Zobrazeno 1 - 10
of 55
pro vyhledávání: '"Masanori Hamamura"'
Publikováno v:
IEEE Access, Vol 12, Pp 91957-91973 (2024)
Millimeter-wave beamspace massive multiple-input multiple-output system with a lens antenna array can minimize transceiver hardware complexity without compromising performance. However, the number of supported portable user terminals cannot exceed th
Externí odkaz:
https://doaj.org/article/ed67b81d176944b08136af6d3de8994e
Publikováno v:
IEEE Open Journal of the Communications Society, Vol 5, Pp 3021-3037 (2024)
Enhancing Internet of Things (IoT) communications through Reconfigurable Intelligent Surfaces (RIS) necessitates novel approaches that go beyond the conventional deployment of passive elements. This paper introduces an efficient method to enhance IoT
Externí odkaz:
https://doaj.org/article/b97ddf39365e4777a7fbebcc2ff65224
Autor:
Joarder Jafor Sadique, Saifur Rahman Sabuj, Shaikh Enayet Ullah, Sujoy Kumar Joarder, Masanori Hamamura
Publikováno v:
IEEE Access, Vol 10, Pp 34577-34590 (2022)
Unmanned aerial vehicle (UAV)-based communication system design has already attracted substantial interest due to UAV flexibility in deployment, cost effectiveness, and in-built line-of-sight air-to-ground channels. However, there is a persistent iss
Externí odkaz:
https://doaj.org/article/f5bd53c66f7f4fd091d9b9e336f5b4fc
Publikováno v:
Sensors, Vol 22, Iss 19, p 7445 (2022)
The incorporation of user-assisted cooperative relaying into beamspace massive multiple-input multiple-output (mMIMO) non-orthogonal multiple access (NOMA) system can extend the coverage area and improve the spectral and energy efficiency for millime
Externí odkaz:
https://doaj.org/article/fc6befbed45445ed9d2ea78a03c72c72
Autor:
Yingsong Li, Masanori Hamamura
Publikováno v:
The Scientific World Journal, Vol 2014 (2014)
We propose a smooth approximation l0-norm constrained affine projection algorithm (SL0-APA) to improve the convergence speed and the steady-state error of affine projection algorithm (APA) for sparse channel estimation. The proposed algorithm ensures
Externí odkaz:
https://doaj.org/article/dbf963a67b704cf6a375382660f81a09
Autor:
Yingsong Li, Masanori Hamamura
Publikováno v:
The Scientific World Journal, Vol 2014 (2014)
To make use of the sparsity property of broadband multipath wireless communication channels, we mathematically propose an lp-norm-constrained proportionate normalized least-mean-square (LP-PNLMS) sparse channel estimation algorithm. A general lp-norm
Externí odkaz:
https://doaj.org/article/9509e850e7b4492e944c2380e4074ca2
Millimeter-wave (mmWave) beamspace massive multiple-input multiple-output (mMIMO) system with lens antenna array can minimize transceiver hardware complexity without compromising performance. However, the number of supported portable user terminals (
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1060aabb43011424fd90993c5512606b
https://doi.org/10.36227/techrxiv.22724384.v1
https://doi.org/10.36227/techrxiv.22724384.v1
Autor:
Masahiro FUJII, Masanori HAMAMURA
Publikováno v:
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences. :744-744
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f175acfde04900a4fc35a9e5b7d3a995
https://doi.org/10.1587/transfun.2022wbf0001
https://doi.org/10.1587/transfun.2022wbf0001
Publikováno v:
Wireless Personal Communications. 114:1963-1981
Motivated by the current demand for improvements in transmission rate and energy efficiency of random wireless cellular networks, we investigate the theoretical model of random cognitive radio network in Rayleigh-lognormal fading environment. In such
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5f9bde0badfef6924fc3e1e9076ad4c0
https://doi.org/10.1007/s11277-020-07457-1
https://doi.org/10.1007/s11277-020-07457-1
Publikováno v:
Wireless Personal Communications. 115:2671-2693
An important key technology used in the new standard IEEE 802.11ax is a multiple-user multiple-input multiple-output (MU-MIMO) antenna technology. With MU-MIMO technology, a wireless access point (AP) can increase network throughput by simultaneously
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::98c5d58aa8389141f92f027cdb3212f2
https://doi.org/10.1007/s11277-020-07210-8
https://doi.org/10.1007/s11277-020-07210-8