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improve satellite communications channel transmission efficiency of new ways this paper V SAT satellite communications system design involving Wei Star Communication Technology extremely important channel coding and modulation and demodulation, explore a variety of new satellite channel coding and modulation and demodulation techniques, their principles and satellite communications applications. Digital modulation, signal transmission depends on the quality of the main bit error rate BER (Bit Error Rate). therefore possible to use the same energy per bit signal with noise power spectral density ratio (Eb/N.), under the condition BER low modulation mode to save power satellite bandwidth utilization addition to the possible high to save valuable satellite frequency bands. This paper is als
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