Abstract
Free-space communication (FSOC) system has been receiving considerable interest in recent years due to the inherent advantages they have over traditional radio frequency communication systems. In this research paper, a high-speed, OFDM-based FSOC transceiver system is proposed. A digital signal processing algorithm based on coherent receivers is incorporated to minimize the receiver complexity and, hence, the overall system cost. A combined mathematical channel model, comprised of the two independent FSOC channel impairments: link loss and atmospheric turbulence, is also proposed to investigate this system’s performance. The FSOC transceiver link is evaluated for different higher-order M-QAM modulation schemes with respect to electrical signal to noise ratio (SNR) requirements for the threshold BER FEC limit of 3 × 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-3</sup> under strong atmospheric turbulence conditions. This proposed low-cost, high-speed system shall be useful in a robust short transmission link under dynamic atmospheric conditions.
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