Search Results for author: Akram Shafie

Found 10 papers, 0 papers with code

Orthogonal Delay-Doppler Division Multiplexing Modulation with Tomlinson-Harashima Precoding

no code implementations14 May 2024 Yiyan Ma, Akram Shafie, Jinhong Yuan, Guoyu Ma, Zhangdui Zhong, Bo Ai

Finally, through numerical results, we validate our analysis and then demonstrate that the ODDM system with time domain THP is a promising solution to realize better BER performance over LTV channels compared to orthogonal frequency division multiplexing systems with single-tap equalizer and ODDM systems with maximum ratio combining.

Time-Frequency Localization Characteristics of the Delay-Doppler Plane Orthogonal Pulse

no code implementations13 Nov 2023 Akram Shafie, Jinhong Yuan, Nan Yang, Hai Lin

Furthermore, we determine the TFA for the recently proposed generalized design of the DDOP.

Coexistence of OTFS Modulation With OFDM-based Communication Systems

no code implementations12 Nov 2023 Akram Shafie, Jinhong Yuan, Yuting Fang, Paul Fitzpatrick, Taka Sakurai

We also show that the effective DD domain channel coefficients for OTFS in coexisting systems are influenced by the unequal lengths of the CPs.

Terahertz Communications for Massive Connectivity and Security in 6G and Beyond Era

no code implementations25 Oct 2022 Nan Yang, Akram Shafie

Terahertz (THz) communications (THzCom) has experienced a meteoric rise of interest, due to its benefits for ultra-high data rate transmission in the sixth generation (6G) and beyond era.

Management

An Unsupervised Learning Approach for Spectrum Allocation in Terahertz Communication Systems

no code implementations7 Aug 2022 Akram Shafie, Chunhui Li, Nan Yang, Xiangyun Zhou, Trung Q. Duong

Numerical results demonstrate that comparing to existing approaches, our proposed unsupervised learning-based approach achieves a higher data rate, especially when the molecular absorption coefficient within the spectrum of interest varies in a highly non-linear manner.

Terahertz Communications for 6G and Beyond Wireless Networks: Challenges, Key Advancements, and Opportunities

no code implementations22 Jul 2022 Akram Shafie, Nan Yang, Chong Han, Josep Miquel Jornet, Markku Juntti, Thomas Kurner

The unprecedented increase in wireless data traffic, predicted to occur within the next decade, is motivating academia and industries to look beyond contemporary wireless standards and conceptualize the sixth-generation (6G) wireless networks.

Management

Novel Spectrum Allocation Among Multiple Transmission Windows for Terahertz Communication Systems

no code implementations6 Jul 2022 Akram Shafie, Nan Yang, Chong Han, Josep M. Jornet

We also show that a further data rate gain can be obtained by optimally determining the unused spectra at the edges of TWs, as compared to avoiding using pre-defined spectra at the edges of TWs.

Spectrum Allocation with Adaptive Sub-band Bandwidth for Terahertz Communication Systems

no code implementations10 Nov 2021 Akram Shafie, Nan Yang, Sheeraz Alvi, Chong Han, Salman Durrani, Josep M. Jornet

Aided by numerical results, we show that by enabling and optimizing ASB, significantly higher throughput can be achieved as compared to adopting equal sub-band bandwidth, and this throughput gain is most profound when the power budget constraint is more stringent.

Coverage Analysis for 3D Terahertz Communication Systems

no code implementations20 Apr 2021 Akram Shafie, Nan Yang, Salman Durrani, Xiangyun Zhou, Chong Han, Markku Juntti

We conduct novel coverage probability analysis of downlink transmission in a three-dimensional (3D) terahertz (THz) communication (THzCom) system.

Coverage Analysis for 3D Terahertz Communication Systems with Blockage and Directional Antennas

no code implementations16 Apr 2020 Akram Shafie, Nan Yang, Zhuo Sun, Salman Durrani

We further show that the coverage performance improvement brought by increasing the antenna directivity at APs is higher than that brought by increasing the antenna directivity at UEs.

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