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SPREAD SPECTRUM MODULATION TECHNIQUES
-spread spectrum - those modulation methods that are producing a signal whose
spectrum is more wider than of the data signal, the occupied frequency band being
independent by the signal of data band.
-The sig
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GMSK是高斯滤波的最小频移键控的简称,基本的工作原理是将基带信号先经过高斯滤波器成形,再进行最小频移键控(MSK)调制。由于成形后的高斯脉冲包络无陡峭边沿,亦无拐点,因此频谱特性优于MSK信号的频谱特性。-GMSK Gaussian filter is the smallest FSK abbreviation, the basic working principle is to base-band signal to pass Gaussian filter shape, and then
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雷达系统仿真,发射信号为13位巴克码和线性调频混合调制的信号-Radar System Simulation, firing signal for the 13 Barker code modulation and linear frequency modulation of mixed signal
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本设计采用AT89552单片机,辅以必要的模拟电路,实现了一个基于直接数字频率合成技术(DDS)的正弦谊号发生器。设计中采用DDS芯片AD9850产生频率1KHZ~10MHZ范围内正弦波,采用功放AD811控制输出电压幅度, 由单片机AT89S52控制调节步进频率1HZ。在此基础上,用模拟乘法器MC1496实现了正弦调制信号频率为1KHZ的模拟相度调制信号;用FPGA芯片产生二进制NRZ码,与AD9850结合实现相移键控PSK、幅移键控ASK、频移镇键FSK。-AT89552 the singl
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本系统以51单片机及FPGA为控制核心,由正弦信号发生模块、功率放大模块、调幅(AM)、调频(FM)模块、数字键控(ASK,PSK)模块以及测试信号发生模块组成-The system of 51 single-chip and FPGA for the control of the core module by the sinusoidal signal, power amplifier module, AM (AM), frequency modulation (FM) module, dig
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利用时-频方法实现调制信号的识别,并给出正确识别率-CLASSIFICATION OF MODULATION MODES
USING TIME-FREQUENCY METHODS
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本文结合L FM 信号脉冲压缩及旁瓣抑制,利用
GUIDE 制作线性调频信号脉冲压缩模块的图形用户界面,使利用此界面可以通过对雷达脉压模块输入参数的修改,对仿真结果给出图形显示和结果分析,界面友好,具有开放性,方便实用和完善及扩充其功能。-This article unifies L the FM signal pulse compression and side-lobe cancellation, uses the GUIDE manufacture linear frequency m
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单工无线呼叫系统分发射和接收两大部分。发射部分采用锁相环式频率合成器技术, MC145152和MC12022芯片组成锁相环,将载波频率精确锁定在35MHz,输出载波的稳定度达到4×10-5,准确度达到3×10-5,由变容二极管V149和集成压控振荡器芯片MC1648实现对载波的调频调制;末级功放选用三极管2SC1970,使其工作在丙类放大状态,提高了放大器的效率,输出功率达到设计要求。接收部分以超大规模AM/FM立体声收音集成芯片CXA1238S为主体,灵敏度、镜像抑制、信噪比等各项性能指标均达
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Abstract—In this paper we present an initial performance
evaluation of the 3GPP UTRA Long Term Evolution (UTRA
LTE) uplink with baseline settings. The performance results
are obtained from a detailed UTRA LTE uplink link level
simulator suppo
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:为了论证高斯最小频移键控(GMSK)信号在时域和频域的相互关系,分析了GMSK信
号调制原理和滤波器传递函数,建立了GMSK调制和解调模型。-: In order to demonstrate Gaussian Minimum Shift Keying (GMSK) signal in time domain and frequency domain, the relationship between the analysis of GMSK signal modulation princ
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利用MATLAB强大的图形处理功能,符号运算功能和数值计算功能,实现连续时间非周期信号频域分析的仿真波形;
1、用MATLAB实现典型非周期信号的频域分析;
2、用MATLAB实现信号的幅度调制;
3、用MATLAB实现信号傅立叶变换性质的仿真波形;
-The use of MATLAB powerful graphics processing capabilities, symbolic computing and numerical computing capabilitie
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设计一个2FSK数字调制系统,要求:
(1)设计出规定的数字通信系统的结构;
(2)根据通信原理,设计出各个模块的参数(例如码速率,滤波器的截止
频率等);
(3)用Matlab或SystemView 实现该数字通信系统;
(4)观察仿真并进行波形分析;
(5)系统的性能评价。
-Design a digital modulation system 2FSK require: (1) design a digital communication system
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什么是信号调制?在测控系统中为什么要采用信号调制?什么是解调?在测控系统中常用的调制方法有哪几种?
-Coherent detection of fsk
Fsk modulation is characterized by the information being contained in the frequency of the carrier. What is the signal modulation? Has to use the signal modulation why i
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Differential Space-Time-Frequency Codes for
MB-OFDM UWB with Dual Carrier Modulation
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航空航天通信技术一般采用模拟通信的频率调制和数字通信的移相键控调制方法。这有利于充分应用信道带宽和能源。频率调制是在一定程度上改变载波或副载波的频率来传输信息的调制方法。移相键控调制是利用载波或副载波的相位跳变来传输信息的调制方法。移相键控又分二相移相键控、四相移相键控和多相移相键控,其中以四相移相键控和八相移相键控调制方法的效率较高-Aerospace communications technology commonly used analog communication of frequen
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Just-In-Time Gain Estimation of an RF Digitally-Controlled Oscillator for Digital Direct Frequency Modulation
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Frequency Modulation radio Circiuts
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best Frequency Modulation
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This tutorial is part of the National Instruments Measurement Fundamentals series. Each tutorial in this series teaches you a specific topic of common measurement applications, by explaining the
theory and giving practical examples. This tutorial c
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Frequency Modulation(FM),FSK and MSK
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