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an article about Adaptive Time-Frequency Codes for Ultra-wideband
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宽带接收机窄带信号频率和二维方向角估计的新方法，对研究阵列信号处理的有帮助-Wideband receiver narrowband signal frequency and two-dimensional DOA estimation of the new method, array signal processing research help
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本文介绍了基于SDR（软件无线电）的新一代卫星宽带解调器，它由CPCI刀片工控服务器、2块中频变频采集卡及4块解调译码卡组成，本文介绍了其基本原理、结构组成、性能参数，阐述了各板卡的具体设计与实现，并给出了部分性能仿真，最后介绍了实现时的技术难点。 -The main idea of SDR is to construt an open and modularized general platform,to carry out all kinds of functions with softwa
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In this paper we investigate a multilayer frequency selective surface (FSS) and its potential use in ultra wideband (UWB) antennas. A complete design and analysis of the FSS with
an example UWB antenna is presented. The multilayer FSS provides an a
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Two elements diversity planar antenna for a
multiple-input multiple-output application is proposed. By adopting two Y-shaped radiators, the antenna provides wideband impedance
matching characteristic over the desired frequency band. To reduce the
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Modern wireless communication systems are expected to support high data rate, allowing users to access high quality multimedia content, anytime-anywhere. To support high data rate, wideband frequency channels are required. However, frequency selectiv
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在OFDM系统
中，宽带信道被分割相互重叠的窄带子信道，如果各子信道
的带宽比信道的相干带宽要小，那么信号传输就有可能在无
频率选择性衰落或者平坦衰落的信道进行。-In OFDM system
The wideband channel is divided into narrowband sub-overlapping, if each sub-
The bandwidth is less than the coherence bandwidth of the channe
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