Photonic-based analog and digital RF self-interferencecancellation with high spectral efficiency

2021 ◽  
Author(s):  
Taixia Shi ◽  
Moxuan Han ◽  
Yang Chen
Keyword(s):  
Spectral Efficiency ◽  
Digital Rf ◽  
High Spectral Efficiency

Waveforms with High Spectral Efficiency for Terahertz Communications

2021 ◽  
Author(s):  
Mohamed Shehata ◽  
Ke Wang ◽  
Julian Webber ◽  
Masayuki Fujita ◽  
Tadao Nagatsuma ◽  
...  
Keyword(s):  
Spectral Efficiency ◽  
Terahertz Communications ◽  
High Spectral Efficiency

High-Spectral-Efficiency Mode-Multiplexed Transmission Over Graded-Index Multimode Fiber

2018 ◽  
Author(s):  
Roland Ryf ◽  
Nicolas K. Fontaine ◽  
Steffen Wittek ◽  
Karthik Choutagunta ◽  
Mikael Mazur ◽  
...  
Keyword(s):  
Spectral Efficiency ◽  
Multimode Fiber ◽  
Graded Index ◽  
High Spectral Efficiency

scholarly journals Experimental evaluation of a linear angular momentum multiplexed radio link for moving platforms

2021 ◽  
Vol 477 (2254) ◽  
Author(s):  
Ben Allen ◽  
Tim W. C. Brown ◽  
Timothy D. Drysdale
Keyword(s):  
Angular Momentum ◽  
Spectral Efficiency ◽  
Experimental System ◽  
Antenna System ◽  
Radio Link ◽  
Translation Invariance ◽  
Video Streams ◽  
Moving Platforms ◽  
High Spectral Efficiency ◽  
Performance Results

Linear angular momentum multiplexing (LAMM) has recently been proposed for high spectral-efficiency communications between moving platforms, such as between trains and ground infrastructure. We present performance results obtained from a scale experimental system comprising a 2 × 2 antenna system operating at 2.35 GHz. The link transmitted two independent video streams, using RF pre-coding and software-defined radios to modulate and up/down-convert the signals. Linear motion is introduced to demonstrate the translation-invariance of the technique. We interpret the measured data with the aid of an analytical model to show that crosstalk between the two channels is at levels low enough to consistently support the video streams without interruption. Specifically, our results show spectral efficiency is consistently higher when LAMM coding is enabled compared with an uncoded channel.

scholarly journals Spectral Efficiency of FBMC Over OFDM System

2019 ◽  
Vol 9 (2S3) ◽  
pp. 235-237
Keyword(s):  
Spectral Efficiency ◽  
Orthogonal Frequency Division Multiplexing ◽  
Filter Bank ◽  
Average Power ◽  
Primary Objective ◽  
Mobile Environments ◽  
Frequency Division ◽  
Doppler Shifts ◽  
Wireless Broadband ◽  
High Spectral Efficiency

Significant wireless broadband technology used in various cellular standards is Orthogonal Frequency Division Multiplexing (OFDM) which will make use of Multi Carrier Modulated (MCM) systems. Even though OFDM has numerous advantages, it is hard to employ OFDM for complex networks. It is very hard to establish synchronization in mobile environments as it is difficult to predict the Doppler shifts of different users, which results in inter carrier interference (ICI). Further, filters associated with OFDM carrier have comparatively large sidebands which outcomes in Out of Band (OOB) radiations. Insufficient spectral usage is provided by CP-OFDM by using more guard band. So the problems caused by traditional OFDM/CP-OFDM can be answered by employing a new system termed as Filter Bank Multi Carrier (FBMC) System. It is a form of MCM and it can be considered as an advanced cyclic-prefix (CP-OFDM). In OFDM, whole band gets filtered while in FBMC, each sub carrier band is independently filtered. The primary objective of this work is to relate the performance of 5G modulation technique such as FBMC against OFDM and to suggest an ideal waveform for 5G communication in regard to high spectral efficiency, spectral density, BER and less Peak to Average Power Ratio (PAPR).

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