A Downlink Non Orthogonal Multiple Access for Chirp Spread Spectrum Communications

Author(s):  
Guillaume FERRE ◽  
Baptiste Laporte-Fauret ◽  
Mohamed Amine BEN TEMIM
Sensors ◽  
2020 ◽  
Vol 20 (5) ◽  
pp. 1527
Author(s):  
Christophe Bernard ◽  
Pierre-Jean Bouvet ◽  
Antony Pottier ◽  
Philippe Forjonel

The objective of this paper is to provide a multiuser transmission technique for underwater acoustic communication in the framework of an Autonomous Underwater Vehicle (AUV) fleet. By using a variant of a Hyperbolically Frequency-Modulated (HFM) signal, we describe a new family of transmission techniques called MultiUser Chirp Spread Spectrum (MU-CSS), which allows a very simple matched-filter-based decoding. These techniques are expected to provide good resilience against multiuser interference while keeping good robustness to Underwater Acoustic (UWA) channel impairments like Doppler shift. Their implementation for the UWA scenario is described, and the performance results over a simulated shallow-water UWA channel are analyzed and compared against conventional Code-Division Multiple Access (CDMA) and Time-Division Multiple Access (TDMA) transmission. Finally, the feasibility and robustness of the proposed methods are verified over the underWater AcousTic channEl Replay benchMARK (Watermark), fed by several channel responses from sounding experiments performed in a lake.


2002 ◽  
Vol 12 (04) ◽  
pp. 847-853 ◽  
Author(s):  
FRANCISCO ARGÜELLO ◽  
MANUEL BUGALLO ◽  
MARGARITA AMOR

Spread spectrum based on chaotic sequences is an alternative to spread spectrum based on pseudo-noise sequences. In this letter we present the application of two multi-user detection methods (parallel and successive interference cancellation schemes) to this type of code division multiple access. We demonstrate that, also for chaotic sequence-based communications, multi-user receivers significantly improve the BER with respect to single-user receivers, and that their use is practically essential with a high number of users.


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