Non-Line-of-Sight Ultraviolet Communication With Receiver Diversity in Atmospheric Turbulence

Optical Camera Communications: Principles, Modulations, Potential and Challenges

“…The channel impulse response for the LOS link can be represented as a matrix H ch = [h ch,u,v ] U×V , where U and V are the numbers of rows and columns of the image sensor, respectively and h ch,u,v is the channel impulse response of the (u, v)-th pixel. Using a single LED and a Gaussian mixture model, h ch,u,v is estimated as [6]:…”

“…OWC covers the entire optical spectrum of ultraviolet (UV), visible and infrared (IR) [1,2], see Figure 1, thus offering a massive theoretical bandwidth of 20 THz (IR), 320 THz (visible) and 30 PHz (UV) compared with the bandwidth of 300 GHz in the RF technology [1,3,4]. Within the OWC umbrella, there are a number of transmission schemes for both indoor and outdoor environments including infrared communications (IRC), free space optics (FSO), visible light communications (VLC) and ultraviolet communications (UVC) [1,[3][4][5][6], as shown in Figure 2. The VLC and IRC are generally considered for short-range indoor applications, while FSO (using the IR band) and UVC (using the C band) are predominantly employed for medium-long range outdoor environments.…”

Outage analysis of MIMO NLOS‐UV communication systems over atmospheric turbulence channels

“…Spatial diversity techniques provide an appealing alternative approach for fading compensation with their inherent redundancy, which has been extensively studied in the context of RF and IR wireless networks [17, 18]. The number of articles that addressed the deployment of spatial diversity in NLOS‐UV communication systems is somewhat limited [13, 14, 19–27]. El‐Shimy and Hranilovic investigated spatial diversity imaging receivers for NLOS‐UV links with consideration of path loss and delay spread.…”

“…conducted the experimental research on 14 real‐time SIMO diversity reception for NLOS‐UV links [20]. Arya and Chung have proposed the spatial diversity reception of NLOS‐UV communication in turbulent atmospheric channels [21]. They considered receive diversity over correlated Gamma‐Gamma distributed channels and investigated the outage probability and the symbol error rate of single‐input‐multiple‐output (SIMO) systems.…”

ANN-Assisted Real-Time Blind Signal Detection Over Time-Varying Doubly-Stochastic Poisson Channel for Indoor Optical Wireless Communications

“…OWC relies on light intensity to convey data, with frequencies ranging from ultraviolet (UV) to visible light to infrared. Compared to radio frequency communication links, OWC offers a secure connection with a wide free spectrum range, high spectral efficiency, low-power operation, and miniaturized transceiver circuits [1], [2].…”