Frequenzhüpfen

Frequenzhüpfen, also known as frequency hopping, is a spread spectrum wireless communication technique. It involves rapidly changing the carrier frequency of a transmitted signal according to a pseudorandom sequence. This sequence is synchronized between the transmitter and receiver. The signal effectively "hops" from one frequency to another within a defined frequency band. The rate of hopping can vary, from tens to thousands of hops per second.

The primary advantage of frequency hopping is its robustness against interference. By spreading the signal across multiple frequencies, it becomes more resistant to narrowband jamming or interference that might affect a single frequency. If interference occurs on one frequency, the signal quickly moves to another, minimizing the impact. This also makes it harder to intercept the signal, as an eavesdropper would need to track the rapid frequency changes.

Frequency hopping is employed in various applications. It is notably used in Bluetooth technology, enabling multiple devices to communicate in the same environment without significant interference. It is also found in military radio systems for secure and jam-resistant communication, as well as in some Wi-Fi standards and other wireless protocols. The pseudorandom sequence used for hopping is key to both the security and interference mitigation aspects of the technology.