基带

The modulation mode of baseband signal and working parameters of radar can be changed agilely.

本文设计了基于DSP的AD9857实现数字上变频方案，该方案由DSP产生不同编码的数字基带信号，并实现对AD9857的控制。

We put forwarded a ion beam structure modification method for fabrication of biaxially textured Ni tape.

本基金项目提出一种离子束结构改性工艺，用于制备双轴织构取向Ni基带。

The development of different kinds of alloy substrates used in either rolling-assistant biaxially textured substrate technique or ion beam assistant deposition method was reviewed. Furthermore, from the view of cost-effect, several popular substrates were proposed.

总结目前几种重要的金属及其合金基底，从材料的制备手段，织构形成的特点和性能，存在的优缺点以及未来的发展趋势等方面介绍了涂层导体中金属基带的研究现状。

The fabrication of highly biaxially textured Ni and Ni-based alloys, are very important for fabricating high quality YBCO long-length coated conductors.

具有高度双轴织构取向的Ni金属及其合金基带的获得，对于制备高性能的YBCO覆膜长导体具有重要的意义。

The fabrication of highly biaxially textured Ni and Ni-based alloys, are very important for fabricating high quality YBCO long-length coated conductors.

中文摘要：具有高度双轴织构取向的Ni金属及其合金基带的获得，对于制备高性能的YBCO覆膜长导体具有重要的意义。

The growth of CeO2 buffer layer on biaxially textured Ni-5at% W with direct current magnetron reactive sputtering method was reported.

采用直流磁控反应溅射法在双轴织构的镍钨合金(Ni-5%W)基带上生长CeO2过渡层。

The experimental results indicate that combining durational model with traditional recognition algorithm can effectively reduce both the deletion and insertion error rate and consequently about 47.74% total recognition error rate reduction is achieved over the baseline system.

实验表明，结合持续时间模型的语音识别算法可以有效地减少删除与插入错误率，使总体识别错误率比基带系统减少了47.74%。

By time-varying filtering, we realize the signal selectivity and interference suppression, especially for the signals with time-varying power spectrum. It is shown herein that conventional eigenstructure based methods are lower dimensional special case of the time-frequency subspace fitting method. The closed-form array response estimation algorithms for blind source separation in wireless communication is also developed in the dissertation by exploiting the data structure of second-order statistics of the array output in the presence of multipath. The proposed method achieves array response estimation with little constraint on signal property and propagation environment such as scatters or angular spread. Moreover, the array utilized here can be of arbitrary geometry and even uncalibrated. Since the closed-form solution is obtained, no misconvergency may occur and large amount of computation can be saved. The equivalent feed model and corresponding optimization designation are proposed to realize the downlink multi-user selective transmission. By coherent and non-coherent superposition of the electromagnetical field, multiple beams can be formed using a single array, so that each co-channel user signal is transmitted in each beam and will not interfered with each other. The proposed system scheme implements the digital beamforming and the channel allocation in the base band, therefore is suitable for the utilization of the radio software technology. The feasibility and effectiveness of the proposed model are proved by the RF experiment.

在窄带条件下，GSC－SSF方法还可以提高阵列的虚拟孔径，从而提高估计的性能；可以证明，Cyclic DOA 和SC-SSF方法可看作该方法的特例或近似； 3、提出了二维GSC－SSF方法和宽带谱相关DOA矩阵方法，利用信号的循环平稳特性解决了宽带条件下二维 DOA 估计问题，并具有阵元数少、计算量较小的特点； 4、提出了时频子空间拟合和宽带时频DOA估计算法，将联合时频分析的理论和方法引入到阵列信号的空间谱估计研究中，利用时变滤波实现信号选择性测向和干扰抑制，特别适合于谱时变信号；可以证明传统特征结构法可看作是时频子空间拟合方法的特例； 5、提出了多用户环境下阵列响应的估计方法——CARE方法，该方法对信号结构和传播参数（主要是散射源分布与角度散布）的约束较少，适用于各种几何结构的阵列甚至未校准的阵列，能够直接得到阵列响应的闭式解，因此计算量小、稳健性好，不存在收敛问题； 6、提出了针对多用户下行选择性发送的阵列等效激励模型、优化设计方法及其系统实现方案，通过空间场的相干叠加与非相干叠加使得单一阵列能够形成多个波束，并保证各波束内的用户信号各不相同且相互干扰最小；其系统方案具有在基带实现数字波束成形、信道分配并便于软件无线电实现的特点，其有效性已得到外场实测数据的证实。

Base Band Interpolator Pulse Shaping filter is a key component of all digital modulator.

基带内插脉冲成形滤波器是全数字调制器的核心模块之一。

A method by using 8031 single-clip microprocessor to get the syntonical bit information is presented,based on the characteristic of the modulated singal in ascending cosine envelope.

文摘：利用升余弦包络调制信号的特点，即基带信号为升余弦波，接收端可以利用这一包络，从中提取定时信息。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。