本期目录

2012年 19卷 4期 刊出日期：2012-08-31



Networks

Multiplicative multi-attribute auction based optimal network selection for heterogeneous wireless networks

翟兰杰 纪红 李曦

中国邮电高校学报(英文), 2012, 19 (4). doi： 10.1016/S1005-8885(11)60275-6

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One of the remarkable features of the next generation network is the integration of heterogeneous wireless networks, which enables mobile users with multi-mode terminals access to the best available network seamlessly. However, most of previous work only takes account of either maximizing single user’s utility or the whole network’s payoff, rarely considers the negotiation between them. In this paper, we propose a novel network selection approach using improved Multiplicative Multi-attribute Auction (MMA). At first, an improved MMA method is put forward to define the user’s utility. Additionally, user cost is defined by considering allocated bandwidth, network load intensity and cost factor parameter. And last the best suitable network is selected according to the user’s performance-cost-ration. Simulation results confirm that the proposed scheme outperforms the existing scheme in terms of network selection’s fairness, user’s performance-cost-ration, load balancing and the number of accommodated users.

Distributed channel assignment scheme combined with routing over Multi-Radio Multi-Channel Wireless Mesh Networks

袁飞飞 李旭 刘凯明 刘元安 杜潇 史信荣

中国邮电高校学报(英文), 2012, 19 (4). doi： 10.1016/S1005-8885(11)60276-8

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In order to realize the reduction of equipment cost and the demand of higher capacity, Wireless Mesh network (WMN) router devices usually have several interfaces and work on multi-channels. Jointing channel allocation, interface assignment and routing can efficiently improve the network capacity. This paper presents an efficient channel assignment scheme combined with the MR-LQSR routing protocol, which is called channel assignment with MR-LQSR (CA-LQSR). In this scheme, a physical interference model is established: Calculated Transmission Time (CTT) is proposed as the metric of channel assignment, which can reflect the real network environment and channel interference best, and Enhanced Weighted Cumulative Expected Transmission Time (EWCETT) is proposed as the routing metric, which preserves load balancing and bandwidth of links. Meantime, the expression of EWCETT contains the value of CTT, thus the total cost time of channel assignment and routing can be reduced. Simulation results show that our method has advantage of higher throughput, lower end-to-end time delay, and less network cost over some other existing methods.

Coverage and capacity optimization in LTE network based on non-cooperative games

许森 候萌 牛凯 贺志强 吴伟陵

中国邮电高校学报(英文), 2012, 19 (4). doi： 10.1016/S1005-8885(11)60277-X

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As one of the key use cases in Long Term Evolution Self-Organization Network (LTE SON), the coverage and capacity optimization (CCO) is the technology which provides the optimal coverage and capacity performance support high-data-rate service and decrease the operator capital expenditures (CAPEX) and operational expenditures (OPEX). In LTE system, some factors (e.g. load, traffic type, user distribution, uplink power setting, inter-cell interference and etc) limit the coverage and capacity performance. From the view of single cell, it always pursuits maximize performance of coverage and capacity by optimizing the uplink power setting and intra-cell resource allocation, but this may result in decreasing the performance of its neighbor cells. Therefore, the benefit of every cell conflicts each other. In order to tradeoff the benefit of every cell and maximize the performance for the whole network, this paper proposes a multi-cell uplink power allocation scheme based on non-cooperative games. The scheme aims to make the performance of coverage and capacity balanced by negotiation of the uplink power parameters among multi-cells. So the performance of every cell can reach the Nash equilibrium, making it feasible to reduce the inter-cell interference by setting an appropriate uplink power parameter. Finally, the simulation shows the proposed algorithm can effectively enhance the performance of coverage and capacity in LTE network.

Stability analysis in an AVQ model of Internet congestion control algorithm

詹振球 朱杰 徐迪

中国邮电高校学报(英文), 2012, 19 (4). doi： 10.1016/S1005-8885(11)60278-1

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This paper focuses on the local stability of a classical congestion control model in the Internet, namely AVQ (Adaptive Virtual Queue) algorithm with feedback delay. Firstly, necessary and sufficient stability conditions in terms of key tuning parameters are given, which can provide exact guidelines for setting system parameters. Furthermore, by computing the rightmost characteristic root, the optimal parameter configuration for AVQ is derived, which can guarantee superior stability performance. Finally, some simulation examples are given to illustrate the correctness of the theoretical analysis.

Enhanced calculation of necessary QoS for user satisfaction with a QoS mapping matrix

吴吉祥 夏靖波

中国邮电高校学报(英文), 2012, 19 (4). doi： 10.1016/S1005-8885(11)60279-3

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The final goal of quality of service (QoS) guarantees is to assure high quality of experience (QoE) for users. We cannot control QoE, but it is feasible to use QoS control schemes at lower levels to keep QoE high. We need to know the necessary QoS parameters values which need the minimum cost but could satisfy required QoE. An enhanced method is proposed to get the necessary quality of service (QoS) parameters which cost minimum but could satisfy required Quality of Experience (QoE) well. It abstracts the problem of obtain necessary QoS parameters to be how to get the solution of linear regression equations considering cost coefficient. The method establishes equations utilizing principal component analysis and multiple regression analysis based on normalized data. This paper defines the cost of necessary QoS and introduces the calculation of minimum cost necessary QoS parameter by inverse or generalized inverse matrix operations. The numerical example proves the normalization to be effective and the calculated values are feasible.

Stackelberg game theoretic pricing algorithm for bandwidth allocation in cooperative access

苗杰 HU Zheng ZHANG Yi-fan 桂丽 WANG Can-ru 田辉 YANG Kun

中国邮电高校学报(英文), 2012, 19 (4). doi： 10.1016/S1005-8885(11)60280-X

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Cooperative access among user devices by sharing wireless access bandwidth opens a new paradigm in heterogeneous networks. However, how to stimulate cooperative relay nodes forwarding service data for others and allocating corresponding bandwidth to support it are two key issues in the cooperative access. This paper proposes a Stackelberg game based framework which is benefit participants including relay nodes and client nodes. This framework generalizes the pricing based bandwidth allocation algorithm by the Stackelberg game model, which optimizes the profit of the cooperative relay nodes while guaranteeing the bandwidth requirements of client nodes. We transform the profit maximization problem into a convex problem and solve it using the convex optimization method. The simulation results demonstrate that the proposed framework and corresponding algorithms outperform the bidding weight proportional fairness and fixed value bandwidth allocation ones significantly.

Reducing bluetooth discovery time in collaborative working environment

高峰,Martin Hope,FAN Tong-rang,LIU Wen-hong

中国邮电高校学报(英文), 2012, 19 (4). doi： 10.1016/S1005-8885(11)60281-1

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The main aim of the research presented in this paper was to investigate ‘how to reduce the bluetooth discovery time in collaborative middleware based collaborative working environment (CWE), to enhance the communications of mobile users. The high level collaborative middleware is a research and technology development (RTD) challenge and one of most desirable medium to long term research outputs for CWEs. This research activity outlines a collaborative middleware module that has been developed on Smartphone technology and enables to reduce the discovery time of a multi-user collaborative working environment via a Bluetooth wireless communications network. To achieve this aim, it started with discussing the key design parameters, and then the design of collaborative middleware module with collaborative functionality; finally it is a comparison test to evaluate the impact of middleware. The result of the evaluation concludes the Bluetooth enabled collaborative middleware can reduce the discovery time in CWE

Wireless

Adaptive power control and beam-forming joint optimization in cognitive radio networks

褚红发 喻丹 李楠 牛凯 吴伟陵

中国邮电高校学报(英文), 2012, 19 (4). doi： 10.1016/S1005-8885(11)60282-3

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novel adaptive power control and beam-forming joint optimization algorithm is proposed in cognitive radio (CR) underlay networks, where cognitive network share spectrum with primary network which spectrum is licensed. In this paper, both primary base station (PBS) and cognitive base station (CBS) are all equipped with multi antennas, while each primary user (PU) and cognitive user (CU) has only one antenna. Different from traditional algorithms, an adaptive weight factor generating solution is supplied to different access users (both PUs and CUs) in this paper, and the different priority of users is also considered, because PUs have higher priority, the weight factor of PUs is fixed as constant and signal-to-interference and noise ratio (SINR) threshold is unchanged, while for CUs, it is set adaptively and SINR threshold is also changed accordingly. Using this algorithm, the transmit power is decreased, which relax the strict requirements for power amplifier in communication systems. And moreover, owing to PUS has fixed SINR threshold, the calculated SINR at receiver is nearly unchanged, but for CUs, the SINR is changing with the adaptive weight factor. Under the assurance of quality of service (QoS) of PUs, the solution in this paper can enable CRs access to the CR network according to adaptive SINR threshold, therefore which supplies higher spectrum utilization efficiency.

MMSE based joint Tomlinson-Harashima source and linear relay precoder design in non-regenerative MIMO relay system

李楠,CHEN Peng,HE Zhi-qiang,林家儒

中国邮电高校学报(英文), 2012, 19 (4). doi： 10.1016/S1005-8885(11)60283-5

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This paper proposes a joint nonlinear transceiver design scheme based on minimum mean square error (MMSE) criterion for non-regenerative multiple input multiple output (MIMO) relay system. The proposed scheme decomposes the error covariance matrix, reformulates the original joint design problem as two separate optimization problems, and then provides a closed-form solution with only local channel state information (CSI) available at the source and destination. Performance evaluation shows that the proposed scheme significantly outperforms linear schemes, and has a competitive performance compared with existing global CSI based nonlinear schemes, both iterative and non-iterative.

Tree pruning for MIMO sphere detection based on MMSE detection

王世良,孙松林,JING Xiao-jun,LU Yue-ming

中国邮电高校学报(英文), 2012, 19 (4). doi： 10.1016/S1005-8885(11)60284-7

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Tree pruning is an effective algorithm to reduce the complexity of sphere detection (SD) for multiple-input multiple-output (MIMO) communication systems. How to determine the tree pruning rule, as well as by what the tradeoff between the performance and the complexity can be achieved, is still an open problem. In this paper, a tree pruning algorithm is proposed based on minimum mean square error (MMSE) detection. The proposed algorithm first preforms MMSE detection since the complexity of MMSE detection is very low. Then the pruning constraints will be set according to the scaled path metrics of the MMSE solution. The choice of the scale factors and their influences on the complexity and performance are also discussed. Through analysis and simulations, it is shown that the complexity is reduced significantly with negligible performance degradation and additional computations.

Novel incremental relaying protocol based on spatial modulation

张铮 纪红 李屹 张鹤立

中国邮电高校学报(英文), 2012, 19 (4). doi： 10.1016/S1005-8885(11)60285-9

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This paper presents a novel incremental relaying protocol based on spatial modulation for cooperative transmission over quasi-static rayleigh fading channel, namely spatial modulation incremental relaying (SMIR), which applies the concept of spatial modulation into incremental relaying. In the proposed protocol, information bits are mapped into two information carrying units: 1) a constellation point in the constellation diagram and 2) the spatial domain, i.e. into the location of a particular cooperative user number. The analytical expression of the frame error rate (FER) for SMIR protocol is derived. Simulation results confirm the presented mathematical analysis and show that SMIR protocol gains 2 and 3 dB in signal to noise ratio (SNR) over the conventional protocol for 3- and 5-bit/symbol transmissions respectively. Moreover, under this protocol the system can achieve a much higher throughput, which means that our proposed protocol brings signi?cant gain in performance.

Q-learning for dynamic channel assignment in cognitive wireless local area network with fibre-connected distributed antennas

李屹 纪红

中国邮电高校学报(英文), 2012, 19 (4). doi： 10.1016/S1005-8885(11)60286-0

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Cognitive wireless local area network with fibre-connected distributed antennas (CWLAN-FDA) is a promising and efficient architecture that combines radio over fiber, cognitive radio and distributed antenna technologies to provide high speed/high capacity wireless access at a reasonable cost. In this paper, a Q-learning approach is applied to implement dynamic channel assignment (DCA) in CWLAN-FDA. The cognitive access points (CAPs) select and assign the best channels among the industrial, scientific, and medical (ISM) band for data packet transmission, given that the objective is to minimize external interference and acquire better network-wide performance. The Q-learning method avoids solving complex optimization problem while being able to explore the states of a CWLAN-FDA system during normal operations. Simulation results reveal that the proposed strategy is effective in reducing outage probability and improving network throughput.

Others

Full privacy preserving electronic voting scheme

庞雷 ,孙茂华, 罗守山, 王柏, 辛阳

中国邮电高校学报(英文), 2012, 19 (4). doi： 10.1016/S1005-8885(11)60287-2

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Privacy is an important issue in electronic voting. The concept of ‘full privacy’ in electronic voting was firstly proposed, not only the privacy of voters is concerned, but also the candidates’. Privacy preserving electronic election architecture without any trusted third party is presented and a general technique for k¬-out-of-m election based on distributed ElGamal encryption and mix-match is also provided. The voters can compute the result by themselves without disclosing their will and the vote of the losing candidates. Moreover, whether the vote of winner candidate is more than a half can be verified directly. This scheme satisfies ‘vote and go’ pattern and achieves full privacy. The correctness and security are also analyzed.

Improved certificateless multi-proxy signature

徐洁 孙洪祥 温巧燕 张华

中国邮电高校学报(英文), 2012, 19 (4). doi： 10.1016/S1005-8885(11)60288-4

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Multi-proxy signature is a scheme that an original signer delegates his or her signing capability to a proxy group. In the scheme, only the cooperation of all proxy signers in the proxy group can create a signature on behalf of the original signer. Jin and Wen firstly defined the formal security model of certificateless multi-proxy signature (CLMPS) and proposed a concrete CLMPS scheme. However, their construction has three problems: the definition of the strengthened security model is inaccurate, the concrete signature scheme has a security flaw, and the proof of the security is imperfect. With further consideration, a remedial strengthened security model is redefined, and an improved scheme is also proposed, which is existentially unforgeable against adaptively chosen-warrant, chosen-message and chosen-identity attacks in the random oracles. In this condition, the computational Diffie-Hellman (CDH) assumption is used to prove full security for our CLMPS scheme.

Active-fault-alarm enabled pre-protection scheme in 10G-EPON for smart power grid

白晖峰 汪波涛 王东山 李明维

中国邮电高校学报(英文), 2012, 19 (4). doi： 10.1016/S1005-8885(11)60289-6

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The active-fault-alarm (AFA) has been developed to achieve fast recovery of various network services, but the false-alarm still exists when applied to 10 Gigabit ethernet positive optical network (10G-EPON) in power grid. To solve this problem, an active fault alarm based pre-protection (AFA-PP) scheme in 10G-EPON system for power grid is proposed in this paper. The AFA-PP scheme experimental results suggest the better performances of the new mechanism and show that the AFA-PP can solve the false-alarm problem efficiently. takes full advantage of the AFA technologies, and allows conducting pre-protection operation in advance. Analytical and

Novel high-resolution DOA estimation using subspace projection method

司伟建, 蓝晓宇,ZOU Yan

中国邮电高校学报(英文), 2012, 19 (4). doi： 10.1016/S1005-8885(11)60290-2

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The performance of multiple signal classification (MUSIC) algorithm with regard to solving closely spaced direction of arrivals (DOAs) depends strongly upon the signal-to-noise ratio (SNR) and snapshots. In order to solve this problem, a method by reconstructing the spatial spectrum function with both noise subspace and signal subspace is presented in this paper. The key idea is to apply the full information contained in covariance matrix and change the projection weights of steering vector on the noise and signal subspace by their revised eigenvalues, respectively. Comparing with the MUSIC algorithm, it does not increase any computational complexity either, and remarkably, it has the advantages of simultaneously reducing noise and keeping the high-resolution ability under low SNR and small sample sized scenarios. Simulation and experiment results are included to demonstrate the superior performance of the proposed algorithm

Construction of parallel and distributed static simulation system based on augmented reality

张金玲

中国邮电高校学报(英文), 2012, 19 (4). doi： 10.1016/S1005-8885(11)60291-4

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This article puts forward a kind of parallel and distributed static augmented scene system structure to improve the performance of real time augmented simulation system. Based on static registration technique, several groups of processing nodes do parallel scene pictures taking, 3D registration and virtual-real merging. Process on different nodes is controlled by uniform synchronization mechanism and network transmitting. Wide field of view image can be obtained from image mosaic operation and displayed by wide view display system. Detailed system architecture, registration algorithm, method how to determine camera position and synchronization mechanism between each process node are introduced. The experiment result can validate the good performance of the designed system.