Results 21 to 30 of about 34,306 (214)
Sensors, 2023 This paper investigates the degradation caused by interference resulting from cyclic prefix violation and symbol timing offset in narrowband power line communication systems. In this sense, it presents a unified formulation from which Hermitian symmetric
Túlio Fernandes Moreira +3 more
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Data-derived iterative channel estimation with channel tracking for a mobile fourth generation wide area OFDM system [PDF]
, 2003 In this paper an iterative channel estimation technique for a mobile fourth generation coherent orthogonal frequency division multiplexing (OFDM) system is proposed. Coherent detection dictates that a per-subband estimate of the frequency response of the
Dowler, ASH, McGeehan, JP, Nix, AR
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Super-Orthogonal Block Codes with Multichannel Equalisation and OFDM in Frequency Selective Fading
EURASIP Journal on Wireless Communications and Networking, 2010 Super-orthogonal block codes in space-time domain (i.e., Super-orthogonal space-time trellis codes (SOSTTCs)) were initially designed for frequency nonselective (FNS) channels but in frequency selective (FS) channels these super-orthogonal block codes ...
O. Sokoya, B. T. Maharaj
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Universal Filtered Multicarrier (UFMC) vs. Orthogonal Frequency Division Multiplexing (OFDM)
Journal of Physics: Conference Series, 2020 Abstract Wireless systems can be utilized in various areas. These wireless systems require a flexible mechanism for the allocation of the available time and frequency resources. The framework time-recurrence designation is very troublesome in the regular OFDM frameworks. The multicarrier procedure has been a dumbfounding technique in the
Saadaldeen Rashid Ahmed +2 more
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Adaptive spatial mode of space-time and spacefrequency OFDM system over fading channels [PDF]
, 2006 In this paper we present a 2 transmit 1 receive (1 Tx : 1 Rx) adaptive spatial mode (ASM) of space-time (ST) and space-frequency (SF) orthogonal frequency division multiplexing (OFDM). At low signal to noise ratio (SNR) we employ ST-OFDM and switch to
A. Rahman, Tharek +4 more
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Duality of antennas and subcarriers in massive MIMO-OFDM downlink system [PDF]
, 2015 Massive multiple-input-multiple-output (MIMO) can significantly outperform conventional MIMO in terms of spectrum efficiency and link reliability. For massive MIMO, there are still theoretical and practical issues that have to be addressed.
Bannour, Ahmed, Sun, Yichuang
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Photonics, 2022 Orbital angular momentum (OAM) with mutually orthogonal advantage attribute to break through the high capacity and long-reach transmission limited in the classical passive optical network (PON). Employing Laguerre Gaussian (LG) mode as the orthogonal OAM
Qingan Ding +8 more
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Sensors, 2018 Non-orthogonal multiple access (NOMA) systems are being considered as candidates for 5G wireless systems due to their promise of improved spectral efficiency.
Jayanta Datta, Hsin-Piao Lin
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Robust time synchronization for NC-OFDM cognitive radio systems
Journal of King Saud University: Computer and Information Sciences, 2022 In this paper, we propose a time-synchronization method for non-contiguous orthogonal frequency division multiplexing (NC-OFDM) systems. NC-OFDM is a modulation and multiplexing technique that is often used for cognitive radio (CR) systems. In OFDM-based
Suyoto Suyoto +3 more
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Principles，technologies and challenges of OQAM-OFDM for 5G applications
Dianxin kexue, 2016 5G will need to be able to support much larger connections of communication devices and meet the requirements of diverse scenarios.However，this requirement cannot be met by OFDM（orthogonal frequency division multiplexing）due to its own drawbacks.As an ...
Jun LI +4 more
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