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- .FSK、PSK、ASK调制原理 在数字通信系统中，数字基带信号通常要经过数字调制后再传输。常见的调制方式有频移键控（FSK）、相移键控（PSK）、幅移键控（ASK）-. FSK, PSK, ASK modulation principle in digital communication systems, digital baseband signal is usually subject to digital modulation and then transmitted. Common m
GPS-Digital-Tracking-Loops-Design-for-High
- GPS信号的基带处理在IEEE发表的文章有关信号捕获和跟踪的-GPS baseband signal in the IEEE published articles related to signal acquisition and tracking of
baseband_detection_simulink
- In this simulink model , baseband binary detection is simulated .A rectangular pulse shaped signal is given as input to the detector.The received signal is matched filtered and down-sampled .The effects of symbol timing offset can be seen by varying
pam_detection_simulink
- In this simulink model , baseband 8-ary PAM detection is simulated .A half-sine pulse shaped PAM signal is given as input to the detector.The received signal is matched filtered and down-sampled .The effects of symbol timing offset can be seen by
matlabASKPSKFSK
- 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。-Transmission of digital signals into base band transmission and band-pass tr
System-Simulation-0f-CDMA2000
- 本程序仿真CDMA2000的复扩频过程,只考虑导频信道和一个业务信道,假设同步已建立，接收端能产生同频同相相干载波,整个仿真过程在基带中进行.-The simulation program CDMA2000 complex spread spectrum, considering only the pilot channel and a business channel, and assume that synchronization has been established, the rece
CAD
- 无线PPT遥控发送电路设计 这是一个2DPSK调制电路，2DPSK离不开二进制相移键控2PSK。 首先对二进制数字基带信号进行差分编码，将绝对码表示二进制信息变换为用相对码表示二进制信息， 然后再进行绝对调相，从而产生二进制差分相位键控信号. -Wireless remote control PPT send circuit design This is a 2 DPSK modulation circuit, 2 DPSK cannot leave the bin
2PSK
- 在二进制数字调制中，当正弦载波的相位随二进制数字基带信号离散变化时，则产生二进制移相键控(2PSK)信号。 通常用已调信号载波的 0°和 180°分别表示二进制数字基带信号的 1 和 0，用matlab实现其功能。-In binary digital modulation, phase when the sine wave with the discrete binary digital baseband signal changes, then generates a binary phase
FBMC
- /* A C++ version of Matlab's qamdemod(y, M, varargin) * Align each symbol to the nearest constellation points by minimum Euclidean distance. * The function only consider rectanglular constellation diagram and grey code. * The input is assum
PCM
- 在实际的调谐解调电路中，采用的是非相干载波解调，本振信号与发射端的载波信号存在频率偏差和相位抖动，因而解调出来的模拟I、Q基带信号是带有载波误差的信号。这样的模拟基带信号即使采用定时准确的时钟进行取样判决，得到的数字信号也不是原来发射端的调制信号，误差的积累将导致抽样判决后的误码率增大，因此数字QPSK解调电路要对载波误差进行补偿，减少非相干载波解调带来的影响。(In the actual tuning and demodulating circuit, non-coherent carrier