Deep-space Communications
Many modern modems have their origin in deep space telecommunications systems from the 1960s.
Differences between deep space telecom modems and landline modems include:
- Digital modulation formats that have high Doppler immunity are typically used.
- Waveform complexity tends to be low—typically binary phase shift keying.
- Error correction varies mission to mission, but is typically much stronger than most landline modems.
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