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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。

Construction progress chart compiled with flow process without steps is difficut to show the critical path. The construction period is long and difference is large.

摘要］现行的无节拍流水进度编制方法编制的施工进度计划表难以反映关键路线，得出的工期长而且偏差大。

But in the difference between the two words, there is expressed a vast difference in one's attitude toward privacy and propriety.

但这两个词的不同表达了对私事和礼节态度的截然不同态度。

In this thesis, working condition that influence the two evaluating indicators has been analyzed on basis of experiment study. Statistics has been used to deal with the experiment data, and work out a expressions that can count the real time efficiency of total heat exchanger from temperature difference and absolute humidity difference of inside and outside air and working air volume.

本文采用实验的方法，对影响全热交换器的两个效率的工况因素进行了分析，并采用多元线性回归的方法对实验数据进行处理，得到一个通过室内外空气间的温度差，绝对湿度差和工作风量来计算全热交换器的实时工作效率的经验公式。

The difference, especially the absolute difference, between one number in a set and the mean of the set.

离差差别，尤指绝对差异，也就是指一套装置中的某一个与其它的之间的差异

The reverse permeability coefficients of CO2 is affected by pressure difference and decreases evidently with the increase of the absolute value of pressure difference.

CO_2的反向渗透系数受N_2高压侧的影响显著，随CO_2对N_2压差绝对值的增大迅速减小。

An algorithm for detecting moving IR point target in complex background is proposed,which is based on the Reverse Phase Feature of Neighborhood of target in difference between neighbor frame images that two positions of the target in the difference image are near and the gray value s of them are close to in absolute value but with inverse sign.

基于运动点目标在邻帧差分图像中所具有的近邻反相特征，即运动点目标的两个位置相邻近、灰度值一正一负，提出一种在复杂背景下，基于红外序列图像的运动点目标检测算法。

An algorithm for detecting moving IR point target in complex background is proposed,which is based on the Reverse Phase Feature of Neighborhood of target in difference between neighbor frame images that two positions of the target in the difference image are near and the gray values of them are close to in absolute value but with inverse sign.

朱风云 ，秦世引基于运动点目标在邻帧差分图像中所具有的近邻反相特征，即运动点目标的两个位置相邻近、灰度值一正一负，提出一种在复杂背景下，基于红外序列图像的运动点目标检测算法。

Second, there was a significant difference in teaching satisfaction among faculty with difference length of service, and academic rank.

二、不同任教年资及教师职级大学教师之「教学工作」满意程度显著差异。

The compensation system is definitely affected by academic rank, type of university, proportionof teaching and research affairs, the public-private difference and also, the gender difference. Inthe recent years, the changing of occupation mix and collective bargaining in higher educationare the new trends to affect university compensation system.

学衔、高校类型、教学与科研的比重、公私立、性别等因素对美国高校教师的薪酬的影响是确切的，并且，学科因素、高等教育内部职业结构的改变以及美国高校教师组织参与教师薪酬的谈判，这些是近年来影响美国高校教师薪酬的新动向。

Chimborazo and Cotopaxi, took me by the hand.

越过琴博腊索山和科托帕克西山。

This car is in a good condition.

这辆车的状况很好。