The waveform generator is composed by DSP and quadrature digital upconverter ( QDU). DSP is used as main controller to decide the modulation mode and output waveform of QDU. 波形产生器主要由DSP和数字上变频器构成,DSP作为主控制器设定数字上变频器的调制方式和输出波形。
Modulation Identification of Communication Signal Based on DSP Improvement on Communication Signal Modulation Mode Identification Based on Spectral Correlation 基于DSP的通信信号调制方式识别改进的通信调制信号谱相关识别方法
According to torque ripple of brushless DC motor, the different PWM modulation mode and overlapping commutation method are used to minimize torque pulsation when current commutation is considered. 针对无刷直流电动机的转矩脉动,提出采用不同的PWM调制方式以及不同的重叠换相角减小换相电流所引起的转矩脉动。
QPSK modulation mode of Hamming encoding different signal to noise ratio in the quality of communication. 分析QPSK调制方式下Hamming编码方式在不同信噪比下的通信质量。
A new method of wide swath SAR based on multiple modulation mode is presented in this paper. 该文论述了一种基于多调制方式的宽测绘带方法。
Based on the modularized ASI, cascade inverter topology structure and modulation mode is introduced in this paper. 本文基于一种以级联逆变器为核心的模板化航空静止变流器,介绍了级联逆变器的拓扑结构,其具有模块化程度高、能量分布变换和高效率等优势。
Amplitude modulation mode of analog video signal transition; 模拟视频信号的调幅方式传输;
The harmonic characteristics of unipolar, bipolar SPWM wave of single phase, three phase inverter are analyzed. It provides the technical reference for harmonic suppression and filter network design as well as the modulation mode definition. 详细讨论了单相、三相逆变器的单极、双极性SPWM波形的谐波特性,为谐波抑制和滤波网络的设计以及调制模式的确定提供了参考。
Digitalizing includes modulation mode digitalized and equipment all digitalized. Aiming at this characteristic, this thesis research in carrier synchronization and signal demodulation of new generation space TTC system. 数字化包括调制方式的数字化和设备的全数字化,本文就结合这一特点对新一代航天测控系统中载波同步和信号解调进行了研究。
Digital Correlator has different realizing structure for different modulation mode and data frame. 对于不同的调制方式和不同的数据帧结构,数字相关器的实现方案有很大不同。
Compare OFDM to FM ( modulation mode of UM2000) without changing the bandwidth, symbol period and carrier frequency, and make emulational analysis of the transmitted information by OFDM modulation. 在不改变带宽、符号周期和载频的情况下,将OFDM与FM(UM2000系统中所采用的调试方式)进行了分析比较,并对所传信息以OFDM调制方式进行了仿真分析。
The author studies recognition of signal modulation mode in OFDM system according to the diversity of communication signal types and modulation modes and the complexity of wireless signal channel environment. 针对通信信号种类和调制方式的多样性、以及无线信道环境的复杂性,研究了自适应OFDM系统中信号调制方式的识别。
The pulse area modulation mode in the fields of high power factor convertor was applied to current source inverter, the lower harmonic waves in output current is effectively controlled. 把高功率因数变换器领域中所研究的脉冲面积调制法引入到电流逆变器的控制中,有效地抑制了输出电流中的低次谐波。
The rate control is implemented via changing the modulation mode of physical layer. 通过改变物理层不同的调制方式实现传输速率控制。
The PAPR performances of SC-FDMA signals in different modulation mode are simulated and analyzed by adjusting the pluse shaping filter roll-off factor and numbers of system subcarriers. At the same time, the PAPR performance of OFDMA system is compared. 仿真中通过调整脉冲成形滤波器的滚降系数和系统子载波数目,分析其对SC-FDMA信号PAPR特性的不同影响,并与OFDMA系统进行了PAPR的仿真比较。
The instantaneous phase under the conditions of low SNR can be obtained with this method. Second, the identification of the radar signal modulation mode is also discussed in this dissertation, and a complete identification process is put forward. 这种方法可以在较低信噪比条件下得到信号的瞬时相位。其次,本文对雷达信号的调制方式识别进行了研究,并给出了一个完整的识别方案。
In this paper, through the analysis of the three types of modulation, FSK modulation mode is selected according to the needs of the practical application. 本文从这三种调制方式入手,根据实际应用的需求选定FSK调制模式,通过对其存在的不足进行分析,提出改进,由此引出了MSK的定义。
The PMD adaptive compensation scheme with the recognition function of signal modulation mode has been first put forwarded. 提出一种带有信号调制格式识别功能的PMD自适应补偿方案。
The related parameters of OFDM modulation technology for low-frequency elastic wave channel is obtained according to the model, meanwhile, the corresponding digital modulation mode is selected. 根据相关资料,建立了一个信道模型,根据模型求得了低频弹性波信道OFDM调制技术的相关参数,并选定了相应的数字调制方式。
An AC-DC type CPT system structure based on envelope modulation mode is presented. An energy injection AC-AC type topology is proposed for the structure. Its system characteristics are analyzed. 提出了基于包络线调制传输模式的AC-DC型非接触电能传输系统结构,给出了一种适用于该结构的能量注入式AC-AC变换拓扑,分析了该拓扑的系统特性。
This paper mainly studied hardware platform of signal modulation mode identification which based on software radio, detailed introduces the hardware composition and software and hardware development drive configuration, and the experimental process problems should be paid attention to. 本文重点研究了基于软件无线电思想搭建的信号调制方式识别的硬件平台,详细介绍了该系统的硬件组成和软硬件开发驱动配置以及实验过程中应注意问题。
The mathematic model of the designed circuits can facilitate the choice of pulse coding and modulation mode for the non-crosstalk ultrasonic ranging system, so the cumbersome hardware verification can be avoided, which meets the need of theoretic study and simulation work. 此模型的建立可便于无串扰超声测距系统对脉冲编码和调制方式的选择,省去了繁琐的硬件验证,可满足理论研究和仿真的需要。
In this paper, two important aspects of the structural control of the way-the choice of modulation mode and capacitor voltage balance control method, conducted in-depth study and discussion. 本文针对该结构控制方式的两个重要环节&脉冲调制方式的选择与系统级控制方法,进行了深入的研究和讨论。
In the hardware is given, channelized is realization with multiphase filter structure, signal feature parameters is extraction based on the CORDIC algorithm and the process of simulation and experimental results is given of modulation mode identification. 给出了在该硬件平台下,基于多相滤波结构的信道化实现、基于CORDIC算法对信号瞬时特征参数提取的实现以及调制方式识别的仿真过程和实验结果。
This thesis point out some problems met in the adaptive coded modulation on OFDM sub-band and introduce several switching algorithm on coded modulation mode with some analysis and comparison. 本文首先指出在对OFDM子带进行自适应编码调制时面临的问题,随后介绍了几种应对此问题的编码调制方式切换算法,并对其做了分析了比较。
The dissertation firstly introduce the system architecture and principle of the microwave photonic phase shifter based on the suppression of the optical carrier single-sideband modulation mode, verify the feasibility by experiments, point out the deficiencies of the scheme and propose the improved measure. 论文首先对基于抑制光载波的单边带调制方式的微波光子移相方案进行系统结构介绍和原理分析,并通过实验验证方案的可行性,指出了方案的不足,并提出了改进措施。
This paper then brief introduced the modulation mode of signal and related theory of modulation mode identification. 简要介绍了信号的调制方式和调制方式识别的相关理论。
The DC-DC switch power supply of the basic principles, including four basic topology structures, modulation mode and feedback control method are also studied. 研究了DC-DC开关电源的基本原理,包括四种基本拓扑结构、调制方式以及反馈控制方式。
LTE system adopts OFDM as the modulation mode, which is an inconstant envelope modulation; and so on impose higher requirements on the linearity of power amplifiers. LTE系统中下行方案采用了非恒定包络调制方式的正交频分复用技术,该技术对功率放大器的线性度有很高的要求。