US 12,341,610 B2
Simplified system and method for bit-interleaved coded modulation with iterative decoding (BICM-ID)
Liping Chen, Bethesda, MD (US); Rohit Iyer Seshadri, Gaithersburg, MD (US); Neal David Becker, Olney, MD (US); and Mustafa Eroz, Rockville, MD (US)
Assigned to Hughes Network Systems, LLC, Germantown, MD (US)
Filed by Hughes Network Systems, LLC, Germantown, MD (US)
Filed on Aug. 7, 2023, as Appl. No. 18/366,318.
Prior Publication US 2025/0055598 A1, Feb. 13, 2025
Int. Cl. H04L 1/00 (2006.01); H03M 13/11 (2006.01); H03M 13/37 (2006.01)
CPC H04L 1/0071 (2013.01) [H03M 13/1125 (2013.01); H03M 13/3784 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A receiver in a receiver-based interference cancellation satellite system, including a bit-interleaved coded modulation (BICM) transmitter for transmitting signals to the receiver over a satellite link, for receiving and processing bit-interleaved coded modulation (BICM) signals from the BICM transmitter to generate information bit estimates of information in the BICM signals to improve power efficiency of the satellite link, the receiver comprising:
a decoder configured to generate the information bit estimates of the information in the received BICM signals;
a symbol a posteriori probability (APP) generator configured to generate first symbol a posteriori probabilities (APPs) by processing the BICM signals based on Euclidean distances computed only for a quadrant to which received symbols derived from the BICM signals belong, and further based on symbol probability log-likelihood ratios (SPLLRs) provided to the symbol APP generator by an extrinsic-information-based symbol probability log-likelihood ratio (SPLLR) generator,
wherein:
the extrinsic-information-based SPLLR generator is configured to generate the SPLLRs directly from extrinsic information based on updated symbol APPs output from the decoder, without converting the extrinsic information into log-likelihoods (LLs),
the decoder is configured to generate the information bit estimates based on the first symbol APPs output from the symbol APP generator,
the receiver further comprises a bit-LLR soft decision generator configured to receive the first symbol APPs, and to generate simplified bit-LLR soft decisions to provide to the decoder based on the first symbol APPs received from the symbol APP generator, and
the bit-LLR soft decision generator is configured to calculate the simplified bit-LLR soft decisions using the SPLLRs to improve the power efficiency of the satellite link with the simplified bit-LLR soft decisions.