A new two dimensional spectral/spatial multi-diagonal code for noncoherent optical code division multiple access (OCDMA) systems

2014 ◽  
Vol 329 ◽  
pp. 28-33 ◽  
Author(s):  
Rasim Azeez Kadhim ◽  
Hilal Adnan Fadhil ◽  
S.A. Aljunid ◽  
Mohamad Shahrazel Razalli
Keyword(s):  
Code Division Multiple Access ◽  
Multiple Access ◽  
Two Dimensional ◽  
Code Division Multiple

Techno-economic analysis of two dimensional optical code division multiple access systems

2020 ◽  
Vol 53 (1) ◽  
Author(s):  
Waqas A. Imtiaz ◽  
Hassan Yousef ◽  
Median Zeghid ◽  
Teena Sharma ◽  
Jawad Mirza
Keyword(s):  
Economic Analysis ◽  
Code Division Multiple Access ◽  
Multiple Access ◽  
Two Dimensional ◽  
Code Division Multiple

Enhanced Performances of W/S SAC-OCDMA System Using LDPC Code

2019 ◽  
Vol 0 (0) ◽  
Author(s):  
A. Bouarfa ◽  
M. Kandouci ◽  
S. Bojanic
Keyword(s):  
Bit Error Rate ◽  
Code Division Multiple Access ◽  
Multiple Access ◽  
Ldpc Code ◽  
Two Dimensional ◽  
Parity Check ◽  
Low Density Parity Check ◽  
Spectral Coding ◽  
Code Division Multiple ◽  
Better Than

AbstractIn an incoherent optical code division multiple access (OCDMA) system using amplitude spectral coding (SAC), which exceeds 1.5 Gbps, it is difficult or impossible to make a transmission with a bit error rate better than 10–9. For this, it is necessary to associate an error correction code (ECC) to the SAC-OCDMA system. In this paper, we proposed an architecture of a two-dimensional SAC-OCDMA system (spectral (w) and spatial (s)) using multi-diagonal code (MD) as spreading code and low-density parity check code (LDPC) as ECC. According to the properties of the MD code and the proposed architecture, the phase induced intensity noise is eliminated, which has improved the performance of the system. The theoretically results shows that LDPC/2D-SAC-OCDMA allowing more than 40 users to be multiplexed compared to a non-coded 2D SAC-OCDMA system. This combination allowed us to increase the cardinality of the LDPC/SAC-OCDMA (W/S) system without using an optical hard limiter.

scholarly journals Enhancement of optical code division multiple access system based on 2D ZCC/MD spectral/spatial code

2019 ◽  
Vol 14 (2) ◽  
pp. 661
Author(s):  
Rima Matem ◽  
S. A. Aljunid ◽  
M. N Junita ◽  
C. B. M Rashidi ◽  
Israa Shihab Aqrab
Keyword(s):  
Code Division Multiple Access ◽  
Multiple Access ◽  
Cross Correlation ◽  
Spatial Code ◽  
Two Dimensional ◽  
Effective Power ◽  
One Dimensional ◽  
Access System ◽  
Code Division Multiple ◽  
Multiple Access System

<span>The combination of 1D zero cross correlation (ZCC) and 1D Multi Diagonal (MD) results a new two dimensional hybrid called 2D ZCC/MD code for spectral/spatial OCDMA system. The proposed code aims to enhance the functional qualities of Optical Code Division Multiple Access (OCDMA) and to overcome the limitations of one dimensional codes. In this paper,   2D ZCC/MD is evaluated at data rate; 622Mbps.  A comparison of the proposed 2D ZCC/MD code to 1D Random Diagonal (RD) and 1D Modified Double Weight (MDW) highlight that 2D ZCC/MD  can support  a large number of active  users even at the higher user bit rate. Furthermore, in term of effective power 2D ZCC/MD can achieve lower effective power.</span>

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