Simplified Soft Demapping Algorithm for Gray-APSK

  • HUANG Jiachen
    Department of Electronic Engineering, Tsinghua National Laboratory of Information Science and Technology (TNList), Tsinghua University
  • PAN Changyong
    Department of Electronic Engineering, Tsinghua National Laboratory of Information Science and Technology (TNList), Tsinghua University
  • PENG Kewu
    Department of Electronic Engineering, Tsinghua National Laboratory of Information Science and Technology (TNList), Tsinghua University
  • FAN Liwen
    Department of Electronic Engineering, Tsinghua National Laboratory of Information Science and Technology (TNList), Tsinghua University
  • SONG Jian
    Department of Electronic Engineering, Tsinghua National Laboratory of Information Science and Technology (TNList), Tsinghua University

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Description

Amplitude phase shift keying (APSK) constellation with Gray mapping was proposed recently. Inspired by the simplified soft demapping for regular Gray-QAM, a simplified soft demapping algorithm for Gray-APSK is proposed in this paper. Compared with conventional soft demapping schemes, its complexity is greatly reduced with only a little SNR loss, which is validated by the complexity analysis and FPGA compilation results.

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