10×440-Gb/s super-Nyquist-filtered signal transmission over 3000-km fiber and 10 cascaded ROADMs with 100-GHz grid based on single-carrier ETDM 110-GBaud QPSK

2014 ◽  
Author(s):  
Junwen Zhang ◽  
Jianjun Yu ◽  
Ze Dong ◽  
Hung-Chang Chien ◽  
Zhensheng Jia
Keyword(s):  
Signal Transmission ◽  
Single Carrier ◽  
Grid Based

scholarly journals Influence of the radio signals frequency band on their spatial selection in communication channels

2021 ◽  
Vol 279 ◽  
pp. 02002
Author(s):  
Alexander Okorochkov ◽  
Nadezda Dmitrienko
Keyword(s):  
Frequency Band ◽  
Signal To Noise Ratio ◽  
Radio Channel ◽  
Signal Transmission ◽  
Total Field ◽  
Sharp Drop ◽  
Single Carrier ◽  
Channel Bandwidth ◽  
Radio Signals ◽  
Reception Area

This article deals with the dependence of the signal-to-noise ratio (S/N) on the frequency band of a radio channel when transmitting three different radio signals over it based on a mathematical model. Signals are transmitted on a single carrier frequency, in one direction and occupy the entire channel frequency band, which varied from 0 to 30 GHz. A threeelement sparse antenna array (SAA) is used for signal transmission. Each signal is emitted by all three SAA elements with certain phase shifts. In the reception area, such a structure of the total field is formed, at which the maxima of all transmitted signals are spatially spaced. This allows each signal to be received on a separate antenna. Studies have shown that the S/N ratio for different signals depends differently on the channel bandwidth. For a signal emitted by all SAA antennas in phase, the S/N ratio is practically independent of the bandwidth and is about 70 dB. For the two remaining phased signals the S/N ratio varies equally over the entire range of the channel frequency band values and is characterized by a sharp drop from 62 to 8 dB.

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