Bandpass filtering using quadrature modulation

1999 ◽  
Vol 46 (12) ◽  
pp. 1516-1518 ◽  
Author(s):  
S.N. Hazra
Keyword(s):  
Quadrature Modulation

An Extended Definition Television System Using Quadrature Modulation of the Video Carrier with Inverse Nyquist Filter

1987 ◽  
Vol CE-33 (3) ◽  
pp. 173-180 ◽  
Author(s):  
Yoshio Yasumoto ◽  
Sadashi Kageyama ◽  
Syuhji Inouye ◽  
Hideyo Uwabata ◽  
Yoshio Abe
Keyword(s):  
Quadrature Modulation ◽  
Television System

Complementary Coded CDMA with Multi-layer Quadrature Modulation

2022 ◽  
pp. 1-1
Author(s):  
Xiang Wang ◽  
Hsiao-Hwa Chen ◽  
Xiqing Liu ◽  
Qing Guo
Keyword(s):  
Quadrature Modulation

FPGA Adaptive Predistorter Based on 64QAM Modulation

2010 ◽  
Vol 56 (4) ◽  
pp. 387-392
Author(s):  
Janusz Pochmara ◽  
Piotr Katarzyński
Keyword(s):  
Computer Simulation ◽  
High Power ◽  
Point Of View ◽  
Quadrature Modulation ◽  
Programmable Logic ◽  
Logic Device ◽  
Rapid Convergence ◽  
High Power Amplifier ◽  
Nonlinear Distortions ◽  
Software And Hardware

FPGA Adaptive Predistorter Based on 64QAM ModulationThis paper presents a predistortion technique compensating for nonlinear distortions caused by HPA (High Power Amplifier) in a QAM (Multilevel Quadrature Modulation) system. Investigations were held both with software and hardware tools. It is confirmed by computer simulation that proposed approach produces a faster convergence speed than traditional computer performed algorithms. Predistortion technique based on programmable logic device is a very attractive from the implementation point of view, because of a low amount of required RAM and rapid convergence from a blind start.

scholarly journals A Pan-Function Model for the Utilization of Bandwidth Improvement and PAPR Reduction

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Yidong Xu ◽  
Wei Xue ◽  
Wenjing Shang
Keyword(s):  
Attenuation Factor ◽  
Average Power ◽  
Quadrature Modulation ◽  
Phase Shift Keying ◽  
Function Model ◽  
System A ◽  
Constant Envelope ◽  
Quadrature Phase ◽  
Shift Keying ◽  
Simulation Results

Aiming at the digital quadrature modulation system, a mathematical Pan-function model of the optimized baseband symbol signals with a symbol length of4Twas established in accordance with the minimum out-band energy radiation criterion. The intersymbol interference (ISI), symbol-correlated characteristics, and attenuation factor were introduced to establish the mathematical Pan-function model. The Pan-function was added to the constraints of boundary conditions, energy of a single baseband symbol signal, and constant-envelope conditions. Baseband symbol signals with the optimum efficient spectrum were obtained by introducing Fourier series and minimizing the Pan-function. The characteristics of the spectrum and peak-to-average power ratio (PAPR) of the obtained signals were analyzed and compared with the minimum shift keying (MSK) and quadrature phase-shift keying (QPSK) signals. The obtained signals have the characteristics of a higher spectral roll-off rate, less out-band radiation, and quasi-constant envelope. We simulated the performance of the obtained signals, and the simulation results demonstrate that the method is feasible.

Quasi-Quadrature Modulation Method for Power-Efficient Video Transmission Over LTE Networks

2014 ◽  
Vol 63 (5) ◽  
pp. 2083-2092 ◽  
Author(s):  
Taras Maksymyuk ◽  
Longzhe Han ◽  
Xiaohu Ge ◽  
Hsiao-Hwa Chen ◽  
Minho Jo
Keyword(s):  
Video Transmission ◽  
Modulation Method ◽  
Quadrature Modulation ◽  
Lte Networks ◽  
Power Efficient ◽  
Efficient Video
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