Joint Semi-Blind Self-Interference Cancellation and Equalisation Processes in 5G QC-LDPC-Encoded Short-Packet...

Area of Science:

• Wireless Communications
• Signal Processing
• Information Theory

Background:

• Full-Duplex (FD) transmissions enable simultaneous data transmission and reception, enhancing spectral efficiency.
• Short-packet transmissions are crucial for low-latency applications like 5G and IoT, but pose challenges for channel estimation.
• Self-interference cancellation and accurate channel estimation are critical for FD system performance.

Purpose of the Study:

• To develop a joint semi-blind algorithm for self-interference cancellation and channel estimation in 5G QC-LDPC encoded short-packet FD transmissions.
• To address the challenges of channel estimation in short-packet transmissions by minimizing pilot symbol overhead.
• To evaluate the performance, processing time, and computational complexity of the proposed algorithm.

Main Methods:

• A joint semi-blind iterative algorithm was proposed, integrating a minimal number of pilot symbols (at least four) with the information sequence.
• The algorithm utilizes a feedback loop for channel estimation, accounting for the characteristics of short-packet transmissions.
• Performance was evaluated based on Mean-Squared Error (MSE) and Bit Error Rate (BER).

Main Results:

• The proposed semi-blind algorithm achieved near-optimal performance in 5G FD transmissions.
• Significant reductions in processing time and computational complexity were observed compared to existing methods.
• Improvements in Mean-Squared Error (MSE) and Bit Error Rate (BER) were demonstrated.

Conclusions:

• The joint semi-blind iterative algorithm offers an efficient solution for self-interference cancellation and channel estimation in 5G and Beyond FD systems.
• The algorithm shows significant potential for practical IoT transmission scenarios requiring low latency and high reliability.
• This approach effectively balances performance, complexity, and overhead for short-packet FD communications.