Title :
Proposal of QAM-OFDM System with IDAR Method for Non-Linear Satellite Channel
Author :
Boonsrimuang, Pisit ; Naito, Katsuhiro ; Mori, Kazuo ; Paungma, Tawil ; Kobayashi, Hideo
Author_Institution :
Dept. of Electr. & Electron. Eng., Mie Univ., Tsu
Abstract :
The future satellite communication systems are required to support the higher transmission data rate for providing multimedia services by employing the efficient modulation method such as multi-level QAM. However, the employment of conventional single carrier transmission method with multi-level 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, this paper proposes the multi-level QAM-OFDM technique with IDAR method designed for satellite channel. In the IDAR method, the characteristics of non-linear amplifiers are required to be known at the receiver. This paper also proposes the estimation method for the characteristics of the non-linear amplifiers by using low PAPR preamble symbols. Various computer simulations are conducted in this paper to verify the effectiveness of proposed method in the non-linear satellite channel
Keywords :
OFDM modulation; quadrature amplitude modulation; radiofrequency amplifiers; satellite communication; wireless channels; Earth station; IDAR method; OFDM system; QAM; modulation method; multimedia services; nonlinear amplifiers; nonlinear satellite channel; satellite communication systems; Computer simulation; Degradation; Design methodology; Employment; Multimedia systems; Peak to average power ratio; Proposals; Quadrature amplitude modulation; Satellite communication; Satellite ground stations; IDAR; OFDM; PAPR; Satellite; non-linear;
Conference_Titel :
Vehicular Technology Conference, 2006. VTC 2006-Spring. IEEE 63rd
Conference_Location :
Melbourne, Vic.
Print_ISBN :
0-7803-9391-0
Electronic_ISBN :
1550-2252
DOI :
10.1109/VETECS.2006.1683335
