本期目录

2016年 23卷 1期 刊出日期：2016-02-26



Networks

Research of the multi-way connectivity probability for platoon-based Vehicle-to-Infrastructure communication network

邵彩幸 张建华

中国邮电高校学报(英文), 2016, 23 (1). doi： DOI: 10.1016/S1005-8885(16)60001-8

摘要 ( 2048 ) PDF (1033 KB)( 325 )

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Vehicles travelling as platoons can reduce the huge traffic jams on the highway. Platoon members can share vehicle information such as speed and acceleration via vehicular ad hoc networks (VANETs) communication to maintain a constant inter-vehicle and inter-platoon distances. However, connectivity is a fundamental measurement to indicate the linking quality of VANETs. This paper analyzes the access and connectivity probability between the vehicles and the road side units (RSUs) of the multi-way platoon-based VANETs with roadside infrastructure. We denote the connectivity probability as the probability that the vehicles on the highway can access to at least one RSU besides the road within a designated number of hops. Moreover, besides considering the connection on the same road, we study the connection between the vehicles and the RSU via vehicles on the nearby neighbor roads. The analytical results have been validated by simulations and results show that the connectivity probability can be improved when there are platoons in a network. Meanwhile, the connectivity probability is higher in the multi-way vehicle-to-infrastructure (V2I) communication network than that in a one-way V2I communication network. The results in this paper can help to reduce the jams on the highway and achieve intelligent driving. Then the safety and comfort of the drivers and passengers on the highway can be improved. Moreover, these results can provide forceful theoretical support to the future intelligent transportation system (ITS) design.

Achievement of Bluetooth adaptive packet selection strategies based on SNR estimation

李晶 陈万忠 赵晓晖

中国邮电高校学报(英文), 2016, 23 (1). doi： DOI: 10.1016/S1005-8885(16)60002-X

摘要 ( 2020 ) PDF (423 KB)( 260 )

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It is necessary to estimate channel quality in order to put Bluetooth adaptive packet selection strategies into practice. However, the current Bluetooth channel quality estimation algorithms are either poor at timeliness or not applicable to systems which only support basic rate (BR) data packets (Gaussian frequency shift keying (GFSK) modulation scheme). It is investigated to apply the channel quality estimation algorithm based on power spectrum to Bluetooth adaptive packet selection strategies in this paper. Simulation results and analysis show that the proposed channel quality estimation algorithm based on power spectrum can achieve the accuracy less than 0.2 dB in the estimation range required by Bluetooth adaptive packet selection strategies. It has simple calculation and strong timeliness. The algorithm can also be suitable for different modulation schemes of Bluetooth data packets. It provides a good precondition for the achievement of Bluetooth adaptive packet selection strategies.

Low-Cost FPGA Implementation of 2D Digital Predistorter for Concurrent Dual-Band Power Amplifier

曾光 于翠屏 Li Shu-lan 刘元安

中国邮电高校学报(英文), 2016, 23 (1). doi： DOI: 10.1016/S1005-8885(16)60003-1

摘要 ( 1982 ) PDF (2797 KB)( 331 )

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This paper proposes a low-cost hardware architecture based on concurrent dual-band digital pre-distorter (DPD). The architecture is implemented on field programmable gate array (FPGA) to compensate for the nonlinearity of the concurrent dual-band power amplifier (PA). This implementation introduces a novel model complexity reduction technique into system, namely, time-division multiplexing for out-of-band lookup tables (LUTs) sharing. Performances are evaluated with an experimental test setup using a wideband class-F PA. The dual-band signal center frequency separated by 80 MHz. Lower and upper center frequency are located at 2.61 GHz and 2.69 GHz, respectively. This novel DPD implementation maintains excellent performance, but uses hardware resources reduced by 29.17% compared with conventional approaches. The results show that the adjacent channel power ratio (ACPR) is less than 59 dBc and normalized mean square error (NMSE) is around 62dB for lower sideband (LSB) and 63dB for upper sideband (USB).

Image compression scheme based on PCA for wireless multimedia sensor networks

周威 孙力娟 郭剑 刘林峰

中国邮电高校学报(英文), 2016, 23 (1). doi： DOI: 10.1016/S1005-8885(16)60004-3

摘要 ( 2052 ) PDF (2136 KB)( 277 )

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In combination of the characteristic of the network architecture of wireless multimedia sensor networks (WMSNs), a distributed multi-node cooperative network (DMCN) model is designed by using the concept of in-network processing to improve their energy, memory and computational power. To balance the energy consumption of the network, according to roles division, camera nodes and common nodes are cooperated to accomplish the workload of image acquisition, compression and transmission. Camera nodes gather images and send blocking images to the common nodes in cluster. Common nodes adaptively compress the partitioned images by using a noise-tolerant distributed image compression (NDIC) algorithm based on principal component analysis (PCA) called NDIC-PCA algorithm and send the compressed data to the cluster head node. Then, the cluster head node sends the compressed image data to the station. Simulation results demonstrate that, DCNM can effectively balance the energy consumption of network and largely extend the network lifecycle. In addition, compared with previous algorithms, the proposed NDIC-PCA algorithm achieves higher peak signal to noise ratio without decreasing compression ratio.

Simulation analysis on co-site interference of vehicular digital communication system based on IM prediction method by BER

周萍 吕英华 陶勇 徐洪平

中国邮电高校学报(英文), 2016, 23 (1). doi： DOI: 10.1016/S1005-8885(16)60005-5

摘要 ( 2086 ) PDF (566 KB)( 338 )

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The co-site interference exists in kinds of communication systems, especially in digital communication systems, also is one of the biggest threats in electromagnetic compatibility (EMC) designation of the systems. Analyzing the co-site interference is an important process in achieving EMC performance of the system. Under the situation, the co-site interference simulation analysis of a vehicular digital communication system based on interference margin (IM) prediction method by bit error ratio (BER) was proposed in the paper. In the simulation analysis, some physical models of the vehicular communication system were established on SIMULINK environment, the upper limit of BER level for audio signals was defined as the IM, three different types of co-site interference was analyzed respectively, and the simulation results were obtained in the form of system interference bandwidth. From these results, the EMC performance evaluation of the vehicular communication system was predicted based on the IM prediction method. By comparing with the actual test results, the correctness of the simulation results was validated and the simulation analysis method can be used for reference by other communication systems was indicated.

Blind spectrum sensing based on the ratio of mean square to variance

叶迎晖 卢光跃

中国邮电高校学报(英文), 2016, 23 (1). doi： DOI: 10.1016/S1005-8885(16)60006-7

摘要 ( 1804 ) PDF (442 KB)( 266 )

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Anderson-Darling (AD) sensing, Characteristic Function (CF) sensing and Order Statistic (OS) sensing are three common spectrum sensing methods based on goodness of fit (GOF). However, AD and OS sensing needs the prior information of noise variance; CF and OS sensing have high computation complexity. To circumvent those difficulties, in this paper, the ratio of the mean square to variance (RM2V) of the samples, after deriving its probability density function (PDF), is employed as a test statistic to detect the availability of the vacant spectrum in the cognitive radio system. Then a blind spectrum sensing method based on RM2V is proposed, which is dubbed as RM2V sensing, and its exact theoretical threshold is obtained via the derived PDF of RM2V. The performance of RM2V sensing is evaluated by theoretical analysis and Monte Carlo simulations. Comparing with the conventional energy detection, AD, CF and OS sensing, RM2V sensing, with no need of noise variance, has advantages from the aspect of computation complexity and detection performance.

Location-Aided and Secure Routing Protocol for Heterogeneous Multi-hop Wireless Networks

白媛 郝瑞敏 安杰 张会兵

中国邮电高校学报(英文), 2016, 23 (1). doi： DOI: 10.1016/S1005-8885(16)60007-9

摘要 ( 1689 ) PDF (400 KB)( 308 )

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Intelligence

On limit cycle chattering in sliding mode control systems under the influence of sampling intervals based on DF approach

亢红波 申宇

中国邮电高校学报(英文), 2016, 23 (1). doi： DOI: 10.1016/S1005-8885(16)60008-0

摘要 ( 1890 ) PDF (863 KB)( 235 )

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为分析采样间隔对一类滑模抖振的影响，利用一种广义描述函数(DF)法，在频域上研究离散滑模控制系统的抖振特性。根据极限环的存在条件，系统的幅相频率特性曲线表明在滑模控制中存在一个非稳定的和两个稳定的极限环。通过精确测量，可估计极限环抖振的幅度和频率。数值仿真验证了广义DF法的抖振参数估计精度。仿真曲线表明从不同初值出发的系统相轨迹可收敛于一大一小两个极限环。

Affinity-based Human Mobility Pattern for Improved Region Function Discovering

徐雅静 黎功福 薛超 罗安根 宋一晢

中国邮电高校学报(英文), 2016, 23 (1). doi：

摘要 ( 2075 ) PDF (7160 KB)( 161 )

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The process of urbanization is formed by regular movements of human beings. It yields different functional zones in a city, such as residential zone and commercial zone. Consequently, there exists a close connection between the human mobility pattern and the city’s zones. However, it is not easy to collect large-scale society-wide data that can precisely capture the underlying relations between the individual’s movement and the regional functions. Hence, our knowledge for understanding the basic patterns of human mobility is still limited. In order to discover the functions of different regions in a city, we propose an affinity based method in this paper. The affinity is a recently introduced metric for measuring the correlation of two connecting node in a complex network. The proposed model groups different functional zones by measuring user’s arrival/departure distribution via relative entropy. In addition to this, we also identify the intensity of each functional zone by taking kernel density estimation method. In the end, some experiments are conducted to evaluate our method with a large-scale real-life dataset, which consists of 3 million cellphone users’ records from a period of one month. Our findings on the interaction between the mobility pattern and the regional functions can capture the city dynamics efficiently and provide a valuable reference for urban planners.

Smooth support vector machine based on circular tangent function

张捷 范旭慧 班登科

中国邮电高校学报(英文), 2016, 23 (1). doi：

摘要 ( 2066 ) PDF (402 KB)( 263 )

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Real-time dynamic system to path tracking and collision avoidance for redundant robotic arms

高欣 贾庆轩 孙汉旭 陈钢 张倩茹 杨堉坤

中国邮电高校学报(英文), 2016, 23 (1). doi：

摘要 ( 1762 ) PDF (1247 KB)( 305 )

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Electromagnetic

Design and simulation of a compact ultra-wideband bandpass filter with a notched band using MMR technique

杨虹 陈静 杨浩澜 刘云龙 杨渝川

中国邮电高校学报(英文), 2016, 23 (1). doi：

摘要 ( 2016 ) PDF (947 KB)( 243 )

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A novel, compact, and highly selective ultra-wideband bandpass filter with a narrow notched band is presented. Apart from having a basic structure of a slotline multiple-mode resonator and microstrip feed lines, this novel design introduces a cross-coupling between the input and output feed lines to enhance the filter selectivity. The design strictly follows the theory and verified by electromagnetic (EM) simulation and experiments. In addition, the narrow notched band is introduced by embedding a pair of split ring resonators (SRR) in order to reject any undesired existing radio signals that may interfere with the FCC-defined UWB band. By changing the structural parameters of SRR, it can be easily tuned to any desired frequency. This filter can be integrated in UWB communication systems and efficiently improve the interference immunity from undesired signals such as wireless local area network (WLAN).

Design of High-Efficiency Broadband Power Amplifier Using Low-Pass Bias Network

俞启进 于翠屏 唐碧华 刘元安

中国邮电高校学报(英文), 2016, 23 (1). doi：

摘要 ( 2037 ) PDF (3161 KB)( 309 )

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A novel design of high-efficiency broadband power amplifier (BPA) with the low-pass bias network to enhance the efficiency and output power is presented in this paper. This letter presents an approach to enhance the efficiency and output power of a broadband power amplifier (BPA) by using a low-pass filter as the bias network. Compared with other bias networks, the proposed low-pass bias network shows a smaller baseband impedance, which can reduce the electrical memory effect. While it provides a larger radio frequency (RF) impedance, which can prevent the leakage of the output power from bias network. A BPA with the proposed bias network is designed using commercial GaN device Cree40025F. The designed BPA shows a fractional bandwidth of 40%, from 1.8GHz to 2.7GHz. The measured results exhibit 73.9 % drain efficiency (DE) value with output power of 43.5 dBm at 2.7GHz, which appears an enhancement of 9.5% and 2.5dBm comparing with that adopts LC bias network.