Systems, methods, and apparatus for pruned constellations

A method comprising:

• receiving modulated symbols;
• demodulating the modulated symbols based on a first constellation, to recover a plurality of input bits;
• and
• outputting the recovered plurality of input bits,
• wherein the first constellation comprises constellation points that are consistent with a portion of a second constellation, and
• the portion of the second constellation excludes a first subset of constellation points in the second constellation that are associated with lowest power and a second subset of constellation points in the second constellation that are associated with highest power.

An apparatus comprising:

• at least one processor;
• and
• memory coupled to the at least one processor, the memory storing instructions that, when executed by the at least one processor, cause the apparatus to:
• map input bits, based on a first constellation, to obtain a plurality of modulated symbols;
• and
• output the plurality of modulated symbols,
• wherein the first constellation comprises constellation points that are consistent with a portion of a second constellation, and
• the portion of the second constellation excludes a first subset of constellation points in the second constellation that are associated with lowest power and a second subset of constellation points in the second constellation that are associated with highest power.

An apparatus comprising:

• at least one processor;
• and
• memory coupled to the at least one processor, the memory storing instructions that, when executed by the at least one processor, cause the apparatus to:
• receive modulated symbols;
• demodulate the modulated symbols based on a first constellation, to recover a plurality of input bits;
• and
• output the recovered plurality of input bits,
• wherein the first constellation comprises constellation points that are consistent with a portion of a second constellation, and
• the portion of the second constellation excludes a first subset of constellation points in the second constellation that are associated with lowest power and a second subset of constellation points in the second constellation that are associated with highest power.