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Unitary Space-Time Modulation Based on Coherent Codes.

Daniel Calabuig1

  • 1Instituto de Telecomunicaciones y Aplicaciones Multimedia (iTEAM), Universitat Politècnica de València, 46022 Valencia, Spain.

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|December 11, 2022
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Summary

This study introduces a novel method to convert pilot symbol-assisted modulation (PSAM) to unitary space-time modulation (USTM) and vice versa. This facilitates efficient construction and decoding of capacity-achieving USTM for high data rates.

Keywords:
constellation designnoncoherent multiple input–multiple-output (MIMO) communicationpilot symbol-assisted modulation

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Area of Science:

  • Wireless communication
  • Information theory
  • Signal processing

Background:

  • Unitary space-time modulation (USTM) is capacity-achieving but often computationally expensive to construct.
  • Existing USTM methods lack structured constellations, complicating decoding processes.
  • Pilot symbol-assisted modulation (PSAM) offers a practical alternative, but USTM promises superior performance.

Purpose of the Study:

  • To establish a clear relationship and transformation map between PSAM and USTM.
  • To develop computationally feasible and efficiently decodable USTM constructions.
  • To achieve USTM performance comparable to PSAM, especially at high data rates.

Main Methods:

  • Developing a transformation map between PSAM and USTM constellations.
  • Utilizing a graphical representation of constellations to guide USTM construction.
  • Proposing new USTM construction algorithms based on the PSAM-USTM relationship.

Main Results:

  • A demonstrated method to convert between PSAM and USTM.
  • New USTM construction techniques that are computationally feasible.
  • USTM constellations with improved performance and simplified decoding compared to prior methods.

Conclusions:

  • The established PSAM-USTM relationship enables practical USTM implementations.
  • The proposed methods offer a balance between performance and computational complexity.
  • This work paves the way for efficient, high-performance USTM in advanced wireless systems.