Parity check matrix construction of LDPC codes in bit-patterned media recording channels using Tippett's random number table

2013 ◽  
Author(s):  
Chutima Prasartkaew ◽  
Piya Kovintavewat ◽  
Somsak Choomchuay
Keyword(s):  
Random Number ◽  
Ldpc Codes ◽  
Parity Check ◽  
Parity Check Matrix ◽  
Bit Patterned Media ◽  
Patterned Media ◽  
Check Matrix ◽  
Recording Channels ◽  
Random Number Table ◽  
Matrix Construction

Combined Coding Algorithm of LDPC Codes in Bit-Patterned Media Recording Channels

2014 ◽  
Vol 979 ◽  
pp. 70-74
Author(s):  
Chutima Prasartkaew ◽  
Piya Kovintavewat ◽  
Somsak Choomchuay
Keyword(s):  
Random Number ◽  
Signal To Noise Ratio ◽  
Ldpc Codes ◽  
Block Codes ◽  
High Signal ◽  
Bit Patterned Media ◽  
Magic Square ◽  
Patterned Media ◽  
Recording Channels ◽  
Random Number Table

This paper presents a new coding algorithm of irregular low-density parity-check (LDPC) codes. This algorithm consists of two parts of block codes; parity bits was encoded using the magic square based algorithm (MSBA) which suitable for the short block (less than 500 bits) and the data bits, the rest part of all block codes, was encoded using the random number table. This proposed coding algorithm is called ‘Combined Coding Algorithm LDPC codes (CCA-LDPC codes)’ which can be used in bit-patterned media recording (BPMR) channels. The performance of the constructed codes was numerically simulated in BPMR channels model. The obtained performance of the proposed codes was compared with the comparable existing codes. The simulation results show that, at a block length of 4110 bit and code rate of 0.9, the proposed CCA-LDPC codes yields better performance than the existing ones, especially at high signal-to-noise ratio scenario.

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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