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国家教育部博士点基金(20120185130001)

作品数:5 被引量:12H指数:2
相关作者:臧锐王秉中周洪澄丁帅更多>>
相关机构:电子科技大学更多>>
发文基金:国家教育部博士点基金国家自然科学基金更多>>
相关领域:理学电子电信更多>>

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基于反演场扩散消除的时间反演多目标成像技术被引量:7
2016年
基于时间反演腔理论,分析了时间反演场存在的聚焦扩散现象.通过对该现象的分析,提出了利用Clean算法进行单频时间反演场扩散消除,进而实现时间反演多目标成像的技术.全波仿真结果表明,该技术能够消除时间反演场扩散的影响,利用单一频率信号实现多目标的成像.最后,分析了时间反演镜的选取对时间反演场的影响,并在此基础上,提出了非理想情况下相应的时间反演镜信号均衡算法,为时间反演多目标成像技术的实际应用提供了有效的支撑.
臧锐王秉中丁帅龚志双
关键词:多目标成像CLEAN算法
The determination of the relative permittivity of periodic stratified media based on the iterative time-reversal method被引量:1
2014年
In this paper, we present a new method to determine the relative permittivity of periodic stratified media using the iterative time-reversal method. Based on transmission line theory, the focal peak value of iterative time-reversal electro- magnetic waves, which contain information about the periodic stratified medium, is computed in pulse-echo mode. Using the relationship between the focal peak value and the relative permittivity of the periodic stratified medium, the relative permittivity can be obtained by measuring the focal peak value. Numerical simulations are conducted, and the results demonstrate the feasibility of the proposed approach to the measurement of the relative permittivity of a periodic stratified medium.
章志敏王秉中梁木生纪晴宋钢兵
Shannon information capacity of time reversal wideband multiple-input multiple-output system based on correlated statistical channels被引量:1
2016年
Utilizing channel reciprocity, time reversal(TR) technique increases the signal-to-noise ratio(SNR) at the receiver with very low transmitter complexity in complex multipath environment. Present research works about TR multiple-input multiple-output(MIMO) communication all focus on the system implementation and network building. The aim of this work is to analyze the influence of antenna coupling on the capacity of wideband TR MIMO system, which is a realistic question in designing a practical communication system. It turns out that antenna coupling stabilizes the capacity in a small variation range with statistical wideband channel response. Meanwhile, antenna coupling only causes a slight detriment to the channel capacity in a wideband TR MIMO system. Comparatively, uncorrelated stochastic channels without coupling exhibit a wider range of random capacity distribution which greatly depends on the statistical channel. The conclusions drawn from information difference entropy theory provide a guideline for designing better high-performance wideband TR MIMO communication systems.
杨瑜王秉中丁帅
时间反演电磁波应用系统的研究进展被引量:7
2013年
时间反演电磁波具有时-空同步聚焦、空间超分辨率聚焦等特性,据此可以构建大容量无线通信、超分辨率成像等新型电磁波应用系统。文章对时间反演电磁波应用系统的研究进展进行了综述,并对后续研究给出了建议。
王秉中臧锐周洪澄
关键词:应用系统
Split-ring-based metamaterial for far-field subwavelength focusing based on time reversal被引量:1
2014年
In this paper, split-ring-based metamaterial sheets are designed for the purpose of achieving far-field subwavelength focusing, with the aid of a time-reversal technique. The metamaterial sheets are inserted into a subwavelength array consist- ing of four element antennas, with the element spacing being as small as 1/15 of a wavelength. Experiments are performed to investigate the effect of the metamaterial sheets on the focusing resolution. The results demonstrate that in the presence of the metamaterial sheets, the subwavelength array exhibits the ability to achieve super-resolution focusing, while there is no super-resolution focusing without the metamaterial sheets. Further investigation shows that the metamaterial sheets are contributive to achieving super-resolution by weakening the cross-correlations of the channel impulse responses between the array elements.
黄海燕丁帅王秉中臧锐
关键词:TIME-REVERSALMETAMATERIAL
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