHI Jiang-Hong
	Electrics, Communication and Autocontrol Technology 15 July 2014
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	Abstract:In this paper, we investigate the carrier sensing range (CSR) of ageneral 802.11 network with physical-layer network coding (PNC). Weaim to derive a sufficient CSR that can prevent the hidden-nodecollisions in a general 802.11 PNC network. The analysis includestwo steps. First, we analyze the six link-to-link interference casesin an 802.11 PNC network to show that the mutual interference willbe most severe when each node in the network initiates a two-hop endnode link. Second, we consider the worst interference case that allconcurrently transmitting links in the network are two-hop end nodelinks and placed in the densest manner, and develop a closed-formexpression of a sufficient CSR that prevents the hidden-nodecollisions in a PNC network. From the analysis results, we find thatto prevent the hidden-node collisions, the CSR in PNC network shouldbe bigger than the one in traditional non-network-coding (NNC)network. Furthermore, we carry out extensive simulations to find outthe throughput gain of PNC scheme in a general wireless network whenconsidering the impact of CSR. Simulation results show that comparedwith the NNC scheme, PNC scheme has throughput gain when a largeproportion (i.e. 90%) of links in the network are two-hop links andthe link density has little effect on the throughput gain of PNCscheme.
	TO cite this article:LIN Shi-Jun, SHI Jiang-Hong. Carrier sensing range analysis in a general IEEE 802.11network with physical-layer network coding[OL].[15 July 2014] http://en.paper.edu.cn/en_releasepaper/content/4604362


	2. Transmission Mode Switching for Device-to-Device Communication Aided by Relay Node
	NI Yi-Yang, QIAO Dan, LI Xiao, JIN Shi, ZHU Hong-Bo
	Electrics, Communication and Autocontrol Technology 05 June 2014
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	Abstract:In this paper, we investigate the strategy of transmission mode switching for device-to-device (D2D) communication in both single-cell scenario and multi-cell scenario, which selects the transmission mode to guarantee the maximum ergodic achievable sum-rate among three transmission modes. We first introduce the basic operation principles of three communication transmission modes which are named as traditional cellular communication mode, direct D2D communication mode and two-way DF relayed D2D communication mode. Then we derive the corresponding expressions for the ergodic achievable sum-rates of each transmission mode, and get the crossing points of different transmission modes to attain maximum ergodic achievable sum-rate of the system. From the analytical results, we can see that the proper operating region of each transmission mode is related to different interference level and distance of the D2D users. Based on the analytical results, we obtain a reliable communication transmission mode switching strategy which guarantees the system to choose the mode with the maximum ergodic achievable sum-rate so as to improve the performance of D2D communication. Numerical results demonstrate that by applying mode switching, the ergodic achievable sum-rate of the system achieves a remarkable enhancement.
	TO cite this article:NI Yi-Yang, QIAO Dan, LI Xiao, et al. Transmission Mode Switching for Device-to-Device Communication Aided by Relay Node[OL].[ 5 June 2014] http://en.paper.edu.cn/en_releasepaper/content/4599733

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	3. Design of Double Codebook Based on 3D Dual Polarized Channel for Multiuser MIMO System
	HAN Yu, JIN Shi, LI Xiao, HUANG Yong-Ming, JIANG Lei, WANG Gang
	Electrics, Communication and Autocontrol Technology 05 June 2014
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	Abstract:This paper proposes a precoding method based on double codebookfor multiuser three-dimensional multiple-input multiple-output (3D MIMO)system deployed with dual-polarized antenna array. Considering the block diagonal feature of the transmit correlation matrix of 3D dual-polarized channel, we adopt the double codebook structure, where the precoding matrix is comprised of an inner long-termmatrix and an outer short-term matrix. Then we introduce a set of 3D beams which possess good discrimination in horizontal and vertical domain to be the basic beam set, and adopt a topology describing 3D beam set to illustrate the angle information in an intuitive way. For the purpose of multiuser transmission, we also propose a corresponding limited channel information feedback scheme and a user scheduling criteria based on this double codebook structure. Simulation results demonstrate that the precoding method based on double codebook for dual-polarized 3D MIMO system effectively improves system throughput compared with 2D transmission scheme.
	TO cite this article:HAN Yu, JIN Shi, LI Xiao, et al. Design of Double Codebook Based on 3D Dual Polarized Channel for Multiuser MIMO System[OL].[ 5 June 2014] http://en.paper.edu.cn/en_releasepaper/content/4599730


	4. Performance Analysis of Cooperative Spectrum Sensing over Generalized Fading Channels
	Dian-Wu Yue,Francis C.M. Lau,Qian Wang
	Electrics, Communication and Autocontrol Technology 28 May 2014
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	Abstract:This paper analyzes the spectrum-sensing performance of a cooperative cognitive radio (CR) network consisting of a number of CR nodes and a fusion center (FC). A novel notation of "log-average-SNR ratio" is introduced in order to relate the average SNR of the CR-node-FC link and that of the primary-user-CR-node link. The sensing gain and the coding gain can be used to characterize the CR network performance at the high SNR region. Exact expressions for these two parameters are derived. Based on these expressions, ways to optimize the performance of the CR network can be determined.
	TO cite this article:Dian-Wu Yue,Francis C.M. Lau,Qian Wang. Performance Analysis of Cooperative Spectrum Sensing over Generalized Fading Channels[OL].[28 May 2014] http://en.paper.edu.cn/en_releasepaper/content/4599149


	5. Randomized space-time block coding for cooperative HF communication
	Dong Hao,Tang Bihua
	Electrics, Communication and Autocontrol Technology 26 December 2013
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	Abstract:This paper propose a novel scheme that increases the range and throughput in High Frequency (HF) communications using physical layer node cooperation. By exploiting multiple (and sufficiently spatial separated) power-constrained portable radios in a collaborative structure, it will be possible to obtain diversity gains similar to Multiple Input Multiple Output (MIMO) systems and therefore, to maximize link reliability, to increase communication range for a given throughput and power or, to increase throughput for a given range and power. This scheme is based on randomized space-time block coding (STBC) in the framework of distributed cooperative networks. In this paper, a short block Time-Reversal Space-Time Block Coding scheme (TR-STBC) combined with orthogonal frequency division multiplexing (OFDM) is presented to eliminate the doubly-selective fading of HF channel and, furthermore is compared though simulation to show the best performance among the three schemes we present. It's also observed that the diversity can be obtained by increasing the number of nodes. The proposed architecture will provide diversity gains that will improve the reliability of HF transmission with limited supporting infrastructure.
	TO cite this article:Dong Hao,Tang Bihua. Randomized space-time block coding for cooperative HF communication[OL].[26 December 2013] http://en.paper.edu.cn/en_releasepaper/content/4578679


	6. Pragmatic Quality of Experience Optimization for wireless multimedia applications on Intelligent Terminals
	Deng Zhiguo,Zhang Xin,Yang Dacheng
	Electrics, Communication and Autocontrol Technology 23 December 2013
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	Abstract:Wireless multimedia Quality of Experience (QoE) is not only a matter of Quality of Service (QoS). Network-based metrics such as delay, jitter and packet loss are critical indicators for multimedia service; but not well enough without considering the intelligent terminal-related metrics. This paper present a new QoE Evaluation Model which integrates application, network and terminal layers factors and works in a self-adaptive pattern for wireless applications on intelligent terminal. However, this is not the whole world for QoE. We further describe pragmatic strategies along with realistic application examples for Quality of Experience Optimization in mobile internet.
	TO cite this article:Deng Zhiguo,Zhang Xin,Yang Dacheng. Pragmatic Quality of Experience Optimization for wireless multimedia applications on Intelligent Terminals[OL].[23 December 2013] http://en.paper.edu.cn/en_releasepaper/content/4573545


	7. A Novel Positioning Algorithm Research for Emergency Rescue in WSN on Zigbee
	HU Zhiqiang
	Electrics, Communication and Autocontrol Technology 23 December 2013
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	Abstract:Wireless sensor network (WSN), which has drawn more and more attention, is considered to be well applied in various fields. Healthcare is one of these fields, while emergency rescue is a critical scenario in healthcare. In emergency rescue, personnel positioning is extremely needed as the injured should be found and get treatment in time so that more lives can be saved. Therefore, in this paper, the traditional positioning algorithm (TPA) is analysed and a new cellular wireless positioning algorithm (CWPA) is proposed, and the positioning performance of these two algorithms are compared through simulation. The results show that the new proposed algorithm can achieve a better positioning accuracy which should meet practical requirements.
	TO cite this article:HU Zhiqiang. A Novel Positioning Algorithm Research for Emergency Rescue in WSN on Zigbee[OL].[23 December 2013] http://en.paper.edu.cn/en_releasepaper/content/4577436


	8. A Self-adapting Interference Alignment Algorithm for Two-Cell Multiuser MIMO Interference Channels
	Zhang Xiao,Zhang Yinghai
	Electrics, Communication and Autocontrol Technology 12 December 2013
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	Abstract:Interference alignment (IA) is a potential interfe- rence management technology. As is known to us, IA can achieve the maximum spatial degrees of freedom (DOF) in MIMO interference channels. However, the perfect alignment condition, which is the necessary condition of IA, is not always existent. Once it does not exist, interference can not be completely aligned and part of interference leaks into the useful signal subspace. In this paper, we present a novel self-adapting interference alignment algorithm. In our algorithm, according to different alignment conditions, designing transmit beamforming matrices can be divided into two types. Especially, when the alignment condition is switched from perfect to imperfect, transmit beamforming matrices in the propose algorithm can not only eliminate the intra-cell inter-user interference (IUI) and the aligned inter-cell interference (ICI), but also mitigate the leaked ICI in the maximum extent. Finally, Simulations show that the proposed algorithm achieves the better performance in terms of sum rate.
	TO cite this article:Zhang Xiao,Zhang Yinghai. A Self-adapting Interference Alignment Algorithm for Two-Cell Multiuser MIMO Interference Channels[OL].[12 December 2013] http://en.paper.edu.cn/en_releasepaper/content/4568346


	9. A Tetrahedron Meshed Ray Tracing Method Based on Constrained Delaunay Tetrahedralization
	DING Haoyang,WEI Zaixue,MA Hengbiao,WEI Dan,SANG Lin,YANG Dacheng
	Electrics, Communication and Autocontrol Technology 28 October 2013
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	Abstract:Conventional ray tracing (RT) techniques face an obvious shortage of slow performance. Several acceleration methods have been proposed to address this problem and the tetrahedron meshed ray tracing (TMRT) method is verified superior to others in specific scenarios. In the TMRT method, Tetrahedralization is first required to preprocess the original scenario to trace rays through it. In this paper, we propose a TMRT method based on constrained Delaunay tetrahedralization. Compared with other RT method, the voxel method, we will see a marked acceleration effect of TMRT. We will also compare the CDT method with other tetrahedralization method to illustrate the impact of tetrahedralization on the TMRT acceleration effect in different scenarios.
	TO cite this article:DING Haoyang,WEI Zaixue,MA Hengbiao, et al. A Tetrahedron Meshed Ray Tracing Method Based on Constrained Delaunay Tetrahedralization[OL].[28 October 2013] http://en.paper.edu.cn/en_releasepaper/content/4565676


	10. On Outdoor Deployment of 60GHz Wireless Communication System
	Yu Xin,Wei Zaixue,Geng Jian,Yang Dacheng,Sang Lin
	Electrics, Communication and Autocontrol Technology 21 October 2013
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	Abstract:In recent years, the design of millimeter-wave wireless communication system has become a hotspot of academic and industrial research, for its broad and license-free spectrum. As the most of 60GHz wireless local area networking (WLAN) systems are deployed in the indoor environment, we investigate the coverage performance of the 60GHz WLAN system in a typical outdoor environment, and evaluate the feasibility of outdoor deployment of 60GHz system in this paper. First, an outdoor 60GHz WLAN system model based on IEEE 802.11ad is proposed. Then, the channel characteristics and antenna array gain at 60GHz are discussed and some comparisons are made with 2GHz. Furthermore, a typical crossroad scenario is simulated by a 3-dimensional ray tracing simulator in both 60GHz and 2GHz. The results of simulation show that, with the help of beamforming, the poor link budget of 60GHz system can be much enhanced. Finally, some conclusions of the 60GHz outdoor wireless system are given.
	TO cite this article:Yu Xin,Wei Zaixue,Geng Jian, et al. On Outdoor Deployment of 60GHz Wireless Communication System[OL].[21 October 2013] http://en.paper.edu.cn/en_releasepaper/content/4565303

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