Gupta, Minal, and Amit Mahal. “Comparison of BER and Bandwidth of OOK, PPM, PAM and BPSK for FSO Communication”. Universal Research Reports 4, no. 4 (September 30, 2017): 23–26. Accessed November 22, 2024. https://urr.shodhsagar.com/index.php/j/article/view/142.