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为克服空间光通信(FSO)链路受大气湍流效应的影响,将LT码应用到FSO系统中。多进制LT码具有较高的传输效率。提出一种新型度分布函数来改善多进制LT码的译码性能。计算不同进制LT码的译码失败率,并模拟强湍流信道,对采用不同编码方案的FSO性能进行仿真。结果表明:采用新型度分布的LT码能够降低译码失败率,且能有效改善FSO系统在强湍流情况下的性能。
To overcome the effect of atmospheric turbulence on the FSO link, the LT code is applied to the FSO system. Multi-band LT code has a higher transmission efficiency. A new degree distribution function is proposed to improve the decoding performance of LT code. Calculate the decoding failure rate of LT code of different binary system and simulate the strong turbulence channel to simulate the performance of FSO with different coding schemes. The results show that using the new degree distribution LT code can reduce the decoding failure rate and can effectively improve the performance of the FSO system in the case of strong turbulence.