Simplified system and method for bit-interleaved coded modulation with iterative decoding (bicm-id)

A receiver for receiving and processing bit-interleaved coded modulation (BICM) signals from a BICM transmitter to generate information bit estimates of information in the BICM signals, 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), and
• the decoder is configured to generate the information bit estimates based on the first symbol APPs output from the symbol APP generator.