Sang Burm Ryu

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It is very important to reduce PAPR (peak to average power ratio) in the OFDM (orthogonal frequency division multiplexing) communication system. In this paper, we propose an ACE (active constellation extension) method to reduce PAPR without any date rate loss. In this method, the target PAPR is firstly set and then the clipping is used. Next, the active(More)
OFDM (orthogonal frequency division multiplexing) communication system is very robust to the multiplex path interference, and its bandwidth efficiency is also very good for the design of the high speed communication system. However, high PAPR (peak average power ratio) is major drawbacks of OFDM system. In the nonlinear HPA (high power amplifier), the OFDM(More)
High power efficiency and low nonlinear distortion is very important for wireless visible light communication system. OFDM (orthogonal frequency division multiplexing) system has been studied a lot as the method to transmit high speed data in wireless visible light communication system. However, OFDM system has drawbacks which are non-linear distortion by(More)
DDFS-driven PLL synthesizer has a high frequency resolution and wide frequency bandwidth. Since the output of DDFS is a synthesized analog signal, the waveform shaper is needed to provide the digital input for a DDFS-driven PLL synthesizer using the digital type phase detector. Furthermore, a lot of components in a DDFS unit can increase the switching time(More)
The SC-FDMA (single carrier-frequency division multiple access) using DFT spread OFDM was adopted as the uplink standard of the 3GPP LTE (3rd generation partnership project long term evolution). SC-FDMA has very low PAPR (peak to average power ratio) but is sensitive to the ICI (inter carrier interference) by phase noise. In this paper, we analyze the(More)
The SC-FDMA (single carrier-frequency division multiple access) using DFT spread OFDM was adopted as the uplink standard of the 3GPP LTE (3<sup>rd</sup> generation partnership project long term evolution). SC-FDMA has very low PAPR (peak to average power ratio) but is sensitive to the ICI (inter carrier interference) by phase noise. In this paper, we(More)
This paper provides a review on OFDM with different diversity techniques in Wireless<lb>Communication Systems. A comparative study of OFDM, OFDM-CDMA, OFDM MC CDMA,<lb>STBC OFDM CDMA, CI-OFDM (Carrier Interferometry Orthogonal Frequency Division<lb>Multiplexing), MIMO-OFDM, MIMO SFBC CI-OFDM (Multiple Input Multiple Output Space<lb>Frequency Blocking Code(More)
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