A Zero Padding SVD Encoder to Compress Electrocardiogram

Reducing specific inter-symbol interference of constant envelope OFDM system through optimizing zero-padding pattern

2011 IEEE International Conference on Signal Processing, Communications and Computing (ICSPCC) ◽

10.1109/icspcc.2011.6061665 ◽

2011 ◽

Cited By ~ 1

Author(s):

Zujun Liu ◽

Jieling Wang ◽

Hongxin Tian ◽

Kechu Yi

Keyword(s):

Ofdm System ◽

Zero Padding ◽

Constant Envelope ◽

Inter Symbol Interference

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Optimization of Virtual Shack-Hartmann Wavefront Sensing

Sensors ◽

10.3390/s21144698 ◽

2021 ◽

Vol 21 (14) ◽

pp. 4698

Author(s):

Xian Yue ◽

Yaliang Yang ◽

Fei Xiao ◽

Hao Dai ◽

Chao Geng ◽

...

Keyword(s):

Optimization Methods ◽

Wavefront Sensing ◽

Noise Performance ◽

Zero Padding ◽

Ocular Aberrations ◽

Processing Procedure ◽

Wavefront Error ◽

Before And After ◽

Calculation Algorithms ◽

Normal Human

Virtual Shack–Hartmann wavefront sensing (vSHWS) can flexibly adjust parameters to meet different requirements without changing the system, and it is a promising means for aberration measurement. However, how to optimize its parameters to achieve the best performance is rarely discussed. In this work, the data processing procedure and methods of vSHWS were demonstrated by using a set of normal human ocular aberrations as an example. The shapes (round and square) of a virtual lenslet, the zero-padding of the sub-aperture electric field, sub-aperture number, as well as the sequences (before and after diffraction calculation), algorithms, and interval of data interpolation, were analyzed to find the optimal configuration. The effect of the above optimizations on its anti-noise performance was also studied. The Zernike coefficient errors and the root mean square of the wavefront error between the reconstructed and preset wavefronts were used for performance evaluation. The performance of the optimized vSHWS could be significantly improved compared to that of a non-optimized one, which was also verified with 20 sets of clinical human ocular aberrations. This work makes the vSHWS’s implementation clearer, and the optimization methods and the obtained results are of great significance for its applications.

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