查询词典 abscissa of uniform convergence

to reduce the impact of carrier frequency offset in ofdm system,this thesis designs a new carrier frequency offset estimation scheme for ofdm system.the carrier frequency offset estimation includes acquisition and tracking.we adopt variable step size adaptive algorithm.the acquisition range of the proposed algorithm is as large as one half of the overall signal bandwidth.through this method we can not only avoid the feedback by using forward error correction,but also reduce the times of complex multiplication in order to reduce the power consumption of the system.this algorithm not only has low complexity and fast convergence nut also can improve the demodulation performance of ofdm system.computer simulation illustrates the superior performance of the proposed algorithm with regard to estimation accuracy in both awgn channel and multi—path channel.

摘 要：为了减小正交频分复用系统受频率偏差的影响，在ofdm系统中设计了一种新的载波频偏估计算法。频偏估计包括跟踪和捕获两个阶段，文中采用变步长自适应算法来进行跟踪，这个跟踪算法的捕捉范围是整个信号带宽的一半。通过此方法，不但可以利用前向纠错的方式来避免反馈，而且可以缩减复数乘法的次数以降低计算复杂度和系统功耗。该方法运算复杂度低，并具有较好的收敛性，能改善odfm的解调性能。从计算机的仿真效果可以看出无论是在awgn信道上还是在多径信道上都表现出了卓越的性能。

By constructing a Lyapunov-Krasovskii-like composite energy function, we prove the boundedness of all signals and the convergence of tracking error.

通过构造一个Lyapunov-Krasovskii型复合能量函数证明了所有信号有界并且跟踪误差收敛。

Although many results have been obtained, there are still a number of very interesting questions about composition operators unsolved. There is much more to be learned about the collective compactness and convergence of composition operator sequences, compactness of various product of composition operators, cyclicity, closed range and spectra of composition operators in various settings. Commutants of composition operators seem to be very difficult to characterize. Only a little is known about their reducing invariant subspaces. There has been no work on C〓 algebras generated by composition operators.

尽管已取得如此丰富的结果，但是关于复合算子仍然有大量非常有意义的问题值得研究，例如：复合算子序列的总体紧性及收敛性、复合算子的各种乘积的紧性、复合算子的闭值域问题、复合算子在各种解析函数空间上的谱的描述、换位复合算子的刻画、复合算子诱导的不变子空间问题、循环复合算子的研究、由复合算子生成的C〓-代数的研究、不同解析函数空间之间的加权复合算子及复合算子半群等等问题。

With the result of convergence we derive a computational formula of subdivision depth for Catmull-Clark surface.

而且，推导出一个计算细分后控制网格到Catmull-Clark曲面的距离公式。

Based on the computational properties of weight incremental formula in LMBP algorithm,an approach of improving the convergence speed of this algorithm is proposed and applied to the initial LMBP method.

由于它具有较高的鲁棒性和容错性、较短的故障诊断时间、较好的算法通用性等优点，所以在实际应用中，受到了广大专家学者的青睐。

Due to its smaller computus, faster convergence rate and smaller misadjustment, and its performance is not influenced by existing uncorrelated noise, the proposed algorithm can be applied perfectly in the adaptive noise cancellation system and achieves favorable performance in lower SNR situation.

该算法计算量小、易于控制，具有快速的收敛速度和较小的失调，不受已存在的非相关噪声的影响，可很好地应用于自适应对消系统中，且在低信噪比环境中仍能保持良好的性能。

We can not live up to life, because it is the condensation of sweat, effort of convergence.

我们绝不能辜负生命，因为那是汗水的凝聚，心血的汇聚。

However,the spectral condition number of the coefficient matrix becomes larger and the rate of residual convergence becomes slow.

然而，虽然所得的系数矩阵是非亏损的，但却导致谱半径变大，使得残量的收敛速度变慢。

In our study found Price Index in U.S. cities have conditional convergence when we control regional characteristic variables.

在我们的研究发现，在加入影响城市通货膨胀的控制变数下美国各城市物价指数有条件收敛的情形。

The case study of the conditional convergence analyses the parameters influencing the economic growth.

条件趋同实证分析了影响经济增长的因素。

You can snipe the second and third union leaders from this position.

您可以鹬第二和第三工会领袖从这一立场出发。

Aiming at the currently shortage of XML streams quality detecting, this paper proposes a new forecasting method of XML streams quality by least squares support vector machines, which is used the method of XML keys' vector matrix as windows, and vector product wavelet transform to multilevel decompose and refactor the XML streams series, that can fulfill real-time checking demand of XML quality, and ensure constraint, consist- ency and integrality. For even more adapting net load, it proposes a control strategy by weight and adaptive adjustment to ensure XML streams quality.

针对当前XML数据流质量检测存在的不足，提出构建XML键的矢量矩阵作为窗口，利用矢量积小波变换多级分解与重构XML数据流，再结合最小二乘支持向量机对XML数据流质量进行预测的一种方法，满足XML数据流质量重构时实时检测的要求，保证XML数据的约束性、一致性与完整性；为了更好的适应网络负载，采取加权与自适应窗口调整等调度策略充分保证XML数据流的质量检测。