Abstract
The satellite-to-ground communications systems are a significant part of the future communications network. Meanwhile, the large capacity is also one of the goals pursued by the communications network community. In this context, the free-space optical (FSO) communications technique is a prospective solution for satellite-to-ground communications. However, atmospheric turbulence is a capital impairment in FSO communications systems. To improving satellite-to-ground laser communications, we construct the geostationary satellite-to-ground communications system employing aperture diversity combined with mode diversity (hybrid diversity) and analyze the performance of the proposed hybrid diversity reception system in this paper. Overall, the hybrid diversity technique exhibits excellent performance of outage probability and average bit error rate (BER). Especially when nominal value of Cn20 is 1.5×10−13m−2∕3, in terms of the BER threshold of 2.2×10−2, the scheme of multiple aperture combined with six-mode diversity (MA-6MD) can economize the transmitted power 3.07W (3.45 dB) and 3.76W (3.93 dB) relative to the scheme of only aperture diversity and the scheme of only six-mode diversity, respectively. For the outage probability of 10%, the MA-6MD scheme can economize the transmitted power 2.51W (3.01 dB) and 3.50W (3.80 dB) relative to the aperture diversity and the six-mode diversity, respectively.
Published Version
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