Performance Analysis of M-ary DPSK with SIMO in Ground-to-HAP FSO System in the Presence of Beam Wander and Scintillation

Studying the performance of communication systems is essential to establish a reliable and stable link with an acceptable quality of service and minimum amount of resources. This paper evaluates the ground to HAP FSO link that uses the M-ary differential phase-shift keying (MDPSK) modulation technique in the presence of turbulence and beams wandering. The performance is analyzed by comparing the Average Symbol Error Rate (ASER) with an applicable threshold of 10-4. The results confirmed that, when limiting the transmitted power to 33 dBm, which is consistent with a practical perspective, the ASER is below the threshold only at a constellation size of 4. Therefore, a single input multiple output (SIMO) technique is introduced to improve the performance. The channel capacity is also shown to demonstrate the benefit of increasing the constellation size. © 2022 IEEE.