Results 151 to 160 of about 8,556,450 (194)

Average BER performance of rectangular QAM-UWOC over strong oceanic turbulence channels with pointing error

, 2020
We theoretically analyze the average bit error rate (ABER) performance of underwater wireless optical communication (UWOC) systems using rectangular quadrature-amplitude modulation (QAM) over strong oceanic turbulence channels with pointing error.
Yuqing Fu, D. Qi, C. Huang, Yongzhao Du, Lin Zhou   +4 more
semanticscholar   +1 more source

Modeling and optimization of the integrated TDICCD aerial camera pointing error.

Applied Optics, 2020
Aerial cameras are widely used in a number of fields. Various mechanical errors cannot be ignored with the improvement of imaging quality requirements.
Xiaoqin Zhou, Hao Liu, Qiang Liu, Jieqiong Lin   +3 more
semanticscholar   +1 more source

Wireless energy harvesting based asymmetric RF/FSO system with transmit antenna selection and receive diversity over M-distribution channel and non-zero boresight pointing error

, 2020
This paper evaluates the performance of an energy harvesting based asymmetric radio frequency (RF)/ free space optical (FSO) system with transmit antenna selection (TAS) and received diversity techniques.
K. Odeyemi, P. Owolawi
semanticscholar   +1 more source

Error accumulation and error correction in sequential pointing movements

Experimental Brain Research, 1993
Human subjects pointed, without seeing their arm, at visual targets presented in repeated sequences in a frontal plane. Required movement direction could change within the sequence by 0, 45, 90, 135 or 180 degrees. Hand position was recorded contact-free in three dimensions (3D).
O, Bock, K, Arnold
openaire   +2 more sources

Fixed-Point Minimum Error Entropy With Fiducial Points

IEEE Transactions on Signal Processing, 2020
Compared with traditional learning criteria, such as minimum mean square error (MMSE), the minimum error entropy (MEE) criterion has received increasing attention in the domains of nonlinear and non-Gaussian signal processing and machine learning. Since the MEE criterion is shift-invariant, one has to add a bias to achieve zero-mean error over training
Yuqing Xie 0002, Yingsong Li 0001, Yuantao Gu, Jiuwen Cao, Badong Chen   +4 more
openaire   +1 more source

On the Performance of Quantum Key Distribution FSO Systems Under a Generalized Pointing Error Model

IEEE Communications Letters, 2019
In this letter, the performance of a quantum key distribution (QKD) free-space optical (FSO) system is analyzed while taking a generalized pointing error model into account.
Hui Zhao, Mohamed-Slim Alouini
semanticscholar   +1 more source

Modeling and correction for the optical axis pointing error of an airborne electro-optical platform.

Applied Optics, 2019
Optical axis pointing accuracy is an important index of airborne electro-optical (EO) platforms. In this work, we aim to correct the optical axis pointing angle of an airborne EO platform by digital compensation.
Cheng Xu, Wei Han, Dongzhen Wang, Daqing Huang, Pengfei Yuan   +4 more
semanticscholar   +1 more source

Cardioid microphones/hydrophones in a collocated and orthogonal triad-A steerable beamformer with no beam-pointing error.

Journal of the Acoustical Society of America, 2019
Cardioid sensors offer low sidelobes/backlobes compared to figure-8 bi-directional sensors (like velocity-sensors). Three cardioid sensors, in orthogonal orientation and in spatial collocation, have recently been proposed by Wong, Nnonyelu, and Wu [(2018)
Chibuzo Joseph Nnonyelu, K. T. Wong, Y. Wu   +2 more
semanticscholar   +1 more source

Velocity pointing error analysis for symmetric spinning thrusting Cubesat

Advances in Space Research, 2019
To solve the problem of thrust vector misalignment from the Cubesat center of mass during orbital maneuver, spin-stabilized method is applied to eliminate velocity pointing error.
Zhenhua Liang, W. Liao, Xiang Zhang
semanticscholar   +1 more source

Reconstruction of vibration-deformation-induced pointing error via optimized acceleration measurement points for large reflector antennas

Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 2019
As large reflector antennas have a low natural frequency and primarily operate in open air without a radome, factors such as the stochastic wind disturbance and the moving platform obviously increase the vibration-deformation pointing error. Moreover, in
Wei Liang, Jin Huang, Jie Zhang, Xiaodong Tang, Youran Zhang   +4 more
semanticscholar   +1 more source