Περίληψη:
FSO communication is a viral technology among optical wireless
communications, gathering the interest of both researchers and
manufacturers. This is because of the many advantages associated with
FSO communication, including high data rates, reliability, safety, and
economy. However, there are several unavoidable drawbacks that shadow
the performance of FSO systems. For example, atmospheric turbulence is a
well-known problem related to the weather conditions of the channel,
which causes the scintillation effect. Also, spatial jitter due to
pointing errors is a critical factor of the link's performance, caused
by occasional misalignments between the transmitter and the receiver.
Moreover, time jitter is another limiting agent that deteriorates the
total throughput, inducing bit stream misdetections, caused by the
arrival of out-of-sync pulses. All three effects have been exhaustively
studied and many statistical models and interesting solutions have been
proposed in the literature to estimate their magnitude and compensate
for their impact. In this work, the turbulence effect was treated by
Malaga distribution, the spatial jitter effect was regulated by the
non-zero boresight model, and the time jitter effect was modeled by the
generalized Gaussian distribution. Various modulation schemes were
studied, along with DF multi-hop and optimal combining diversity
techniques at the receiver's end. New, accurate mathematical expressions
of average BER performance have been obtained, and valuable conclusions
were drawn thanks to the presented numerical results.
Συγγραφείς:
Gripeos, Panagiotis J.
Nistazakis, Hector E.
Tsigopoulos,
Andreas D.
Christofilakis, Vasilis
Roditi, Evgenia
