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Reduction in transmitter power requirement for earth- to-satellite and satellite-to-earth free space optical links with spatial diversity

机译：降低具有空间分集的地对卫星和卫星对地自由空间光链路的发射机功率要求

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In the scenario of first laser communication relay satellite being launched into geostationary earth orbit, we evaluate the reduction in transmitter power requirement for earth-to-satellite and satellite-to-earth free space optical links in presence of turbulence and various weather conditions using spatial diversity technique. In channel modeling, Beer Lambert Law incorporates the weather effects. The log-normal probability density function (pdf) models weak turbulence and gamma-gamma pdf moderate to strong turbulence. Using the combined channel state pdf, bit error rate (BER) expressions are derived for on-off keying (OOK), M-ary pulse position modulation (M-PPM) and M-ary differential PPM (M-DPPM) schemes. From the BER plots, we evaluate the minimum average received power required to achieve a desired BER for all three schemes for different channel conditions. Subsequently, minimum transmitter power requirement is evaluated for both uplink and downlink using the range equation. It is observed that presence of moderate, light and thin fog cause additional power requirement. Also, among the three schemes, M-PPM scheme requires the least transmitter power, followed by M-DPPM and OOK schemes. Further, it is seen that the transmitter diversity or multiple input single output technique reduces the uplink minimum transmitter power requirement, whereas for downlink aperture averaging and receiver diversity or single input multiple output techniques can achieve the same. The power requirement for uplink is 8-10 dB more as compared to downlink in presence of turbulence and various weather conditions.
机译：在第一颗激光通信中继卫星发射到地球静止地球轨道的情况下，我们评估了在存在湍流和各种天气条件的情况下使用空间的地面对卫星和卫星对地自由空间光链路的发射机功率要求的降低分集技术。在通道建模中，《 Beer Lambert Law》纳入了天气影响。对数正态概率密度函数（pdf）对弱湍流建模，而γ-gammapdf对中湍流至强湍流建模。使用组合的信道状态pdf，可以得出开关键控（OOK），M进制脉冲位置调制（M-PPM）和M进制差分PPM（M-DPPM）方案的误码率（BER）表达式。从BER图中，我们评估了针对不同信道条件的所有三种方案实现理想BER所需的最小平均接收功率。随后，使用范围公式评估上行链路和下行链路的最小发射机功率要求。观察到，中等，轻度和薄雾的存在引起额外的功率需求。同样，在这三种方案中，M-PPM方案需要最少的发射机功率，其次是M-DPPM和OOK方案。此外，可以看出，发射机分集或多输入单输出技术降低了上行链路最小发射机功率要求，而对于下行链路孔径平均和接收机分集或单输入多输出技术可以实现相同的效果。与存在湍流和各种天气情况的下行链路相比，上行链路的功率要求比下行链路高8-10 dB。

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