Sang-Sung Choi

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The purpose of this study is to determine the characteristic clinical features, radiologic findings, and precipitating and prognostic factors in the patients with breast cancer and with 5-Fluorouracil (5-FU)-induced leukoencephalopathy. We reviewed the medical records of six breast cancer patients who developed leukoencephalopathy after chemotherapy which(More)
In this paper, we present a 4-parallel fast Fourier transform (FFT) processor for a multi-band orthogonal frequency division multiplexing (MB-OFDM) ultra wideband (UWB) system. The proposed FFT processor utilizes radix-2<sup>4</sup> structure so as to significantly enhance the hardware complexity by reducing the numbers of multipliers and adders. The(More)
Kyu-Min Kang et al. 495 This paper presents a parallel processing searcher structure for the initial synchronization of a direct sequence ultra-wideband (DS-UWB) system, which is suitable for the digital implementation of baseband functionalities with a 1.32 Gsample/s chip rate analog-todigital converter. An initial timing acquisition algorithm and a data(More)
In this paper, we propose a new modulation scheme for low power and high performance WBAN in-body communication systems. Simulation results are presented in terms of performance and transmit power. The proposed modulation scheme is more appropriate for high data rate human body applications than other schemes due to the better characteristic of spectral(More)
Ultra-wideband (UWB) systems use wide band-width of 3.1 to 10.6 GHz to provide ultra high data-rate for wireless applications. Implementation of UWB RF transceiver in the 3-5 GHz band (mandatory mode) makes big challenges that must be solved by circuit and system techniques. The proposed radio frequency(RF) transceiver, which is implemented in 0.13μm(More)
This paper describes a 3 to 5 GHz frequency synthesizer for MB-OFDM (multi-band OFDM) UWB (Ultra- Wideband) application using 0.13 um CMOS process. The frequency synthesizer operates in the band group 1 whose center frequencies are 3432 MHz, 3960 MHz, and 4488 MHz. To cover the overall frequencies of group 1, an efficient frequency planning minimizing a(More)
⎯ The MB-OFDM UWB for IEEE802.15.3a uses a R=1/3 convolutional code for the error correcting code. Furthermore, it uses a Reed-Solomon code to protect the PLCP header from impairment. In this paper, we show a detailed hardware architecture and implementation results of FEC (forward error correction) for the MB-OFDM UWB. We propose a Viterbi decoder with(More)