Frequency - domain equalization . at the same time discusses some key problems in ofdm : high ratio of peak - to - average power of output signals , problem of synchronization , channel estimation , adaptive bit , power and subcarrier allocation . emphasize on channel estimation , and present a new algorithm which can filtering more interpolation errors and noise . for the sake of improve the performance of resist narrowband noise and make efficient use of the spectrum apply malvar wavelet division 同时就ofdm系统中的一些关键问题如峰值平均功率比( papr )太高,同步问题,信道估计,信道、比特与功率必须动态分配进行了研究,着重研究了信道估计问题并提出一种改进的方法,能滤除更多的噪声分量和插值误差,提高系统的性能;为了提高抗窄带噪声的性能和提高信道利用率,用malvar小波变换实现了不等带宽分配。
Based on the requirement and target of the projects , firstly , pcf bragg grating are investigated theoretically and experimentally . moreover , the effects of filling high refractive index material ( nematic liquid crystal , nlc ) in pcfs on the transmission mechanism and propagation properties are studied by using plane - wave method and finite - element method ( fem ) , farther , several novel pcfs are proposed and designed . lastly , we propose and demonstrate a clad - pumped er3 + / yb3 + - codoped fiber laser , which integrate all performances of broad - band tunable wavelength , uniform output power spectrum , high repeat frequency and high average power to together 本论文选题于国家973 、 863以及国家自然科学基金等项目,结合课题的要求和主要目标,在对光子晶体光纤( pcfs )传输特性研究的基础上,首先对光子晶体光纤光栅进行了理论和实验研究;然后,采用平面波展开法和有限单元法分析了在光纤的空气孔中填充高折射率液晶对光纤传导机制和传输特性的影响,提出并设计了几种新型光子晶体光纤;最后,提出并研制成功连续可调谐、输出功率谱均衡的全光纤化、高功率包层泵浦铒镱共掺光纤激光器实验样机。
Based on the last research of ofdm algorithm of b3g , the paper studies and proposes ofdm windowing , peak average power rate rejection and shaping filter . this paper emphasizes on how to design and implement the digital system of the whole algorithm . after simulation , the design was downloaded to chips and makes the link implement successful 本论文在前期的ofdm算法基础上,加入了ofdm的加窗模块、功率峰均比抑制模块和同步码滤波处理模块,设计了整个算法的数字实现系统,并且经过仿真验证之后下载到芯片中成功地实现了整个链路的联调,性能满足设计需求。
average powerとは意味:平均電力{へいきん でんりょく} average power meaning:[Electronics] The average value of power in an ac circuit. In a resistive circuit, it is the square of the effective (rms) current times the resistance; P avg = ( I rms ) 2 R (for sine w...average power artinya:daya rerataaverage power перевод:средняя мощность (статистического критерия)