Performance of OOK and Variants of PPM in APD based Free Space Optical Communication Systems
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چکیده
On-Off Keying (OOK) and Pulse Position Modulation (PPM) are the most commonly used modulation techniques in Free Space Optical (FSO) communications. In this paper, the performance of an FSO system with OOK and various PPM schemes has been analysed. The log-normal turbulence model for weak atmospheric turbulence and Avalanche Photo Diode (APD) receiver are considered for the system performance evaluation. The bit-error-rate (BER) performance for various schemes have been analysed and compared graphically. It was found that the performance of Differential Amplitude Pulse Position Modulation (DAPPM) is better than that of other schemes for the same peak power.
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تاریخ انتشار 2013