Results 71 to 80 of about 3,213,319 (172)
On the Optimization of Iterative Clipping and Filtering for PAPR Reduction in OFDM Systems
IEEE Access, 2017 Orthogonal frequency division multiplexing (OFDM) offers spectral efficiency advantage, however, it is limited by peak-to-average power (PAPR) problem. The PAPR can be reduced using iterative clipping and filtering (ICF) scheme but requires that the same
Kelvin Anoh +2 more
doaj +1 more source
OFDM Waveform Design for Joint Radar-communication Based on Data Distortion
Leida xuebaoOrthogonal Frequency Division Multiplexing (OFDM) waveform design is one of the key physical layer technologies for achieving joint radar-communication.
Yan LIU, Xianrong WAN, Jianxin YI
doaj +1 more source
Carrier Aggregated Radio-Over-Fiber Downlink for Achieving 2Gbps for 5G Applications
IEEE Access, 2019 We demonstrate experimentally, for the first time, a distributed digital predistortion model for radio-over-fiber (RoF) downlink suitable for broadband 5G signals.
Mahmood Noweir +3 more
doaj +1 more source
Results in EngineeringThis paper presents a novel approach of integrating an error vector magnitude with hierarchical modulation in which HM dynamically adjusts modulation schemes to optimize spectral efficiency under varying channel conditions.
U. Shyamala Devi, R.K. Mugelan
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V-band six-port quadrature demodulator : Error Vector Magnitude analysis
, 2015 International audienceDirect conversion quadrature demodulator analysis based on recently fabricated V-band six-port circuit operating over 60 GHz band is presented in this paper. In order to obtain realistic system simulation results, the computer model
Z. Ouardirhi +7 more
core +1 more source
Dual Polarization Optical Slicing for C-RAN in 5G Networks based on Radio-over-Fiber
Revista UIS IngenieríasThis paper investigates the potential of a dual polarized optical spectral slicing system to enable high-capacity optical links in the Cloud-Radio Access Network (C-RAN) segment based on Radio-over-Fiber (RoF) of a 5G network.
Gustavo Puerto-Leguizamón +1 more
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Parallel PWMs Based Fully Digital Transmitter with Wide Carrier Frequency Range
The Scientific World Journal, 2013 The carrier-frequency (CF) and intermediate-frequency (IF) pulse-width modulators (PWMs) based on delay lines are proposed, where baseband signals are conveyed by both positions and pulse widths or densities of the carrier clock.
Bo Zhou +4 more
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IEEE Photonics Journal, 2014 A system involving W-band (75-110 GHz) optical millimeter (mm)-wave generation using the external optical modulator (EOM) in a radio-over-fiber (RoF) link is presented for satisfying the requirements for multi-gigabit-per-second data rates.
S. E. Alavi +6 more
doaj +1 more source
Adaptive Modulation and Coding Using Neural Network Based SNR Estimation
IEEE Access, 2019 In this paper, we propose a novel Adaptive Modulation and Coding (AMC) scheme enabled by Artificial Neural Network (ANN) aided Signal-to-Noise power Ratio (SNR) estimation. The Power Spectral Density (PSD) values are trained for SNR classification and it
Shun Kojima +2 more
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Low-cost EVM built-in test of RF transceivers
, 2014 International audienceWe present a novel low-cost built-in test approach for the Error Vector Magnitude (EVM) performance of RF transceivers. We rely on built-in sensors to extract low-cost measurements that can be used thereafter to predict implicitly ...
Serhan, A. +7 more
core +1 more source