查询词典 discrete continuous system

The paper investigates both block-type pilot linear minimum mean square error algorithm and IEEE802.16 OFDM channel estimation analysis. Simulation results confirm the block-type pilot structure is more suitable for IEEE802.16 system. An optimal pilot setting algorithm, based on space frequency domain, is explored and the pilot chart is presented. The proposed algorithm finds its application in MIMO-OFDM. Simulation results show the algorithm presents a good approximation to the perfect channel state information curve, with about 2dB difference in SNR. The simulation results also demonstrate the algorithm achieves fairly high stability in the environment of fast fading, performance of the proposed algorithm is better that of pilot training channel estimation.3. Taking into account the characteristics of IEEE802.16 OFDM system, OFDM system simulation platform is constructed in Matlab, exploiting simulink as a tool. OFDM modulation and demodulation simulation system are configured on LabVIEW platform. All the system signal processing is simulated, including defining system parameters, designing modulation model, and verifying all the proposed algorithms under different environments, such as white Gaussian noise, multi-path fading, with or without guard interval etc. Bit error performance is evaluated. The research provides valid theoretical basis for practical OFDM system performance evaluation.4. Taking advantage of software radio, the paper designs a hardware platform with both 256-IFFT/FFT and 512-IFFT/FFT OFDM schemes co-existing in one platform. You can predetermine one from the two schemes to carry out almost the same model function with different system performance and parameter setting.5. Referring to IEEE802.16 standard, the paper proposes a design method for generating signals and frames suitable for laboratory investigations implemented in laboratory environment.6. Based on 6701evm digital evaluation card, combined with analogy front-end, the paper designs a DSP software model to deal with baseband signal processing. An overall OFDM scheme, with modulation and demodulation function, is accomplished.

讨论分析了MIMO-OFDM中一种基于空频域的最优导频设置算法，给出了导频图案，通过仿真实验表明，该算法与理想的信道状态信息曲线非常接近，信噪比差距约在2dB左右，并且在快衰落条件下具有较好的稳定性，其性能要优于基于前导训练的信道估计方法。3、根据IEEE802.16OFDM系统特点，论文分别在Matlab中应用Simulink工具构建OFDM系统仿真平台、在LabVIEW平台上实现了OFDM调制解调仿真系统，模拟了整个系统的信号流程，进行了OFDM仿真系统参数的选择和调制模块的仿真设计、论证各算法性能，并根据各种不同的条件：例如高斯噪声、多径衰落、有无保护间隔等，对系统的误码特性进行了评估，为正确评价实际OFDM系统的性能提供了有效的理论依据。4、论文以软件无线电思想作为指导，提出了以256点IFFT／FFT为核心和以512点IFFT／FFT为核心的两种OFDM算法模式并存于同一个硬件平台、且可预选的方案，它们在参数选取和性能指标上有所差异，均实现了相似的模块和功能。5、论文参考IEEE 802.16无线网络标准的参数设置，针对本设计系统的应用环境和系统硬件的性能速率，提出了一种应用于实验室环境的信号结构、帧格式等参数设计。6、论文基于TI公司的6701evm数字评估板卡，结合模拟前端搭建数字中频平台，设计了基带处理的DSP软件模块并进行系统调试，基本实现了一套完整的OFDM调制解调方案。

Its main components are cotton collecting head, hydraulic system, chassis, operating system, cotton transferring system with wind power, cotton box, electron monitoring system, wiring system, shower wetting system, auto lubricate system and dynamic protecting system etc.

主要由采棉头部件、液压系统、底盘、操纵系统、风力输棉系统、棉箱部件、电子监控系统、电器系统、淋润系统、自动润滑系统、动态防护系统等构成。

They include:① the "three-horse carriage" system of the rural youth education,② the "dumbbell type" management system of the rural youth secondary education,③ the "spindle type" investment management system of the rural youth secondary education,④ the new security mechanism and system of the rural youth secondary education,⑤ the new management system of the teachers of the rural senior middle school,⑥ the management system of the professional and technical training of the rural youth,⑦ the seven patterns which rely on the Rural Communist Youth League to exploit rural youth human resource,⑧ the "management modeling carbinol structure" and the management system of the rural youth center,⑨ the system connecting various rural youth organizations, economical entities and the government, and ⑩ the mechanism of leading and security which can attract the youth workers gone out to come back.

包括：（1）关于农村青年教育的&三驾马车&体系的建立；（2）&哑铃型&农村青年中等教育管理体制架构的建立；（3）&纺锤型&农村青年中等教育投资管理体制的建立；（4）新的农村青年中等教育的保障机制及其体系的建立；（5）新的农村高级中等学校师资管理机制的建立；（6）农村青年职业技术培训的管理体制的建立；（7）依靠农村共青团组织开发农村青年人力资源开发的途径及其作用机制——七种模式的建立；（8）农村青年中心管理体制和运行机制的&仿甲醇结构管理模型&的建立；（9）农村经济实体与政府及各种农村青年组织关系体制的建立；（10）农村外出青年劳动力回流的疏导和保障机制的建立。

In order to make the right evaluation of the state which is the consumption consume of the steam line system, we make an test of the heat loss of the steam line network. And we also probe into the heat loss of the steam line system and the factors. In order to solve the heat inefficency of the steam line system, we look into the present situation of the steam line network and the state of heat preservation. Then we found the open questions and the weak points of heat preservation. We make the evaluation and affirm the reason of the heat inefficency of the system. We adopted the combination of bench test and engineering optimization, then we screened out high-quality adiabator, and designed the best heating composition. We designed and developed the software"The analysis and optimization of energy of the steam line system in thermal production" It can offer convenience to the computational analysis of heat loss of the steam line system. It can also be used for design calculation and experimental verification of steam pipeline feasible radial-radius, so it can offer technical support for the reduce of heat loss of the system, the raise of well head steam quality and the raise of heat efficicency of the steam injection system.

为了对输汽系统的用能状况作出正确的分析评价，对输汽管线热损失进行了测试计算，对输汽系统热量损失及影响因素进行了探讨；为了解决输汽系统热效率低的问题，从输汽管网现状及管道保温状况调查入手，掌握存在的问题和保温薄弱环节，做出分析评价，确认导致系统热效率低的原因，采用室内试验与工程优化相结合的办法，筛选出优质保温材料，设计最优保温结构，同时设计开发了&热采输汽系统能量分析及优化软件&，为输汽系统热量损失计算分析和保温结构优化提供了方便，还对输汽管线合理辐射半径进行了设计计算及实验验证，从而为降低系统的热能损失，提高井口蒸汽干度，提高注汽系统的热效率提供了技术支持。

Their influence on the efficiency of the adjoint method should be distinguished into the continuous and discrete model to be researched.

其对变分同化中伴随方法的有效性影响应分连续模型与离散模型两种情况研究。

The main idea of the finite difference method is as follows: We consider the discrete difference equation with the finite alphas as approximate substitution for the differential equation with the continuous variant and boundary conditions.

有限差分方法的基本思想是用离散的，只含有有限个未知数的差分方程去近似代替连续变量的微分方程及边界条件，并把相应的差分方程解作为微分方程的近似解。

This dissertation shows each unstable asymptotic equilibrium point is just the pattern that refuses to be recognized by combining the idea about constraint and projection with the continuous network LSSM and the discrete network BSB, eliminates some shortcomings of LSSM and BSB in the distribution of attraction domain. LSSM and BSB are then improved to be ideal associative memory and can be implemented by circuit.

将约束投影思想与连续神经网络LSSM和离散神经网络BSB相结合，说明了不渐近稳定的平衡点恰是实际中拒识模式，根除了LSSM和BSB在吸引域分布等方面的一些缺点，将它们完善成为理想的联想记忆器，并且它可用电路实现。

This way, a discrete case can be represented with a more continuous structure, and we can have a well defined curve for missing points.

这样，一个独立的案件，可以表示为更持续的结构，我们可以有一个明确的失踪点曲线。

Discrete and continuous random variables, theoretical distribution, expected value, binomial distribution and normal distribution, standardizing and normality.

间断性变数总体的理论分布重点掌握二项分布和泊松分布，连续性变数总体的理论分布重点掌握正态分布以及正态分布的标准化。

In printing, to separate continuous-form paper into discrete sheets using a burster.

在印刷技术中，用裁纸器将连续形式的纸分割成单张纸。

A historical region of southwest France between the Pyrenees and the Garonne River. The duchy of Aquitaine was joined with France after the marriage of Eleanor of Aquitaine to King Louis VII in1137, but its possession was disputed after her subsequent marriage to Henry II of England.

阿基坦法国西南部一个历史地区，位于比利牛斯山和加隆河之间，在1137年阿基坦的埃莉诺与国王路易斯七世结婚之后阿基坦公国加入法国，但当她再嫁英国亨利二世后，其归属权便受到争议

There are moments when I look at the smiling , happy faces of my expectant staff and wonder how they will cope when confronted by an outraged housemaster along with an unrepentant and recalcitrant bleached blond teenager in 18 years ' time .

有时候，我看着那些满怀期待的员工微笑，幸福的脸，想着当他们遇到一位愤怒的宿舍管理员和一位不知悔改，叛逆，而且将头发染成白色的18岁少年时，他们会如何处理。