Abstract
AbstractPolar codes are a type of forward error correction (FEC) codes that can achieve the capacity of a discrete memoryless symmetric channel. Polar codes are accepted by the 5G standard due to the excellent error correction performance. The next-generation mobile communication system requires higher spectrum efficiency, so it is significant to study the easy-to-implement and efficient coded modulation scheme of polar codes for high-order modulation. The commonly used polar coded modulation schemes in communication systems mainly include bit-interleaved coded modulation (BICM) and multilevel coding (MLC). Aiming at the requirements of higher spectrum efficiency and higher reliability of future communication systems, in this work, we propose an improved MLC scheme based on polar codes to reduce the difficulty of MLC scheme design. Since the quadrature amplitude modulation (QAM) can be decomposed into two orthogonal pulse amplitude modulation (PAM) in the MLC system, we performed simulations based on PAM in an additive white Gaussian noise (AWGN) channel. Compared with the conventional BICM scheme, the proposed MLC scheme provides performance gains of 0.4 dB and 1.48 dB under 8-PAM and 16-PAM, respectively. At the same time, while the proposed MLC scheme provides a large amount of performance gain at 16-PAM, the complexity of the soft-decision decoder of the entire system is reduced by 55%.KeywordsPolar codesBit-interleaved coded modulationMultilevel codingSignal point labelingHigh-order modulation
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