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.

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 The Sandblaster Software-Defined Radio Platform for Mobile 4G Wireless Communications

2009 ◽  
Vol 2009 ◽  
pp. 1-9 ◽  
Author(s):  
V. Surducan ◽  
M. Moudgill ◽  
G. Nacer ◽  
E. Surducan ◽  
P. Balzola ◽  
...  
Keyword(s):  
Wireless Communication ◽  
Digital Signal Processor ◽  
Software Defined Radio ◽  
Digital Signal ◽  
Radio Link ◽  
Tier 2 ◽  
Computational Performance ◽  
4G Wireless ◽  
Performance Results ◽  
Conclusion Section

We present a tier 2 Software Defined-Radio platform (SDR), built around the latest Sandbridge Technologies' multithreaded Digital Signal Processor (DSP) SB3500, along with the description of major design steps taken to ensure the best radio link and computational performance. This SDR platform is capable of executing 4G wireless communication standards such as WiMAX Wave 2, WLAN 802.11 g, and LTE. Performance results for WiMAX are presented in the conclusion section.

scholarly journals Performance Analysis of Subcarrier Multiplexed Optical Transmission System for QPSK Data

2020 ◽  
Vol 9 (2) ◽  
pp. 466-476
Keyword(s):  
Optical Transmission ◽  
Dispersion Compensation ◽  
Chromatic Dispersion ◽  
Transmission System ◽  
Laser Source ◽  
Radio Link ◽  
Link Distance ◽  
Performance Results ◽  
The Impact ◽  
Dispersion And Attenuation

This paper focuses on the impact of different parameters on the performance of the Subcarrier Multiplexed Optical Transmission System for the application on radio link via optical fiber. Performance results are evaluated for QPSK data format for ODSB and OSSB modulation of Microwave subcarriers with digital NRZ coded random data patterns. The four subsystems of QPSK modulators are at 400, 500, 600, 700 MHz subcarrier frequencies with frequency spacing of 100 MHz. The power of subcarriers is decreasing with increasing the link distance due to dispersion and attenuation. By using dispersion compensation fiber, the link distance has been enhanced from 100 km to 240 km successfully. The impact of chromatic dispersion has been reduced in OSSB by using dual-electrode MZM. The constellation diagram also confirms that the phase of the signal after traveling through the link is changing due to dispersion. The phase is the same for subcarrier 600 MHz & 700 MHz for ODSB and OSSB in QPSK SCM. The impact of linewidth and responsivity on SNR has also analyzed to evaluate the performance. It is concluded that the maximum SNR is decreasing with increase in the linewidth of laser source and increasing with the increase in responsivity of PIN diode for the same fiber length in SCM transmission.

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