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A digital filter structure for wideband filtering
is proposed. It consists of two allpass filters and a linearphase
FIR filter. One major advantage of this structure is
that the allpass filters are functions of zM which implies
that the maxim
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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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多頻帶正交分頻多工之超寬頻系統模擬與等化器設計--超寬頻（Ultra-wideband UWB）是一種已經有實體層規格被提報出來 的新系統，它
具有高位元傳輸率 ，能在短距離 的通訊網路 上提供高速的數 據傳輸。近來 ，因為UWB的
多項優點，使得UWB技術被研究來 用於室內短距離 的傳輸上，且在很多其他的使用上還
有很大的發展潛力 。在這份論 文中，我們將用mat
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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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在超宽带相干光传输系统中，一个新的频率便宜估计方法。-In ultra wideband coherent light transmission system, a new method to estimate the frequency of cheap.
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This paper presents a proposed model in an
explicit form and its simulation results for
characterizing wideband line-of-sight (LOS)
radio channel in an urban microcellular
environment. The model is fast to compute, easy
to implement, and on
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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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宽带信号目标方位估计，直接处理法，基于频域正交分解方法-wideband source location through frequency-dependent modeling
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本系统由前级宽带放大模块、增益控制模块、无源衰减模块、功率放大模块和直流稳压电源模块组成，具有0~60dB范围内手动连续调节、带宽为0.3M~100MHz的功能。在前级放大中，采用两片宽带低噪声放大芯片ADA4895级联对输入信号进行放大，然后由800MHz带宽的可变增益放大器AD8368进行放大倍数调节，最后通过低噪声电流反馈运放THS3001进行功率放大，从而达到1V有效值输出。在系统设计中，采用了合理的阻抗匹配，规范的高频线路布局和有效的散热设置，并且综合考虑了去耦、滤波，以及使用同轴电缆
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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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本论文的工作是对近场圆形阵列宽带信号进行处理，获得目标/焦点位置增益输出，
预先定义宽带信号阻带的旁瓣衰减大小以及感兴趣频域内的恒定波束宽带模式。本文使
用不同的方法解决这个设计问题，该问题分为两部分，第一部分解决频域内的模型设计，
第二部分给出时域内的结果。仿真结果表明解决方法的有效性。
-This thesis work is a circular array of broadband near-field signal is processed to obtain the
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The digital wideband receiver is a critical component in modern digital receivers. The receiver has the capability to expose and distinguish adverse signals contained within a large bandwidth (on the order of 1 GHz or more) of the radio frequency (RF
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改进的非相干信号子空间宽带测向算法(最大功率频点选择)-Improved non-coherent signal subspace wideband direction finding algorithm (maximum power frequency selection)
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Abstract The key of developing high frequency wideband communication system is how to
model the HF wideband channel. Some HF wideband models are discussed and compared in this paper,
including Vogler model, parallel subband model, two impro
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