Modulation and Demodulation Circuitry

2007 ◽  
pp. 89-113
Keyword(s):  
Modulation And Demodulation

Research on the Technology of Low-Voltage Power Line Carrier-Current Communication Based on OFDM

2013 ◽  
Vol 397-400 ◽  
pp. 2004-2007
Author(s):  
Wen Yan Ding ◽  
Zhi Ning Sun ◽  
Xiang Long Wang
Keyword(s):  
Low Voltage ◽  
Power Line ◽  
Power Line Communication ◽  
Channel Code ◽  
Carrier Wave ◽  
Wave Modulation ◽  
Modulation And Demodulation ◽  
Error Ratio ◽  
Power Line Carrier ◽  
Bit Error Ratio

The design on the system of low-voltage power line carrier-current communication based on OFDM was finished in this paper. Then model of the system was simulated and the modulation and demodulation of OFDM were realized. The results show that the integral performance can be enhanced with channel code. And the bit error ratio (BER) of the system is different with several sub-carrier wave modulation modes. This system could satisfy the requirement of power line communication basically.

Frequency modulation and demodulation of a 10.6‐μm CO2laser

1980 ◽  
Vol 36 (1) ◽  
pp. 29-30
Author(s):  
Y. Yasuoka ◽  
T. Takahashi ◽  
T. K. Gustafson
Keyword(s):  
Frequency Modulation ◽  
Modulation And Demodulation

Design and Implementation of Digital Communication Platform Based on FPGA/DSP

2014 ◽  
Vol 981 ◽  
pp. 398-401
Author(s):  
Sheng Guo Zhou ◽  
Wen Jing Shang ◽  
Nan Wang ◽  
Victor Rublev
Keyword(s):  
Digital Communication ◽  
Software Radio ◽  
Modulation Method ◽  
Signal Process ◽  
Communication Platform ◽  
Modulation And Demodulation ◽  
Design And Implementation ◽  
Hardware System ◽  
Radio Method

A method to design and implement digital communication platform was in introduced in this paper. The platform based on software radio method can change modulation method conveniently without the change of hardware system because it used FPGA and DSP to do modulation and signal process. The QPSK modulation and demodulation was implemented in the platform to test this platform.

scholarly journals Investigation and Suppression of RF Leakage Power in Front End Wireless Devices

2021 ◽  
Author(s):  
Kanchana Devi A ◽  
Bhuvaneswari B
Keyword(s):  
Orthogonal Frequency Division Multiplexing ◽  
Frequency Division ◽  
Ofdm Systems ◽  
Wireless Devices ◽  
Modulation And Demodulation ◽  
Front End ◽  
High Spectral Efficiency ◽  
Power Leakage ◽  
System Frequency ◽  
Isolation Performance

In this modern Communication Wireless System, Frequency Division Duplex (FDD) is mostly used. Duplex is a device to separate Transmitter and Receiver signals. Transmitter or Power leakage causes from limited isolation performance of the duplexer. Various Techniques of Modulation using Orthogonal Frequency Division Multiplexing (OFDM) provided better solution to cancel this leakage. The OFDM provides high spectral efficiency, lower multi-path distortion and to eliminate inter symbol interference (ISI). Fast Fourier Transform implemented modulation and demodulation functions more efficiently. Using simulation result of the various parameters are analysed. In addition, Comparison of the table between Bit rate error value, Signal strength throughput, Power consumption and Mean square error values obtained in the OFDM systems.

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