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A coding scheme using redundant bits for bit patterned media recording channel without overshoot
(2014-02-12)
Arrayangkool, Autthasith
In bit patterned magnetic recording (BPMR), The two-dimensional (2D) interference composed of inter-symbol and inter-track interference is a major problem especially at high areal density (AD). One way to alleviate the destructive effect of 2D interference is to deploy a 2D coding scheme on an input data sequence before recording in order to avoid some data patterns that easily cause an error at the data readback process. However, some coding schemes generate high complexity. Consequently, this paper proposes a new low-complexity modulation code with redundant bits to eliminate the data patterns leading to severe 2D interference and compare overall system performance. Experimental results indicate that the system with the proposed code is superior to that without coding, especially when the AD is high and/or the position jitter is large.
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A simple crossover-based coding technique for ITI mitigation in bit-patterned media recording
(2014-02-12)
Ketwong, Panuwat
;
Arrayangkool, Autthasith
;
Warisarn, Chanon
;
Myint, Lin Min Min
;
Kovintavewat, Piya
Due to bits being recorded at ultra-high density, a bit-patterned media recording (BPMR) system is faced with two-dimensional (2D) interference, namely inter-symbol interference (ISI) and inter-track interference (ITI), which degrades the overall performance of a recording system. One solution to avoid the 2D interference effect is to apply a modulation code to forbid some specific data patterns leading to severe 2D interference. Nonetheless, this method usually requires either many redundant bits or additional memory. Thus, this paper proposes a simple technique to encode an input data sequence to mitigate the 2D interference effect before recording them onto a magnetic medium. The proposed technique shows the improvement in reducing complexity and additional memory using a crossover-based technique when comparing to other existing methods.
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A simple recorded-bit patterning scheme for bit-patterned media recording
(2013-09-02)
Arrayangkool, Autthasith
;
Warisarn, Chanon
;
Myint, Lin M.M.
;
Kovintavewat, Piya
In bit-patterned magnetic recording (BPMR), inter-symbol interference (ISI) and inter-track interference (ITI) become a major impairment due to small bit and track pitches. One way to alleviate ISI and ITI is to encode the data sequence before recording. In general, two-dimensional (2D) coding scheme requires many redundant bits, thus lowering the code rate. This paper proposes a novel 2D coding scheme (referred to as a simple recorded-bit patterning (RBP) scheme) with high code rate to combat both ISI and ITI effects. Specifically, the data bits will first be patterned by finding the best data pattern based on a look-up table that can avoid severe ISI and ITI effects before recording. Simulation results indicate that the proposed scheme can provide a significant performance improvement if compared to the system without coding. © 2013 IEEE.
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A recorded-bit patterning scheme with accumulated weight decision for bit-patterned media recording
(2013-01-01)
Arrayangkool, Autthasith
;
Warisarn, Chanon
;
Kovintavewat, Piya
To achieve high recording density in a bit-patterned media recording system, the spacing between data bit islands in both the alongtrack and the across-track directions must be decreased, thus leading to the increase of two-dimensional (2D) interference. One way to reduce the 2D interference is to apply a 2D coding scheme on a data sequence before recording; however, this method usually requires many redundant bits, thus lowering a code rate. Therefore, we propose a novel 2D coding scheme referred to as a recorded-bit patterning (RBP) scheme to mitigate the 2D interference, which requires no redundant bits at the expense of using more buffer memory. Specifically, an input data sequence is first split into three tracks in which will then be rotated to find the best 3-track data pattern based on a look-up table before recording, such that the shifted data tracks yield the least effect of 2D interference in the readback signal. Numerical results indicate that the proposed RBP scheme provides a significant performance improvement if compared to a conventional system (without 2D coding), especially when the recording density is high and/or the position jitter noise is large. Copyright © 2013 The Institute of Electronics, Information and Communication Engineers.
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A flexible intelligent transportation system architecture model with object oriented methodology and UML
(2009-12-01)
Arrayangkool, Autthasith
;
Unakul, Apinetr
Nowadays, some ITS architectures are wildly used and they describe main structural and functional process of ITS system in a format of data flow diagrams. These diagrams have intensive rigidity, non-reusable property, large size and complexity. Disadvantages of data flow diagrams can be dissipated by using object oriented process and UML. UML can represent ITS systems in diverse views and have many types of diagram for communication with varied persons from diverse domains. The object oriented methodology has flexibility and reusable characteristic. Therefore, by using object oriented process and UML, designers or developers can understand, design, develop and deploy ITS systems easily. This paper describes details and benefits of object oriented ITS architecture and comparisons of object oriented design with another design methodology. ©2009 IEEE.

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