Results 31 to 40 of about 16,098 (206)
Research of MIMO-OFDM Model [PDF]
Advances in Intelligent Systems Research, 2015 OFDM (Orthogonal Frequency Division Multiplex) technique is one of the promising trends of the new generation wireless telecommunication. It can be combined with MIMO (Multiple Input Multiple Output) technique. The MIMO-OFDM system can improve the performance and the capacity of the wireless telecommunication, suppress co-channel interference and ...
Yaochun Li +4 more
openaire +1 more source
Channel Acquisition for Massive MIMO-OFDM with Adjustable Phase Shift Pilots [PDF]
, 2015 We propose adjustable phase shift pilots (APSPs) for channel acquisition in wideband massive multiple-input multiple-output (MIMO) systems employing orthogonal frequency division multiplexing (OFDM) to reduce the pilot overhead.
Gao, Xiqi +3 more
core +2 more sources
Performance Comparison of DWT Based MIMO OFDM and FFT Based MIMO OFDM
Procedia Computer Science, 2015 AbstractMultiple Input Multiple Output (MIMO) and Orthogonal Frequency Division Multiplexing (OFDM) are two combined technologies to provide the spectral efficiency and high data rate required for 4G wireless systems. Discrete Wavelet Transform (DWT) is presented as an alternative for the Fast Fourier Transform FFT since there is no necessity for ...
Bouhlel, Asma +2 more
openaire +1 more source
Synchronization in MIMO OFDM systems [PDF]
Advances in Radio Science, 2005 Abstract. In this paper, an overview of carrier frequency offset (CFO) estimation algorithms for Orthogonal Frequency Division Multiplexing (OFDM) systems is presented. It is well-known that multicarrier systems suffer from their high sensitivity to mismatches of transmitter and receiver oscillator frequencies.
Häring, Lars, Czylwik, Andreas
openaire +2 more sources
Joint Decision-Directed Channel and Noise-Variance Estimation for MIMO OFDM/SDMA Systems Based on Expectation-Conditional Maximization [PDF]
, 2011 A joint channel impulse response (CIR) and noise-variance estimation scheme is proposed for multiuser multiple-input–multiple-output (MIMO) orthogonal frequency-division multiplexing/space-division multiple access (OFDM/SDMA) systems, which is based on ...
Hanzo, Lajos +2 more
core +1 more source
OFDM-OAM Modulation for Future Wireless Communications
IEEE Access, 2019 Orbital angular momentum (OAM) has attracted considerable attention as a novel solution for wireless communications because its orthogonal modes significantly increase the channel capacity without an additional frequency band.
Tao Hu +4 more
doaj +1 more source
Journal of Communications and Networks, 2007 In the last decade, we have witnessed revitalization of multi-carrier techniques, and in particular orthogonal frequency division multiplexing (OFDM) for wireless applications. For wireless applications, an OFDM air-interface is of interest, because it can turn a wideband frequency selective channel into narrowband frequency flat channels.
Vahid Tarokh +3 more
openaire +1 more source
A software and hardware evaluation of revolutionary turbo MIMO OFDM schemes for 5 GHz WLANs [PDF]
, 2003 Globally, WLANs operating in the 5 GHz band have been standardized by the IEEE (North America), ETSI (Europe) and ARID (Japan). A harmonized physical layer is specified offering up to 54 Mbits/s using rate adaptive coded orthogonal frequency division ...
Abdul Aziz, MK +6 more
core +2 more sources
IEEE Photonics Journal, 2021 This paper proposes a novel non-Hermitian symmetry ${2 \times 2}$ MIMO-OFDM (Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing) system based on fast Hartley transform (FHT) with unipolar encoding (referred to as HU-OFDM) for ...
Xian-Ying Xu, Dian-Wu Yue
doaj +1 more source
PAR-Aware Large-Scale Multi-User MIMO-OFDM Downlink [PDF]
, 2012 We investigate an orthogonal frequency-division multiplexing (OFDM)-based downlink transmission scheme for large-scale multi-user (MU) multiple-input multiple-output (MIMO) wireless systems.
Larsson, Erik G., Studer, Christoph
core +1 more source