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Toward an Optimal Combined FSO/RF System via an Adaptive Bit Rate Control

机译:通过自适应比特率控制实现最优组合FSO / RF系统

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In hybrid FSO/RF (Free Space Optics/Radio Frequency) systems, the FSO link is the primary link while the RF link is the secondary (backup) link. In current hybrid systems, once the FSO signal to noise ratio (SNR) decreases above a preset threshold, the system switches from FSO to RF to maintain the communication connection. But this scenario does not provide maximum utilization of the available bandwidth in terms of spectrum efficiency. This paper proposes an adaptive FSO bit rate algorithm to maintain communication using the FSO link as long as its bit rate is greater than that can be offered by the RF, thus requiring no switching to the secondary link. The system switches to the secondary link if and only if the FSO bit rate while maintaining the system bit error rate (BER) drops below the bit rate that can be achieved by the RF link. This paper shows the dependence of FSO bit error rate on channel bit rate using analysis and computer simulation. Furthermore, computer simulation is carried out and the results confirm the algorithm's effectiveness on maintaining higher bit rate communication connection using FSO link. Hence, the overall system performance achieves better throughput.
机译:在混合FSO / RF(自由空间光学/射频)系统中,FSO链接是主要链接,而RF链接是次要(备用)链接。在当前的混合系统中,一旦FSO信噪比(SNR)降低到预设阈值以上,系统就会从FSO切换到RF,以维持通信连接。但是从频谱效率的角度来看,这种情况不能最大程度地利用可用带宽。本文提出了一种自适应FSO比特率算法,只要它的比特率大于RF可以提供的比特率,就可以维持使用FSO链路的通信,因此无需切换到辅助链路。当且仅当在保持系统误码率(BER)的同时FSO比特率降至RF链路可以达到的比特率以下时,系统才会切换到辅助链路。本文通过分析和计算机仿真显示了FSO误码率对信道比特率的依赖性。此外,进行了计算机仿真,结果证实了该算法在使用FSO链路保持较高比特率通信连接方面的有效性。因此,整体系统性能可实现更好的吞吐量。

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