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检索条件"机构=Beijing Key Laboratory for Network System Architecture and Convergence"

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Lattice code design criterion for MIMO wiretap channels

Lattice code design criterion for MIMO wiretap channels

引用

IEEE (first ITW conference of the year) Information Theory Workshop (ITW)

作者： Hamed Mirghasemi Jean-Claude Belfiore Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

We consider the MIMO wiretap channel, where a legitimate transmitter (Alice) wishes to communicate a confidential message to the legitimate receiver (Bob) over a MIMO channel, while its messages are being eavesdropped by Eve through another MIMO channel. Supposing that Alice uses the nested lattice code proposed in [8], we characterize the expected value of amount of information leakage to Eve, and from minimizing this expected value, we derive a code design criterion for MIMO lattice wiretap codes. The special cases of block and fast fading channels are also studied. We also illustrate our lattice code design criterion using the Alamouti Code as the simplest MIMO code available in the literature.

关键词： Lattices MIMO Fading Upper bound Encoding Gaussian distribution Receivers

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Innovative practices session 7C: Mixed signal test and debug

Innovative practices session 7C: Mixed signal test and debug

引用

VLSI Test Symposium

作者： Suriya Natarajan Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

The traditional focus of work in test has been innovation and efficiency for high volume manufacturing test. However, in reality, a significant amount of effort is expended on design validation and debug prior to deeming analog and high speed serial IO test stimuli content production worthy. In this presentation we emphasize the importance of widening the post-silicon envelope to include early design validation and debug in addition to manufacturing test. The impact on DFX architecture is considered in which in order to be efficient the architecture has to be scalable across a wider set of post-silicon stages. We also discuss the need for establishing quick correlation between design validation and manufacturing test measurements and the time-to-market savings it brings for analog and IO content designed essentially on a digital process technology.

关键词： Manufacturing Calibration Production Mobile communication Safety Testing Delays

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Joint dynamic point blanking and ABS for ICIC in cloud cooperated heterogeneous network

Joint dynamic point blanking and ABS for ICIC in cloud coope...

引用

IEEE International Conference on Communications in China (ICCC)

作者： Mei Wang Hailun Xia Chunyan Feng Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

To mitigate cross-tier interference, almost blank subframe (ABS) has been exploited for heterogeneous networks (HetNet). Macrocells mute or reduce transmission power to avoid interference to picocell edge users. However, the former results in unfairness between macrocells and picocells, and the latter fails to acquire a prominent improvement in energy efficiency (EE). In this paper, a time and frequency domain interference coordination is proposed. Dynamic Point Blanking (DPB) is introduced into ABS scheme to reach a tradeoff between fairness and EE. In time domain, macrocells reduce transmission power during ABSs. In frequency domain, DPB scheme dynamically mutes the strongest interference of coordinated points to further mitigate interference. When the novel DPB is adopted, firstly, the muting pattern is designed to determine DPB users according to coordination. Then a cloud cooperated cellular network (C-HetNet) is introduced, in which small power nodes under a macrocell are connected to cloud radio access network (C-RAN) to operate with the macrocell. C-RAN mutes some macrocells' resource blocks (RBs) used by DPB users. The simulation results demonstrate that the proposed DPB-ABS scheme can increase the total network EE excellently while ensuring fairness between macrocells and picocells.

关键词： Wireless communication

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Combination of spectrum allocation and multi-relay selection in overlay cognitive radio network

Combination of spectrum allocation and multi-relay selection...

引用

IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Yanbo Wang Caili Guo Xuekang Sun Chunyan Feng Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

In overlay cognitive radio network, the available spectrum for secondary users are dynamically grabbed from a wideband of hundreds megahertz by spectrum sensing, which leads to remarkably differential path loss among different frequencies according to propagation theory. Adjusting the global path loss of cognitive relay system through spectrum allocation can serve nontrivial increment to the performance of multi-relay selection. In this paper, we propose a novel scheme combining multi-relay selection with spectrum allocation in the cognitive radio relay system to obtain maximum signal to noise ratio (SNR) at the receiver, called SAMS (spectrum allocation and multi-relay selection). Given the available frequencies, we first search all the possible resolutions for spectrum allocation, then make multi-relay selection under each possible spectrum allocation resolution to optimize the SNR value at the receiver. Finally, we choose the largest SNR, achieve the corresponding spectrum allocation resolution and also figure out the selected relays. Compared with conventional multi-relay selection scheme (CMS), simulation results demonstrate that our proposed scheme has a 4dB-increment of SNR value at the receiver.

关键词： Relays Resource management Cognitive radio Receivers Signal to noise ratio Fading Radio spectrum management

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Vertical handoff decision algorithm in heterogeneous wireless network based on queuing theory

Vertical handoff decision algorithm in heterogeneous wireles...

引用

International Conference on Advanced Communication Technology (ICACT)

作者： Yong Sun Beijing University of Posts and Teleoommunications Beijing China Beijing Key Laboratory of Network System Architecture and Convergence

ISBN: (纸本)9781467381161

A smart vertical handoff decision algorithm based on queuing theory is proposed in this paper. Vertical handoff in heterogeneous wireless network is crucial to the future wireless communication. The algorithm formulates the heterogeneous wireless area and handoff procedure using queuing theory and proposes a new network selection index called new handoff blocking probability to evaluate the network performance. A RSS-based mechanism is considered to avoid the Ping-Fong effect. Also the network architecture is regulated to manage the wireless resource effectively. The experimental results show that the proposed algorithm outperforms the traditional algorithm with low handoff blocking probability and a better load balance of the whole wireless environment.

关键词： Manganese Wireless networks Wireless LAN Queueing analysis Mobile communication

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Joint clustering-based resource allocation and power control in dense small cell networks

Joint clustering-based resource allocation and power control...

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IEEE International Conference on Communications in China (ICCC)

作者： Yalan Zhao Hailun Xia Zhimin Zeng Shie Wu Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9781509002443

Cell range expansion (CRE) technique has been introduced into heterogeneous networks (HetNet) to perform load balance. However, small cell CRE user equipments (UEs) may suffer severe downlink (DL) co-tier interference and cross-tier interference in dense small cell environment. In this paper, we present a joint clustering-based resource allocation and power control scheme to mitigate interference CRE UEs suffer. Firstly, we divide the dense small cells into different clusters by the graph coloring algorithm (GCA). Then we coordinate frequency resource allocation among different clusters and macrocells, which can better reuse resource blocks (RBs). After that, SBSs in some clusters reduce power to mitigate the co-tier interference. Meanwhile, in order to alleviate the cross-tier interference, a utility function combining interference and throughput is calculated to find the optimal transmission power of macro base stations (MBSs) by differential evolution (DE) theory. Finally, simulation results demonstrate that the proposed scheme can significantly improve the CRE UEs throughput with slight sacrifice of the macro throughput.

关键词： Interference Macrocell networks Resource management Power control Throughput Microprocessors Computer architecture

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Stochastic geometry based energy-efficient base station density optimization in cellular networks

Stochastic geometry based energy-efficient base station dens...

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IEEE Conference on Wireless Communications and networking

作者： Lu An Tiankui Zhang Chunyan Feng SICE Beijing University of Posts and Telecommunications Beijing Key Laboratory of Network System Architecture and Convergence Beijing China

ISBN: (纸本)9781479984077

In the research of green networks, considering the base station (BS) density from the perspective of energy efficiency is very meaningful for both network deployment and BS sleeping based power saving. In this paper, we optimize the BS density for energy efficiency in cellular networks by the stochastic geometry theory. First, we model the distribution of base stations and user equipment (UE) as spatial Poisson point process (PPP). Based on such model, we derive the closed-form expressions of the average achievable data rate, the network energy consumption and the network energy efficiency with respect to the network load. Then, we optimize the BS density for network energy efficiency maximization by adopting the Newton iteration method. Our study reveals that we can improve the network energy efficiency by deploying the suitable amount of BSs or switching on/off proportion of the BSs according to the network load. The simulation results validate the theoretical analysis, and show that when the right amount of BSs is deployed according to the network load, the network energy efficiency can be maximized and the maximum energy efficiency is a fixed value once the network parameters are given.

关键词： Energy efficiency Power demand Base stations Energy consumption Mathematical model Fading Simulation

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Experimental study on wirless interference in RFID system

Experimental study on wirless interference in RFID system

引用

11th International Conference on Wireless Communications, networking and Mobile Computing (WiCOM 2015)

作者： Yang Fu Weijun Hong Shufang Li Jie Zou Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications BUPT China

ISBN: (纸本)9781510821279

The objective of the proposed work is to find the effects on the reading performance of 900 MHz radio frequency identification system (RFID) under the wireless interference. Experiments were carried out in full anechoic chamber avoiding the influence of wireless signal produced by the reflection. In order to simplify the analysis of the process of performance, single tone signal was selected as the source of wireless interference. The performance was measured in terms of change in the successful reading rate of tags and the interrogation range of the reader. Typically the performance of the RFID will decline due to the wireless interference. However in our experiment it was found that the unwanted signal can significantly improve the performance of RFID system when its power reaches a certain range. To explain this phenomenon, we analyze the tag circuit as well as the back-scatter link, and the ratio m was defined to characterize the degradation of reading performance. It was concluded that the results we calculate using the method we proposed was matched with the experimental results.

关键词： Back-Scatter Link Performance RFID Ultra High Frequency Wireless Interference Ultrahigh frequencies Radio Frequency Identification Device Radio frequency identification RFID system unwanted signal wireless Proposed works

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The global flow table based on the Software-Defined networking

The global flow table based on the Software-Defined Networki...

引用

2015 International Conference on Communication Problem-Solving(ICCP)

作者： Qiuzheng Ren Xiaofeng Qiu Pengcheng Chen XiaoDong Liang Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications

With the rapid development of SDN, its security problem is increasingly outstanding. Because of the openness and intelligence of SDN, the flow can be dispatched and controlled globally by the network controller. However there is not a mechanism that provides a clear visibility of the distribution,path and traffic of the whole network flows for the security equipment. Now many security detection methods need to know the distribution and behaviors of the global flows. So the paper proposes a new mechanism named global flow table and corresponding algorithms to realize the global flows' collection, the whole network flow path computation and global flows *** method can provide both the global details of the whole network topology and the key information of per flow mentioned above conveniently and directly for the security equipment. And we also design a structure to store the details of all flows. Then we analyze the time performance of the algorithm theoretically. The experimental result verifies the theoretical analysis and concludes that the algorithm has a good time performance. The primary affecting factors of the algorithm are the number of the flow tables and the ratio of the links to the switches.

关键词： SDN Open Flow flow table global flow path

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Building Entry Loss Model for 24 to 31GHz band

Building Entry Loss Model for 24 to 31GHz band

引用

International Symposium on Antennas and Propagation

作者： Bolun Guo Yong Wu Jian Jiao Boya Lv Feng Zhou Zhen Ma Jing-lu Sun Wireless Research Department Huawei Technologies Co. LTD Beijing China China Academy of Information and Communication Technology Beijing China Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunication Beijing China

The millimeter wave is considered as one of the most important resources for the IMT system towards to the 5G. In this paper, building entry loss model of typical office building is studied. The characteristics are an... 详细信息

ISBN: (纸本)9781467379601

关键词： Millimeter wave Penetration loss building entry loss

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