@book{6601,
	author = { Proakis, John G and Salehi, Masoud},
	title = {Fundamentals of Communication Systems.},
	publisher = {Pearson,},
	year = {2005.},
	address = {London :},
	url = {https://books.google.com.pk/books/about/Fundamentals_of_Communication_Systems.html?id=B3HyAAAAMAAJ&source=kp_book_description&redir_esc=y}
}