Abstract:In this paper, the authors first review the increasing demand of broadband wireless communications for high-speed rail (HSR) and the challenges yet to be addressed. By developing and exploiting a dedicated radio environment map (REM) for high-speed rail, a novel cognitive radio (CR) approach is proposed to deal with the various challenging issues, such as fast channel estimation and adaptation under doubly selective fading, large Doppler spread, signalling storm and fatal communication disruption resulting from frequent group handover, coexistence and spectrum management issues. CR-based system architecture and cognitive signal processing algorithms are introduced for HSR broadband wireless communications, which have numerous benefits and advantages over the traditional approach. In addition, the REM-based cognitive channel estimation algorithm is proposed to acquire the channel coefficient efficiently and accurately. Simulations show that the performance of HSR broadband wireless communications can be improved significantly due to CR's situation awareness and learning capability by utilizing the comprehensive environmental information from a spatial-temporal database－REM. The parameters in the REM for HSR can be updated or fine-tuned through cognitive learning algorithms so that the performance of HSR broadband wireless communications can be continuously optimized along the repetitive movement of high-speed train on a fixed course. The CR approach presents a new paradigm for systems design and optimization of HSR broadband wireless communications.

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	1. Addressing the Challenges of Broadband Wireless Communications for High-Speed Rail - a Cognitive Radio Approach
	ZHAO Youping,LI Jinxing,HUANG Nannan,TAN Zhenhui
	Electrics, Communication and Autocontrol Technology 01 June 2016
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	Abstract:In this paper, the authors first review the increasing demand of broadband wireless communications for high-speed rail (HSR) and the challenges yet to be addressed. By developing and exploiting a dedicated radio environment map (REM) for high-speed rail, a novel cognitive radio (CR) approach is proposed to deal with the various challenging issues, such as fast channel estimation and adaptation under doubly selective fading, large Doppler spread, signalling storm and fatal communication disruption resulting from frequent group handover, coexistence and spectrum management issues. CR-based system architecture and cognitive signal processing algorithms are introduced for HSR broadband wireless communications, which have numerous benefits and advantages over the traditional approach. In addition, the REM-based cognitive channel estimation algorithm is proposed to acquire the channel coefficient efficiently and accurately. Simulations show that the performance of HSR broadband wireless communications can be improved significantly due to CR's situation awareness and learning capability by utilizing the comprehensive environmental information from a spatial-temporal database－REM. The parameters in the REM for HSR can be updated or fine-tuned through cognitive learning algorithms so that the performance of HSR broadband wireless communications can be continuously optimized along the repetitive movement of high-speed train on a fixed course. The CR approach presents a new paradigm for systems design and optimization of HSR broadband wireless communications.
	TO cite this article:ZHAO Youping,LI Jinxing,HUANG Nannan, et al. Addressing the Challenges of Broadband Wireless Communications for High-Speed Rail - a Cognitive Radio Approach[OL].[ 1 June 2016] http://en.paper.edu.cn/en_releasepaper/content/4695015


	2. Coordinator Assisted Geographical Routing Protocol for VANET in Urban Scenarios
	PENG Shi,ZHOU Jie-ying
	Electrics, Communication and Autocontrol Technology 28 April 2016
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	Abstract:This paper investigates the characteristics of the urban scenarios and motion law of VANET and proposes a position-based routing protocol CAGR (Coordinator Assisted Geographical Routing). Considering the characteristics of the urban scenarios, this protocol optimizes the traditional routing protocol of VANET by setting coordinating nodes in special places of the city road. Coordinating nodes calculate the SCORE value based on the distance from the path, the vehicle density and the path delay which will be used to select the best route to destination. At the same time, vehicles use the improved greedy strategy to forward packet on the road between coordinators. When data packet is transmitted to the coordinator, the protocol uses the M/M/C queuing model to optimize the parameters of the network. The experimental results indicate that CAGR protocol has better performance in complex urban scenarios.
	TO cite this article:PENG Shi,ZHOU Jie-ying. Coordinator Assisted Geographical Routing Protocol for VANET in Urban Scenarios[OL].[28 April 2016] http://en.paper.edu.cn/en_releasepaper/content/4685612

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	3. Cooperative Game and Relay Pairing\ in Cognitive Radio Networks
	HAO Lifeng
	Electrics, Communication and Autocontrol Technology 25 December 2015
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	Abstract:To optimize the overall utility of a cognitive radio networks (CRN), this paper focuses on cooperative spectrum access in a CRN, where secondary users (SUs) serve as relays for primary users (PUs) to improve their throughput, and in return SUs can gain transmission opportunities. this paper first investigates the cooperation between a single pair of PU and SU with Stackelberg game model, where PU determines access time allocation while SU determines relaying power for the PU. Based on the analytical results, cooperation pairing between multiple PUs and SUs is modeled as a bipartite matching problem and solved using extit{Gale-Shapley} algorithm. Numerical results demonstrate that, with the proposed schemes, overall utility for PUs and SUs can be balanced with low computational complexity.
	TO cite this article:HAO Lifeng. Cooperative Game and Relay Pairing\ in Cognitive Radio Networks[OL].[25 December 2015] http://en.paper.edu.cn/en_releasepaper/content/4673542


	4. The Effect of Repairing the Distorted OAM Beam With Changing the Gaussian Index of Deformable Mirrors
	YANG Xuan,YIN Xiaoli,GUO Xinlan,SANG Hongqing
	Electrics, Communication and Autocontrol Technology 05 December 2015
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	Abstract:As we know that deformable-mirror (DM) is used in the adaptive optics (AO) system to compensate the phase distortion of orbital angular momentum (OAM) beams transmitted in atmospheric turbulence. In the AO system, stochastic-parallel-gradient-descent (SPGD) algorithm is used to generate the phase correction pattern for distorted OAM beams. In order to improve spatial compensation capability for phase-front of distorted OAM beams, we focus on the Gaussian index of DM. By changing the value of the Gaussian index of DM, we make some analysis and get the best value of Gaussian index for 32-element DM to compensate the distorted OAM beam. This technique can be applied to AO system to improve the compensation capability.
	TO cite this article:YANG Xuan,YIN Xiaoli,GUO Xinlan, et al. The Effect of Repairing the Distorted OAM Beam With Changing the Gaussian Index of Deformable Mirrors[OL].[ 5 December 2015] http://en.paper.edu.cn/en_releasepaper/content/4668251


	5. Performance Analysis of Free-Space Optical Communications Link Using Multiplexing Orbital Angular Momentum States
	SANG Hongqing,YIN Xiaoli,HAO Ji,GUO Xinglan,YANG Xuan
	Electrics, Communication and Autocontrol Technology 04 December 2015
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	Abstract:Performance of free-space optics (FSO) link using multiplexing orbital angular momentum (OAM) states over non-Kolmogorov turbulent model is investigated in this paper. The probability of keeping the original OAM state after passing through the atmosphere turbulence has been estimated by the numerical analysis. We show that the detection probability of the original OAM state varies along with the topological charge of the transmitted OAM state, the aggregate capacity and per-channel bit-error rate are investigated to verify the influence imposed by the turbulence of the multi-OAM system.
	TO cite this article:SANG Hongqing,YIN Xiaoli,HAO Ji, et al. Performance Analysis of Free-Space Optical Communications Link Using Multiplexing Orbital Angular Momentum States[OL].[ 4 December 2015] http://en.paper.edu.cn/en_releasepaper/content/4668245


	6. Offline MIMO Equalization of Atmospheric Turbulence on the Propagation of Light Carrying Orbital Angular Momentum
	Guo Xinglan,Yin Xiaoli,Xin Xiangjun
	Electrics, Communication and Autocontrol Technology 04 December 2015
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	Abstract:We demonstrate crosstalk mitigation using 4 × 4 multiple-input-multiple-output (MIMO) equalization on an orbital angular momentum (OAM) multiplexed free-space data link in free-space optical communication links. For multiplexed OAM beams, atmospheric turbulence causes fluctuations of the received light signal, induces inter-channel crosstalk among each beam and degrades the signal performance, impairing link performance. We investigate its principle theoretically and verify it via simulation, the results demonstrate that with the assistance of MIMO processing, the Constellation diagram performance can be improved. Differernt MIMO equalization algorithms is compared, mathematical derivation and experimental simulation show that compared with CMA(Constant Modulus Algorithm), MCMA(modified Constant Modulus Algorithm) can improve the performance effectively and mitigate the channel crosstalk more effectively .
	TO cite this article:Guo Xinglan,Yin Xiaoli,Xin Xiangjun. Offline MIMO Equalization of Atmospheric Turbulence on the Propagation of Light Carrying Orbital Angular Momentum[OL].[ 4 December 2015] http://en.paper.edu.cn/en_releasepaper/content/4668529


	7. Energy Efficient Resource Allocation for Control Data Separation Architecture based H-CRAN with Heterogeneous Fronthaul
	Liu Qiang,Li Shao Qian,Wu Gang
	Electrics, Communication and Autocontrol Technology 02 December 2015
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	Abstract:In this paper, we study the optimization issue of network energy efficiency of the CDSA-based heterogeneous cloud radio access networks (H-CRAN) networks, which has heterogeneous fronthaul between control base station (CBS) and data base stations (DBSs). We first present a modified power consumption model for the CDSA-based H-CRAN, and then formulate the optimization problem with constraint of overall capacity of wireless fronthaul. We work out the resource assignment and power allocation by the convex relaxation approach Using fractional programming method and Lagrangian dual decomposition method, we derive the close-form optimal solution and verify it by comprehensive system-level simulation. The simulation results show that our proposed algorithm has $8%$ EE gain compared to the static algorithm, and the CDSA-based H-CRAN networks can achieve up to $16%$ EE gain compared to the conventional network even under strict fronthaul capacity limit.
	TO cite this article:Liu Qiang,Li Shao Qian,Wu Gang. Energy Efficient Resource Allocation for Control Data Separation Architecture based H-CRAN with Heterogeneous Fronthaul[OL].[ 2 December 2015] http://en.paper.edu.cn/en_releasepaper/content/4667801


	8. An adaptive MU/MS-MIMO detector for uplink CoMP and its FPGA implementation
	DONG Yue,ZHANG Kangle
	Electrics, Communication and Autocontrol Technology 10 November 2015
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	Abstract:CoMP is a promising technique in future wireless communication systems. But there have been few works focused on the implementation of CoMP detector. A novel architecture of adaptive MU/MS-MIMO detector is proposed in this letter. Based on this, an MU/MS-MIMO detector is implemented in FPGA, which is validated in a cooperative communication trial system. Results show that, the detector can work with high throughput in CoMP uplink and performs well in both single-user and multiuser scenarios.
	TO cite this article:DONG Yue,ZHANG Kangle. An adaptive MU/MS-MIMO detector for uplink CoMP and its FPGA implementation[OL].[10 November 2015] http://en.paper.edu.cn/en_releasepaper/content/4660915


	9. Clustering for coordinated zero-forcing beamforming in multiusers interference network
	HE Shengjie,CHUAI Gang
	Electrics, Communication and Autocontrol Technology 09 November 2015
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	Abstract:Traditional Zero-Forcing algorithm can eliminate the network interference effectively in small scale interference network. However, with the increasing number of users in practical communication system, this algorithm is not applicable any more. Due to lack of enough antennas, the channel matrix fails to provide sufficient dimensions to isolate the interference. In this paper, we design a clustering strategy for coordinated Zero-Forcing Beamforming (CZF) in multiusers interference network to improve it. Efficient clustering algorithm is derived to put users in disjoint clusters where CZF is applied to users within each cluster and the intercluster interference can almost be negligible compared to the whole network interference. Simulation results show that the proposed scheme enhances the capacity of network by 300% and the convergence within three iterations respectively.
	TO cite this article:HE Shengjie,CHUAI Gang. Clustering for coordinated zero-forcing beamforming in multiusers interference network[OL].[ 9 November 2015] http://en.paper.edu.cn/en_releasepaper/content/4660608


	10. Uplink and Downlink Area Spectral Efficiency of Two-tier Heterogeneous Cellular Networks
	Chen Wenping,Feng Zhiyong,Liu Baoling
	Electrics, Communication and Autocontrol Technology 05 November 2015
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	Abstract:Area spectral efficiency (ASE) is an important performance metric for cellular networks, which is typically studied under simple regular grid models. However, the regular grid model is not suitable for heterogeneous cellular networks (HCNs), since base stations (BSs) of each tier are randomly distributed with different power levels. Through stochastic geometry models, the ASE metric in a two-tier HCN consisting of macrocell BSs and picocell BSs is investigated in this study. Poisson point process distribution of BSs and splitted user association is assumed, which means that each user can associate to different BSs in uplink and downlink communications with improved throughput of HCNs. Both the uplink ASE based on Poisson Voronoi tessellation (PVT) and the downlink ASE based on weighted PVT are analyzed. Aiming at providing a tractable model and method to better characterize the performance of HCNs, the ASE metric is evaluated both through theoretical derivations and numeric simulations.
	TO cite this article:Chen Wenping,Feng Zhiyong,Liu Baoling. Uplink and Downlink Area Spectral Efficiency of Two-tier Heterogeneous Cellular Networks[OL].[ 5 November 2015] http://en.paper.edu.cn/en_releasepaper/content/4660165

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