'MIMO transmission' (Telecommunications, 2017), 'Introduction to Digital Wireless Communications', Chap. 10, pp. 209-227, DOI: 10.1049/PBTE072E_ch10
IET Digital Library, https://digital-library.theiet.org/;jsessionid=45jhvt1rbis12.x-iet-live-01content/books/10.1049/pbte072e_ch10