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- 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。
- 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
- 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。
- 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。
- 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。
- When the sampling rate increases, the correlation increases quickly and the peak-to-average power ratio of oversampling OFDM signal changes neglectably. 随着过采样率增加,采样点之间相关性迅速上升,新增加采样点对信号峰值平均功率比的影响下降。
- The king was shorn of his power by his nobles. 国王被手下的贵族们剥夺了权力。
- The superiority of the method is the pectinate filter characteristic, that is, the power ratio of the two output arms changes fast with the Bragg wavelength while in the rising or falling edge of the output spectrum. 该方法主要是基于 MZ 干涉仪的梳状滤波特性,即在输出光谱的上升或下降沿两输出臂的功率比值随波长变化很快,通过调整干涉仪臂长差,得到具有陡峭边沿的滤波器。
- However, the high peak-to-average power ratio (PAPR) of MC-CDMA signals results in nonlinear distortion and degradation of bit error ratio (BER) performance, which is the obstacle of utilities of MC-CDMA. 但是,MC-CDMA信号的高峰均功率比(PAPR)会导致非线性失真及误码率性能恶化,已成为MC-CDMA技术实用化的最大障碍。
- With respect to the problem of high Peak-to-Average Power Ratio(PAPR) of Orthogonal Frequency Division Multiplexing(OFDM),an improved reducing PAPR method by reversed subcarriers is presented. 针对正交频分复用系统(OFDM)所具有的高峰均比问题,提出了一种改进的预留子载波降低OFDM系统峰均比功率的方法。
- Post simulation shows the PA exhibited a power-added efficiency of 44.8%,a gain of 27.4 dB,and an adjacent channel leakage power ratio at a 1.25-MHz offset frequency of-47.9 dBc at a out of 28 dBm with 1.228 8-Mcps HPSK modulation. 考虑了寄生效应的后仿真结果表明;该功率放大器在1 850MHz;码片速率为1.;228 8Mcps的混合移相键控调制信号的激励下;在CDMA2000系统要求的最大输出功率28dBm处PAE达到44
- Open tender for purchasing power transformer. 公开招标购买电力运输设备。
- The moving average length of channel estimator and the pilot to data channel power ratio are optimized analytically under the criterion of minimum bit error probability (BEP) for given signal to noise ratio (SNR). 根据给定信噪比下误码概率最小的准则 ,本文得到了理论上信道估计器最佳的平均长度和导频信道相对数据信道最优的功率比
