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Multiple input multiple output (MIMO) technique with equal gain combining (EGC) is considered in this work to enhance the data rate of free-space optical communication (FSO) system in log-normal channel. In FSO system, light propagating in free space is used to transmit data for communication system. 256-ary pulse position modulation (PPM) using intensity modulation with direct detection (IM/DD) as...
In this paper, we have shown the advantage of using 4-ary pulse position modulation (PPM) using intensity modulation with direct detection (IM/DD) as a power efficient system over coherent differential phase shift keying (DPSK) as a bandwidth efficient system in free space optical (FSO) weak turbulence channel (log-normal channel) and strong turbulence channel (negative-exponential channel). The comparison...
In the above titled paper (ibid., vol. 53, no. 9, pp. 1455-1461, Sep. 2005), the probability of error was computed for APD receivers. Due to an unintentional error, the square-root was omitted from the expression for the error rates in Eqs. (13) and (20). The correct expressions are presented here, as well as corrected Figs. 1-4.
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