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。
Overall band structure diagram is obtained by DFT-LDA, and then GW approximation is used to correct band energies for some high symmetric k points to get accurate prediction.
总体的能带结构图是利用DFT-LDA得到，而随后采用GW近似方法对一些高对称k点的能级进行了修正，以期得到准确的预测值。
It makes use of the RSSI weighted centroid algorithm to obtain an orientation position, uses the RSSI value to compute the overall distance error coefficient, and then takes the method of successive approximation to get the amendment value from the orientation results.
本算法首先利用RSSI加权质心算法获得一初次定位位置。其后，在一个较合理的范围内，引入RSSI值计算总体距离误差系数，采取逐次逼近的方法对初次定位的结果进行修正。
AN ENGINEERING APPROXIMATION OF SUPERSONIC FLUTTER FOR OVERALL MISSILE CONFIGURATION The engineering prediction method for aerodynamic characteristics of the symmetrical tactical missile configuration with inlet
全弹组合体超音速颤振的一种工程计算方法带进气道的面对称布局战术导弹气动特性工程估算
Secondly, the overall trend of volatility of non-interest income and interest income growth shows a certain degree of approximation, especially in the dramatic rise and fall.
第二，非利息收入与利息收入增长率的总体趋势表现出一定程度的近似性，尤其是在剧烈的升降中更是表现出很强的同步性。
With respect to the minimization of the overall average variance of interference noise under the standard Gaussian approximation condition, the optimal partial auto-correlation function of the spreading sequences for A-CDMA systems is derived.
在标准高斯近似条件下，以最小化系统平均多址干扰方差为准则，推导出了A-CDMA系统最佳扩频序列的部分自相关函数形式；
Or, at a much higher cost of collection, it's possible to calculate an approximation of the percentage of overall CPU resources consumed by the thread for an execution.
或者，如果收集成本特别高的话，可以计算线程在执行时占用CPU资源的百分比的近似值。
Using the penalty function method, convex two-level programming can be transformed a concave programming with convex restricted set, and then, overall optimum solu - tion will be obtained by the outer approximation algorithm.
用罚函数法将二层凸规划问题化为约束区域为凸集的凹规划，然后用渐进外逼算法求其全局最优解。
Figure 1, a histogram, depicts the overall composite scores and indicates that they form a reasonable approximation of a normal distribution.
图形1，一个柱状图，描述了所有的合成分数，显示了他们服从一个合理的接近常规分布。