Design consideration of a 77-channel 64-QAM signal transmission system using a light-injected MQW-SOA as an in-line amplifier

1998 ◽  
Author(s):  
SohnLing Tzeng ◽  
Chien Tai ◽  
Hung-Chun Chang
Keyword(s):  
Signal Transmission ◽  
Transmission System ◽  
Design Consideration

scholarly journals Research and Analysis of Digital Baseband Transmission System Based on MATLAB

2018 ◽  
Vol 1 (1) ◽  
Author(s):  
Chai Jianwen
Keyword(s):  
Signal Transmission ◽  
Digital Signal ◽  
Transmission System ◽  
Simulation Software ◽  
Line Pattern ◽  
Matlab Simulation ◽  
Simulation Process ◽  
Transmission Process ◽  
Baseband Signal ◽  
Digital Baseband

This paper mainly studies the basic concept of baseband transmission of digital signal and the transmission processof digital signal baseband transmission and how to design digital baseband transmission system with MATLABsoftware simulation. This paper fi rst introduces the theoretical basis of this subject, including digital communication,the composition of digital baseband transmission system and digital baseband signal transmission process. Then thepaper introduced the characteristics of digital baseband transmission system, including digital PAM signal powerdensity and common line pattern, and by comparing choosing the fi nal bipolar zero return code. Then we introducedthe MATLAB simulation software. The conditions of the best reception of the digital baseband signal are describedand how the waveform of the baseband signal is observed by an oscilloscope. Finally, according to the basic stepsof simulation process, the simulation process of digital baseband transmission system is realized by MATLABsimulation tool, and the system is analyzed.

Design and Implementation of OFDM Baseband Transmission System Based on CORDIC Algorithm and Pipeline FFT

2012 ◽  
Vol 190-191 ◽  
pp. 962-967
Author(s):  
Jun Yang ◽  
Hong Wei Ding ◽  
Ga Zhao ◽  
Ping Ping Shu
Keyword(s):  
High Speed ◽  
Transmission Rate ◽  
Adaptive Modulation ◽  
Signal Transmission ◽  
Transmission System ◽  
Cordic Algorithm ◽  
Clock Frequency ◽  
Modulation Mode ◽  
Baseband Signal ◽  
High Flexibility

This paper designed an OFDM baseband signal transmission system, which adopted CORDIC algorithm, pipeline organization and high-speed floating-point butterfly unit to complete the customized FFT Processor, and the modulation of the signal was realized by enhancing modulation mode (64-QAM) in the adaptive modulation mode. Meanwhile, due to FPGA technology is reconfigurable and parallel, the signal has a higher transmission rate. The system used FPGA resources reasonably and integrated highly, simplifying the complexity of the system; eventually it was adapted to the EP2C35F672C6 chip of Altera, and can be normally operated in the clock frequency of 100 MHz; At the same time, this system the system has high flexibility and generality, simple structure, and good clutter suppression, so it has a certain application prospects.

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