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Summary
This summary is machine-generated.

This study introduces adaptive bit-labeling for joint source-channel coded modulation (JSCCM) systems to improve probabilistic amplitude shaping (PAS). The new method offers a low-complexity way to achieve shaping gain for varying source probabilities, enhancing bit-error rate (BER) performance.

Keywords:
bit labelingjoint source-channel coded modulationprotograph LDPC codesquadrature amplitude modulation (QAM)

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Area of Science:

  • Digital Communications
  • Information Theory
  • Signal Processing

Background:

  • Probabilistic amplitude shaping (PAS) is crucial for efficient data transmission.
  • Joint source-channel coded modulation (JSCCM) offers shaping gain but requires specific code design for fixed source probabilities.
  • Dynamic changes in source probabilities pose challenges for conventional JSCCM systems.

Purpose of the Study:

  • To propose a novel shaping scheme for JSCCM systems that accommodates dynamically changing source probabilities.
  • To enhance the shaping gain and bit-error rate (BER) performance of JSCCM systems without redesigning source and channel codes.
  • To offer a low-complexity alternative for achieving optimal PAS performance with varying source statistics.

Main Methods:

  • Optimizing bit-labeling within the JSCCM framework.
  • Developing adaptive bit-labeling strategies based on source probability and source code.
  • Evaluating the performance improvement through numerical simulations.

Main Results:

  • The proposed adaptive bit-labeling significantly improves the BER performance of JSCCM systems.
  • The new scheme effectively achieves shaping gain even with fluctuating source probabilities.
  • Switching between different labelings is simple and efficient for different source probabilities.

Conclusions:

  • Adaptive bit-labeling is a promising low-complexity approach for optimizing PAS in JSCCM systems.
  • This method provides a flexible solution for systems dealing with variable source probabilities.
  • The proposed technique offers a practical enhancement for achieving better communication efficiency and reliability.