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Advanced receiver design for AF-FD cooperative schemes.

Mohammad Al-Hattab¹, Hala Mostafa², Mohamed Marey³

¹College of Engineering, Al Ain University, 64141, Al Ain, UAE.

Scientific Reports

|May 23, 2026

Summary

This summary is machine-generated.

This study introduces an intentional delay in amplify-and-forward full-duplex (AF-FD) systems to improve reliability by creating diversity gain. Novel detection and estimation algorithms, including a Viterbi-based approach, effectively manage self-interference and enhance performance.

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Area of Science:

Wireless Communication
Signal Processing
Information Theory

Background:

Full-duplex (FD) systems enable simultaneous transmission and reception, but suffer from self-interference (SI).
Residual SI errors degrade the reliability of amplify-and-forward (AF) relaying systems.
Existing methods often struggle with complexity and latency in mitigating SI.

Purpose of the Study:

To enhance the reliability of AF-FD relaying systems using an intentional delay.
To develop novel detection and estimation algorithms for improved communication performance.
To analyze the error probability and performance bounds of the proposed techniques.

Main Methods:

An intentional delay is introduced at the relay to emulate convolutional coding and achieve diversity gain.
An optimal detection algorithm based on the Viterbi algorithm is designed to leverage interference.
A sub-optimal detector with reduced delay and a joint maximum-likelihood estimator are developed.
Analytical performance expressions for error probability are derived.

Main Results:

The proposed intentional delay effectively introduces diversity gain, enhancing system reliability.
The Viterbi-based optimal detector and the sub-optimal detector show superior performance in mitigating SI.
The joint maximum-likelihood estimator accurately recovers channel coefficients and delay.
Analytical results provide tight lower bounds for performance evaluation.

Conclusions:

The intentional delay strategy is effective in improving AF-FD system reliability against SI.
The developed Viterbi-based and sub-optimal detectors offer efficient solutions for SI mitigation.
The proposed estimators and analytical frameworks advance the understanding and design of FD systems.