Multimode modulation is a good method to increase the frequency efficiency and to maintain smaller frequency occupancy rate.
其中多进制调制，不仅能够提高频谱利用率，并且能保证较小的频谱占用率。
In order to get high data rate communication, we must enhance frequency efficiency because mat frequency resource is limited.
频谱资源是有限的，为了实现高速通信必须提高频谱效率。
Based on the overlapped symbols which can achieve coding constrain, it can be improved frequency efficiency and system performance.
通过自然的符号叠加形成了编码约束关系，不仅大幅度的提高了系统的频谱效率，而且有效的提高了系统性能。
It has high frequency efficiency and its implement is simple. Therefore, it has become the topic in high-speed mass optical fiber communication system.
它具有结构简单，频谱利用率高的优点，因此成为高速大容量光纤通信系统中的研究热点。
In this paper, we divided the double frequency crystal into numerous small double frequency units and derived the harmonic power and the double frequency efficiency in each unit.
本文中将倍频晶体分割成无数多个小倍频单元，并导出每个倍频单元中的谐波功率与倍频效率。
Through spotlights cost reducing and frequency division utilization it improves system efficiency.
通过聚光降低成本，通过分频综合利用提高系统效率。
Effects of the radius of circular pipe and frequency on the inclusion removal efficiency were ascertained for each case.
对圆管半径、电磁场频率等参数对去除效率的影响作了分析阐述。
From a physical layer aspect, those techniques feature high frequency and power efficiency, and are able to adapt to changing environments and services, will win in the long run.
在物理层技术层面上，具有高频谱效率和功率效率，并能适应环境和业务变化的技术成为研究的热点。
Machine vibration frequency high, 3000 ~ 3600 times per minute, amplitude small-only 0.5 ~ 1, can be used in the viscous drug screening points, its screening efficiency.
该机振动频率高，每分钟3000 ~ 3600次，振幅小只有0.5 ~1，可以使用于粘性药分的筛分，其筛分效率高。
The application of vapor-liquid reseparator in the main return tube can effectively decrease the frequency of wet stroke and rapidly handle it and thus increase refrigerating efficiency.
采用在回汽总管上设置汽液再分离器，可以有效的减少湿冲程次数并能快速处理湿冲程现象，提高制冷效率。
Adopt IGBT frequency conversion of German Siemens and voltage feedback series resonance circuit. The conversion efficiency is reaching up to above 97.5%.
采用德国西门子IGBT变频，电压反馈串联谐振电路。变换效率高达97.5%以上。
Frequency screen is a new high efficiency machine and has the advantages of electromagnetic vibration, high frequency, high capacity and high screening efficiency.
复频筛是一种新型高效的筛分设备，具有电磁振动、高频率、设备处理能力大、筛分效率高等优点。
In view of the limitation of safety and efficiency of current water-heater, the basic structure and principle of a supersonic-frequency induction water-heater are introduced.
针对目前热水器的安全，效率等局限性，本文介绍了一种超音频感应加热热水器的基本结构和原理。
The result indicates that the slow wave structure significantly improves the microwave output power and conversion efficiency. The simulated microwave frequency agrees well with the predicted value.
研究结果表明这种慢波结构相对原结构在微波输出功率和转换效率上都有很大提高，微波工作频率与预测相符合。
The system may measure many circuits high - frequency alternating current , direct current , frequency, efficiency of inverter .
系统测试项目有多路高频交流电流，直流电流，频率，逆变器的效率等。
Cropping mechanism is a key component for variant frequency vibration cropping, and its excited frequency directly affects manufacturing quality and production efficiency.
变频振动下料机构是变频振动系统的重要执行部件，其激振频率直接影响制造质量和生产效率。
Study on parameters of the diamond cutting major raise the frequency of KDP crystal to change efficiency.
研究金刚石车削参数主要是为了提高KDP晶体的频率转化效率。
Therefore, point and interval prediction for system efficiency can be realized through frequency of frequency converter.
因此可由变频器的频率对其效率进行点预测或区间预测。
The harmonic amplitude equation and the generation efficiency of nonlinear optical frequency conversion(NOFC)in quasi-phase-matching (QPM) were discussed.
讨论了准相位匹配（QPM）技术中的非线性光频转换谐波振幅方程和谐波转换效率。
Then, the radiation efficiency at low frequency and frequency response at high frequency in fluid are computed respectively by both SYSNOISE software and AUTOSEA software.
然后结合SYS-NOISE软件和AUTOSEA软件分别计算壳体在流场中声辐射效率在低频段和高频段时的频率响应。
The results show that available power and power input of water pump continuously decline with motor frequency reducing, and pump efficiency also decrease at the same time.
结果水泵有效功率和输入功率均随着电机频率的下降而不断降低，同时水泵效率也随着频率下降而降低。
High frequency power supply for electrostatic precipitator has some excellences such as high efficiency, short time of spark recovery and small volume.
高频静电除尘电源具有效率高、火花恢复时间短、体积小等一系列优点。
The transmission angle is controlled by grating frequency and the diffraction efficiency is controlled by groove depth of sub-micro gratings to get uniformity of transmission filed.
亚微米光栅型导光板通过光栅空频控制出射光方向、控制槽深调节衍射效率，达到导光板出射光强的均匀性。
When the core of the frequency tripling transformer is variable section, its efficiency and thermal stability increase.
采用变截面铁心结构，可提高三倍频变压器的效率和热稳定性。
The additional axial finite magnetic field also has some influence on the beam-wave interaction efficiency and the resonance frequency.
外加纵向有限磁场也对注波互作用效率和谐振频率有一定的影响。
Simulations demonstrate that this method provides an accurate estimation of nonlinear residual frequency errors with high computation efficiency. An experimental result was also given.
仿真试验表明，该方法能够精确地估计调频非线性剩余频差，具有较高的运算效率，并给出了一个实际试验结果。
This article narrated the high-pressured frequency changer in iron-smelting dust removal system transformation analysis as well as the economic efficiency analysis.
】本文讲述了高压变频器在炼铁除尘系统中的改造分析以及经济效益分析。
The cavity can effectively choose center frequency, increase electron efficiency and output power of the Raman FEL operating in quasi -single mode regime.
该腔既可有效地选定中心频率，又可望提高准单模运转的喇曼自由电子激光器电子效率及其输出功率。
Mutation frequency and selective efficiency in M2 were obviously increased by application of the technique.
应用这项技术，可大大提高M 2代突变频率和选择效率。
Mutation frequency and selective efficiency in M2 were obviously increased by application of the technique.
应用这项技术，可大大提高M 2代突变频率和选择效率。
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