Summary: Abstract-- Hybrid Free Space Optics (FSO)/Radio Frequency
(RF) communication systems have emerged as a way to improve
network performance by providing enhanced availability and
reliability. In an effort to mitigate individual drawbacks in the
optical link during adverse weather conditions, network traffic
flows simultaneously between channels. Based on the Shannon
Hartley theorem, channel capacity is dependent, among others,
on both the signal to noise ratio (SNR) and channel bandwidth.
As such, combined link throughput may be affected by channel
state conditions. Because atmosphere turbulence can be modeled
as a time-varying fading channel, capacity analysis can be
investigated. In this paper, authors apply various availability
scenarios of channel state information (CSI) on the optical link to
derive closed-form expressions for combined link capacity.
Numerical simulation provides a comparison to the results.
Keywords-- Hybrid FSO/RF link, channel capacity, channel
state information (CSI), reconfiguration, and lognormal fading.
In the event that an FSO link is obscured in a hybrid
FSO/RF ad hoc network, the system switches to a reliable RF