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- With the ground effect, they own higher lift/drag ratio than general aircraft, so need less thrust power and have the ability to carry more loads or fly longer. 在地效的作用下,它的升阻比比一般的飞机大,因而飞行时所消耗的推进功率小,具有更大的载重量或航程。
- The Soviets had much more thrust power;they launched the first inhabited capsule with a dog in it,and then in 1961 made Cosmonaut Yuri Gagarin the first human to orbit the earth. 苏联一路高歌猛进:他们发射了第一艘载人飞船,当时其中搭载的是一只狗,接着于1961年让尤里·加加林成为首位进入地球轨道的宇航员。
- One of the key techniques is to reduce the peak-to-average power ratio(PAPR) of the OFDM-CPM system. 降低OFDM-CPM系统中的峰值平均功率比(PAPR)是关键技术之一。
- A simple but effective scheme to reduce the high peak-to-average power ratio (PAPR) of OFDM is presented. 摘要针对正交频分复用(OFDM)所具有的高峰均比问题,提出了一种简单有效的降低峰均比的非线性变换方法。
- However, the major drawback of WOFDM is the peak-to-average power ratio(PAPR) problem. 然而小波正交分频多工技术的主要缺点,就是有太大的峰均值功率比。
- The curve of effective power ratio shows convexity shape along with increase of rotational speed or throttling. 有效功比率随转速或油门开度的增大基本成中凸状。
- Reducing the Peak-to-Average Power Ratio(PAPR) is one of the key technologies in MC-CDMA system. 降低信号峰平比(PAPR)是多载波码分多址(MC-CDMA)系统的关键技术之一。
- The increase of DP,amplitude and power ratio(PR) in the obesewere significantly higher than those in control group(P<0.01 and P<0.05). 肥胖组餐后功率及振幅增加值显著高于正常体重组(P<0.;01);
- The peak-to-average power ratio of orthogonal frequency division multiplexing(OFDM systems is reduced with an improved constellation extension scheme. 为降低正交频分复用(OFDM)信号的峰均功率比,提出了改进的星座图扩展方法。
- At present, the launch of satellite, space shuttle and airship is based on the power which is produced by rocket.It is expensive and not safe.Moreover, it cannot produce thrust powerful enough. 目前人造卫星、宇宙飞船,航天飞机等均靠火箭为推力,送人造天体经过地球大气层而进入太空中去,这样费用贵,不安全,又难能产生大推力,送大天体上太空。
- However one of main problems of OFDM is its high Peak-to-Average Power Ratio (PAPR) which seriously limits performance of High Power Amplifier (HPA). 但OFDM的主要缺点之一是它的严重影响了高功率放大器(HPA)性能的高峰值平均功率比(PAPR)。
- Orthogonal Frequency Division Multiplex (OFDM);Multicarrier-Code Division Multiple Access (MC-CDMA);Peak-to-Average Power Ratio;Performance; Preferred. 08正交频分复用;多载波码分多址;峰平功率比;性能;优选
- We can imagine a spacecraft carrying a big area of him film to collect solar energy, with an ion?jet engine to produce thrust powerful enough to boost a spacecraft to a speed of 160 km a second. 我们可以设想一艘航天器,它装载着收集太阳能的巨大薄膜,并载有一个能产生强大推力足以使航天器加速到每秒160公里的离子喷气发动机。
- We can imagine a spacecraft carrying a big area of him film to collect solar energy,with an ion-jet engine to produce thrust powerful enough to boost a spacecraft to a speed of 160 km a second. 我们可以设想一艘航天器,它装载着收集太阳能的巨大薄膜,并载有一个能产生强大推力足以使航天器加速到每秒160公里的离子喷气发动机。
- In this paper, the OFDM system which is based on fractional Fourier transform (FRFT) has been introduced, and the function of peak-to-average power ratio (PAPR) is achieved. 摘要介绍了基于分数阶傅里叶变换的正交频分复用系统,推导了该系统中峰均功率比公式。
- We can imagine a spacecraft carrying a big area of him film to collect solar energy, with an ion jet engine to produce thrust powerful enough to boost a spacecraft to a speed of 160 km a second. 我们可以设想一艘航天器,它装载着收集太阳能的巨大薄膜,并载有一个能产生强大推力足以使航天器加速到每秒160公里的离子喷气发动机。
- However, OFDM is sensitive to synchronization error and channel estimation error and it has the weakness of the high Peak-to-Average Power Ratio (PAPR) of the transmitted signal. 但是,OFDM不仅对于同步误差和信道估计误差非常敏感,而且还伴随发射信号高峰平比(PAPR)的缺点。
- The fascist soldier thrust his bayonet into the man's body. 那个法西斯士兵把刺刀刺入那人的身体。
- The invader thrust the blade of his bayonet into the woman's heart. 侵略兵把刺刀的刀身刺入那个妇人的心脏。
- One of the major drawbacks of orthogonal frequency division multiplexing (OFDM) is the high peak-to-average power ratio (PAPR) of the transmitted OFDM signal. 正交频分复用(OFDM)技术的一个主要缺点就是传输信号的峰值平均功率比(PAPR)较高。