[1]   Leon W. Couch II. Digital and Analog Communication Systems. Prentice Hall, 1997.

[2]   Edward A. Lee and David G. Messerschmitt. Digital Communication. Kluwer Academic Publishers, 101 Philip Drive, Assipi Park, Norwell, MA 02061, USA, 1988.

[3]   R. E. Ziemmer and W. H. Tranter. Principles of Communications - Systems, Modulation and Noise. Houghton Mifflin, 222 Berkeley Street,Boston, USA, fourth edition, 1988.