Abstract
High-speed data demand in sensitive locations has prompted new wireless technologies to grow in areas like hospitals for bio-sensor data transmission between doctors and patients. However, interference of electromagnetic spectrum or highly sensitive medical equipment in such locations can prevent radio waves which can further compromise the health of patients. Radio over Free Space Optics (Ro-FSO) can fulfil high-speed data demand in such locations without any such interference. However, the Ro-FSO performance is highly influenced by different adverse weather conditions, particularly haze and rainfall, which further cause attenuation in the transmission path of Ro-FSO systems. These atmospheric turbulences mainly affect the transmission link range of Ro-FSO systems. In this work, Ro-FSO system is designed by incorporating hybrid mode division multiplexing (MDM) and polarization division multiplexing (PDM) schemes to deliver four independent channels, each carrying 10 Gbps data upconverted to 40 GHz radio signal, over 3.4 km free space optical link operating under clear weather conditions. In addition to this, the proposed Ro-FSO link is subjected to different weather conditions, particularly partially hazy/rainy and dense fog/very rainy. The reported results indicate the achievement of acceptable bit error rate (BER≈10–3) for all channels up to 3400m FSO link under clear weather conditions, 1000m under partially haze/rain and 620 m under dense fog/heavy rain.
Highlights
The current pandemic situation of COVID-19 has affected global healthcare in general and raised questions on the effectiveness of epidemic response mechanisms across the world
Radio over Free Space Optical (Ro-Free Space Optics (FSO)) communication can be an excellent solution to fulfill the demands of high-speed data by combining radio technology with optical wireless technology at lower cost [10, 11]
Ro-FSO link is designed for transmission of broadband services by employing hybrid mode division multiplexing (MDM) and polarization division multiplexing (PDM) schemes
Summary
The current pandemic situation of COVID-19 has affected global healthcare in general and raised questions on the effectiveness of epidemic response mechanisms across the world. In 2019 [20], authors have proposed hybrid polarization division multiplexing (PDM) and OFDM schemes to transmit data over 5 km FSO link. Channel 2 and Channel 4 operated on donut mode 1 are slightly affected more as compared to Channel 1 and Channel 3 operated on donut mode 0 When the proposed Ro-FSO link is operated in clear weather conditions, the computed BER shows transmission of all the channels up to 3400 m FSO link with acceptable BER ≈10−3 and eye diagrams. When the proposed Ro-FSO link is operated in dense fog/heavy rain, the FSO transmission distance reduces to 620 m with acceptable BER and eye diagrams
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