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8th International Conference on Wireless Communications, networking and Mobile Computing (WiCOM)

作者： Kolani, Illa Zhang, Jie Gao Zehua State Key Laboratory Information Photonics and Optical Communications BUPT China Laboratory of Network System Architecture and Convergence BUPT China

ISBN: (纸本)9781612846835;9781612846828

Modeling MIMO time-variant channels as real world of wave propagation environments dictates, becomes crucial in wireless communication where an accurate knowledge about the channel state information is expected to be available for the transceivers. However instead of having unreliable and inefficiency instantaneous channel state information (CSI) where the feedback mechanisms often generate a delay in receiving information and thus the loss in throughput, a partial information can be obtained by means of the channel covariance. In this paper we have instigated a new scheme of modeling MIMO channel in terms of multiple rings scattering environments and the covariance estimated is determined on the basis of experimental results leaded. As application, we have considered the reliability of the link of the 2x2 MIMO multi ring scattering channel system. Without any precoding system which generally increases complexities in implementation, we provide its millimeter wave 60GHz channel's impact on the performances of the orthogonal space-time block code (OSTBC) and V- BLAST signaling which are shown to be close to that of uncorrelated channel.

关键词： MIMO OSTBC cell CSI.multi ring scattering millimeter wave V- BLAST

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Membrane-inspired quantum shuffled frog leaping algorithm for spectrum allocation

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Journal of systems Engineering and Electronics 2012年第5期23卷 679-688页

作者： Hongyuan Gao Jinlong Cao College of Information and Communication Engineering Harbin Engineering University Harbin 150001 E R. China Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing 100876 P. R. China

To solve discrete optimization difficulty of the spectrum allocation problem,a membrane-inspired quantum shuffled frog leaping（MQSFL） algorithm is *** proposed MQSFL algorithm applies the theory of membrane computing and quantum computing to the shuffled frog leaping algorithm,which is an effective discrete optimization *** the proposed MQSFL algorithm is used to solve the spectrum allocation problem of cognitive radio *** hybridizing the quantum frog colony optimization and membrane computing,the quantum state and observation state of the quantum frogs can be well evolved within the membrane *** novel spectrum allocation algorithm can search the global optimal solution within a reasonable computation *** results for three utility functions of a cognitive radio system are provided to show that the MQSFL spectrum allocation method is superior to some previous spectrum allocation algorithms based on intelligence computing.

关键词： quantum shuffled frog leaping algorithm membrane computing spectrum allocation cognitive radio

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A novel interference avoidance scheme based on blind polarization signal processing for cognitive Femtocell network

A novel interference avoidance scheme based on blind polariz...

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2012 15th International Symposium on Wireless Personal Multimedia Communications, WPMC 2012

作者： Lin, Xiaolin Guo, Caili Zeng, Zhimin Li, Dongming Laboratory of Network System Architecture and Convergence School of Information and Communications Engineering Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9789860334074

Femtocell technology has been recently proposed as a potential solution to improve spectrum efficiency. However, serious interference problem has also been brought in as well as the benefits. In this paper, a novel interference avoidance scheme based on blind polarization signal processing for cognitive Femtocell network is proposed. Femtocell network uses the polarization state which is orthogonal to the macrocell user (MUE) so as to avoid the interference to MUE. Cognitive Femtocell base station (FBS) obtains information from MUE firstly and then obtains polarization state for the whole Femtocell network with blind polarization signal processing without any prior information of channel between FBS and MUE. Polarized noise suppression method is also included to mitigate the random interference from additive white Gaussian noise to the arrived signal at FBS. Numerical simulation results show that the scheme can perform well under flat Rayleigh-fading channel. © 2012 NiCT.

关键词： Gaussian noise (electronic)

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A model for evaluating QoE of mobile Internet services

A model for evaluating QoE of mobile Internet services

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2012 15th International Symposium on Wireless Personal Multimedia Communications, WPMC 2012

作者： Luo, Yi Shou, Guochu Hu, Yihong Guo, Zhigang School of Information and Communication Engineering Beijing Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9789860334074

In recent years, with the increasingly intense competition in mobile Internet services, both network operators and application developers pay more and more attention to Quality of Experience (QoE). However, there is no universal QoE evaluation model and method for mobile Internet services. In this paper, we propose a universal QoE model and evaluation method for mobile Internet services from a mobile application perspective. The QoE value obtained through our model is the overall subjective feelings of end-users for a mobile application in specific network, instead of simple 'Excellent' or 'Good'. © 2012 NiCT.

关键词： Quality of service

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network video quality assessment based on measuring salient video features

Network video quality assessment based on measuring salient ...

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2012 15th International Symposium on Wireless Personal Multimedia Communications, WPMC 2012

作者： Shi, Zhiming School of Information and Communication Engineering Beijing Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9789860334074

In this paper, we explore the application of saliency information for perceptual quality assessment under different network environment. First we present an experiment to extract the saliency information of video under different network environment. Then we find there exists a relationship between the subjective experience and the video content features. M5' model tree, a data mining method, is good for segmental linearization of single-output multi-output system, was introduced to model the assessment method and its parameters. We combine multiple content features of video using M5' model tree. The final combined model improves the similarity between the subjective and objective assessment. © 2012 NiCT.

关键词： Data mining

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An opportunistic feedback scheme for downlink coordinated scheduling/beamforming

An opportunistic feedback scheme for downlink coordinated sc...

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2012 Computing, Communications and Applications Conference, ComComAp 2012

作者： Ning, Weidong Zhang, Tiankui Feng, Chunyan Zhao, Wenxiu Li, Yu-Ngok-Ruyue Beijing University of Posts and Telecommunications Beijing China Beijing Key Laboratory of Network System Architecture and Convergence Beijing China Advanced Wireless Research ZTE Corporation Shenzhen China

ISBN: (纸本)9781457717178

An opportunistic feedback scheme is proposed for reducing the uplink control information feedback for the coordinated scheduling/beamforming (CS/CB) mode in the coordinated multiple point (CoMP) systems. CoMP is a promising technology for LTE-Advanced to improve the coverage and the spectral efficiency. However, the total feedback load is substantially heavy and becomes a serious problem for the practical systems. The proposed opportunistic feedback scheme can reduce the feedback load with little user throughput deterioration. In the proposed feedback scheme, in each cooperating cells set, the cells are divided into one primary cell and several assistant cells. Users in the primary cell are fairly determined to feed back according to the normalized signal to interference plus noise ratio (SINR) threshold. In the assistant cells, users who cause less interference to the primary cell are supposed to feed back. The simulation results show that the proposed scheme reduces the feedback load magnificently, while keeping the performance loss minimal. © 2012 IEEE.

关键词： Cells

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Reducing feedback load for proportional fair scheduling in MIMO OFDM systems

Reducing feedback load for proportional fair scheduling in M...

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2012 Computing, Communications and Applications Conference, ComComAp 2012

作者： Zhao, Wenxiu Zhang, Tiankui Zeng, Zhimin Ning, Weidong Li, Yu-Ngok-Ruyue Beijing University of Posts and Telecommunications Beijing China Beijing Key Laboratory of Network System Architecture and Convergence Beijing China Advanced Wireless Research ZTE Corporation Shenzhen China

ISBN: (纸本)9781457717178

A feedback reduction scheme is proposed in multi-input multi-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems. The proposed scheme can reduce the feedback load of channel quality indicator (CQI) required for proportional fair scheduling at base station (BS). The probability distributions of instantaneous rate and average rate are studied. Then the distribution of proportional fair (PF) priority is obtained. Each user predicts the probability of being scheduled on the condition that its own PF priority is known. To reduce the amount of feedback load, a hard threshold of PF probability is designed for the CQI feedback reduction. This threshold is broadcast to all the users and only the users whose instantaneous PF priorities are higher than the threshold will feed back the CQI. The amount of feedback load saved by implementing the hard threshold is determined and the effect on the system throughput is analyzed. The simulation results show that the proposed scheme can reduce the feedback overhead while minimize the throughput loss. © 2012 IEEE.

关键词： Probability distributions

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Limited Feedback Bit Allocation for Cooperative Multi-cell systems with Multi- user MIMO

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China Communications 2012年第1期9卷 34-39页

作者： Shi Junfeng Zhang Tiankui Zeng Zhimin Laboratory of Network System Architecture and Convergence Key Laboratory of Beijing CityBeijing University of Posts and TelecommunicationsBeijing 100876P.R.China

For the cooperative multi-cell systems with muki-user MIMO, a new limited feedback bit allocation scheme is proposed to minimize the rate loss caused by quantization error. In the proposed scheme, the Channel State Information （CSI） feedback of cell-edge user for the local service cell and the adjacent interference cell are separately quantized. Based on the upper bound of the rate loss of cell-edge user due to the limited feedback, the number of feedback bits for quantized CSI of the local service cell and the adjacent cell are optimized with the fixed total bits of the limited feedback. The simulation shows that our proposed scheme of feedback bits allocation efficiently decreases the interference and increases the rate of systems compared with that of equal bits allocation and those of other allocations.

关键词： limited feedback Block Diagonalization（BD） precoding multi-cell multi-user MIMO

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The sub-channel allocation algorithm in femtocell networks based on Ant Colony Optimization

The sub-channel allocation algorithm in femtocell networks b...

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2012 IEEE Military Communications Conference, MILCOM 2012

作者： Liu, Deli Zhang, Haijun Zheng, Wei Wen, Xiangming Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China Centre for Telecommunications Research Kings College London London United Kingdom

ISBN: (纸本)9781467317290

Femtocell is an effective technology to improve the system performance. In this paper, we address the problem of sub-channels allocation in OFDMA two-tier femtocell networks. Our objective is to maximize the rate sum of multiple femtocells with consideration of cross-tier interference between macrocell and multiple femtocells. A resource optimization approach based on Ant Colony Optimization Algorithm is proposed to implement the solution process of system. Simulation results show that the proposed algorithms not only improve the capacity of the femtocell system but also provide good proportional fairness among the femtocell users, as compared with the traditional algorithm. © 2012 IEEE.

关键词： Femtocell

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Differentiated-pricing based power allocation in dense femtocell networks

Differentiated-pricing based power allocation in dense femto...

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2012 15th International Symposium on Wireless Personal Multimedia Communications, WPMC 2012

作者： Ma, Wenmin Zhang, Haijun Zheng, Wei Wen, Xiangming Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China Centre for Telecommunications Research King's College London London United Kingdom

ISBN: (纸本)9789860334074

Femtocells, combined with orthogonal frequency division multiple access (OFDMA), can improve cellular coverage and offload traffics from existing macrocells. However, the co-channel deployment of femtocells is still facing challenges arising from potentially severe co-channel interference in dense femtocells. In this paper, we investigate the uplink power allocation problem in dense deployed femtocells. We first model the uplink power allocation in femtocells as a non-cooperative game, where co-channel interference is taken into account in maximizing the femtocell capacity and uplink femto-to-femto interference is alleviated by charging each femto user a price proportional to the signal to interference and noise ratio (SINR). Based on the non-cooperative game, we then devise a distributed power allocation algorithm with differentiated pricing update. Simulation results show that the proposed power allocation algorithm is not only able to provide improved capacities for femtocells, but also can improve users' fairness, as compared with existing unpriced water filling power allocation algorithm. © 2012 NiCT.

关键词： Femtocell

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