So its naissance brings a lot of hope and promotion to application and deploitation of milimeter and submilimeter - wave . because of gyrotron , s superiority of high peak power and average power among many known milimeter and submilimeter - wave gyrodevices , it has been paid much respect in the world for application in many areas such as plasma heating , rf accelerator , millimeter radar , dew and so on 由于回旋管具有在毫米、亚毫米波段其它器件无可比拟的高峰值功率、高平均功率的优越性,因此在受控热核聚变等离子体的回旋管加热( ecrh ) 、电子高能rf加速、雷达系统、通信系统以及定向武器( dew )等方面都有着广阔的应用前景。
This dissertation researches on wavelet theory applied to information transmission , including cdma spreading code design , waveform coding in digital modulation , over - saturated multi - access communication , diversity techniques for multi - path fading channels , and peak - to - average power ratio ( papr ) reducing methods for the wavelet packet modulation signals , etc . 本文以子波理论为工具,较深入地研究了信道传输方面的几个问题,内容包括cdma扩展码的设计、数字基带波形成形技术、过饱和多址通信、克服衰落的分集技术和减小子波包调制信号的峰值功率/平均功率比值的方法等。
At the same time , a simple channel estimator that can suppress the peak - to - average power ratio ( papr ) for ofdm system with multiple transmitter antennas is proposed , its simulation proves again the result . ( 5 ) ofdm receiver is proposed with multiple transmitter antenna and alamouti scheme 结果表明,多个独立天线ofdm系统的性能明显优于单天线的ofdm系统;同时还给出了一种简单的能有效抑制峰值功率平均功率比( papr )且适于多发射天线ofdm系统的导频符号辅助的信道估计方法,仿真结果再次证明了上述结论。
Traditional ac averaged power theory , instantaneous reactive power theory and the relative reactive and harmonic current detection methods are systematically studied . then it is revealed that the reactive and harmonic current detection method based on the instantaneous reactive power theory is the same as the method based on the averaged power theory in the essence under the condition of mainline voltage and load current are both distorted 通过对交流平均功率理论、瞬时无功理论和相关的无功谐波电流检测方法的系统分析研究,认证了在电网电压和电流均畸变的条件下,基于瞬时无功理论的无功谐波电流检测方法等同于基于平均功率理论的无功谐波电流检测方法的物理本质。
Space - time block codes ( stbc ) based on orthogonal design has attracts enough attentions in its applications in mimo - ofdm systems for its full diversity exploiting and low coding / decoding complexity . these applications include not only system performance improvement , but also reduction of the peak to average power ratio in mimo - ofdm systems . under these backgrounds , this paper first studies space - time block codes under the single carrier , flat fading situation , discusses the encoding / decoding principle and its performance under different channels . then , the author focused on the performance of space - time codes under time selective and frequency selective channels , uncovered the fundamental cause of how maximum doppler shift and power delay profile influences the performance of space - time codes through deduction and simulation 在上述背景下,本文以单载波,平坦衰落信道下的空时分组码为切入点,深入分析了其编译码原理和在不同信道情况下的性能;以此为基础,后文展开了对空时分组码在多载波,时间选择性和频率选择性衰落信道下的性能研究,通过理论推导和充分的仿真,揭示了空时/频分组码在时频选择性衰落信道中的性能变化的根本原因;在以上对多载波系统中空时分组码的研究的过程中,作者发现了空时分组码在降低系统峰平比方面应用的可行性,提出了一种降低峰平比的新方法。
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)