Characteristics of orthogonal slow frequency hopping/16-quadrature amplitude modulation system with an interference immunity decoding method for digital land mobile communications

1996 ◽  
Vol 79 (10) ◽  
pp. 101-111
Author(s):  
Kiyoshi Hamaguchi ◽  
Hideichi Sasaoka
Keyword(s):  
Mobile Communications ◽  
Amplitude Modulation ◽  
Frequency Hopping ◽  
Quadrature Amplitude Modulation ◽  
Interference Immunity ◽  
Slow Frequency

scholarly journals Digital Demodulator of the Quadrature Amplitude Modulation Signals

2018 ◽  
Vol 18 (6) ◽  
pp. 236-242
Author(s):  
Oleg Chernoyarov ◽  
Alexey Glushkov ◽  
Vladimir Litvinenko ◽  
Yuliya Litvinenko ◽  
Boris Matveev
Keyword(s):  
Amplitude Modulation ◽  
Hardware Implementation ◽  
Phase Locking ◽  
Statistical Simulation ◽  
Quadrature Amplitude Modulation ◽  
Programmable Logic ◽  
Interference Immunity ◽  
Programmable Logic Devices ◽  
Signal Period ◽  
Digital Algorithm

Abstract In this paper, the digital algorithm and the device for the demodulation of the quadrature amplitude modulation signals are considered. The fundamental advantages of our approach are simple hardware implementation, minimal number of arithmetic operations required over the signal period as well as the potential interference immunity in the presence of Gaussian noise. The expressions have been found for the error probability and their inaccuracy has been estimated. By means of the statistical simulation methods, the practical interference immunity of the introduced demodulator, together with the influence of phase locking errors have been tested. The introduced demodulator can be implemented either as a device independent from the programmable logic devices, or as an installation unit of the receiver equipment.

Synthesis of 16 Quadrature Amplitude Modulation Using Polarization-Multiplexing QPSK Modulator

2011 ◽  
Vol E94-B (7) ◽  
pp. 1809-1814 ◽  
Author(s):  
Isao MOROHASHI ◽  
Takahide SAKAMOTO ◽  
Masaaki SUDO ◽  
Atsushi KANNO ◽  
Akito CHIBA ◽  
...  
Keyword(s):  
Amplitude Modulation ◽  
Quadrature Amplitude Modulation ◽  
Polarization Multiplexing
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