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<title cf:type="text"><![CDATA[Editorial department of the Journal of National University of Defense Technology -->信息与通信工程·物理学]]></title>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Interference suppression generative adversarial nets]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202005001]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[In order to further improve the communication quality of the extremely-low-frequency communication further, based on the traditional improved generalized sidelobe cancellation, a new interference suppression algorithm in the field of extremely-low-frequency communication called generative sidelobe cancellation algorithm was proposed. Generative adversarial nets as one of the hot research topics in artificial intelligence was introduced into generalized sidelobe cancellation, the network structure and relevant hyperparameters of the generative model were designed and optimized, addressing the problem of the residual desired signal existing into the original algorithm effectively, providing more relevant reference information about the interference components in the main channel for the next-stage filtering algorithm of sidelobe cancellation channel, thereby enhancing the estimation accuracy of the interference components in the main channel. In order to validate the effectiveness of the optimized generative model and the suppression ability of the proposed algorithm on different types of interferences, an experimental platform was set up under the laboratory environment and multiple sets of controlled experiments were designed. The experimental results show that the optimized generative model has better generative ability, better robustness and relatively lower computational complexity. Compared with the traditional improved algorithm, the proposed algorithm can further improve the signal-to-interference-plus-noise ratio within the signal bandwidth further.]]></description>
<pubDate>2020/10/21 15:50:31</pubDate>
<category><![CDATA[信息与通信工程·物理学]]></category>
<author><![CDATA[LI Chunteng, JIANG Yuzhong, LIU Fangjun, JIA Shuyang, LI Songlin]]></author>
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<atom:name>LI Chunteng, JIANG Yuzhong, LIU Fangjun, JIA Shuyang, LI Songlin</atom:name>
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<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202005001]]></guid><cfi:id>8</cfi:id><cfi:read>true</cfi:read></item>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Waveform design of integrated radar and communication signals based on TDS-OFDM]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202005002]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[In the IRCS(integrated radar and communication system), which uses OFDM(orthogonal frequency division multiplexing) signals, the CP(cyclic prefix) and pilots can cause the problem of high peak to side lobe level in autocorrelation operation, which deteriorates the radar detection performance seriously. To solve this problem, a new RadCom signal based on TDS-OFDM(time domain synchronization OFDM) was proposed. The TDS-OFDM adopts TS(training sequence) for guard interval, as well as synchronization and channel estimation, so that the CP and pilots can be avoided. First, the ambiguity function of TDS-OFDM RadCom signal was analyzed. And then, TS was optimized to suppress the range side lobe of TDS-OFDM signal and maintain the autocorrelation properties of TS simultaneously. Theoretical derivation and simulation results show that TDS-OFDM signals are more suitable than CP-OFDM signals for IRCS.]]></description>
<pubDate>2020/10/21 15:50:31</pubDate>
<category><![CDATA[信息与通信工程·物理学]]></category>
<author><![CDATA[ZUO Jiajun, YANG Ruijuan, LUO Shaohua, LI Xiaobai]]></author>
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<atom:name>ZUO Jiajun, YANG Ruijuan, LUO Shaohua, LI Xiaobai</atom:name>
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<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202005002]]></guid><cfi:id>7</cfi:id><cfi:read>true</cfi:read></item>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Segmented variable-step-size LMS algorithm based on normal distribution curve]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202005003]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[The Traditional LMS(least mean square) adaptive filtering algorithm is always in a contradiction state because it has a fixed step size and resolves the relationship between steady-state error and convergence. Based on the analysis of the filtering algorithm, according to the step-size adjustment principle of the variable-step LMS adaptive filter algorithm, a segmented variable step size LMS adaptive filtering algorithm based on the normal distribution curve was proposed by constructing the nonlinear function of the step-size factor and the error signal, and the influence of the parameter value on the performance of the algorithm was analyzed. Aiming at the problem of difficult selection of reference signal in actual signal processing, a method of reference signal selection based on the splitting array was proposed. The theoretical and sea trial data analysis results show that the convergence speed and steady-state error of the proposed algorithm are obviously better than the fixed-step LMS adaptive filtering algorithm and the variable step size LMS adaptive filtering algorithm based on the Sigmoid function.]]></description>
<pubDate>2020/10/21 15:50:31</pubDate>
<category><![CDATA[信息与通信工程·物理学]]></category>
<author><![CDATA[WANG Pingbo, MA Kai, WU Cai]]></author>
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<atom:name>WANG Pingbo, MA Kai, WU Cai</atom:name>
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<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202005003]]></guid><cfi:id>6</cfi:id><cfi:read>true</cfi:read></item>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Intelligent routing strategy for software-defined satellite network based on Chebyshev neural network]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202005004]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[In the existing software-defined satellite network, the storage space of ternary content addressable memory occupied by the flow table is increasing, and the complex flow entry lookup and matching processes will bring about reduced route forwarding efficiency, which cannot meet the requirements of diverse application requirements. A neural network-based software-defined satellite network intelligent routing framework was proposed. The controller acquired the transmission mode of the data flow by training the neural network, and replaced the flow table with the trained neural network. Based on this framework, an intelligent routing strategy based on Chebyshev neural network was proposed. The switch predicts the forwarding path of data flow according to the service type of data flow to meet the quality of service requirements of satellite network applications. The simulation results show that the proposed routing strategy significantly reduces the occupied storage space of ternary content addressable memory and improves the routing efficiency.]]></description>
<pubDate>2020/10/21 15:50:31</pubDate>
<category><![CDATA[信息与通信工程·物理学]]></category>
<author><![CDATA[LIANG Jun, SUN Weichao, XIAO Nan, CHEN Weilong, GUO Zizhen]]></author>
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<atom:name>LIANG Jun, SUN Weichao, XIAO Nan, CHEN Weilong, GUO Zizhen</atom:name>
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<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202005004]]></guid><cfi:id>5</cfi:id><cfi:read>true</cfi:read></item>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Planar array pattern synthesis of wideband real time delay based on particle swarm optimization algorithm]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202005005]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[For the problem of the pattern synthesis for planar array with large elements spacing, a planar array pattern synthesis method of wideband real time delay based on particle swarm optimization algorithm was proposed. In this method, according to the characteristics of the main lobe orientation and the grating lobes orientation under the condition of real time delay, the wideband real time delay was adopted to suppress the grating lobe of pattern. Then, the structure of array was optimized by particle swarm optimization algorithm and the pattern with higher main-side-ratio was obtained. The effectiveness of the proposed method was indicated by the simulation for 8×8 rectangular planar array. Furthermore, the relationship between the grating lobe suppression performance and the signal bandwidth was studied through the simulation.]]></description>
<pubDate>2020/10/21 15:50:31</pubDate>
<category><![CDATA[信息与通信工程·物理学]]></category>
<author><![CDATA[CONG Wenshan, YU Lan, DU Pengfei, LUO Xiong, YANG Haida]]></author>
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<atom:name>CONG Wenshan, YU Lan, DU Pengfei, LUO Xiong, YANG Haida</atom:name>
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<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202005005]]></guid><cfi:id>4</cfi:id><cfi:read>true</cfi:read></item>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Directional-of-arrival estimation using the sparse representation of array covariance matrix]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202005006]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[In order to improve the efficiency of conventional DOA (directional-of-arrival) estimation methods based on the sparse representation of array covariance, an efficient DOA estimation method relying on the direct 2D sparse reconstruction was proposed. The 2D sparse reconstruction model was constructed by using the array covariance matrix. The noise power can be estimated and the influence of noise on DOA estimation can thus be reduced by applying the eigenvalue decomposition. In solving the 2D sparse reconstruction problem, the 2D-SL0 (2D smoothed L0 norm) algorithm was used, which can deal with the 2D data directly, free of matrix vectorization operation. Simulation results show that the efficiency of the proposed method can be improved significantly, and the performance of the proposed method is better than traditional methods under the conditions of low snapshot, low SNR and sparse array sensors, etc.]]></description>
<pubDate>2020/10/21 15:50:31</pubDate>
<category><![CDATA[信息与通信工程·物理学]]></category>
<author><![CDATA[QIU Wei, BAO Changchun]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>QIU Wei, BAO Changchun</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202005006]]></guid><cfi:id>3</cfi:id><cfi:read>true</cfi:read></item>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Analysis of seawater electric field influenced by conductivity and shape of the object]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202005007]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Electric field measurements in seawater will affect the target electric field. In order to improve the accuracy of the electric field measurement, the influence factors of the object on distribution of the electric field in seawater were studied by the finite element method, and the distribution law of the distortion electric field was determined. The simulation results show that the magnitude of the distortion peak and the distortion area are affected by the conductivity and shape of the object. When the conductivity of the object is smaller or larger than that of the seawater, the effect on the electric field distribution is on the opposite:the larger the curvature of the object is, but the larger the peak value of the distortion is, but the smaller the distortion area is.]]></description>
<pubDate>2020/10/21 15:50:31</pubDate>
<category><![CDATA[信息与通信工程·物理学]]></category>
<author><![CDATA[JI Dou, WANG Lizhu, ZHANG Jianchun]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>JI Dou, WANG Lizhu, ZHANG Jianchun</atom:name>
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<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202005007]]></guid><cfi:id>2</cfi:id><cfi:read>true</cfi:read></item>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Improvement of planar nearfield acoustic holography under the combined action of moving fluid medium and shear layer]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202005008]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Traditional planar nearfield acoustic holography places the hologram inside the jet. In order to reduce the adverse effect of window effect and wraparound error on reconstruction accuracy, it is generally required that the hologram size is twice more than that of the sound source, while larger microphone array placed inside the jet will interfere with the stability of the jet. To solve this problem, it was proposed to place the entire hologram outside the jet. According to the classical shear layer correction theory, the changes of path and amplitude of sound wave propagating from sound source to hologram were analyzed. Then the modified sound field propagation formula was derived. Finally, the theoretical model of planar nearfield acoustic holography under the combined action of moving fluid medium with the Mach number below 0.3 and shear layer was established. Numerical simulations show that the improved planar nearfield acoustic holography leads to reconstructed acoustic fields of high resolution, with high localization accuracy of aerodynamic noise source and certain anti-interference ability.]]></description>
<pubDate>2020/10/21 15:50:31</pubDate>
<category><![CDATA[信息与通信工程·物理学]]></category>
<author><![CDATA[ZHOU Hefeng, ZHAO Yun, TIAN Zhangfu, ZENG Xinwu, JIANG Weikang]]></author>
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<atom:name>ZHOU Hefeng, ZHAO Yun, TIAN Zhangfu, ZENG Xinwu, JIANG Weikang</atom:name>
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<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202005008]]></guid><cfi:id>1</cfi:id><cfi:read>true</cfi:read></item>
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