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提高传感器阵列自适应处理鲁棒性的空时广义加载法
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作者 唐斌 汪学刚 邹见效 《仪器仪表学报》 EI CAS CSCD 北大核心 2008年第1期185-190,共6页
由于实际杂波环境是非均匀的,工程上空时自适应处理(STAP)缺少足够的均匀杂波样本支持,其性能严重降低。本文提出了空时广义加载法,用Herm it型的Toep litz-B lock-Toep litz矩阵对样本协方差矩阵进行加载,所以它是对角加载法的推广。... 由于实际杂波环境是非均匀的,工程上空时自适应处理(STAP)缺少足够的均匀杂波样本支持,其性能严重降低。本文提出了空时广义加载法,用Herm it型的Toep litz-B lock-Toep litz矩阵对样本协方差矩阵进行加载,所以它是对角加载法的推广。该算法具有对角加载的鲁棒性和简单性优点,同时又保持了必要的空时静态性能。空时广义加载法能有效降低样本不足和非均匀带来的影响,同时实现了更好的杂波抑制和低旁瓣,具有采样要求低、鲁棒性强、工程实现方便等特点。分别用仿真数据和实测数据验证了该方法的有效性。 展开更多
关键词 传感器阵列 雷达 自适应处理 广义加
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玻璃钢制大功率消防艇
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作者 包志宇 《安徽消防》 2000年第5期33-33,共1页
关键词 玻璃钢制 消防艇 消防设备 空载时 燃料贮罐容积
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Performance of STBC-MC-CDMA system based on complex wavelet packet and turbo coding
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作者 虞湘宾 毕光国 《Journal of Southeast University(English Edition)》 EI CAS 2005年第4期398-404,共7页
On the basis of analyzing the principle of the space-time coding technique and the multi-carrier code division multiple access (MC-CDMA) technique, adopting the turbo codes as channel coding and the optimized comple... On the basis of analyzing the principle of the space-time coding technique and the multi-carrier code division multiple access (MC-CDMA) technique, adopting the turbo codes as channel coding and the optimized complex wavelet packet as multi-carrier modulation, a novel space-time block coded the MC-CDMA system based on complex wavelet packet and turbo coding is proposed, and the system bit error rate (BER) performance in the Rayleigh fading channel is investigated. The system can make full use of space-time block codes' transmit diversity and turbo codes' good ability against fading channel to improve the BER performance significantly, and it can also avoid the decrease of spectrum efficiency of conventional MC-CDMA due to inserting cyclic prefix (CP) by utilizing superior characteristics of the optimized complex wavelet packet. Simulation results show that the proposed space-time block coded MC-CDMA system based on the complex wavelet packet performs better than the conventional space-time block coded MC-CDMA (STBC-MC-CDMA) system, and slightly outperforms the STBC-MC-CDMA with CP. Moreover, the application of the space-time block coding technique concatenated with turbo codes strengthens the system ability to combat various interferences in fading channel further. 展开更多
关键词 multi-carrier technique complex wavelet packet space-time block code code division multiple access turbo coding
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Estimating model for urban carrying capacity on bike-sharing 被引量:1
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作者 YU Jia-jie JI Yan-jie +1 位作者 YI Chen-yu LIU Yang 《Journal of Central South University》 SCIE EI CAS CSCD 2021年第6期1775-1785,共11页
As the demand for bike-sharing has been increasing,the oversupply problem of bike-sharing has occurred,which leads to the waste of resources and disturbance of the urban environment.In order to regulate the supply vol... As the demand for bike-sharing has been increasing,the oversupply problem of bike-sharing has occurred,which leads to the waste of resources and disturbance of the urban environment.In order to regulate the supply volume of bike-sharing reasonably,an estimating model was proposed to quantify the urban carrying capacity(UCC)for bike-sharing through the demand data.In this way,the maximum supply volume of bike-sharing that a city can accommodate can be obtained.The UCC on bike-sharing is reflected in the road network carrying capacity(RNCC)and parking facilities’carrying capacity(PFCC).The space-time consumption method and density-based spatial clustering of application with noise(DBSCAN)algorithm were used to explore the RNCC and PFCC for bike-sharing.Combined with the users’demand,the urban load ratio on bike-sharing can be evaluated to judge whether the UCC can meet users’demand,so that the supply volume of bike-sharing and distribution of the related facilities can be adjusted accordingly.The application of the model was carried out by estimating the UCC and load ratio of each traffic analysis zone in Nanjing,China.Compared with the field survey data,the effect of the proposed algorithm was verified. 展开更多
关键词 bike-sharing urban carrying capacity space-time consumption method density-based spatial clustering of application with noise(DBSCAN)algorithm
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CLOSED-FORM SPACE-TIME CHANNEL BLIND ESTIMATION FOR SPACE-TIME CODED MC-CDMA SYTEMS WITH UNIFORM LINEAR ARRAY
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作者 Zeng Yanxing Yin Qinye Luo Ming Zhang Jianguo 《Journal of Electronics(China)》 2006年第3期321-327,共7页
This paper proposes a closed-form joint space-time channel and Direction Of Arrival (DOA) blind estimation algorithm for space-thne coded Multi-Carrier Code Division Multiple Access (MC-CDMA) systems equipped with... This paper proposes a closed-form joint space-time channel and Direction Of Arrival (DOA) blind estimation algorithm for space-thne coded Multi-Carrier Code Division Multiple Access (MC-CDMA) systems equipped with a Uniform Linear Array (ULA) at the base station in frequency-selective fading environments. The algorithm uses an ESPRIT-like method to separate multiple co-channel users with different impinging DOAs. As a result, the DOAs for multiple users are obtained. In particular, a set of signal subspaces, every one of which is spanned by the space-time vector channels of an individual user, are also obtained. From these signal subspaces, the space-time channels of multiple users are estimated using the subspace method. Computer simulations illustrate both the validity and the overall performance of the proposed scheme. 展开更多
关键词 Multi-Carrier Code Division Multiple Space-time channel Antenna array Direction Of Arrival Access (MC-CDMA) Space-Time Coding (STC) (DOA)
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China's First Space Laboratory Tiangong 2 Was Launched into Space Successfully
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作者 WEI Jinghua 《Aerospace China》 2016年第3期55-55,共1页
A LM-2F launch vehicle lifted off from the Jiuquan Satellite Launch Center at22:04 Beijing time on September 15,putting China’s first space laboratory Tiangong 2 into space.575 seconds after the liftoff,Tiangong 2 s... A LM-2F launch vehicle lifted off from the Jiuquan Satellite Launch Center at22:04 Beijing time on September 15,putting China’s first space laboratory Tiangong 2 into space.575 seconds after the liftoff,Tiangong 2 separated from the carrier rocket and entered its preset orbit.The launch achieved complete success. 展开更多
关键词 launch putting spacecraft rocket manned separated seconds orbit technological beginning
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Smart Nanomedicine for Ondemand Drug Release and Synergistic Antitumor Therapy
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《Bulletin of the Chinese Academy of Sciences》 2015年第4期255-255,共1页
Smart nanoparticles(NPs)that respond to external and internal stimulations have been developing to achieve optimal drug release in tumor.However,applying these smart NPs to attain high antitumor performance is hampe... Smart nanoparticles(NPs)that respond to external and internal stimulations have been developing to achieve optimal drug release in tumor.However,applying these smart NPs to attain high antitumor performance is hampered by limited drug carriers and inefficient spatiotemporal control.Recently,a research team led by CAI Lintao from the Institute of Biomedicine and Biotechnology, 展开更多
关键词 Biotechnology Release inefficient applying antitumor attain breakthrough smart encapsulation respond
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