Low Density Parity Codes (LDPC) (1). So good forward error correction that up toa few years ago it was all under patents. Gold Codes (2) are also very cool in

Low Density Parity Codes (LDPC) (1). So good forward error correction that up toa few years ago it was all under patents. Gold Codes (2) are also very cool in CDMA systems. [1] https://en.m.wikipedia.org/wiki/Low-density_parity-check_code https://en.m.wikipedia.org/wiki/Low-density_parity-check_cod... [2] https://en.m.wikipedia.org/wiki/Gold_code https://en.m.wikipedia.org/wiki/Gold_code