Fixed-length probabilistic amplitude shaping

A wireless communication device comprising:

• at least one modem;
• at least one processor communicatively coupled with the at least one modem;
• and
• at least one memory communicatively coupled with the at least one processor and storing processor-readable code that, when executed by the at least one processor in conjunction with the at least one modem, is configured to:
• obtain a first information block that includes a fixed number (N1) of information bits;
• perform a first encoding operation on one or more of the information bits that produces a number (LS) of amplitude-shaped bits;
• arrange the LS amplitude-shaped bits into a second information block that includes a number (LUS) of the information bits from the first information block, the sum of LS and LUS being less than or equal to a fixed amount (N2);
• selectively add one or more padding bits to the second information block so that a length of the second information block is equal to N2;
• add, to the second information block, one or more signaling bits indicating the number of amplitude-shaped bits in the second information block;
• perform a second encoding operation on the second information block that produces one or more codewords, each codeword including a respective subset of bits of the second information block and one or more parity bits resulting from the second encoding operation;
• arrange the subsets of bits of the second information block and the parity bits into a plurality of symbols, each symbol having an amplitude based on the respective bits arranged in the symbol, the first encoding operation producing the amplitude-shaped bits so that the amplitudes of the plurality of symbols have a non-uniform distribution;
• and
• transmit a wireless packet, including the plurality of symbols, to at least one receiving device.

A method for wireless communication by a wireless communication device, comprising:

• receiving a wireless packet including a plurality of symbols having a plurality of amplitudes, the plurality of symbols representing a plurality of codeword bits, the plurality of amplitudes having a non-uniform distribution;
• arranging the plurality of codeword bits into one or more codewords;
• performing a first decoding operation on the one or more codewords that produces one or more respective decoded code blocks, each decoded code block including a plurality of decoded codeword bits and one or more parity bits;
• arranging the pluralities of decoded codeword bits into an information block having a fixed length (N2);
• detecting one or more signaling bits of the information block based on the fixed length N2 of the information block;
• identifying a number (LS) of amplitude-shaped bits in the information block based on a value associated with the one or more signaling bits;
• performing a second decoding operation on the amplitude-shaped bits that produces a number (LDS) of de-shaped bits;
• parsing a number (LUS) of unshaped bits from the information block based on the number LDS of de-shaped bits and a fixed length (N1) associated with a decoded information block;
• and
• arranging the de-shaped bits and the unshaped bits into the decoded information block having the fixed length N1.

A wireless communication device comprising:

• at least one modem;
• at least one processor communicatively coupled with the at least one modem;
• and
• at least one memory communicatively coupled with the at least one processor and storing processor-readable code that, when executed by the at least one processor in conjunction with the at least one modem, is configured to:
• receive a wireless packet including a plurality of symbols having a plurality of amplitudes, the plurality of symbols representing a plurality of codeword bits, the plurality of amplitudes having a non-uniform distribution;
• arrange the plurality of codeword bits into one or more codewords;
• perform a first decoding operation on the one or more codewords that produces one or more respective decoded code blocks, each decoded code block including a plurality of decoded codeword bits and one or more parity bits;
• arrange the pluralities of decoded codeword bits into an information block having a fixed length (N2);
• detect one or more signaling bits of the information block based on the fixed length N2 of the information block;
• identify a number (LS) of amplitude-shaped bits in the information block based on a value associated with the one or more signaling bits;
• perform a second decoding operation on the amplitude-shaped bits that produces a number (LDS) of de-shaped bits;
• parse a number (LUS) of unshaped bits from the information block based on the number LDS of de-shaped bits and a fixed length (N1) associated with a decoded information block;
• and
• arrange the de-shaped bits and the unshaped bits into the decoded information block having the fixed length N1.