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Nonbinary Multiple Rate QC-LDPC Codes with Fixed Information or Block Bit Length
Liu, Lei,Zhou, Wuyang,Zhou, Shengli The Korea Institute of Information and Commucation 2012 Journal of communications and networks Vol.14 No.4
In this paper, we consider nonbinary quasi-cyclic low-density parity-check (QC-LDPC) codes and propose a method to design multiple rate codes with either fixed information bit length or block bit length, tailored to different scenarios in wireless applications. We show that the proposed codes achieve good performance over a broad range of code rates.
Robust surface segmentation and edge feature lines extraction from fractured fragments of relics
Xu, Jiangyong,Zhou, Mingquan,Wu, Zhongke,Shui, Wuyang,Ali, Sajid Society for Computational Design and Engineering 2015 Journal of computational design and engineering Vol.2 No.2
Surface segmentation and edge feature lines extraction from fractured fragments of relics are essential steps for computer assisted restoration of fragmented relics. As these fragments were heavily eroded, it is a challenging work to segment surface and extract edge feature lines. This paper presents a novel method to segment surface and extract edge feature lines from triangular meshes of irregular fractured fragments. Firstly, a rough surface segmentation is accomplished by using a clustering algorithm based on the vertex normal vector. Secondly, in order to differentiate between original and fracture faces, a novel integral invariant is introduced to compute the surface roughness. Thirdly, an accurate surface segmentation is implemented by merging faces based on face normal vector and roughness. Finally, edge feature lines are extracted based on the surface segmentation. Some experiments are made and analyzed, and the results show that our method can achieve surface segmentation and edge extraction effectively.
Nonbinary Multiple Rate QC-LDPC Codes with Fixed Information or Block Bit Length
Lei Liu,Wuyang Zhou,Shengli Zhou 한국통신학회 2012 Journal of communications and networks Vol.14 No.4
In this paper, we consider nonbinary quasi-cyclic lowdensity parity-check (QC-LDPC) codes and propose a method to design multiple rate codes with either fixed information bit length or block bit length, tailored to different scenarios in wireless applications. We show that the proposed codes achieve good performance over a broad range of code rates.
Traffic-Aware Relay Sleep Control for Joint Macro-Relay Network Energy Efficiency
Na Deng,Ming Zhao,Jinkang Zhu,Wuyang Zhou 한국통신학회 2015 Journal of communications and networks Vol.17 No.1
With the ever growing demand of data applications, the joint macro-relay networks are emerging as a promising heterogeneous deployment to provide coverage extension and throughput enhancement. However, the current cellular networks are usually designed to be performance-oriented without enough considerations on the traffic variation, causing substantial energy waste. In this paper, we consider a joint macro-relay network with densely deployed relay stations (RSs), where the traffic load varies in both time and spatial domains. An energy-efficient scheme is proposed to dynamically adjust the RS working modes (active or sleeping) according to the traffic variations, which is called traffic-aware relay sleep control (TRSC). To evaluate the performance of TRSC,we establish an analytical model using stochastic geometry theory and derive explicit expressions of coverage probability, mean achievable rate and network energy efficiency (NEE). Simulation results demonstrate that the derived analytic results are reasonable and the proposed TRSC can significantly improve the NEE when the network traffic varies dynamically.
Proportional-Fair Downlink Resource Allocation in OFDMA-Based Relay Networks
Chang Liu,Xiaowei Qin,Sihai Zhang,Wuyang Zhou 한국통신학회 2011 Journal of communications and networks Vol.13 No.6
In this paper, we consider resource allocation with proportional fairness in the downlink orthogonal frequency division multiple access relay networks, in which relay nodes operate in decode-and-forward mode. A joint optimization problem is formulated for relay selection, subcarrier assignment and power allocation. Since the formulated primal problem is nondeterministic polynomial time-complete, we make continuous relaxation and solve the dual problem by Lagrangian dual decomposition method. A near-optimal solution is obtained using Karush-Kuhn-Tucker conditions. Simulation results show that the proposed algorithm provides superior system throughput and much better fairness among users comparing with a heuristic algorithm.
Proportional-Fair Downlink Resource Allocation in OFDMA-Based Relay Networks
Liu, Chang,Qin, Xiaowei,Zhang, Sihai,Zhou, Wuyang The Korea Institute of Information and Commucation 2011 Journal of communications and networks Vol.13 No.6
In this paper, we consider resource allocation with proportional fairness in the downlink orthogonal frequency division multiple access relay networks, in which relay nodes operate in decode-and-forward mode. A joint optimization problem is formulated for relay selection, subcarrier assignment and power allocation. Since the formulated primal problem is nondeterministic polynomial time-complete, we make continuous relaxation and solve the dual problem by Lagrangian dual decomposition method. A near-optimal solution is obtained using Karush-Kuhn-Tucker conditions. Simulation results show that the proposed algorithm provides superior system throughput and much better fairness among users comparing with a heuristic algorithm.