BER performance due to irregularity of row-weight distribution of the parity-check matrix in irregular LDPC codes for 10-gb/s optical signals

2005 ◽  
Vol 23 (9) ◽  
pp. 2673-2680 ◽  
Author(s):  
Jinhyun Youn ◽  
H. Jang ◽  
Kyoungsoo Kim ◽  
Jichai Jeong
Keyword(s):  
Weight Distribution ◽  
Ldpc Codes ◽  
Parity Check ◽  
Parity Check Matrix ◽  
Optical Signals ◽  
Check Matrix ◽  
Irregular Ldpc Codes ◽  
Ber Performance

Parity-Check Matrix Extension to Lower the Error Floors of Irregular LDPC Codes

2011 ◽  
Vol E94-B (6) ◽  
pp. 1725-1727
Author(s):  
Jianjun MU ◽  
Xiaopeng JIAO ◽  
Jianguang LIU ◽  
Rong SUN
Keyword(s):  
Ldpc Codes ◽  
Parity Check ◽  
Parity Check Matrix ◽  
Check Matrix ◽  
Irregular Ldpc Codes ◽  
Error Floors ◽  
Matrix Extension

scholarly journals Design LDPC Codes without Cycles of Length 4 and 6

2008 ◽  
Vol 2008 ◽  
pp. 1-5 ◽  
Author(s):  
Jun Fan ◽  
Yang Xiao ◽  
Kiseon Kim
Keyword(s):  
Ldpc Codes ◽  
Cyclic Shift ◽  
Parity Check ◽  
Parity Check Matrix ◽  
Awgn Channel ◽  
Check Matrix ◽  
The Matrix ◽  
Random Codes ◽  
Ber Performance

We present an approach for constructing LDPC codes without cycles of length 4 and 6. Firstly, we design 3 submatrices with different shifting functions given by the proposed schemes, then combine them into the matrix specified by the proposed approach, and, finally, expand the matrix into a desired parity-check matrix using identity matrices and cyclic shift matrices of the identity matrices. The simulation result in AWGN channel verifies that the BER of the proposed code is close to those of Mackay's random codes and Tanner's QC codes, and the good BER performance of the proposed can remain at high code rates.

New Optical Codes Based on Construction of Parity Check Matrix of LDPC Codes

2019 ◽  
Vol 0 (0) ◽  
Author(s):  
Mohammed Amine Tehami ◽  
Chahinaz Kandouci ◽  
Ali Djebbari
Keyword(s):  
Code Division Multiple Access ◽  
Cross Correlation ◽  
Direct Detection ◽  
Ldpc Codes ◽  
Parity Check ◽  
Parity Check Matrix ◽  
Check Matrix ◽  
Eye Pattern ◽  
Balanced Detection ◽  
Code Division Multiple

AbstractIn this paper, new spectral optical codes based on the construction parity check matrix of LDPC codes were designed and implemented in an optical code-division multiple access communication system. Two types optical family codes can be obtained with respectively a cross correlation of {\lambda _c} = 0 and {\lambda _c} = 1. In each case, the codes can either be decoded using the direct detection or the balanced detection. Performance was evaluated by referring to the Q factor, the bit error rate and the eye pattern diagrams using Optisystem 9.0.

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