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Early-detection scheme based on sequential tests for low-latency communications
Diego Barragán-Guerrero1,2, Minh Au3, Ghyslain Gagnon1
1Department of Electrical Engineering, École de technologie supérieure, Montréal, H3C 1K3 QC Canada.
EURASIP Journal on Wireless Communications and Networking
|March 27, 2023
Summary
This study introduces an early-detection scheme to cut communication latency using sequential tests without feedback. The method achieves optimal low-latency strategies for various communication systems, including multi-hop and multi-carrier transmissions.
Area of Science:
- Information Theory
- Digital Communications
- Signal Processing
Background:
- Reducing communication latency is crucial for real-time applications.
- Existing methods often rely on feedback channels, increasing latency.
- Finite blocklength regimes present unique challenges for efficient communication.
Purpose of the Study:
- To propose an early-detection scheme for reducing communication latency.
- To analyze the scheme's performance in additive white Gaussian noise (AWGN) channels.
- To demonstrate its effectiveness in various communication scenarios.
Main Methods:
- Sequential observation processing for symbol decision-making.
- Analysis of optimal achievable latency under finite blocklength constraints.
- Application of random coding and pre-coding techniques for band-limited signals.
Main Results:
- Optimal achievable latency was determined for AWGN channels.
- Demonstrated significant latency reduction (e.g., of symbol time for specific parameters).
- Proved the existence of optimal low-latency strategies for parallel Gaussian channels and multi-carrier modulation.
Conclusions:
- The proposed early-detection scheme effectively reduces communication latency.
- The scheme is adaptable to band-limited orthogonal frequency-division multiplexing (OFDM) signals.
- It shows promise for improving performance in multi-hop communication systems.
