Abstract
In this letter, we focus on the performance analysis and code optimization of interleave-division multiple access (IDMA) with the rate-compatible low-density parity-check (LDPC) code adopted in 5G new radio (5G-NR) technical specification. By combining the multi-edge type density evolution (DE) and extrinsic information transfer (EXIT) analysis, a multi-edge-type DE-aided EXIT analysis is developed to analyze the asymptotic performance of 5G-NR LDPC-coded IDMA, which is shown to be fairly robust against the variations of user number. Then, the base matrix of 5G-NR LDPC code is optimized for IDMA to achieve higher sum spectral efficiency while maintaining the rate compatibility.
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