'The transmitter' (Telecommunications, 2017), 'Transceiver and System Design for Digital Communications, 5th Edition', Chap. 2, pp. 35-94, DOI: 10.1049/PBTE080E_ch2
IET Digital Library, https://digital-library.theiet.org/;jsessionid=mtwdbvr6wpiw.x-iet-live-01content/books/10.1049/pbte080e_ch2