Institute of Communication Engineering

China

Institute of Communication Engineering

China
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Duan R.,Institute of Communication Engineering | Jia L.,Institute of Communication Engineering
Proceedings - 2015 8th International Symposium on Computational Intelligence and Design, ISCID 2015 | Year: 2016

By directing at the problem that the existing fixed spectrum allocation method of HF access network cannot satisfy the new requirement of applying intelligent frequency hopping technology, the spectrum demand of intelligent frequency hopping HF access network is analyzed, and a spectrum allocation model based on graph coloring theory is established for the spectrum allocation issue of HF access network users. Besides, spectrum allocation algorithm applicable to intelligent frequency hopping HF access network is proposed. According to the simulation results, this method can effectively solve application problems of intelligent frequency hopping technology in HF access network, and meanwhile quickly, efficiently and accurately complete allocation of usable spectrums, compared with fixed frequency communication of using fixed spectrum allocation method, intelligent frequency hopping of adopting this method can obviously increase subnet reachability and network throughput of HF access network. © 2015 IEEE.


Huang W.,University of Science and Technology of China | Xiong Y.,University of Science and Technology of China | Li X.-Y.,Tsinghua University | Li X.-Y.,Illinois Institute of Technology | And 4 more authors.
Proceedings - IEEE INFOCOM | Year: 2014

We propose an accurate acoustic direction finding scheme, Swadloon, according to the arbitrary pattern of phone shaking in rough horizontal plane. Swadloon tracks the displacement of smartphone relative to the acoustic direction with the resolution less than 1 millimeter. The direction is then obtained by combining the velocity from the displacement with the one from the inertial sensors. Major challenges in implementing Swadloon are to measure the displacement precisely and to estimate the shaking velocity accurately when the speed of phone-shaking is low and changes arbitrarily. We propose rigorous methods to address these challenges, and apply Swadloon to several case studies: Phone-to-Phone direction finding, indoor localization and tracking. Our extensive experiments show that the mean error of direction finding is around 2.1o within the range of 32m. For indoor localization, the 90-percentile errors are under 0.92m. For real-time tracking, the errors are within 0.4m for walks of 51m. © 2014 IEEE.


Wang H.,Institute of Communication Engineering | Song L.,Institute of Command Automation
Advanced Materials Research | Year: 2011

Mobile peer to peer system in Ad hoc network is a brand novel application system. In this paper backgrounds and basic concepts of mobile peer to peer (p2p) systems are introduced firstly. Then possible applications of mobile p2p systems are expounded. Afterwards, technical challenges which mobile p2p system must face are analyzed in detail. In the end, the developments and implementation of mobile p2p system are explored and some conclusions are given. © (2011) Trans Tech Publications Switzerland.


Li B.,Tsinghua University | Yang P.,Institute of Communication Engineering | Wang J.,Institute of Communication Engineering | Wu Q.,Institute of Communication Engineering | And 4 more authors.
IEEE Transactions on Mobile Computing | Year: 2014

For cognitive wireless networks, one challenge is that the status and statistics of the channels' availability are difficult to predict. Numerous learning based online channel sensing and accessing strategies have been proposed to address such challenge. In this work, we propose a novel channel sensing and accessing strategy that carefully balances the channel statistics exploration and multichannel diversity exploitation. Unlike traditional MAB-based approaches, in our scheme, a secondary cognitive radio user will sequentially sense the status of multiple channels in a carefully designed order. We formulate the online sequential channel sensing and accessing problem as a sequencing multi-armed bandit problem, and propose a novel policy whose regret is in optimal logarithmic rate in time and polynomial in the number of channels. We conduct extensive simulations to compare the performance of our method with traditional MAB-based approach. Simulation results show that the proposed scheme improves the throughput by more than 30% and speeds up the learning process by more than 100%. © 2012 IEEE.


Li B.,Institute of Communication Engineering | Yang P.,Institute of Communication Engineering | Li X.-Y.,Illinois Institute of Technology | Tang S.,Illinois Institute of Technology | And 2 more authors.
Proceedings - IEEE INFOCOM | Year: 2012

For cognitive wireless networks, one challenge is that the status of the channels' availability and quality is difficult to predict and quantify. Numerous learning based online channel sensing and accessing strategies have been proposed to address such challenge. In this work, we propose a novel channel sensing and accessing strategy that carefully balances the channel statistics exploration and multichannel diversity exploitation. Unlike traditional MAB-based approaches, in our scheme, a secondary cognitive radio user will sequentially sense the status of multiple channels in a carefully designed ordering. We formulate the online sequential channel sensing and accessing problem as a sequencing multi-armed bandit problem, and propose a novel policy whose regret is in optimal logarithmic rate in time and polynomial in the number of channels. We conducted extensive simulations to compare the performance of our method with traditional MAB-based approach. Our simulation results show that our scheme improves the throughput by more than 30% and speed up the learning process by more than 100%. © 2012 IEEE.


He P.,Nanjing Institute of Technology | Xu Z.,Institute of Communication Engineering
ICCET 2010 - 2010 International Conference on Computer Engineering and Technology, Proceedings | Year: 2010

Each node equipped with multiple interfaces in multi-channel wireless mesh networks can increase the network throughput when applied to appropriate channel assignment and routing protocols. In this paper, we analyze the channel assignment and channel switching problems in WMN where the number of interfaces is smaller than the number of channels. Ripple effect caused by channel switching is presented. The method to restrict the distance of ripple effect and to balance the load among channels is given. We also advance the Weighted Expected Residual Transmission Rate (WERTR) - a load-aware routing metric - to select a best quality route which is suitable for use with our proposed channel assignment strategy. © 2010 IEEE.


Wu Z.M.,Institute of Communication Engineering
7th International Conference on Wireless Communications, Networking and Mobile Computing, WiCOM 2011 | Year: 2011

In this paper, a novel topology sequence calculation method is proposed and applied to track correlation algorithm. Based on attribute of topology sequence, tracks from different sensors will be same when there are no errors in sensor's measurement. In order to recognize track from blurred measurement, hypothesis verification is used. Detailed experimental results on such correlation algorithm confirm that topology sequence is robust to range and angle error of sensor measurement, not only including random error, but also including system error. © 2011 IEEE.


Wu J.,Institute of Communication Engineering | Zhao W.,Institute of Communication Engineering | Zhang L.,Institute of Communication Engineering
Proceedings - 2010 IEEE Asia-Pacific Services Computing Conference, APSCC 2010 | Year: 2010

The Data Distribution Service for Real-time Systems (DDS) mainly describes how data is dealt with in a single node, but not the mode of data-exchange among nodes. The centralized label publication subscription mechanism is used for data-exchange in this article. In the wireless network, especially low speed wireless network of battlefield, it is important to research on performance of this mechanism and relationship among number of node, RTT (round-trip time) and receiving-to-sending ratio. From the simulation, we derive the conclusion that centralized label publication subscription mechanism is suitable for the network of some nodes. © 2010 IEEE.


Wu X.,Anhui University of Technology | Wu X.,Hefei University of Technology | Yang P.,Institute of Communication Engineering | Jung T.,Illinois Institute of Technology | And 2 more authors.
Proceedings of the International Symposium on Mobile Ad Hoc Networking and Computing (MobiHoc) | Year: 2014

Compressive Sensing (CS) has been recognized as a promising technique to reduce and balance the transmission cost in wireless sensor networks (WSNs). Existing efforts mainly focus on applying CS to reliable WSNs, namely, each wireless link is 100% reliable. However, our experimental results show that traditional compressive data gathering (CDG) could result in arbitrarily bad recovery performance, when the wireless links are lossy. In this paper, we study the impact of packet loss on compressive data gathering and ways to improve its robustness using sparsest random scheduling (SRS). The key idea of our scheme is to treat each sampling value as one CS measurement, which helps us to reduce the impact of packet loss on the recovery accuracy. Our scheme also outperforms the tradition CDG in reliable WSNs in that our scheme has significantly lowered transmission cost. To achieve this, we present a sparsest measurement matrix where each row has only one nonzero element. More importantly, we propose a representation basis to sparsify the gathering data, and prove that our measurement matrix satisfies the restricted isometric property (RIP) with high probability. Extensive experimental results show our scheme can recover the data accurately with packet loss ratio up to 15%, while traditional CDG can hardly recover the data under similar or even better conditions. © 2015 ACM.


Li B.,Institute of Communication Engineering | Yang P.,Institute of Communication Engineering | Wang J.,Institute of Communication Engineering | Wu Q.,Institute of Communication Engineering | Li X.-Y.,Illinois Institute of Technology
Proceedings - 8th IEEE International Conference on Mobile Ad-hoc and Sensor Systems, MASS 2011 | Year: 2011

In multichannel system, user could keep transmitting over an instantaneous "on peak" channel by opportunistically accessing and switching among channels, so as to exploit link layer time-frequency diversity. In this paper, we consider an opportunistic channel accessing/releasing scheme for maximizing system throughput in multichannel system under Rayleigh fading environment. The time-dependence of Rayleigh fading is accurately characterized by finite-state Markov channel (FSMC) model. The main goal of this paper is to devise throughput-optimal strategy for determining when to access (which) channel and when to release it. The chanllenge of the problem comes from the fact that user can never know the instantaneous quality of all channels. In fact, it has to make real time decisions purely depending on the quality of current channel and the statistics of candidate channels. We formulate this real time decision making process as a two dimension optimal stopping problem. We prove that the complexity of the two dimensional optimal stopping rule can be reduced to a simple threshold-based policy. The dynamic data transmission process under threshold-based opportunistic channel access/release strategy is then analyzed by properly constructing absorbing Markov chain. Leveraging the absorbing Markov chain theory, we attain the optimal threshold as well as maximum achievable throughput with computational efficiency. Numerical results show that our proposed channel utilization scheme achieves up to 120% throughput gain over opportunistic transmission with a single channel and up to 70% throughput gain over opportunistic channel access with constant transmission duration. © 2011 IEEE.

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