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The Study on The Application of QAM-OFDM Scheme for Nonlinear Satellite Channel  

Lee, Hae-Seon (Dongyang Technical College, School of Electrical Engineering)
Publication Information
전자공학회논문지 IE / v.45, no.1, 2008 , pp. 44-49 More about this Journal
Abstract
In this paper, the performance for the non-linear satellite channel including the characteristics of group delay and gain ripple of transponder is analyzed with multi-level QAM-OFDM schemes. Comparing the BER performances between general OFDM and CI(Carrier Interferometry)-OFDM for various QAM schemes, the degree of performance improvement is presented in AWGN environments for specified nonlinear characteristics. The simulations are performed with the 36MHz bandwidth of transponder channel and 120Mbps transmission rate for QPSK, 8QAM, 16QAM, 32QAM, 64QAM schemes between normal and worst case condition. It is shown that the improvement measure by the CI-OFDM for the group delay of channel and nonlinear characteristic of HPA outperforms that for the gain ripple in the case of higher level QAM scheme in normal condition. And the simulation results show that the additional techniques like the channel coding and compensation scheme against the nonlinear characteristic are required for 32QAM and higher level QAM in worst case condition.
Keywords
satellite; ofdm; CI-ofdm; nonlinearity;
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