Methods for the determination of FEC parameters in DMT based xDSL systems in the presence of system imposed constraints

A Discrete Multi-Tone (DMT) based Digital Subscriber Line (xDSL) system, the system comprising:

• a processor operable for determining Forward Error Correction (FEC) parameters, the processor comprising:
• a first algorithm operable for providing an initial value for each of R (number of check bytes), N (codeword size in bytes), and D (interleaver depth in bytes);
• a second algorithm operable for providing a set of constraints for one or more of maximum interleaver memory in bytes, maximum interleaver depth in bytes, maximum codeword size in bytes, maximum number of check bytes, maximum number of FEC codewords per DMT symbol, minimum number of DMT symbols for FEC correction, interleaver parameters, Signal-to-Noise ratio (SNR) profile, FEC coding gain, and framer parameters;
• and
• a third algorithm operable for determining a constrained value for each of R, N, and D based upon the set of constraints to maximize line rate for a given INPmin, wherein INPmin comprises the minimum number of DMT symbols for FEC correction;
• wherein the constrained value for each of R, N, and D is determined through computation based on the initial value of R, N, and D and the set of constraints without operational feedback.

A processor operable for determining Forward Error Correction (FEC) parameters, the processor comprising:

• a first algorithm operable for providing an initial value for each of R (number of check bytes), N (codeword size in bytes), and D (interleaver depth in bytes);
• a second algorithm operable for providing a set of constraints for one or more of maximum interleaver memory in bytes, maximum interleaver depth in bytes, maximum codeword size in bytes, maximum number of check bytes, maximum number of FEC codewords per DMT symbol, minimum number of DMT symbols for FEC correction, interleaver parameters, Signal-to-Noise ratio (SNR) profile, FEC coding gain, and framer parameters;
• and
• a third algorithm operable for determining a constrained value for each of R, N, and D based upon the set of constraints to maximize line rate for a given INPmin, wherein INPmin comprises the minimum number of DMT symbols for FEC correction, wherein the constrained value for each of R, N, and D is determined through computation based on the initial value of R, N, and D and the set of constraints without operational feedback.