Optimization of LDPC codes for bit-patterned media recording with media noise

2016 ◽  
Author(s):  
Lingjun Kong ◽  
Shengmei Zhao ◽  
Ming Jiang ◽  
Chunming Zhao
Keyword(s):  
Ldpc Codes ◽  
Bit Patterned Media ◽  
Patterned Media ◽  
Media Noise

Determination of Bit Patterned Media Noise Based on Island Perimeter Fluctuations

2012 ◽  
Vol 48 (11) ◽  
pp. 4574-4577 ◽  
Author(s):  
Laurens Alink ◽  
J. P. J. Groenland ◽  
Jeroen de Vries ◽  
Leon Abelmann
Keyword(s):  
Bit Patterned Media ◽  
Patterned Media ◽  
Media Noise

scholarly journals Target and Equalizer Design for High-Density Bit-Patterned Media Recording

1970 ◽  
Vol 6 (2) ◽  
pp. 128-135
Author(s):  
Santi Koonkarnkhai ◽  
Phongsak Keeratiwintakorn ◽  
Piya Kovintavewat
Keyword(s):  
Partial Response ◽  
Mean Squared Error ◽  
Bit Patterned Media ◽  
Patterned Media ◽  
Media Noise ◽  
Minimum Mean Squared Error ◽  
Squared Error ◽  
Cross Track ◽  
Partial Response Maximum Likelihood ◽  
Better Than

In bit-patterned media recording (BPMR) channels, the inter-track interference (ITI) is extremely severe at ultra high areal densities, which significantly degrades the system performance. The partial-response maximum-likelihood (PRML) technique that uses an one-dimensional (1D) partial response target might not be able to cope with this severe ITI, especially in the presence of media noise and track mis-registration (TMR). This paper describes the target and equalizer design for highdensity BPMR channels. Specifically, we proposes a two-dimensional (2D) cross-track asymmetric target, based on a minimum mean-squared error (MMSE) approach, to combat media noise and TMR. Results indicate that the proposed 2D target performs better than the previously proposed 2D targets, especially when media noise and TMR is severe.

Trellis-Based Detecting the Insertion and Deletion Bits for Bit-Patterned Media Recording

2014 ◽  
Vol 979 ◽  
pp. 54-57 ◽  
Author(s):  
Santi Koonkarnkhai ◽  
Piya Kovintavewat ◽  
Phongsak Keeratiwintakorn
Keyword(s):  
Detection Method ◽  
Signal To Noise Ratio ◽  
Areal Density ◽  
Specific Marker ◽  
Magnetic Medium ◽  
Bit Patterned Media ◽  
Patterned Media ◽  
Media Noise ◽  
Insertion And Deletion ◽  
Better Than

Bit-patterned media recording (BPMR) is one of the promising technologies for realizing an areal density up to 4 Tb/in2; however, it poses new challenges to read channel design, including the two-dimensional (2D) interference, media noise, and track mis-registration. Furthermore, the BPMR system encounters the insertion, deletion and substitution errors, which are primarily caused by mis-synchronization between the write clock and the island positions. In this paper, we propose a novel detection method that exploits the trellis structure to detect the occurrence of insertion/deletion bits. Specifically, the specific marker bits are inserted periodically inside an input data sequence before recording onto a magnetic medium. Hence, the branch metric calculation is monitored during the marker bits to determine if there is any insertion/deletion error in the system. Numerical results indicate that the proposed method can performs better than the conventional one in terms of the percentage of detection and the percentage of missed detection and false-alarm, especially at low signal-to-noise ratio scenario.

Modeling, detection, and LDPC codes for bit-patterned media recording

2010 ◽  
Author(s):  
Kui Cai ◽  
Zhiliang Qin ◽  
Songhua Zhang ◽  
Yibin Ng ◽  
Kaosiang Chai ◽  
...  
Keyword(s):  
Ldpc Codes ◽  
Bit Patterned Media ◽  
Patterned Media

Modeling and Two-Dimensional Equalization for Bit-Patterned Media Channels With Media Noise

2009 ◽  
Vol 45 (10) ◽  
pp. 3535-3538 ◽  
Author(s):  
Yibin Ng ◽  
Kui Cai ◽  
B.V.K.V. Kumar ◽  
Songhua Zhang ◽  
Tow Chong Chong
Keyword(s):  
Two Dimensional ◽  
Bit Patterned Media ◽  
Patterned Media ◽  
Media Noise ◽  
Media Channels

Serial Belief Propagation for The High-Rate LDPC Decoders and Performances in The Bit Patterned Media Systems With Media Noise

2011 ◽  
Vol 47 (10) ◽  
pp. 3562-3565 ◽  
Author(s):  
Watid Phakphisut ◽  
Pornchai Supnithi ◽  
Thanomsak Sopon ◽  
Lin M. M. Myint
Keyword(s):  
Belief Propagation ◽  
High Rate ◽  
Bit Patterned Media ◽  
Patterned Media ◽  
Media Noise ◽  
Media Systems

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.

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