A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2017; you can also visit the original URL.
The file type is application/pdf.
Filters
MIMO Transmission with Limited Feedback
2008
EURASIP Journal on Advances in Signal Processing
Preserved Fulltext
The feedback consists of channel direction information (CDI) based on a predetermined codebook and a scalar metric with channel quality information (CQI) to perform user scheduling. ...
Particularly, the sum rates of SDMA and time-division multiple access (TDMA) are compared in the extreme regimes: large number of users, high SNR, and low SNR. ...
Particularly, the sum rates of SDMA and time-division multiple access (TDMA) are compared in the extreme regimes: large number of users, high SNR, and low SNR. ...
doi:10.1155/2008/518950
fatcat:okyhyovgdjhdbh7ixmsm6mwid4
An Approach For Real Time Prototyping Of Mimo-Ofdm Systems
2004
Zenodo
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2020; you can also visit the original URL.
The file type is application/pdf.
Publication in the conference proceedings of EUSIPCO, Viena, Austria, 2004 ...
A 2-antenna MIMO-OFDM system with a doubled downlink capacity compared with IEEE.11a standard is prototyped on the platform. An overview of the hardware resources is given. ...
OVERVIEW OF MIMO ALGORITHMS WITH TRANSMITTER PROCESSING The system model is described as an OFDM/SDMA system with A antennas at the base station and U single antenna terminals. ...
doi:10.5281/zenodo.38558
fatcat:levpztfysjfxldhvx37zfrfpuq
Multiple Access Techniques for Next Generation Wireless: Recent Advances and Future Perspectives
2016
EAI Endorsed Transactions on Wireless Spectrum
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2018; you can also visit the original URL.
The file type is application/pdf.
The proposed concept envisions to employ joint antenna coding in order to enhance the orthogonality of SDMA beams with the objective of enhancing the spectral efficiency of future cellular networks. ...
In this context, this paper first provides a detailed review on the existing Space Division Multiple Access (SDMA) related works. ...
enhance the capacity of OFDM-SDMA systems. ...
doi:10.4108/eai.19-1-2016.151002
fatcat:7yxosuz675efvpme6b47bm5idu
Rate-Splitting Multiple Access: Unifying NOMA and SDMA in MISO VLC Channels
[article]
2020
arXiv
pre-print
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2020; you can also visit the original URL.
The file type is application/pdf.
Through system modeling and simulations of an RSMA-based two-use scenario, we illustrate the flexibility of RSMA in generalizing NOMA and SDMA, as well as its superiority in terms of weighted sum rate ...
Despite their promising multiplexing gains, their performance is somewhat limited. In this article, we first provide an overview of the key MA technologies used in VLC systems. ...
Most research effort has focused on the analysis of downlink BC of MU-MIMO, with an emphasis on the data rate performance. ...
arXiv:2007.13560v1
fatcat:j4bhz64ca5dnlj7ew4du4sv2ii
Multiple Access for Visible Light Communications: Research Challenges and Future Trends
[article]
2016
arXiv
pre-print
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2020; you can also visit the original URL.
The file type is application/pdf.
In this context, we initially provide a thorough overview of frequency domain multiple access techniques for single and multi-carrier systems, which is then followed by an in depth discussion on the technical ...
To this end, the present article provides a comprehensive overview of a particularly promising and effective wireless technology, namely, visible light communication (VLC). ...
Based on this, NOMA was thoroughly analyzed in [15] and compared against OFDMA in the context of a VLC downlink scenario with two users. ...
arXiv:1612.05894v1
fatcat:swn7cgozg5e53afvqjhhcksem4
Advances in MIMO Techniques for Mobile Communications—A Survey
2010
International Journal of Communications, Network and System Sciences
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2017; you can also visit the original URL.
The file type is application/pdf.
A detailed review of various MU-MIMO uplink and downlink techniques then follows, clarifying the underlying concepts and emphasizing the importance of MU-MIMO in cellular communication systems. ...
This paper also touches upon the topic of MU-MIMO capacity as well as the promising convex optimization approaches to MIMO system design. where Q is an N M unitary matrix with orthonormal columns, R ...
It specifies an OFDM based system with support for MIMO. Downlink transmission is based on OFDMA while SC-FDMA is used for the uplink due to its low PAPR characteristics. ...
doi:10.4236/ijcns.2010.33031
fatcat:wyhhqdwt5nablim2rvqij2osju
A Survey of NOMA for VLC Systems: Research Challenges and Future Trends
2022
Sensors
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2022; you can also visit the original URL.
The file type is application/pdf.
The power domain nonorthogonal multiple access (PD-NOMA) scheme is envisioned to address several challenges in VLC systems. In this paper, we present a detailed overview of PD-NOMA based VLC systems. ...
Moreover, we introduce insights on some PD-NOMA VLC system constraints and challenges such as power allocation, clipping effect, MIMO and security. ...
Block diagram of a two-user downlink DCO-OFDM-based PD-NOMA-VLC system.
Figure 11 . 11 Figure 11. Block diagram of 2 × 2 MIMO-PD-NOMA-based VLC system with N users. ...
doi:10.3390/s22041395
pmid:35214296
pmcid:PMC8962994
fatcat:qhjvxjkt2jcptm7cfsyot6wk6u
Optical Rate-Splitting Multiple Access for Visible Light Communications
[article]
2020
arXiv
pre-print
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2020; you can also visit the original URL.
The file type is application/pdf.
Other Versions
We first provide an overview of the key multiple access technologies used in VLC systems. Then, we propose the first comprehensive approach to the integration of RSMA with VLC systems. ...
In spite of their promising gains, the performance of these techniques is somewhat limited. ...
Most research focused on the analysis of the downlink BC of MU-MIMO, with an emphasis on the data rate performance. ...
arXiv:2002.07583v2
fatcat:hlfxktsvbjag7mi2jyzeqlmbtu
Evolution from TD-SCDMA to FuTURE
[chapter]
2009
Internet and Communications
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2012; you can also visit the original URL.
The file type is application/pdf.
Furthermore, DCA can be combined with a smart antenna and GDAA so as to improve the system performance using SDMA. ...
Therefore, an efficient frequency reuse strategy, as well as enhancing performance for the cell-edge users, is still left as an open research issue for those FDMA-based systems. ...
doi:10.1201/9781420072112.ch2
fatcat:xnhslgf2qfhe5gadpbmzzyc45u
Multiuser MIMO-OFDM for Next-Generation Wireless Systems
2007
Proceedings of the IEEE
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2017; you can also visit the original URL.
The file type is application/pdf.
for MIMO-OFDM systems and characterizes their achievable performance. ...
The amelioration of powerful multicarrier OFDM arrangements with multiple-input multiple-output (MIMO) systems has numerous benefits, which are detailed in this treatise. ...
Enhanced GA MUDs In order to further improve the achievable performance of MIMO SDMA-OFDM systems, the enhanced GA-based MUDs of [281] , [282] can be employed, which improve the detector's performance ...
doi:10.1109/jproc.2007.898869
fatcat:mzfhdw6hyzbvrgraoly4mdpapq
Joint Power Allocation and Scheduling of Multi-Antenna OFDM System in Broadcast Channel
2009
2009 IEEE International Conference on Communications
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2017; you can also visit the original URL.
The file type is application/pdf.
We present joint user selection algorithms for DPC, ZF-DPC, ZFBF and TDMA for multi-antenna OFDM system in broadcast channels, and we also present a practical waterfilling solution in this paper. ...
This paper considers the general multiuser downlink scheduling problem and power minimization with multiuser rate constraints. ...
In multiuser MIMO-OFDM system, we consider a wireless communication system with one base station and K users. The base station is with N t In an OFDM symbol, the number of total subcarrier is N c . ...
doi:10.1109/icc.2009.5199118
dblp:conf/icc/SheCLHW09
fatcat:eqynk4sdczekde5msiwtcyue6q
Impact of the Transmission Scheme on the Performance in Wireless LANs
[chapter]
2009
Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2020; you can also visit the original URL.
The file type is application/pdf.
For MIMO-TDMA and -OFDMA, channel knowledge at the PHY layer does not result in essential performance enhancement. ...
MISO-SDMA has a relatively small performance penalty in comparison to MIMO-SDMA which gives the best result. ...
An OFDM transmission system is used with N M = 32 subcarriers working at a carrier frequency f C of 5.2 GHz with a channel bandwidth of 40 MHz. ...
doi:10.1007/978-3-642-03819-8_29
fatcat:xpg6lfufyvcezeisq2tz7s6r6e
Multi-User Visible Light Communications: State-of-the-Art and Future Directions
2018
IEEE Access
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2020; you can also visit the original URL.
The file type is application/pdf.
Other Versions
While initial studies in this area are mainly limited to single-user point-to-point links, more recent efforts have focused on multi-user VLC systems in an effort to transform VLC into a scalable and fully ...
In this paper, we provide a comprehensive overview of multi-user VLC systems discussing the recent advances on multi-user precoding, multiple access, resource allocation, and mobility management. ...
[82] proposed an adaptive OFDM VLC system which allows MIMO mode switching based on channel conditions. ...
doi:10.1109/access.2018.2879885
fatcat:y7ltnuy4yjfzzggeaolnasttz4
Towards 5th generation cellular mobile networks
2014
Australian Journal of Telecommunications and the Digital Economy
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2018; you can also visit the original URL.
The file type is application/pdf.
dense small cells, and provide an indepth discussion on potential enabling techniques for the next generation (5G) cellular networks, particularly massive MIMO and multiband base-station antennas. ...
In this article, we show the path of the evolution in both standards and techniques, and provide our vision for the future of the cellular networks. ...
Based on the law of large numbers, the deterministic channel makes frequency domain scheduling unnecessary. Each subcarrier in a massive MIMO-OFDM system will approach the same channel gain. ...
doi:10.7790/ajtde.v2n2.34
fatcat:43ixpaqptzdybafodcglgnakwq
Rate-Splitting Multiple Access: Unifying NOMA and SDMA in MISO VLC Channels
2020
IEEE Open Journal of Vehicular Technology
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2020; you can also visit the original URL.
The file type is application/pdf.
However, despite their achievable multiplexing gain, their overall performance is still limited compared to the overall potential of this technology. ...
Secondly, through realistic system modeling and simulations of an RSMA-based two-user scenario, we illustrate the flexibility of RSMA as well as its superiority in terms of the achievable weighted sum ...
In particular, research results have shown that RSMA in MIMO-based RF systems outperforms other common MA schemes, such as NOMA and SDMA, in terms of both spectral and energy efficiency [24] . ...
doi:10.1109/ojvt.2020.3031656
fatcat:2eu67wbpgrdsdpdcehppv6zr6e
« Previous
Showing results 1 — 15 out of 161 results