Taajuusvaihteluita

Taajuusvaihteluita, also known as frequency hopping, is a technique used in wireless communication systems to improve the security and reliability of data transmission. In frequency hopping, the transmitter and receiver change frequencies according to a predetermined pattern, known as a hopping sequence. This technique helps to minimize interference from other signals and reduces the likelihood of eavesdropping, as an attacker would need to follow the hopping pattern to intercept the communication.

Frequency hopping can be implemented in various ways, including fast frequency hopping (FFH) and slow frequency hopping (SFH). FFH changes frequencies multiple times per symbol, making it more resistant to interference but requiring more complex hardware. SFH, on the other hand, changes frequencies once per symbol, which is simpler to implement but less resistant to interference.

Frequency hopping is widely used in military and secure communication systems, as well as in some commercial applications such as Bluetooth and Wi-Fi. It is particularly useful in environments with high levels of interference or where security is a concern. However, frequency hopping can also introduce complexity and potential delays in communication, as the transmitter and receiver must synchronize their hopping sequences.