Topic: Communication Systems
In satellite communication, scrambling is mainly used for
- A. clock recovery
- B. encryption
- C. limiting power spectral density
- D. bandwidth efficiency
Answer: C. limiting power spectral density
Explanation: In satellite communications, data scrambling is employed to randomize the bitstream. This prevents long strings of 1s or 0s, thereby limiting the concentrated power spectral density (preventing sharp spectral peaks) and ensuring energy is spread evenly, which mitigates interference with adjacent channels.