An adaptive transmission scheme of MIMO-OFDM system based on MQAM and LDPC code is proposed. An transmit optimization algorithm to obtain an bit and power allocation is used which selects the MCS requiring only the mean and variance assuming the received LLR distrbution as Gaussian. Simulation results show the performance of the proposed scheme is up to about 3dB better than other transmission schemes at the expense ofa few bits in the feedback information.
Satellite-communication effectiveness evaluation is one of the key issues in the field of satellite communication links for satellite operation, maintenance, and emergency communication. However, conventional model-based calculation methods require accurate meteorological parameters, thus not applicable to practical engineering problems. In this paper, a hybrid method, combing direct calculation and equilibrium approximation, is proposed to evaluate the effectiveness of a satellite communication system, with distributed multi-node receiver stations on the earth. Especially, the proposed equilibrium approximation approach is resilient to meteorological factors. Field tests corroborate the feasibility of this new method for real-world problems.
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