Zobrazeno 1 - 10
of 88
pro vyhledávání: '"Marwa Chafii"'
Publikováno v:
IEEE Access, Vol 12, Pp 24949-25017 (2024)
The Long Range protocol, commonly referred to as LoRa, is a widely adopted and highly regarded method of utilizing chirp spread spectrum (CSS) techniques at the physical (PHY) layer to facilitate low-power wide-area network (LPWAN) connectivity. By t
Externí odkaz:
https://doaj.org/article/42950d3a28f6478d82882bbe2d8f3f02
Publikováno v:
IEEE Access, Vol 10, Pp 69896-69909 (2022)
Indoor localization techniques based on supervised learning deliver great performance accuracy while maintaining low online complexity. However, such systems require massive amounts of data for offline training, which necessitates costly measurements
Externí odkaz:
https://doaj.org/article/8ccf2fed0eaf4fc289bdf7baef9ad5f5
Publikováno v:
IEEE Open Journal of the Communications Society, Vol 3, Pp 718-728 (2022)
Long Range (LoRa) has become a key enabler technology for low power wide area networks. However, due to its ALOHA-based medium access scheme, LoRa has to cope with collisions that limit the capacity and network scalability. Collisions between randoml
Externí odkaz:
https://doaj.org/article/46dc0f42dc9f49c89974787b05a29109
Autor:
Abdul Karim Gizzini, Marwa Chafii
Publikováno v:
IEEE Access, Vol 10, Pp 70595-70619 (2022)
Wireless communications systems are impacted by multi-path fading and Doppler shift in dynamic environments, where the channel becomes doubly-dispersive and its estimation becomes an arduous task. Only a few pilots are used for channel estimation in
Externí odkaz:
https://doaj.org/article/c8ebdca558ca4435b22e7b7a717af886
Autor:
Abdul Karim Gizzini, Marwa Chafii
Publikováno v:
IEEE Access, Vol 10, Pp 34321-34339 (2022)
Wireless communications play a significant role in facilitating several mobile applications like unmanned aerial vehicles, high-speed railway, and vehicular communications. Particularly, the concept of connected vehicles brings a new level of connect
Externí odkaz:
https://doaj.org/article/4b9a7dc7e37248fd8e3467c42d377a19
Publikováno v:
IEEE Access, Vol 9, Pp 69426-69438 (2021)
Automatic signal recognition (ASR) plays an important role in various applications such as dynamic spectrum access and cognitive radio, hence it will be a key enabler for beyond 5G communications. Recently, many research works have been exploring dee
Externí odkaz:
https://doaj.org/article/29793d07e38d4be8a17ddc80213c698f
Publikováno v:
IEEE Access, Vol 9, Pp 98337-98347 (2021)
Several location-based services require accurate location information in indoor environments. Recently, it has been shown that deep neural network (DNN) based received signal strength indicator (RSSI) fingerprints achieve high localization performanc
Externí odkaz:
https://doaj.org/article/717c9e6833bb4b31b9a74ddc68b26ea5
Publikováno v:
IEEE Access, Vol 9, Pp 122397-122411 (2021)
Nowadays, the development of efficient communication system is necessary for future networks. Compressive sensing was proposed as a technique to save storage and energy by compressing signals using simple linear transformations. Although compressed s
Externí odkaz:
https://doaj.org/article/9c205c5f21e94ee597966bcb8da66476
Publikováno v:
IEEE Access, Vol 8, Pp 175741-175752 (2020)
In this paper, we study the problem of euclidean distance matrix (EDM) recovery aiming to tackle the problem of received signal strength indicator sparsity and fluctuations in indoor environments for localization purposes. This problem is addressed u
Externí odkaz:
https://doaj.org/article/78848225d66944b7a2759eaab1eb2ca3
Publikováno v:
IEEE Access, Vol 8, Pp 128646-128664 (2020)
In this article, we introduce intensity modulation and direct detection compatible enhanced optical-orthogonal frequency division multiplexing with index modulation (EO-OFDM-IM) schemes. These approaches augment the spectral efficiency (SE) relative
Externí odkaz:
https://doaj.org/article/b8211429b3124b7abf0cf75ed9b78fb0