Textbooks:
Digital Communication - Proakis (https://arnabiitk.files.wordpress.com/2013/02/proakis-digital-communications-4th-ed.pdf)
Fundamental of Wireless Communication - David Tse (https://web.stanford.edu/~dntse/papers/book121004.pdf)
Wireless Communication - Gold Smith (http://web.stanford.edu/class/ee359/doc/WirelessComm_Chp1-16_March32020.pdf)