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Summary

Two novel non-coherent pulse-position modulation (PPM) receiver schemes improve performance and data rates. Absolute-value cubing and polarity-invariant squaring enhance signal processing for better energy efficiency in wireless communications.

Keywords:
Absolute-value cubingEnergy detectionPolarity-invariant squaringPulse position modulationUltra-widebandWeighted-transmitted reference

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Area of Science:

  • Electrical Engineering
  • Optical Communications
  • Signal Processing

Background:

  • Energy-detection (ED) pulse-position modulation (PPM) receivers suffer from low performance and data rates.
  • Coherent receivers offer better performance but are too complex for practical use.
  • Non-coherent PPM receivers require enhanced detection schemes for improved efficiency.

Purpose of the Study:

  • To propose and evaluate two novel non-coherent PPM receiver detection schemes.
  • To enhance the performance and data rates of PPM receivers in challenging communication environments.
  • To investigate the effectiveness of absolute-value cubing and polarity-invariant squaring in improving receiver performance.

Main Methods:

  • Implemented an absolute-value cubing (AVC) operation before demodulation in a non-coherent PPM receiver.
  • Utilized a weighted-transmitted reference (WTR) system for improved energy efficiency and rate.
  • Introduced a polarity-invariant squaring (PIS) operation within the WTR-PPM receiver structure.
  • Simulated receiver performance using binary PPM (BPPM) at 2.08 and 9.1 Mbps over in-vehicle channels with various interference types.

Main Results:

  • The AVC-BPPM receiver significantly outperforms the ED-based receiver without inter-symbol interference (ISI).
  • The WTR-BPPM system shows considerable performance gains over ED-BPPM, particularly at higher data rates.
  • The proposed PIS-based WTR-BPPM system demonstrates superior performance compared to the conventional WTR-BPPM system.
  • Both proposed schemes offer improved performance with acceptable complexity.

Conclusions:

  • The proposed AVC and PIS-based WTR schemes effectively enhance non-coherent PPM receiver performance.
  • These advanced detection methods provide a practical solution for improving data rates and energy efficiency in wireless systems.
  • The findings are particularly relevant for in-vehicle communication systems facing noise and interference challenges.