Supnithi, Pornchai
Loading...
Preferred name
Supnithi, Pornchai
Alternative Name
Supnithi, P.
Supnithi, Pomchai
Main Affiliation
Email
pornchai.su@kmitl.ac.th
18 results
Now showing 1 - 10 of 18
- Some of the metrics are blocked by yourconsent settings
Item type:Publication, Rain attenuation of satellite link in Ku-band at Bangkok(2005-12-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, An inter-track interference mitigation technique using partial ITI estimation in patterned media storage(2009-01-01); Tantaswadi, PrinyaThe readback signal of patterned media storage (PMS) is corrupted by a two-dimensional interference consisting of inter-symbol interference (ISI) and inter-track interference (ITI). In this paper, we apply the turbo equalization to mitigate the ITI effects. The codeword of the outer code is divided and then written on three separate tracks. After the first iteration, the bit estimates from the outer code provide partial ITI estimates for the branch metric computation in the soft-output viterbi algorithm (SOVA) detectors. Unlike previous works, the number of states of the channel trellis is due to the ISI only since the ITI information is not embedded in the parallel branches. When compared with the modified SOVA detectors with multi-parallel branches, simulation results show that a significant performance gain is achieved by our proposed method. © 2009 IEEE. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Modeling and measurement of airplane flutter phenomena on TV broadcasting signal(2008-06-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Bi-directional timing recovery for magnetic recording systems(2009-12-01); ; Kovintavewat, PiyaMagnetic recording systems employ conventional timing recovery to synchronize the sampler with the readback signal. However, conventional timing recovery does not perform well when the timing error is large. This paper proposes the bidirectional timing recovery, which utilizes conventional timing recovery to sample the readback signal both in forward direction and in backward direction. The outputs of these two operations are averaged and sent them to the Viterbi detector to determine the most likely input sequence. Results indicate that the bidirectional timing recovery performs better than conventional timing recovery, especially when the timing error is large. ©2009 IEEE. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, The effects of sumatra-andaman earthquake on total ionospheric electron content (TEC) and ionospheric scintillation of GPS signal in thailand(2005-12-01) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Turbo product codes for optical recording systems(2005-12-01)Since the introduction of read-only compact disc (CD-ROM) in the early 80s, optical recording has found its place in mainstream data storage. They are quite a success as removable media particularly in the entertainment and data storage industry. As explosive amount of information in the 90s fueled an ever increasing demand for data storage, further development of optical recording systems in terms of higher capacity, transfer rate and areal density have become major goals in research and development and commercial communities. An evolution of "Blu-ray" and its rival " High-density DVD (HD-DVD)" have recently been envisioned as the next generation optical disc to achieve the recording of a two-hour program in digital HiVision. The standards agree on the capacity of 25 GB with improvement of numerical aperture (NA) and the wavelength alone. As of September 2004, HD-DVD aims to provide 15-GB single-layer disc, and 30-GB dual-layer disc, while Blu-ray aims for upto 27-GB and 54 GB for single-layer and dual-layer discs, respectively [1]. Current formats such as Read-only/Rewritable compact discs (CD-R/RW) and read-only/rewritable digital video discs (DVD-R/RW) are based on storing binary symbols on the optical media. The technology path from CD to DVD employs combined signal processing and coding techniques such as Reed- Solomon codes or RS codes and Runlength-limited codes or RLL codes. To achieve the goal of even higher storage capacity, more sophisticated signal processing and coding techniques would be required. In the early 1990s, there was an evolution of the field of error-correction codes with the introduction of "turbo codes" [2]. For additive white Gaussian noise (AWGN) channel, the novel code provides coding gain that almost reaches the theoretical Shannon capacity. This planted the seed for active research and development in the area of iterative decoding, variants of turbo codes, and turbo equalization in many communication systems. The advanced signal processing and coding such as turbo codes and turbo-like codes thus have a potential of providing additional coding gain as required in the future generations of high-density optical storage systems. In this chapter, the focus is on the use of a variant of turbo codes so called "Turbo Product Codes" [3] in multileveled (ML) optical recording systems. © 2005 Springer. Printed in the Netherlands. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, The analysis of ionospheric scintillation on the global Positioning System (GPS) at Bangkok(2006-12-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Reduced-Complexity Turbo Equalization for High-Density Magnetic Recording Systems(2003-01-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Performance of digital modulation in double Nakagami-m fading channels with MRC diversity(2009-01-01) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Comparison between foF2 observations and IRI-2001 model predictions at Thailand equatorial latitude station(2008-10-06)