Performance Enhancement of M-ary DPPM Bit Error Rate in FSO Systems with Aperture Averaging Under Crosstalk, Pointing Error, and ASE Noise Conditions
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Abstract
The evaluation of the performance of a communication system based on free-space optical (FSO) technology using digital pulse position modulation (DPPM) and on-off keying non-return-to-zero (OOK-NRZ) technique is explored within this study. This research delves into the effects of atmospheric turbulence, scintillation, and amplified spontaneous emission (ASE) noise. In order to mitigate the impact of turbulence-induced scintillation and optical power loss, the utilization of aperture averaging is suggested. The assessment of bit-error rate (BER) performance under atmospheric turbulence and ASE noise is detailed, employing moment generation function techniques in conjunction with a modified Chernoff bound for enhanced accuracy compared to the conventional Chernoff bound. This system shows potential for providing power-efficient, cost-effective, highly flexible, and reliable solutions for future access networks catered towards higher data rates. BER results are presented for an optically preamplified DPPM FSO communication system affected by pointing errors, atmospheric turbulence, and ASE noise from optical amplification. The use of a gamma-gamma distribution model enables the characterization of various turbulence conditions. The findings showcase the superiority of DPPM in terms of enhanced receiver sensitivity, with an improvement of approximately 10 dB – 11 dB over an equivalent optically preamplified OOK-NRZ approach at a binary data rate of 2.5 Gbps and a typical FSO BER of ), contingent on the turbulence levels.
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