In a Digital Communication System, the messages generated by the source which are generally in analog form are converted to digital format and then transmitted. At the receiver end, the received digital data is converted back to analog form, which is an approximation of the original message

The most dangerous threat we―individually and as a society and country―face today is no longer military, but rather the increasingly pervasive exposure of our personal information; nothing undermines our freedom more than losing control of information about ourselves. And yet, as daily events underscore, we are ever more vulnerable to cyber-attack.

This book uses a practical approach in the application of theoretical concepts to digital communications in the design of software defined radio modems.