scholarly journals Using optical code-division multiple-access techniques in Michelson interferometer vibration sensor networks

2017 ◽  
Vol 19 (1) ◽  
pp. 343-354
Author(s):  
Chih-Ta Yen ◽  
Jen-Fa Huang ◽  
Guan-Jie Huang
Keyword(s):  
Sensor Networks ◽  
Code Division Multiple Access ◽  
Multiple Access ◽  
Michelson Interferometer ◽  
Vibration Sensor ◽  
Code Division Multiple

scholarly journals Convex optimization–based multi-user detection in underwater acoustic sensor networks

2018 ◽  
Vol 14 (2) ◽  
pp. 155014771875766 ◽  
Author(s):  
Jianping Wang ◽  
Shujing Zhang ◽  
Wei Chen ◽  
Dechuan Kong ◽  
Zhou Yu
Keyword(s):  
Sensor Networks ◽  
Computational Complexity ◽  
Convex Optimization ◽  
Code Division Multiple Access ◽  
Multiple Access ◽  
Acoustic Sensor ◽  
Underwater Acoustic Sensor Networks ◽  
Underwater Acoustic ◽  
Acoustic Sensor Networks ◽  
Code Division Multiple

Multi-carrier code-division multiple access is an important technical means for high-performance underwater acoustic sensor networks. Nevertheless, severe multiple access interference is a huge challenge. As the core technology, multi-user detection is used to eliminate multiple access interference. The traditional optimal detection algorithms (e.g. maximum likelihood) have very high computational complexity, and the performances of suboptimal detection methods (i.e. zero forcing, minimum mean square error, etc.) are poor. Therefore, taking into account the characteristics of underwater acoustic sensor networks, it is of great significance to design multi-user detection algorithms for achieving a tradeoff between the detection performance and the computational complexity in multi-carrier code-division multiple access systems. In this article, we design a transmitter model of underwater multi-carrier code-division multiple access system and then implement a multi-user detection algorithm based on convex optimization, which is named convex optimization–based algorithm. Next, we conduct the detection performance and computational complexity comparisons of maximum likelihood, zero forcing, minimum mean square error, and convex optimization–based algorithm. The results show that the performance of convex optimization–based algorithm is close to that of maximum likelihood, and the complexity is close to that of zero forcing. Therefore, a tradeoff between the computational complexity and the detection performance is realized in convex optimization–based algorithm. It means that convex optimization–based algorithm is suitable for the multi-user detection in multi-carrier code-division multiple access systems of underwater acoustic sensor networks.

Optical Code Division Access Application for Fiber Loop Vibration Sensor

2011 ◽  
Vol 65 ◽  
pp. 324-327
Author(s):  
Hsu Chih Cheng ◽  
Rong Shun Syu
Keyword(s):  
Fiber Bragg Grating ◽  
Code Division Multiple Access ◽  
Multiple Access ◽  
Vibration Signal ◽  
Experimental Results ◽  
Vibration Sensor ◽  
Access Technology ◽  
System Method ◽  
Code Division Multiple ◽  
Fiber Loop

We proposed a fiber loop sensor systems by using optical code division multiple access technology. The encoding/decoding devices use the multiple fiber Bragg grating chains to provide the orthogonal properties in the wavelength domain. Also, the fiber loop sensor used to detect the vibration signal of object under test. The experimental results show that the proposed optical code division access multiple system method is effective.

scholarly journals Author Correction: Subpixel three-dimensional laser imaging with a downscaled avalanche photodiode array using code division multiple access

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Fan Xu ◽  
Yuan-Qing Wang ◽  
Xiao-Fei Zhang ◽  
Cai-Yun Wang
Keyword(s):  
Code Division Multiple Access ◽  
Multiple Access ◽  
Three Dimensional ◽  
Avalanche Photodiode ◽  
Laser Imaging ◽  
Photodiode Array ◽  
Code Division Multiple

A Correction to this paper has been published: https://doi.org/10.1038/s42005-021-00520-8.

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