查询词典 one-step method

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。

Abstract］ objective to investigate anus sphincter preserved surgical method and indication for low rectal cancer.methods 15 cases with low rectal cancer were operated with eversion and pull-through anus preserved colorectal anastomosis through anus.results no patients died of operation,no patients was with fistula and stricture of anastomosis,no defecation incontinence happened after postoperative 20 weeks,only one patient was with local recurrence.following up for 8 months to 5 years,5 cases were with distant metastasis,4 of these died,one of these had lived with liver metastasis for 3 years.conclusion the indication of anus preserved operation should be chosen according to clinical stage and biological characteristic of rectal malignancy; eversion and pull-through anus preserved colorectal anastomosis through anus is a better anus preserved operation for low rectal cancer.

目的 探讨低位直肠癌保留肛门括约肌功能的手术方法和手术适应证。方法对低位直肠癌经腹经肛门直结肠外翻拉出保留肛门吻合术15例。结果全组无手术死亡，未发生吻合口漏和吻合口狭窄，局部复发1例，20周左右恢复正常排便排气功能，无大便失禁病例。随访8个月～5年，5例为远处转移，死亡4例，其中1例肝转移3年仍生存。结论根据直肠癌的临床分期和肿瘤的生物学特性选择保肛手术适应证，经腹、肛门齿线上直肠癌根治性切除，行肛门直结肠外翻拉出吻合是低位直肠癌较好的保肛术式。

Regarding four phase-stepping method, the difference of new instrument is that the original instrument requires four quarter-wave plates and needs to set up eight different angular magnitudes, whereas the new one requires only one quarter wave plate and changes the angle of analyzers.

在三场架设中，有别於一般需四道光路和输出时的四分之一波板，并且只要调整检偏器之角度便可得到三张的包裹相位图；而四场架设里，也只需多一片输出时的四分之一波板，使其中两道光路的结果为圆偏光，此外，仍然只转动检偏器之角度即可，相较传统的四场，除了元件的简化外，角度设定也较简单容易；六场平偏则改善了一般平偏或圆偏只能单一取得主应力角或因四分之ㄧ波板所造成的影响。

The video coding method includes the steps of dividing input frames into one final low-pass frame and at least one high-pass frame through a motion compensated temporal filtering, coding the final low-pass frame and then decoding the coded final low-pass frame, re-estimating the high-pass frame by using the decoded final low-pass frame, and coding the re-estimation high-pass frame.

所述视频编码方法包括以下步骤：通过运动补偿时域滤波将输入帧划分为一个最终低通帧和至少一个高通帧；对最终低通帧编码并随后对编码的最终低通帧进行解码；通过使用解码的最终低通帧重估所述至少一个高通帧；以及对重估的高通帧编码。

Based on the relation between structure surface vibration speed and acoustic emission energy, this paper introduces a method which allows one to estimate the noise level from the vibration speed of one point of a gearbox surface and the operating deflection shape .

基于结构表面振动速度与结构辐射声能的关系，针对以结构声为主的变速箱现场噪声评价问题，提出根据结构表面单点振动速度和工作振型来计算结构辐射声能的方法，此法大大简化了变速箱现场噪声检测的过程，提高了检测效率。

One sort of ecological factor or a method was controlled and charged by their adoring one spirit or multi-spirits, such as sun-god, water-spirit, gnome, mountain-god, cattle-god, goat-god, tree-god, etc.

他们所崇拜的一种神或多种神控制和掌管着一种生态因子或一种方法手段，如太阳神、水神、土地神、山神、牛神、羊神、树神等等。

L of fresh blood, 0.05mg of tissus-debris, one plucked hair, one 20th of a tooth pulp and 2μ1 of amniotic fluid were enough for sex determination by this method.

样本经制备相当于0.1ul新鲜血的血痕，0.05 mg的组织块，带毛囊的头发1根，1/20颗牙齿牙髓质和2ul的羊水经本法检查，均能确定其性别。

Accordingly, as the major targets weighing the quality of the telescope,its luminous energy concentration degree directly influence the quality of the image of the celestial body. So many kinds of technique about the optical quality testing of telescope have came forth. Hartmann screen test is one of the most classical among them and it has become one of the main testing method on several large-scale telescopes in the world because of some strongpoints suchas briefness, visuality and easy handlment.The image through the350mm telescope of the Yunnan observatory has aberration in general, subsequently,the relative position of the primary mirrior has err when blooming and reinstalling .

因此，天文望远镜光能集中度作为衡量天文望远镜质量的重要指标，直接影响到所成天体像的质量好坏，所以就出现了多种天文望远镜光学质量检测方法，其中最经典的是哈特曼光栏法，它因简单、直观、操作方便等优点而成为世界上多台大型天文望远镜的重要质量检测方法之一。

Adopting stepchildren by the stepparents is one kind of adopting method in the Adoption Act and it has been one good measure to adjust the relationship of remarried family with more and more people selecting remarriage.

继父母对继子女的收养是我国现行《收养法》中规定的一种收养方式，现实生活中大量再婚家庭的出现也使得继父母对继子女的收养可以成为调整再婚家庭关系的良好措施之一。

The Comparative method is one of the most important methods of Linguistics and it is also one of the ways we solve many problems around us.

对比方法是语言学中的重要方法之一，也是我们解决许多问题的方法之一。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。