Modem - Deep-space Communications

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.