RISS 검색 - 국내학술지논문

1
Organizing Chair’s Message

Tawil Paungma 제어로봇시스템학회 2004 제어로봇시스템학회 국제학술대회 논문집 Vol.2004 No.8
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2
QAM-OFDM System with IDAR Method in Satellite Channel

Boonsrimuang, Pisit,Mori, Kazuo,Paungma, Tawil,Kobayashi, Hideo 통신위성우주산업연구회 2004 Joint Conference on Satellite Communications Vol.2004 No.-
- 원문보기
The future satellite communications system is required to support the higher transmission data rate for providing the multimedia services by employing the efficient modulation method such as multi-level QAM. However, the employment of multi-level QAAM in the satellite channel would cause the fatal degradation of signal quality due to the non-linear amplifiers located at the earth station and satellite. To overcome this problem, we have proposed the multi-level QAM-OFDM technique with IDAR (Improved Decision Aided Reconstruction) method. In the IDAR method, the characteristic of non-linear amplifier is required as the known data at the receiver for mitigating the inter-modulation noise. This paper proposes the estimation method for AM-AM and AM-PM characteristics of non-linear amplifier by using the low PAPR (Peak to Averaged Power Ratio) preamble symbols. This paper presents various computer simulation results to verify the effectiveness of proposed method in the non-linear satellite channel.
3
Proposal of Estimation Method for Non-linear Amplifier Characteristics in Satellite Channel

Boonsrimuang, Pisit,Naito, Katsuhiro,Mori, Kazuo,Paungma, Tawil,Kobayashi, Hideo 통신위성우주산업연구회 2005 Joint Conference on Satellite Communications Vol.2005 No.-
- 원문보기
OFDM technique having the higher PAPR performance has been considered as unsuitable transmission technique for the non-linear satellite channel. To solve this problem, we have already proposed the OFDM-IDAR method, which can mitigate the non-linear distortion and achieve the higher transmission data rate with keeping the better BER performance. In the IDAR method, however the input and output relationships of non-linear amplifier characteristics located at the transmit earth station and satellite are required at the receiver. This paper proposes the estimation method for AM-AM and AM-PM conversions characteristics of non-linear amplifiers by using low PAPR preamble symbols. The various computer simulations are conducted in this paper to verify the effectiveness of proposed method in the non-linear satellite channel.
4
Proposal of QAM-OFDM System with DSI and IDAR Method in Satellite Channel

Boonsrimuang, Pisit,Naito, Katsuhiro,Mori, Kazuo,Paungma, Tawil,Kobayashi, Hideo 통신위성우주산업연구회 2005 Joint Conference on Satellite Communications Vol.2005 No.-
- 원문보기
The future satellite communication systems are required to support the higher transmission data rate for providing the multimedia services by employing the efficient modulation method such as multi-level QAM. However, the employment of conventional single carrier transmission method with multilevel QAM would cause the fatal degradation of signal quality due to the non-linear amplifiers located at the earth station and satellite. To overcome this problem, we have proposed the multi-level QAM-OFDM technique with IDAR method designed for non-linear satellite channel. However, the proposed method could not mitigate the non-linear distortion sufficiently when modulation level becomes higher such as 64QAM. This paper proposes the combined scheme for PAPR reduction method employed at the transmitter and OFDM-IDAR method employed at the receiver so as to enable the usage of higher multi-level QAM method. The proposed method can achieve the higher transmission data rate with keeping the better bit error rate performance even in the non-linear satellite channel. The various computer simulations are conducted in this paper to verify the effectiveness of proposed method in the non-linear satellite channel.

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