Encoding
The Space Network (used for near-Earth communications) supports the following encoding schemes:
- BPSK
- QPSK/SQPSK
- 8PSK
- Rate 1/2 convolutional coding
- SQPN
- PRN coding - used to reduce power spectral density for low bit rate signals, and for time transfer.
The Reed-Solomon method is used as the initial error-correcting block code prior to the selected secondary encoding scheme.
Read more about this topic: Space Communications And Navigation Program, Communications Schemes