A New Way to Optimize LDPC Code in Multiple Access Channel

2014 ◽  
Vol 989-994 ◽  
pp. 4095-4099
Author(s):  
Jing Xi Zhang
Keyword(s):  
Differential Evolution ◽  
Maximum Degree ◽  
Multiple Access ◽  
Ldpc Codes ◽  
Ldpc Code ◽  
Multiple Access Channel ◽  
Access Channel ◽  
Noise Threshold ◽  
Irregular Ldpc Codes ◽  
Combination Technology

A new way to optimize the degree profiles for irregular LDPC codes in MAC is presented. The combination technology of differential evolution and density evolution is applied in the optimizing of degree distributions. By using a greedy algorithm we show the differential evolution method to seek the maximum noise threshold in MAC channels under different degree number and maximum degree condition.

scholarly journals LDPC Code Design for the Two-User Gaussian Multiple Access Channel

2016 ◽  
Vol 15 (4) ◽  
pp. 2833-2844 ◽  
Author(s):  
Shahrouz Sharifi ◽  
A. Korhan Tanc ◽  
Tolga M. Duman
Keyword(s):  
Multiple Access ◽  
Ldpc Code ◽  
Multiple Access Channel ◽  
Code Design ◽  
Access Channel

Partially Repeated SC-LDPC Codes for Multiple-Access Channel

2016 ◽  
Vol 20 (10) ◽  
pp. 1947-1950 ◽  
Author(s):  
Yuhao Chi ◽  
Ying Li ◽  
Guanghui Song ◽  
Yue Sun
Keyword(s):  
Multiple Access ◽  
Ldpc Codes ◽  
Multiple Access Channel ◽  
Access Channel

Optimization of LDPC Codes by Extrinsic Information Transfer Chart

2013 ◽  
Vol 427-429 ◽  
pp. 1518-1523
Author(s):  
Jing Xi Zhang
Keyword(s):  
Information Transfer ◽  
Multiple Access ◽  
Gaussian Approximation ◽  
Additive White Gaussian Noise ◽  
Ldpc Code ◽  
Multiple Access Channel ◽  
Parity Check ◽  
Extrinsic Information ◽  
Access Channel ◽  
Check Matrix

The optimization of degree profiles of low-density parity-check (LDPC) code in additive white Gaussian noise (AWGN) multiple access channel (MAC) by fitting the transfer characteristics of variable nodes detector (VND) and that of check nodes detector (CND) is discussed. Extrinsic information transfer (EXIT) characteristics are used for determining the degree profiles based on curve fitting. The convergence the optimized LDPC code is ensured by the EXIT characteristics of VND and CND. Degree profiles are obtained and check matrix is constructed. Simulation results show that the method is variable in designing LDPC code degree profiles in MAC with reduced complexity compared with density evolution based on Gaussian approximation.

SC-LDPC code design for Gaussian multiple access channel

2016 ◽  
Vol 10 (17) ◽  
pp. 2402-2406 ◽  
Author(s):  
Md. Noor-A-Rahim ◽  
Khoa D. Nguyen ◽  
Gottfried Lechner
Keyword(s):  
Multiple Access ◽  
Ldpc Code ◽  
Multiple Access Channel ◽  
Code Design ◽  
Access Channel
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