A New Construction Method of Zero-Correlation Zone Sequences Based on Complete Complementary Codes

2008 ◽  
Vol E91-A (12) ◽  
pp. 3698-3702 ◽  
Author(s):  
C. HAN ◽  
T. HASHIMOTO ◽  
N. SUEHIRO
Keyword(s):  
Construction Method ◽  
Zero Correlation ◽  
New Construction ◽  
Zero Correlation Zone

A New Construction of Optical Zero-Correlation Zone Codes

2018 ◽  
Vol 39 (3) ◽  
pp. 359-368 ◽  
Author(s):  
Benattou Fassi ◽  
Abdelmalik Taleb-Ahmed
Keyword(s):  
Code Division Multiple Access ◽  
Multiple Access ◽  
Hadamard Matrix ◽  
Access System ◽  
Zero Correlation ◽  
Channel Interference ◽  
New Construction ◽  
Zero Correlation Zone ◽  
Code Division Multiple ◽  
Multiple Access System

Abstract A new method for constructing optical zero-correlation zone (OZCZ) codes based on the Hadamard matrix and the concatenation operation is proposed. The most important property of the obtained codes is that the periodic correlation function of the proposed codes is zero for the phase shifts within the zero-correlation zone. The structure of the proposed OZCZ code is simple and their construction is more flexible. The proposed code is expected to be useful for reducing co-channel interference in optical code division multiple access system.

Numerical Analysis of Metro Station Construction by Large-Diameter Shield and Pile-Beam-Arch Method

2011 ◽  
Vol 368-373 ◽  
pp. 2711-2715 ◽  
Author(s):  
De Yun Ding ◽  
Xiu Ren Yang ◽  
Wei Dong Lu ◽  
Wei Ning Liu ◽  
Mei Yan ◽  
...  
Keyword(s):  
Ground Deformation ◽  
Large Diameter ◽  
Element Model ◽  
Construction Method ◽  
Shield Tunnel ◽  
Outer Diameter ◽  
Shield Tunneling ◽  
Metro Station ◽  
Dimensional Finite Element ◽  
New Construction

In more and more complicated urban building environment, a new construction method that metro engineering is constructed by large-diameter shield and shallow mining method can be regarded as a great attempt in China. By taking the Gaojiayuan station of Beijing metro line 14 as an engineering background, the main construction steps for the platform of the metro station built by a large-size shield with an outer diameter of 10 m and the Pile-Beam-Arch (PBA) method are introduced. Based on the soil-structure interaction theory, a two-dimensional finite element model is used to simulate the shield tunneling and the platform construction by the PBA method to enlarge the shield tunnel. The ground deformation and structural stress of the platform are predicted. The numerical results can be regarded as a valuable reference for the application of the new construction method in Beijing metro line 14.

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