LDPC interleaver design for improved error floor performance

A method for wireless communications by a receiving device, comprising:

• demodulating a received signal corresponding to a coded bit sequence comprising interleaved systematic bits and parity bits;
• de-rate matching the coded bit sequence, wherein the de-rate matching comprises:
• de-interleaving the systematic bits and parity bits with a systematic bit priority mapping (SBPM) deinterleaver;
• and
• de-interleaving the parity bits with a partial deinterleaver;
• and
• decoding the deinterleaved systematic bits and parity bits using a low density parity check (LDPC) code to obtain one or more information bits.

An apparatus for wireless communications, comprising:

• means for encoding one or more information bits using a low density parity check (LDPC) code to produce a coded bit sequence comprising systematic bits and parity bits;
• means for storing the coded bit sequence;
• means for performing rate matching on the coded bit sequence, wherein the means rate matching comprises:
• means for partially interleaving the parity bits;
• and
• means for systematic bit priority mapping (SBPM) interleaving the systematic bits and the interleaved parity bits;
• means for mapping the SBPM interleaved bit sequence to constellation points according to a modulation scheme to produce a modulated bit sequence;
• and
• means for transmitting the modulated bit sequence.

An apparatus for wireless communications, comprising:

• means for demodulating a received signal corresponding to a coded bit sequence comprising interleaved systematic bits and parity bits;
• means for de-rate matching the coded bit sequence, wherein the means for de-rate matching comprises:
• means for systematic bit priority mapping (SBPM) de-interleaving the systematic bits and parity bits;
• and
• means for partially de-interleaving the parity bits;
• and
• means for decoding the deinterleaved systematic bits and parity bits using a low density parity check (LDPC) code to obtain one or more information bits.