PLL-QPSK,phased-locked loop quadrature phase shift keying

Modeling and designing based on FPGA for digital QPSK modulator and demodulator

基于FPGA的四相移键控调制解调器的建模与设计

A new OCDM technology of QPSK coherent phase encoding in time domain for Tbit/s ultra-fast optic fiber transmission system is proposed　according to family a of 4-phase sequences, which can improve the transmission rate and spectral efficiency greatly.

介绍了光码分复用(OCDM)的原理,分析比较了常用OCDM技术的优缺点,根据四相位序列中的A序列提出了用四相相移键控(QPSK)实现时域相干相位编码的OCDM新技术,并通过数值模拟计算选出了相关特性好的4个码组,用于实现Tbit/s超高速光纤传输实验系统,可大大提高传输速率及频带利用率。

The technology of complete digital QPSK(Quaternary Phase Shift Keying) modulation and demodulation is suitable for the digital communication in the future for its flexibility and versatility.

数字信号的四相相移键控调制与解调技术以其灵活性和通用性而得到广泛的应用,符合未来数字通信技术发展的方向。

In order to study the ambiguity function character of the QPSK radar signal to help the choice and design of the radar signals,the paper has built models by Simulink to simulate two different modulation ways that produce the QPSK signals,and then leads the signals\' data to the Matlab\'s workspace and plots the ambiguity diagram respectively.

为便于雷达信号的选择与设计,从研究四相移相键控(QPSK)雷达信号的模糊函数特性入手,通过Simulink建模和仿真2种不同的产生QPSK信号的调制方法,并将信号数据导入到Matlab的工作空间中,由Matlab分别画出其模糊函数图;指出并论证了与2路码长互素码速率相同的BPSK正交构成QPSK的调制方法相比,直接QPSK调制方法的优越性。

The construction method and recent progresses of incoherent two-dimensional FBG E/D, amplitude modulation superstructure fiber Bragg grating (SSFBG) E/D, coherent binary phase shift keying (BPSK) SSFBG E/D, reconfigurable quarternary phase shift keying (QPSK) SSFBG E/D are discussed.

分别给出了非相干光二维FBG编/解码器、振幅调制超结构光纤布喇格光栅(SSFBG)编/解码器、相干光二进制相移键控(BPSK)SSFBG编/解码器、可重构四进制相移键控(QPSK)SSFBG编/解码器的构造方法和最新研究进展,并分析了几种编/解码器的优缺点。

Modeling and designing based on FPGA for digital QPSK modulator and demodulator

基于FPGA的四相移键控调制解调器的建模与设计

quarter phase-shift-keying modulator

二相移相键控调制器

phase comparison sinusoidal frequency shift keying

相位比较正弦移频键控

frequency shift keying

键控频移频移键控频移键位

frequency differential phase shift keying demodulator

频率差分移相键控解调器

Feature Extraction of MPSK Signal;

相移键控信号（MPSK）特征提取研究

Research on Carriere Stimation and Recovery of MPSK;

相移键控信号（MPSK）载波估计及恢复研究

Design of PSK-based Low Speed Digital Communication System;

基于相移键控方式的低速数字通信系统的设计

Research on Trellis-Coded Chaotic Shift Keying Communications;

基于网格编码的混沌移相键控通信研究

Frequency-domain equalization for continuous phase frequency shift keying

连续相位频移键控信号的频域均衡算法

minimum shift keying

最小转换键控最小频移键控

FSK tone detector

移频键控音频检波器

Analysis on transmission characteristics of differential phase shift keying signal of continuous pressure wave in drilling fluid channel

钻井液连续压力波差分相移键控信号的传输特性分析

Performance Research on 40 Gb/s DPSK Format Against Polarization-mode Dispersion

40Gb/s差分相移键控格式抗偏振模色散的性能研究

Performance of Optical Wireless Communication System Basing on the Sub-Carrier PSK Intensity Modulation and LDPC Code

基于副载波相移键控强度调制和低密度奇偶校验码的光无线通信系统性能

multiple frequency shift keying telegraph terminal

多频移频键控电报终端机

BCFSK (Binary Code Frequency Shift Keying)

二进制编码频率移位键控法

The Frequency-Shift Keying Signal Demodulation Research on LabVIEW

基于LabVIEW平台的键控移频信号解调研究