Results 141 to 150 of about 15,137 (178)
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Greedy Scheduling of MIMO OFDMA: TDMA, FDMA/TDMA, or SDMA/FDMA/TDMA
IEEE Vehicular Technology Conference, 2006In multiuser MIMO system, multiuser multiplexing and diversity gain can be achieved by spatial scheduling. However, the limited battery life and terminal size of the User Equipment (UE) in a cellular system put a constraint on MIMO when the tranmitter has more antenna than the receiver in downlink, the conventional MIMO schemes can only exploit partial
Jianhua Zhang, Guangyi Liu, Ping Zhang
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Multiple Access of MIMO OFDMA: TDMA, FDMA/TDMA, or SDMA/FDMA/TDMA
2006 International Conference on Communications, Circuits and Systems, 2006Multiple input and multiple output (MIMO) can greatly enhance the performance of wireless system. However, the limited battery life and terminal size of the user equipment (UE) in a cellular system put a constraint on the performance enhancement by MIMO.
Guangyi Liu +5 more
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Design of multibeam satellite networks realized by subchannel switched FDMA (SS/FDMA) system
Electronics and Communications in Japan (Part I: Communications), 1994AbstractThis paper aims at improvement of the interbeam connectivity of the multibeam satellite for fixed satellite communications under frequency division multiple access (FDMA) operation and proposes the subchannel switched FDMA (SS/FDMA) system, which is realized by installing the filter matrix on‐board the satellite.
Hideyuki Shinonaga, Yasuhiko Ito
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SC-FDMA based Secure Data Transfer
2021 International Conference on Computer Communication and Informatics (ICCCI), 2021In today's world of science exchange of information in a secure manner is complex due to data breaching. This happens mainly in hospitals, banks and military. Data breach leads to very severe consequences. The data's security level should be high. In this manuscript cryptography and steganography is used to secure secret text.
S. Jayakokela +3 more
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Non‐regenerative satellite switched FDMA (SS/FDMA) payload technologies
International Journal of Satellite Communications, 1987AbstractSatellite switched frequency division multiple access (SS/FDMA) satellite systems are new adaptations of the basic FDMA architecture for multiple beam spacecraft. Present multibeam satellite systems feature on‐board interbeam connections operating on a transponder channel basis, e.g. 72 MHz.
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Spectrally-efficient FDMA-CPM systems
2014 IEEE International Conference on Communications (ICC), 2014This paper concerns with the design of spectrally-efficient Frequency-Division-Multiple-Access (FDMA) multiuser systems based on Continuous-Phase-Modulation (CPM). A class of FDMA-CPM is proposed to accommodate multiple users in a subchannel and therefore admits significantly improved spectral-efficiency.
Li Bing, Tor Aulin, Baoming Bai
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International Journal of Satellite Communications, 1992
AbstractThis paper analyses and compares possible access schemes to be used in satellite networks with a large number of small earth‐stations. Basically, frequency division (FDMA), time division (TDMA), and spread spectrum multiple access (SSMA) are considered.
José Paulo A. Albuquerque +1 more
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AbstractThis paper analyses and compares possible access schemes to be used in satellite networks with a large number of small earth‐stations. Basically, frequency division (FDMA), time division (TDMA), and spread spectrum multiple access (SSMA) are considered.
José Paulo A. Albuquerque +1 more
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An OFDM/FDMA Indoor Geolocation System
Navigation, 2004: An orthogonal frequency division multiplexing (OFDM) frequency division multiple access (FDMA) indoor geolocation system is discussed in this paper. The principle of operation, transmitter, channel, and receiver are discussed. The system's theoretical performance and simulation results are presented.
ILIR F. PROGRI +2 more
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Localized SC-FDMA with constant envelope
2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC), 2013Singe-carrier frequency-division multiple access (SC-FDMA) enables simplified equalization and flexible multiuser scheduling in the frequency domain. Compared to orthogonal frequency division multiple access (OFDMA), it has reduced envelope fluctuations in the same bandwidth.
Jungnickel V., Grobe L.
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Reconfigurable FDMA satellite on-board processing
MILCOM 2002. Proceedings, 2003Most commercial satellite systems today are based on multiple beam FDMA formats, in which uplink users are assigned frequency subbands filtered off by present front end bandpass filters, and circuit switched to form the downlink FDMA beams. It would be advantageous to have a reconfigurable version of this front end processor that would permit changes ...
G. Clayton, R. Gagliardi
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