Frequency change refers to the process of shifting the carrier frequency of a communication signal from one value to another. In wireless communication systems, frequency changes can occur for various reasons, including:
- Frequency Hopping: In frequency hopping spread spectrum (FHSS) systems, the carrier frequency changes rapidly according to a predefined hopping sequence. This technique is used to improve signal robustness against interference and fading.
- Channel Switching: In wireless networks like Wi-Fi, devices can switch to different channels (frequency bands) to avoid congestion and interference.
- Adaptive Modulation: Wireless systems may change the carrier frequency based on the modulation scheme used, adjusting it for optimal performance under varying conditions.
- Handoff or Handover: In cellular networks, mobile devices change their frequency channel when moving between different cells to maintain a continuous connection.
- Frequency Planning: Network operators may change the frequency assignments of different cells to optimize coverage and minimize interference.
- Avoiding Interference: If there’s interference on a specific frequency, devices may switch to a different frequency to maintain signal quality.
Frequency changes can be managed automatically by communication protocols, devices, and network infrastructure to ensure reliable and efficient wireless communication.