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摘要:基于通信技术的列车运行控制系统(CBTC)是铁路信号的发展方向，交频分复用
OFDM)是一种无线环境下的高速传输技术，它对高速列车控制信息传输中卞要受到的由于多
径传播引起的快衰落所产生的影响有很强的抵抗能力.本文首先介绍了OFDM技术的发展和
基本原理，然后在计算机上用M atlal〕对其性能进行了仿真，仿真中将OFDM与传统的单载波
调制方式—i1，交振幅调制( 1frQAM)对抗多径十扰的性能进行了比较，最后分析了一者的仿真结果.
-Abstract: Based
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一种基于正交投影的波束形成算法。首先由 MVDR算法确定初始权向量 其次根据该权向量与
其它用户波达角方向的关系 ,建立干扰信号的导向矢量矩阵 然后通过正交投影原理 ,将期望信号的导向矢量投影
到干扰信号的零空间上 ,从而求得最优权值。仿真结果证明了该算法的有效性。-An orthogonal projection beamforming algorithms. First, by the MVDR algorithm to determine the initial weight ve
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ADIBEAM
Abstract—the increase in navigation accuracy demanded by
EGNOS and Galileo and their future evolution encourages the
study and design of advance receiver architectures. In that
direction, the ADIBEAM project focuses on the design
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resented in this paper. Based on the measured
radar cross section (RCS) of interested targets and
the coverage diagrams of the different radars in a
radar network, the approach can be used to solve
the problem of how optimally to locate the r
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In this paper, we address a new unexplored problem
- what are the optimal patterns to achieve connected coverage in
wireless networks with directional antennas. As their name implies,
directional antennas can focus their transmission energy in
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简述了 GPS干扰的分类 ,介绍了目前针对各种不同干扰所采用的技术手段 ,并分析了其各
自的优缺点及适用性 ,重点讨论了 GPS抗干扰技术的发展方向及应用前景。-GPS interference classification briefly describes the current techniques used for a variety of disturbances, and the analysis of its various
The advantages and disa
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In this paper, a line detection algorithm, which is based on direction filter and regional growth, is proposed for line
detection problem in a specific angle. The algorithm is better than the state-of-the-art algorithm in the detection of the
spe
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In this paper, a line detection algorithm, which is based on direction filter and regional growth, is proposed for line
detection problem in a specific angle. Our algorithm is better than the state-of-the-art algorithm in the detection of the
spe
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