查询词典 valid bit

That is, a hacker can produce a valid signature for any message without the signer's secret keys. In chapter 4, we research the digital signature schemes based on quadratic residue problem. We first propose a new and efficient bit perturbation.

第三章第二节，首先分析Harn密钥交换协议的安全性，然后根据数学问题y=g〓 mod p设计两种新的密钥交换协，从而避免了Harn密钥交换协议的不安全因素。Z。

Although it's not common, using 32-bit values for the scroll bar range is perfectly valid.

尽管它不常用，但是将 32 位值用于滚动条范围是更有效的。

A valid write to the scratchpad will clear the PF bit.

一个有效的写入暂存器将清除公积金位。

Bit 6 of the E/S register, called PF, is set if the number of data bits sent by the 1-Wire master is not an integer multiple of 8 or if the data in the scratchpad is not valid due to a loss of power.

位的E / S寄存器6，被称为酚醛，是集如果由1 - Wire主机发送的数据比特数不是整数倍数8或如果在暂存器中的数据是无效的原因是失去权力。

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。

It is pointed in this paper that the key of bits hydraulic design is to optimize flow field structure from the view of 3-D flow, and combining with CFD techniques to design and optimize bit hydraulics will be good to make domestic bit research progress.

本文首先提出以旋转系统内部三元流动理论去研究井下流场结构是钻头水力设计的关键，并指出借助CFD计算技术设计流场和优化钻头设计将更有利于我国钻头水力研究的发展。

Not only does it have the logo and a nice bit of color, but a bit of a dark side to counterbalance it.

它不仅具有标识和颜色漂亮一点，但一个黑暗的一面位抗衡它。

Finally we put Heath and Abbie together in a room and filming a bit of it and they improvised away from it a little bit and the chemistry was fantastic.

我们最后让Heath和Abbie 一起拍摄一点小片断，他们稍微即兴发挥了一下，两人间的chemistry是意想不到的。

Windows Aero requires high system specifications in order to work, with the minimum requirements of at least 1 GHz 32-bit (x86) or 64-bit (x64) processor, 1 GB of system memory and a DirectX 9 compatible graphics accelerator processor card with a minimum of 128 MB of Video RAM, installed with Windows Display Driver Model driver.

Windows Aero的要求高，系统规格，为了工作，符合最低要求，至少1 GHz 32位（ x86 ）或64位（ x64 ）处理器，为1 GB的系统记忆体，以及支持DirectX 9兼容的图形加速器处理器卡与最小128 MB的视讯RAM ，安装与Windows显示驱动模型的驱动程序。

This book is the account of the most special place of Harry Potter, as well as his friends, in this mystical magic school in bit by bit.

而这本书最特别的地方就是记述了哈利波特，还有他的朋友，在这个神秘的魔法学校中的点点滴滴。

For the head-teacher of the class said that I had seriously broken the school rules,which led me to a three-day suspend class.

为什么呢？因为我的班主任说我严重的违反了校规，于是让我停课三天。

Many of them believe that the conversion of thousands of working-class folk in England spared that nation from the mass carnage and the tyranny that came with the revolution in France.

他们之中有许多人相信，在英国数以千计的劳工阶级之悔改信主使英国免於遭受如法国大革命所造成的大屠杀和专制暴政。