What capability allows receivers to improve performance when competing signals are present?

Selectivity is the capability that allows receivers to improve performance in the presence of competing signals. It refers to the receiver's ability to differentiate between a desired signal and unwanted signals or noise. A highly selective receiver can effectively filter out or ignore signals that do not match the frequency or characteristics of the intended transmission, thereby enhancing clarity and quality of the desired signal. This is crucial in environments where multiple signals may be present, as it ensures that the receiver can focus on the specific channel of interest, reducing interference from others.

To elaborate, selectivity is essential in radio communication, where multiple stations might operate on nearby frequencies. A receiver with good selectivity will have a tighter bandwidth, allowing it to isolate the desired signal from others that are close in frequency, leading to better overall reception and data integrity. This capability is fundamental to the performance of many communication systems, especially in a crowded frequency spectrum.