Feedback Approach for the Relay Channel with Noisy Feedback and Its Security Analysis

Area of Science:

• Wireless communication
• Information theory
• Coding theory

Background:

• Relay channels are crucial for sensor networks and satellite communication.
• Existing schemes for additive white Gaussian noise (AWGN) relay channels often assume noiseless feedback, limiting their applicability.
• Noisy feedback in relay channels significantly degrades communication performance.

Purpose of the Study:

• To propose an efficient coding scheme for AWGN relay channels with noisy feedback.
• To extend the proposed scheme to multi-input single-output (MISO) fading relay channels (FRC) with noisy feedback.
• To analyze the security performance of the developed coding schemes.

Main Methods:

• A lattice-based strategy is introduced to mitigate the impact of feedback channel noise in AWGN relay channels.
• Pre-coding is employed to transform MISO channels into single-input single-output (SISO) channels.
• A two-dimensional lattice coding strategy is applied to address feedback fading channel noise.

Main Results:

• The proposed lattice-based scheme effectively eliminates the impact of feedback noise in AWGN relay channels.
• The extended scheme successfully handles noisy feedback in MISO FRC by converting it to a SISO channel.
• Numerical examples validate the performance and security analysis of the proposed schemes.

Conclusions:

• The developed coding schemes offer efficient solutions for relay channels with noisy feedback, applicable to sensor networks and satellite communications.
• The lattice-based and pre-coding strategies provide robust performance in challenging communication environments.
• The research contributes to advancing secure and reliable wireless communication systems.