Free Download Contemporary Communication Systems Using MATLAB… By John G. Proakis, Masoud Salehi, Gerhard Bauch Publisher Cengage Learning 2013 ISBN..
Free Download Digital Signal Processing Using MATLAB… By Vinay K. Ingle, John G. Proakis Publisher Cengage Learning 2011 ISBN 1-111-42737-2,978-1-111-42737-5..