随着多输入多输出(Multiple In Multiple Out, MIMO)技术在4G/5G移动通信以及军事领域中的大量应用,对MIMO通信信号进行侦收自然成为通信电子战中的一个研究热点,但是空分复用MIMO通信中多个信号分量的时频重叠特性使得传统侦察方法难...随着多输入多输出(Multiple In Multiple Out, MIMO)技术在4G/5G移动通信以及军事领域中的大量应用,对MIMO通信信号进行侦收自然成为通信电子战中的一个研究热点,但是空分复用MIMO通信中多个信号分量的时频重叠特性使得传统侦察方法难以对其实施有效处理。针对这一问题,在对空分复用MIMO通信信号传输模型构建的基础上,对侦察方应具备的侦收条件进行了详细分析,针对不同应用场景提出了对侦察信道传输矩阵与综合信道传输矩阵进行估计,以及通过盲源分离等盲信号估计来提取各层传输码流的处理方法,并通过仿真对理论模型与处理流程的正确性与有效性进行了验证,从而为后续实际工程应用提供了理论与方法上的指导。展开更多
As the web grows, the massive increase in information is placing severe burdens on information retrieval and sharing. Automated search engines and directories with small editorial staff are unable to keep up with the ...As the web grows, the massive increase in information is placing severe burdens on information retrieval and sharing. Automated search engines and directories with small editorial staff are unable to keep up with the increasing submission of web sites. To address the problem, this paper presents Infomarker an Internet information service system based on open Directory and Zero-Keywond Inquiry. The oPen Directory sets up a net-community in which the increasing netcitizens can each organize a small portion of the web and present it to the others. By means of Zero-Keywond Inquiry, user can get the information he is interested in without inputting any keyword that is often required by search engines. In Infomarker,user can record the web address he likes and can put forward an information request based on his web records. The information matching engine checks the information in the open Directory to find what fits user's needs and adds it to user's web address records. The key to the matching process is layered keywoof mapping. Infomarker provides people with a whole new approach to getting information and shows a wide prospect.展开更多
文摘随着多输入多输出(Multiple In Multiple Out, MIMO)技术在4G/5G移动通信以及军事领域中的大量应用,对MIMO通信信号进行侦收自然成为通信电子战中的一个研究热点,但是空分复用MIMO通信中多个信号分量的时频重叠特性使得传统侦察方法难以对其实施有效处理。针对这一问题,在对空分复用MIMO通信信号传输模型构建的基础上,对侦察方应具备的侦收条件进行了详细分析,针对不同应用场景提出了对侦察信道传输矩阵与综合信道传输矩阵进行估计,以及通过盲源分离等盲信号估计来提取各层传输码流的处理方法,并通过仿真对理论模型与处理流程的正确性与有效性进行了验证,从而为后续实际工程应用提供了理论与方法上的指导。
文摘As the web grows, the massive increase in information is placing severe burdens on information retrieval and sharing. Automated search engines and directories with small editorial staff are unable to keep up with the increasing submission of web sites. To address the problem, this paper presents Infomarker an Internet information service system based on open Directory and Zero-Keywond Inquiry. The oPen Directory sets up a net-community in which the increasing netcitizens can each organize a small portion of the web and present it to the others. By means of Zero-Keywond Inquiry, user can get the information he is interested in without inputting any keyword that is often required by search engines. In Infomarker,user can record the web address he likes and can put forward an information request based on his web records. The information matching engine checks the information in the open Directory to find what fits user's needs and adds it to user's web address records. The key to the matching process is layered keywoof mapping. Infomarker provides people with a whole new approach to getting information and shows a wide prospect.
