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Free Space Optics (FSO) is a promising solution for the need to very high data rate point-to point communication. It is one of the future technologies of wireless networks as it meets most of the quality parameters at low implementation cost. The main drawback in communicating via the FSO channel is the detrimental effect the atmosphere has on a propagating laser beam. This paper investigates the use of multiple lasers and multiple apertures to mitigate the effects of the atmospheric turbulence without and with Low Density Parity Check (LDPC) code. Here an analytical approach is presented to evaluate the bit error rate performance of a free space optical link using LDPC coded Q-ary optical PPM through atmospheric turbulence channel.
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