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Improving Polar-Coded SCMA System by Information Coupling and Parity Check.

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|December 1, 2020
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Summary

A new information-coupled polar-coded sparse code multiple access (PC-SCMA) system enhances performance. This partially information-coupled (PIC) PCCA-polar coded system offers improved efficiency and reduced complexity for wireless communications.

Keywords:
extrinsic information transferparity checkpartially information couplingpolar codesparse code multiple accesssuccessive cancellation list

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Area of Science:

  • Wireless Communication Systems
  • Coding Theory
  • Signal Processing

Background:

  • Sparse Code Multiple Access (SCMA) systems are crucial for future wireless networks.
  • Polar codes offer good error correction performance but require efficient decoding methods.
  • Existing SCMA systems face challenges in balancing performance and complexity.

Purpose of the Study:

  • To propose a novel uplink information-coupled polar-coded SCMA (PC-SCMA) system.
  • To design and optimize a partially information-coupled (PIC) PCCA-polar code for SCMA.
  • To develop an advanced iterative detection and successive cancellation list (SCL)-decoding receiver.

Main Methods:

  • Design of a systematic joint parity check and CRC-aided (PCCA) polar code.
  • Construction of a partially information-coupled (PIC) polar code based on PCCA-polar code.
  • Development of a joint iterative detection and SCL-decoding receiver utilizing Bayes rule and Soft Cancellation (SCAN) algorithm.
  • Optimization of the PIC PCCA-polar code using the Extrinsic Information Transfer (EXIT) chart concept.

Main Results:

  • The proposed PIC PCCA-PC-SCMA system demonstrates superior performance compared to existing polar or LDPC coded SCMA systems across various code rates and channel conditions.
  • The system achieves reduced computational complexity at high Eb/N0 compared to uncoupled PC-SCMA systems with SCL decoders.
  • Simulation results validate the effectiveness of the proposed coding and decoding scheme.

Conclusions:

  • The developed information-coupled polar-coded SCMA system offers significant performance gains.
  • The PIC PCCA-polar code and joint iterative SCL-decoding receiver effectively improve SCMA system efficiency.
  • This research contributes a promising solution for advanced wireless communication systems demanding high data rates and reliability.