查询词典 pilot officer

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。

Armstrong August 5, 1930 Wa Pake was born in Ohio in the United States reached the city of his childhood learning seriously, when the ideal is to grow the pilot, 14-year-old began to receive flight training, 16-year-old pilot certificate to obtain ,1949-1952, he became the Navy The youngest pilots. Armstrong in July 1953 expiry of the service backward Pardew Aviation University of Technology, after graduating from Edwards Air Force Base in any test pilot, later took part in the X-15 rocket plane's flight plan had been 6 flight, highest altitude reached 60,000 meters. In September 1962, a rigorous selection process, Armstrong became the first civilian from the pilot in the selection of one of the 2 astronauts, space industry and from forged a bond.

阿姆斯特朗1930年8月5日生于美国俄亥俄州瓦帕科内达市，他从小学习认真，理想是长大当飞行员，14岁即开始接受飞行训练，16岁获得飞行员证书，1949—1952年成为海军中最年轻的飞行员。1953年7月阿姆斯特朗服役期满后进帕杜大学学习航空技术，毕业后在爱德华兹空军基地任试飞员，后参加过X—15火箭飞机的飞行计划，曾进行过6次试飞，最高飞行高度达到6万米。1962年9月，经过严格挑选，阿姆斯特朗成为首批从文职飞行员中征选的2名宇航员之一，从此与航天事业结下了不解之缘。

The invention discloses a multi-cell pilot frequency distribution method applied in an orthogonal frequency-division multiplexing system, which comprises the following steps: generating at least two different original frequency hopping sequences according to a predetermined pilot frequency domain; generating a combined frequency hopping sequence (having length greater than that of the original frequency hopping sequences) from at least two different original frequency hopping sequences; generating different pilot frequency structures satisfying collision threshold requirements based on the combined frequency hopping sequence; and distributing the generated pilot frequency structures to each cell.

本发明公开了一种多小区导频分配的方法，用于正交频分复用系统，按照预定的导频频域间隔生成至少两种不同的原始跳频序列；将至少两种不同的所述原始跳频序列生成组合跳频序列，所述组合跳频序列的长度大于所述原始跳频序列的长度；基于所述组合跳频序列生成满足碰撞门限要求的不同导频结构；将所述生成的导频结构分配给各小区。

All the jobs including the assignment of pilot, vehicle driver, pilot boat task, the pilot charge, the assess of pilots, vehicle drivers, pilot boats are completed manually at present.

如何架构该系统，尤其是其J2EE框架如何实现，以及在整个框架中，应用程序的可重用性是本论文主要讨论的问题。

Army Chief Warrant Officer Amber Smith is an OH-58 Kiowa Warrior pilot; Lacey Smith is an Army chief warrant officer and flies the UH-60 Black Hawkl; and Air Force Captain Kelly Smith serves as a C-130 Hercules pilot.

陆军一级准尉阿姆波·史密斯是OH-58"基奥瓦"直升机的驾驶者、陆军一级准尉莱西·史密斯的坐骑是UH-60"黑鹰"直升机，而空军上尉珂丽·史密斯驾驶的则是C-130"大力神"中型运输机。

Army Chief Warrant Officer Amber Smith is an OH-58 Kiowa Warrior pilot; Lacey Smith is an Army chief warrant officer and flies the UH-60 Black Hawkl; and Air Force Captain Kelly Smith serves as a C-130 Hercules pilot.

陆军一级准尉阿姆波·史密斯是OH-58&基奥瓦&直升机的驾驶者、陆军一级准尉莱西·史密斯的坐骑是UH-60&黑鹰&直升机，而空军上尉珂丽·史密斯驾驶的则是C-130&大力神&中型运输机。

The program will help you succeed in a variety of criminal justice positions, including courtroom administrator, police officer, private security officer, probation or parole officer, juvenile delinquency case manager, corrections officer, or police detective.

该计划将帮助您成功的刑事司法各种职务，包括法庭管理员，警察，私人保安人员，缓刑或假释官，青少年犯罪案件管理员，看守人员，或警察侦探。

If the above conditions do not obtain,a M aritine Declaration of Health will haveto be comp leted and free p ratique givenbefore any person other than a p ilot,cus2tom s officer,imm igration officer or author2ised officer boards or leaves the ship w ith2out the perm ission of the medical officer.

如存在上述情况，则必须完成海上健康申报单手续，获得免疫通行证，然后任何人员才能在未经检疫官员许可的条件下登船、离船，例外的有领航员、海关官员、移民官员或其他得到批准的官员。

Held yesterday in Beijing's suburbs transform old pilot at the scene at the meeting was informed that the focus on improving the outskirts of the city infrastructure, improve the quality of life of the old peasant reform pilot project officially launched, Huairou village a number of Crown land the development potential of certain villages in the project will serve as the first pilot village.

在北京郊区的变换岁试点在现场会上获悉，重点放在改善城市的郊区基础设施，改善生活质量的老农民改革试点项目正式启动，怀柔的一些村庄官地的发展潜力，一些村庄的项目将作为第一个试点村。

a scheme of channel estimation using cyclic prefix based on the measurement of the low-voltage power line channel model is presented.after obtaining the frequency response of pilot sub-channel under the state of comb-type pilot,the data sub-channel response is obtained by interpolating the frequency response in frequency direction.in the pilot-free data period,the estimation of the channel is carried out by using cyclic prefix in order to improve the performance of system error rate.

摘 要：通过实际测量给出低压电力线的信道模型，在此基础之上提出了利用循环前缀对信道进行估计的方法，即在梳状导频模式时，使用导频获得导频子信道频率响应后，对其在频域方向进行插值得到数据子信道响应，在其后没有导频的序列的数据周期内，使用循环前缀对信道进行估计，从而起到改善系统误比特性能的目的。

Listen,point and check your answers.

听，指出并且检查你的答案。

Warming needle is one of effective treatment methods for knee arthralgia aggravated by cold,and it is simple,safety,so it should be developed in clinical acupuncture and moxibustion extensively.

但以本院科针灸门诊在2005年1月—2006年6月期间共收治膝痛患者100余例，经过临床的诊断后，其中施以温针治疗的48例，疗效显著，报道如下。1临床资料本组病例48