Quincy returned at this very juncture. 正在这个节骨眼上,昆西回来了。
Upper and lower adjacent channel protection margins 上、下邻频道保护裕度
Voltage present on one channel can easily be coupled to an adjacent channel and may cause significant errors. 某个通道上出现的电压很容易耦合到相邻通道,并且会引起明显的误差。
Adjacent channel interference when two or more carrier channels are placed too close together in the frequency spectrum, they interfere with each other and mess up each other's conversations. 邻道干扰频谱中,当两个或两个以上的载波信道相隔太近,他们将互相干扰并影响对方信道的会话。
The mathematical models of co-channel, adjacent channel interference among the duplex mobile communication systems 双工移动通信系统间的同波道、邻道干扰模型
As one of the strongest nonlinear devices, power amplifiers affect the communication systems directly, whose nonlinear distortions result in spectrum expansion and adjacent channel interference, then worsen the bit error rate. 功率放大器(PA)是通信系统中非线性最强的器件之一,其非线性失真将导致频谱扩展而干扰邻道信号并恶化误码率。
Study on interference of adjacent channel in seismography 关于地震仪邻道干扰的研究
This paper analyzes the influence of the delay estimation error on the performance of the predistorter. The evaluation criteria are the adjacent channel power ratio ( ACPR) and the normalized mean square error ( NMSE). 该文以邻近信道功率比(ACPR)和归一化均方误差(NMSE)两项指标作为衡量标准,研究了延时估计误差对间接学习结构预失真器补偿性能的影响。
The paper made to analyze and study the technology about adjacent channel and additional Channel in CATV System. 对有线电视传输系统的邻频传输技术以及增补频道等电视扩容技术进行分析和研究。
A relative complete baseband equivalent model for MQAM digital mobile communication system is described in this paper, which includes frequency selective Rayleigh fading channel, co-channel interferences, adjacent channel interferences and additive white Gaussian noises. 本文导出了一种较完备的高效调制MQAM数字移动通信系统的基带等效模型。所考虑的移动通信系统中包含频率选择性多径瑞利衰落信道、同频道干扰、邻频道干扰和加性高斯白噪声。
In the wireless communication systems, the nonlinearity of high power amplifier ( HPA) cause spectral spreading and adjacent channel interference. 在无线通信系统中,高功率放大器因其具有非线性特性,会导致频谱再生和邻道干扰等问题。
The notch filter proposed is used to attenuate the adjacent channel interference in the Loran-C receiver. 本文设计的陷波器用于衰减罗兰C接收机的邻道干扰,而且其调谐是在微机管理下处自动进行的。
It is very important problem to achieve adjacent channel duplex in radio communication, that result in to eliminate the large signal blocking interference from local transmitter in reciever. 实现邻道双工通信,即消除本地发射机对接收机所产生的强信号阻塞干扰,是无线通信领域急待解决并有着十分重要意义的问题。
Reflection and scattering of ultrashort wave from stray Es ionosphere may probably arise co& channel or adjacent channel interference not only in wave band of TV I, but also in FM. Es杂散电离层对超短波的反射和散射传播,不仅在电视Ⅰ波段,而且在调频波段都有可能产生同、邻频干扰。
The main parts of the system are designed and implemented, such as: Single Zero IF Tuner, Program Filter based FPGA and DSP, QAM Modulator, Digital Quadrature IF Modulate, and Adjacent Channel Modulator. 设计和实现了构成系统的主要单元:单片零中频调谐器、基于FPGA通用DSP的节目过滤器、QAM调制器、正交数字中频调制器、捷变型RF调制器、主控单元等部分的硬件电路;
The interference of adjacent channel is eliminated, the accuracy is improved. 从而彻底解决了相邻通路间的干扰,提高了测量精度。
TWTA ( Traveling-wave tube amplifier) is one of the most important HPA components in satellite communication system. The nonlinear feature of TWTA results in the creation of intermodulation, which can cause intermodulation distortion, adjacent channel interference, and affects the performances of communication system. 行波管功率放大器(TWTA)是卫星通信星载系统中重要的高功放元件,TWTA的非线性特性会使多载波信号产生交调成份,导致交调失真、邻道干扰,影响通信系统的性能。
The circuit principle of a adjacent channel TV modulator which processed by RF is analysed, and the spurious out-of-band component suppression technology and the appliance of SAWF, which fit to adjacent channel TV signal transmitting, are expounded. 分析了一种射频处理邻频电视调制器的电路原理,阐述了为满足邻频电视信号传输要求而采取的带外寄生分量抑制技术及SAWF的应用。
The elimination of the adjacent channel interference solves the problem which is inevitable in actual application of the transient detecting method. 将这一方法应用于瞬态检测实验系统,取得了预期的效果,解决了瞬态检测理论在实际应用中所遇到的关键问题。
Adjacent channel include adjacent frequency band, adjacent time-slot and adjacent airspace. 相邻信道包括相邻频带、相邻时隙和相邻空间。
When PA output power is increasing to non-linear zone, PA output signal will deviate from ideal linear curve which leads to signal quality decreasing and adjacent channel interference. 当输出功率增加至非线性区间时,放大器的输出信号与理想线性性能曲线发生偏离,从而导致信号质量下降和邻带干扰。
The design of multi-wavelength optical transmitter mainly consisted of channel independence design and consistency design; adjacent channel crosstalk can be used to evaluate the performance of design. 多波长光发送模块的设计包括通道独立性设计与一致性设计,并利用相邻信道串扰对设计进行性能评测。
Compared with the other ranging methods, PN code ranging signal has advantages such as, low power spectral density, small interference on adjacent channel, strong confidentiality, being difficult to be intercepted, applying in CDMA system. 与其他测距方法相比,伪码测距具有信号功率谱密度低、对邻近信道干扰小、保密性强难以被截获、可以实现码分多址等优势。
In order to realize practice-oriented initialization, selection, crossover, mutation and adjustment processes, we take advantage of the genetic algorithms to encode cells and their frequency needs and use adjacent channel interference between cells as a fitness function. 本文中遗传算法对小区及其频点需求进行编码,以小区之间同邻频干扰和作为适应度函数,实现了面向实际应用的初始化、选择、交叉、变异和调整等过程。
And this paper has main three tasks as below. 1. Research and analysis the indicators of base station RF receiver system, including the reference sensitivity, intermodulation characteristics, adjacent channel selectivity, blocking characteristics, dynamic range and AGC systems. 2. 此研究与设计主要分为以下三个方面:1、基站接收机系统射频指标的研究与分析,包括参考灵敏度、互调特性、邻道选择性、阻塞特性、动态范围和AGC系统等。
RF power amplifiers is a indispensable module in modern communication systems, its inherent nonlinear characteristics would lead to signal distortion and adjacent channel interference. 射频功率放大器是现代通信系统中不可缺少的重要模块,其固有的非线性特性会导致信号失真与邻道干扰。
Firstly, in the research of adjacent channel interference from the LTE system to the digital broadcasting television system, an improved simulation method is proposed. 首先,在LTE系统干扰数字广播电视系统的仿真研究中,本文提出了一种改进型仿真方法。
The tests show that, adjacent channel interference has been greatly improved. 经测试表明,邻信道干扰有较大的改善。
The modeling performance is assessed in terms of in-band and out-of band errors, such as normalized mean square error and adjacent channel error power ratio, and it is compared with a conventional NARMA, a memory polynomial with respect to accuracy and computation complexities. 广义NARMA模型性能通过使用归一化的均方误差和邻道误差功率比等带内和带外失真误差进行评价,并且在计算精度和计算复杂性方面和传统的NARMA模型及记忆多项式模型进行比较。