Search Results for author: Ahmad Nimr

Found 13 papers, 4 papers with code

Waveforms for sub-THz 6G: Design Guidelines

no code implementations15 Jun 2023 Muris Sarajlić, Nuutti Tervo, Aarno Pärssinen, Le Hang Nguyen, Hardy Halbauer, Kilian Roth, Vaidyanathan Kumar, Tommy Svensson, Ahmad Nimr, Stephan Zeitz, Meik Dörpinghaus, Gerhard Fettweis

The projected sub-THz (100 - 300 GHz) part of the upcoming 6G standard will require a careful design of the waveform and choice of slot structure.

Blind Transmitter Localization Using Deep Learning: A Scalability Study

no code implementations6 Jun 2023 Ivo Bizon, Ahmad Nimr, Philipp Schulz, Marwa Chafii, Gerhard P. Fettweis

This work presents an investigation on the scalability of a deep leaning (DL)-based blind transmitter positioning system for addressing the multi transmitter localization (MLT) problem.

Experimental Performance of Blind Position Estimation Using Deep Learning

no code implementations6 Jun 2023 Ivo Bizon, Zhongju Li, Ahmad Nimr, Marwa Chafii, Gerhard P. Fettweis

For obtaining experimental data, we collect power measurements associated with reference positions using a wireless sensor network in an indoor scenario.

Position

Channel Estimation for MIMO Space Time Coded OTFS under Doubly Selective Channels

no code implementations2 Apr 2021 Roberto Bomfin, Marwa Chafii, Ahmad Nimr, Gerhard Fettweis

The OTFS modulation has been recently proposed as a robust technique under time varying channels due to its property of spreading the data symbols over time and frequency.

OFDM with Index Modulation in Orbital Angular Momentum Multiplexed Free Space Optical Links

no code implementations5 Mar 2021 El-Mehdi Amhoud, Marwa Chafii, Ahmad Nimr, Gerhard Fettweis

Communication using orbital angular momentum (OAM) modes has recently received a considerable interest in free space optical (FSO) communications.

Alternative Chirp Spread Spectrum Techniques for LPWANs

no code implementations18 Feb 2021 Ivo Bizon Franco de Almeida, Marwa Chafii, Ahmad Nimr, Gerhard Fettweis

Chirp spread spectrum (CSS) is the modulation technique currently employed by Long-Range (LoRa), which is one of the most prominent Internet of things wireless communications standards.

Adaptive Channel Estimation based on Deep Learning

1 code implementation IEEE 92nd Vehicular Technology Conference (VTC2020-Fall) 2020 Abdul Karim Gizzini, Marwa Chafii, Ahmad Nimr, Gerhard Fettweis

Channel state information is very critical in various applications such as physical layer security, indoor localization, and channel equalization.

Indoor Localization

In-phase and Quadrature Chirp Spread Spectrum for IoT Communications

no code implementations22 Sep 2020 Ivo Bizon Franco de Almeida, Marwa Chafii, Ahmad Nimr, Gerhard Fettweis

In this paper, we propose a scheme that encodes information bits on both in-phase and quadrature components of the chirp signal, and rather employs a coherent detector at the receiver.

Enhancing Least Square Channel Estimation Using Deep Learning

1 code implementation IEEE 91st Vehicular Technology Conference (VTC2020-Spring) 2020 Abdul Karim Gizzini, Marwa Chafii, Ahmad Nimr, Gerhard Fettweis

Least square (LS) channel estimation employed in various communications systems suffers from performance degradation especially in low signal-to-noise ratio (SNR) regions.

Deep Learning Based Channel Estimation Schemes for IEEE 802.11p Standard

1 code implementation IEEE Access 2020 Abdul Karim Gizzini, Marwa Chafii, Ahmad Nimr, Gerhard Fettweis

IEEE 802. 11p standard is specially developed to define vehicular communications requirements and support cooperative intelligent transport systems.

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