[1] Proakis J.G. - Digital Communications - McGraw Hill (2004)
[2] Multi-carrier Digital Communications-Theory and applications of OFDM - Bahai, Saltzberg & Ergen - Springer (2004)
[3] Digital Communication - Barry, Lee & Masserschmitt - Kluwer Academic Publishers (2004)
[4] Principles of digital transmissions, Ezio Bliglieri