taajuushyppy

Taajuushyppy, often translated as frequency hopping, is a spread spectrum communication technique. In this method, the carrier frequency of a radio signal is intentionally and rapidly changed (hopped) over a wide band of frequencies according to a pseudorandom sequence. This sequence is known to both the transmitter and receiver, allowing them to synchronize their frequency changes.

The primary advantage of taajuushyppy is its robustness against interference and jamming. By hopping frequencies, the signal is less susceptible to a narrow-band jammer, as the jammer would only disrupt a small portion of the communication. Similarly, it makes eavesdropping more difficult, as an unauthorized listener would need to track the rapid frequency changes.

Taajuushyppy is employed in various applications, including military communications, Bluetooth technology, and some Wi-Fi standards. It can be implemented in two main modes: slow frequency hopping, where each new frequency is used for a relatively long period, and fast frequency hopping, where the frequency changes occur very rapidly. The hopping pattern is determined by a pseudorandom number generator, which ensures the sequence appears random to an observer but is repeatable for the intended recipients. This technique contributes to secure and reliable wireless communication.