'Cognitive systems' (Telecommunications, 2017), 'Transceiver and System Design for Digital Communications, 5th Edition', Chap. 9, pp. 261-301, DOI: 10.1049/PBTE080E_ch9 IET Digital Library, https://digital-library.theiet.org/;jsessionid=o57xzeqvlsb6.x-iet-live-01content/books/10.1049/pbte080e_ch9