What technique reduces distortion in a transmission system by generating intentional distortion at the transmit end?

The correct answer is predistortion. This technique is utilized in transmission systems to counteract the effects of distortion that occur during signal transmission. By intentionally introducing a controlled amount of distortion at the transmit end, the signal can be shaped in a way that compensates for the nonlinearities present in the transmission medium.

When the signal experiences its journey through the transmission system, the intentional distortion created by predistortion counteracts the unwanted distortions that might be introduced by the system itself, resulting in a clearer, more accurate signal at the receiver end. This proactive measure helps maintain the integrity of the transmitted information, making it a valuable technique in various communication applications, especially in systems where signal fidelity is critical.

In contrast, other options like post distortion and filtering refer to modifying signals after transmission or applying different techniques that do not provide the same proactive benefits of compensating for distortion at the source. Scanning generally pertains to sampling or searching for signals rather than addressing distortion management within transmission systems.