Abstract
In FSO (Free-Space Optical) communications, performance of the communication systems is severely degraded by atmospheric turbulence. PPM (Pulse Position Modulation) is widely used in FSO communication systems owing to its high power effciency. In this paper, we present a combination of the BMST (Block Markov Superposition Transmission) technique and the PPM scheme to improve the reliability of the transmission over FSO links. Based on analyzing an equivalent system, a lower bound on the bit-error-rate of the proposed scheme is presented. Extensive simulations are performed which show that the BMST-PPM system performs well under a wide range of turbulence conditions and improves the performance of the basic code. Simulation results also show that, the performance of the system with the sliding-window detection/decoding algorithm matches well with the lower bound in the low-error-rate region.
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