Inter-Cell Interference Rejection Based on Ultrawideband Walsh-Domain Wireless Autoencoding

TL;DR

This paper introduces a novel Walsh-domain wireless autoencoder that effectively mitigates partial-in-band inter-cell interference in ultrawideband systems, enhancing signal quality amidst 5G interference.

Contribution

It presents an end-to-end autoencoder architecture leveraging Walsh functions for interference rejection, combining analytical modeling and experimental validation.

Findings

Achieves up to 12 dB ICI rejection

Maintains low block error rate under interference

Optimizes transmission parameters for maximum rejection

Abstract

This paper proposes a novel technique for rejecting partial-in-band inter-cell interference (ICI) in ultrawideband communication systems. We present the design of an end-to-end wireless autoencoder architecture that jointly optimizes the transmitter and receiver encoding/decoding in the Walsh domain to mitigate interference from coexisting narrower-band 5G base stations. By exploiting the orthogonality and self-inverse properties of Walsh functions, the system distributes and learns to encode bit-words across parallel Walsh branches. Through analytical modeling and simulation, we characterize how 5G CPOFDM interference maps into the Walsh domain and identify optimal ratios of transmission frequencies and sampling rate where the end-to-end autoencoder achieves the highest rejection. Experimental results show that the proposed autoencoder achieves up to 12 dB of ICI rejection while maintaining a low block error rate (BLER) for the same baseline channel noise, i.e., baseline Signal-to-Noise-Ratio (SNR) without the interference.