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In a museum, a visitor can know introductions of the exhibition gallery with various methods to satisfy a visitor's interest. There is a method using a portable terminal in order to guide. Furthermore, the visitor can know the local introduction of a gallery, if gallery guidance takes in position estimate and calculates a work's sequence number from the visitor's present location. Therefore, we pay...
Energy consumption is a major issue for LDPC decoding. To save LDPC iterative process energy, early terminations are commonly used. Traditional parity check equation is used but has a growing complexity as the block size increases. This requires a large overhead in term of area. This paper proposes an ultra-low complexity early termination (ET) scheme with a small loss of bit error rate performance...
The lifetime degradation of new multi-level cell (MLC) flash devices is becoming more and more serious due to the fast-increasing bit error rate variance among flash pages, where a flash chip consists of multiple blocks and each block consists of a fixed number of pages. Existing works usually discard bad pages in the unit of a block, but result in shortened the device lifetime due to the insufficient...
With the advances of manufacturing technology and aggressive use of multi-level-cell (MLC) for flash memory, flash memory has faced a serious challenge on its device lifetime due to the fast-decreasing capacity caused by worn-out blocks. In contrast to existing works, we propose a block reinforcement scheme to optimize the guaranteed lifetime of flash storage devices by extending the useable period...
In visible light communication (VLC) systems, the employing of orthogonal frequency division multiplexing (OFDM) may produce nonlinear distortion, due to the nonlinear characteristics of LEDs and the high peak to average power ratio (PAPR) of OFDM. Moreover, the clipping block deteriorates the distortion. In this paper, an advanced A-law algorithm for alleviating such distortion in VLC-OFDM systems...
We experimentally demonstrate a visible light communication (VLC) system using pulse amplitude modulation (PAM). A commercially available phosphorised white LED is used as the optical transmitter and a Si photodiode (PD) is used as the optical receiver. The experiment is mainly implemented in an indoor environment which is influenced by the sunlight and fluorescent lamp. In variant conditions, the...
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