Mohammed R. Abaza

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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(More)
Atmospheric turbulence induced fading is one of the main impairments affecting the operation of free-space optical (FSO) communication systems. In this paper, the bit error rate (BER) of M-ary pulse position modulation (M-ary PPM) of directdetection and avalanche photodiode (APD) based is analyzed. Both log-normal and negative exponential fading channels(More)
(20) Subsequently, numerical results depicted in Figs. 1-4 of the paper must be corrected. The corrected figures are shown on this page and the following page. Finally, the last line in page 1459 to the third line in page 1460 of ref. [1], which states that “140 photons when σ sc =0.2 will require an average signal level of approximately 260 when σ sc =0.2(More)
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