The output of the first delay circuit is multiplied by -1 within another weighting circuit and this multiplied output as well as the output of the third delay circuit are added together to generate a Q component level signal.doi:US5157344 AIchihara, MasakiUS...
4) digital quadrature coherent detector 数字正交相检5) orthogonal digital filters 正交数字滤波器 1. Based on dual orthogonal digital filters and weighted smoothing phase-difference method, an algorithm for tracking instantaneous frequency of power grid is proposed, which improves the dual orthogonal ...
1.The quadrature coherent detector is widely used in the field of signal processing since it can reserve all information about the complex envelope of IF signal.正交相干检波可以保留信号复包络的所有信息 ,因而在信号处理领域中有广泛的应用。 2.Considering that traditional digital quadrature coherent dete...
Synthetic quadrature phase detector/demodulator for Fourier transform spectrometers A method is developed to demodulate (velocity correct) Fourier transform spectrometer data that are taken with an analog to digital converter that digitize... J Campbell - 《Applied Optics》 被引量: 19发表: 2008年 ...
The present invention concerns a digital phase detector (PD) and also a method for digital phase detection, as can in particular be used e.g. in a so-called phase locked loop (PLL). According to the i
Digital-analog hybrid optical phase-lock loop for optical quadrature phase-shift keying We analyze a feasible high-sensitivity homodyne coherent optical receiver for demodulating optical quadrature phase-shift keying(QPSK). A fourth-power phas... 鲁绍文,周煜,朱福南,... - 《中国光学快报(英文版)》...
Two variations of quadrature phase shift keying (QPSK) have been devised to reduce phase changes between successive symbols and to prevent the carrier from going through zero amplitude during phase transitions. One of these is offset PSK. In this method, the I and Q data streams in the transmi...
PURPOSE: A digital quadrature demodulation device is provided where its DC offset is effectively controlled without increasing a complexity while realizing a hardware. CONSTITUTION: An A/D(Analog/Digital) converter(10) receives a receiving signal, and a matching filter(11) receives an output of the...
This paper proposes a new digital intermediate frequency (D-IF) demodulation scheme for /4 differential quadrature phase shift keying (DQPSK) modulation based on hard limiter. After converting the IF signal into a 2-level signal, all fol... XC Qing,LZ Ping,WT Wu,... 被引量: 3发表: 2005...
DIGITAL QUADRATURE GAIN AND PHASE ADJUSTMENT The digital quadrature gain and phase adjustment function enables compensation of the gain and phase imbalance of the I and Q paths caused by analog mismatches between DAC I/Q outputs, quadrature modulator I/Q baseband inputs, and DAC/modulator interface...