当前位置：
首页 资源下载
搜索资源 - frequency modulation
搜索资源列表
-
0下载：
Orthogonal Frequency Division Multiplexing (OFDM) is a multicarrier modulation method with the initial idea to overcome multipath fading in a wireless environment. Multipath effect causes an unacceptable symbol in multiple copies but with a different
-
-
1下载：
本文介绍了一种控制对象以中小型UPS为模型的、基于TMS320F240的数字化控制平台的样机实验系统。经对比系统采用了单极性调制的SPWM方式，并根据核心处理芯片的各类资源给出了一套具体的软硬件数字化实现方案。系统硬件部分主要包括输出电压、输出电流、市电频率/相位等各类信号的采集和处理，以及输出PWM信号的隔离、驱动等。系统软件部分则包括UPS各种系统功能的实现，其中主要研究了软件锁相环(市电跟踪)、有效值调节、各类保护、PWM波的生成、闭环控制等的实现。-This article descri
-
-
0下载：
数字信号的传输方式分为基带传输和带通传输，在实际应用中，大多数信道具有带通特性而不能直接传输基带信号。为了使数字信号在带通信道中传输，必须使用数字基带信号对载波进行调制，以使信号与信道的特性相匹配。这种用数字基带信号控制载波，把数字基带信号变换为数字带通信号的过程称为数字调制。通常使用键控法来实现数字调制，比如对载波的振幅、频率和相位进行键控-The transmission mode of the digital signal is divided into a base-band trans
-
-
0下载：
数字信号的传输方式分为基带传输和带通传输，在实际应用中，大多数信道具有带通特性而不能直接传输基带信号。为了使数字信号在带通信道中传输，必须使用数字基带信号对载波进行调制，以使信号与信道的特性相匹配。这种用数字基带信号控制载波，把数字基带信号变换为数字带通信号的过程称为数字调制。通常使用键控法来实现数字调制，比如对载波的振幅、频率和相位进行键控-The transmission mode of the digital signal is divided into a base-band trans
-
-
0下载：
The demand of high data rate services has been increasing very rapidly and there
is no slowdown in sight. We know that the data transmission includes both wired
and wireless medium. Often, these services require very reliable data transmission
-
-
0下载：
The demand of high data rate services has been increasing very rapidly and there
is no slowdown in sight. We know that the data transmission includes both wired
and wireless medium. Often, these services require very reliable data transmission
-
-
0下载：
The demand of high data rate services has been increasing very rapidly and there
is no slowdown in sight. We know that the data transmission includes both wired
and wireless medium. Often, these services require very reliable data transmission
-
-
0下载：
The demand of high data rate services has been increasing very rapidly and there
is no slowdown in sight. We know that the data transmission includes both wired
and wireless medium. Often, these services require very reliable data transmission
-
-
2下载：
齿轮发生裂纹故障时其振动信号会产生调制现象,包括幅值调制和频率(相位)调制两部分。目前调幅信号的解调分析已经比较成熟,但对于调频信号的解调方法研究还不够完善。全面系统介绍了近年来处理调频信号
中最常用的希尔伯特相位解调和循环平稳解调两种方法-Gear crack fault occurs when the vibration signal will produce modulation phenomenon, including the two parts of the modulation
-
-
0下载：
根据FSK调制原理
在二进制频移键控中，幅度恒定不变的载波信号的频率随着输入码流的变化而切换（称为高音和低音，代表二进制的1和0）。来做实验
-According to the principle of FSK modulation in the binary frequency shift keying, the frequency of the carrier signal amplitude constant with the change of the input stream
-
-
0下载：
Orthogonal Frequency Division Multiplex or OFDM is a modulation format that is finding increasing levels of use in today s radio communications scene. OFDM has been adopted in the Wi-Fi arena where the 802.11a standard uses it to provide data rates u
-
-
0下载：
BPSK,DPSK调制与解调，分别采用不同的载波频率进行调制观察载波频率对解调的影响-BPSK, DPSK modulation and demodulation, respectively, using a different carrier frequency of modulation observed carrier frequency of the demodulated
-
-
0下载：
Orthogonal Frequency Division Multiplex or OFDM is a modulation format that is finding increasing levels of use in today s radio communications scene. OFDM has been adopted in the Wi-Fi arena where the 802.11a standard uses it to provide data rates u
-
-
0下载：
快跳频系统， 数据采用MFSK调制 ，调频程序-Fast frequency hopping systems, data MFSK modulation, FM program
-
-
0下载：
信号幅度调制的方法；用时域和频域的方式表示幅度调制的结果。
-Signal amplitude modulation method time-domain and frequency domain representation of amplitude modulation of the results.
-
-
0下载：
采用MFSK调制的快速跳频通信系统，分析了各个阶段的频谱图-Using MFSK modulation of fast frequency hopping
-
-
0下载：
In telecommunications, direct-sequence spread spectrum (DSSS) is a modulation technique. As with other spread spectrum technologies, the transmitted signal takes up more bandwidth than the information signal that modulates the carrier or broadcast fr
-
-
0下载：
This example of AC-DC-AC converter illustrates use of Universal Bridge, Multimeter, and Powergui blocks, as well as discrete control blocks of the Extras library.-A 60 Hz, voltage source feeds a 50 Hz, 50 kW load through an AC-DC-AC converter. The 60
-
-
0下载：
载频为10HZ、采样速率为40HZ的fsk信号的产生和调制-The carrier frequency the 10HZ, sampling rate 40HZ fsk signal generation and modulation
-
-
0下载：
已知消息信号为一个长度为8的二进制序列；载波频率为 ，采样频率为4KHz。编程实现一种调制、传输、滤波和解调过程。-Known message signal is a binary sequence with a length of 8 the carrier frequency, the sampling frequency of 4KHz. Programming a modulation, transmission, filtering, and demodulation process
-
