Results 1 to 10 of about 29,857,416 (243)
Indoor Carrier Phase Positioning Technology Based on OFDM System [PDF]
Sensors, 2021 Carrier phase measurement is a ranging technique that uses the receiver to determine the phase difference between the received signal and the transmitted signal. Carrier phase ranging has a high resolution; thus, it is an important research direction for
Zhenyu Zhang, Shaoli Kang, Xiang Zhang
doaj +4 more sources
Fast carrier recovery in FHSS systems with DDS based Costas loop [PDF]
Electronics, 2015 Owing to fast change of carrier frequency, the usage of coherent demodulation methods in Frequency-Hopping Spread Spectrum (FHSS) communication systems is limited by the coherent state acquisition performed by the local oscillator.
Slavko Šajić
doaj +1 more source
Carrier mobility does matter for enhancing thermoelectric performance
APL Materials, 2020 Excellent thermoelectric materials need both high carrier transport properties and low phonon transport properties simultaneously, which make it challenging to enhance thermoelectric performance. However, recent progress shows that sub-nanostructures can
Yongxin Qin, Yu Xiao, Li-Dong Zhao
doaj +1 more source
Improved MBOC modulations based on periodic offset subcarrier
IET Communications, 2021 With the development of global navigation satellite systems, the modernization of global navigation satellite systems has arrived, which takes the binary offset carrier modulation and related evolution as the typical feature. Moreover, the performance of
Xin Zhao +4 more
doaj +1 more source
Photonic-Based RF Transceiver for UWB Multi-Carrier Wireless Systems
Photonics, 2014 In this paper an all-optical system exploitable as the core structure for a photonic-based RF transceiver is presented. The proposed scheme is able to simultaneously perform either up- or down-conversion of multiple frequency Ultra-Wide Band (UWB) RF ...
Filippo Scotti +5 more
doaj +1 more source
Carrier phase recovery of LDPC-coded systems based on the likelihood difference algorithm
EURASIP Journal on Advances in Signal Processing, 2023 The problem of blind phase offset recovery of low density parity-check (LDPC)-coded systems is considered in this paper. We propose a new algorithm of phase offset estimation that involves the computation and maximization of a likelihood difference (LD ...
Rodrigue Imad, Sebastien Houcke
doaj +1 more source
Efficient Constant Modulus Based Carrier Frequency Offset Estimation for CO-OFDM Systems
IEEE Photonics Journal, 2017 This paper proposes a blind carrier frequency offset (CFO) estimation method for coherent optical orthogonal frequency division multiplexing (CO-OFDM) systems, using constant modulus signaling.
Muyiwa B. Balogun +2 more
doaj +1 more source
International Journal of Nanomedicine, 2021 Jie Zhang,1,* Jinghua Jiao,2,* Meng Niu,3,* Xiaotong Gao,4 Guisen Zhang,5 Honghua Yu,6,* Xiaohong Yang,6 Lei Liu6,7 1Department of Ophthalmology, Weifang Eye Hospital, Weifang, 261041, People’s Republic of China; 2Department of ...
Zhang J +7 more
doaj
Giornale Italiano di Endodonzia, 2017 Aim: To assess the 18-month success rate of root canal treatment with two integrated shaping and filling systems on upper central incisors with chronic periapical pathosis.
Daniele Angerame +4 more
doaj +1 more source
Giornale Italiano di Endodonzia, 2016 Aim: To assess preliminarily the success rate of the root canal treatment with two integrated shaping and filling systems of upper central incisors with chronic periapical pathosis.
Daniele Angerame +4 more
doaj +1 more source