Comparative analysis of influence of non-linear distortion in power amplifier in wireless communications systems with single and multiple orthogonal carrier frequencies

2010 ◽  
Vol 53 (8) ◽  
pp. 395-404
Author(s):  
A. A. Maltsev ◽  
R. O. Maslennikov ◽  
A. V. Khoryaev ◽  
A. A. Lomayev
Keyword(s):  
Comparative Analysis ◽  
Wireless Communications ◽  
Power Amplifier ◽  
Communications Systems ◽  
Non Linear ◽  
Wireless Communications Systems

On the Time-Varying Non-Linearity Effects Over the Spectrum of MIMO-OFDM Wireless Communications Systems

2018 ◽  
Vol 10 (2) ◽  
pp. 25-39
Author(s):  
Alexander Hilario Tacuri
Keyword(s):  
Wireless Communications ◽  
Volterra Series ◽  
Band Spectrum ◽  
Specific Situation ◽  
Wide Sense ◽  
Time Varying ◽  
Communications Systems ◽  
Non Linear ◽  
Mimo Ofdm ◽  
Wireless Communications Systems

This article presents analytical expressions that can be used in the evaluation of the effects of a non-linear mobile (multi-path) channel on the spectrum of MIMO-OFDM communications systems, such as 4G systems (LTE, WiMax) and probably the future 5G systems. The channel is modeled by a time-varying Volterra Series and the MIMO-OFDM signal by a complex, proper, wide-sense stationary Gaussian random process with zero mean. The resulting mathematical expressions are applied to a specific situation, allowing a quantitative evaluation of the out-band spectrum regrowth of MIMO-OFDM wireless communications systems produced by the use of non-linear devices in mobile channels.

Cognitive Wireless Communications – A paradigm shift in dealing with radio resources as a prerequisite for the wireless network of the future – An overview on the topic of cognitive wireless technologies

Frequenz ◽  
2016 ◽  
Vol 70 (7-8) ◽  
Author(s):  
Thomas Haustein ◽  
Slawomir Stanczak ◽  
Adam Wolisz ◽  
Friedrich Jondral ◽  
Hans Schotten ◽  
...  
Keyword(s):  
Wireless Communications ◽  
Wireless Communication ◽  
Mobile Network ◽  
Radio Spectrum ◽  
Wireless Channel ◽  
Radio Communications ◽  
Communications Systems ◽  
Starting Point ◽  
The Status ◽  
Wireless Communications Systems

AbstractWireless radio communications systems form the basis for mobile network connections in the digital society. A limited amount of radio spectrum and a spatially densified use of wireless communications systems require a resource-efficient use of the spectrum. Mechanisms of cognitive radio may hold the key to a more efficient use of the available spectrum under consideration of quality of service requirements. These mechanisms take advantage of location-specific knowledge of the wireless channel occupation in the dimensions of frequency, time, location and direction in space and therefore enable co-existent and reliable wireless communication. The authors give an introduction to the status of cognitive wireless communication technology, which represents the starting point of a series of research projects promoted by BMBF during 2012–2014.

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