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Real-Time Decoder Architecture for LDPC-CPM.

Erik Perrins1

  • 1Department of Electrical Engineering and Computer Science, University of Kansas, Lawrence, KS 66049, USA.

Entropy (Basel, Switzerland)
|March 28, 2025
PubMed
Summary
This summary is machine-generated.

This study analyzes iterative decoding for low-density parity check (LDPC) codes with continuous phase modulation (CPM), focusing on aeronautical telemetry. A new real-time decoder architecture offers a performance-complexity trade-off for LDPC-CPM systems.

Keywords:
channel codingconcatenated codingcontinuous phase modulation (CPM)iterative methodslow-density parity check (LDPC) code

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Area of Science:

  • Digital Communications
  • Coding Theory

Background:

  • Low-density parity check (LDPC) codes offer powerful error correction.
  • Continuous phase modulation (CPM) is used in aeronautical telemetry.
  • Concatenating LDPC codes with CPM presents unique decoding challenges.

Purpose of the Study:

  • To examine the iterative decoding performance of LDPC codes combined with CPM waveforms.
  • To analyze the decoding complexity of newly designed LDPC-CPM schemes for the IRIG-106 standard.
  • To develop and evaluate a real-time decoder architecture for LDPC-CPM systems.

Main Methods:

  • Comprehensive numerical simulations to characterize decoder performance and iteration statistics.
  • Development of a reference simulation for efficient system design exploration.
  • Design of a fixed-complexity, real-time decoder architecture.

Main Results:

  • Identified optimal decoder configurations for LDPC-CPM systems.
  • Exposed a design challenge related to the "peak to average" ratio in global iterations.
  • Demonstrated a trade-off between decoding latency and maximum global iterations in the real-time architecture.

Conclusions:

  • The proposed methodology accurately assesses LDPC-CPM system performance.
  • The real-time decoder architecture provides an attractive performance-complexity trade-off.
  • The developed techniques are broadly applicable to LDPC-based communication schemes.