While you should support the publishers by buying the latest physical copy (which often includes updated problems and colored diagrams), a digital PDF copy serves as a lifesaver for quick searching, solving problems on a tablet, or referencing while traveling.
This makes the book slow to read but incredibly rewarding for deep learning. Note on Copyright & Ethics: The textbook is currently published by Dhanpat Rai & Co. (a leading Indian publishing house). While earlier editions (circa 2005-2010) are out of print, the latest edition is still commercially available.
A timeless text. Just ensure you pair it with a practical lab manual, because analog communication is best understood when you see the sine waves on an oscilloscope. Are you looking for specific solved problems from this book? Let me know the chapter number, and I can help break them down.