An Anti-Interference AFDM System: Interference Impacts Analyses and Parameter Optimization

TL;DR

This paper introduces an anti-interference AFDM system that uses analytical interference modeling and parameter optimization to enhance reliability and throughput in high-mobility scenarios with malicious interference.

Contribution

It develops a novel anti-interference AFDM system with closed-form interference expressions, a parameter optimization algorithm, and a low-complexity detector for high throughput under malicious interference.

Findings

Closed-form interference expressions accurately model interference impacts.

Optimized parameters significantly improve packet throughput.

The proposed detector achieves full diversity gain and high reliability.

Abstract

This paper proposes an anti-interference affine frequency division multiplexing (AFDM) system to ensure reliability and resource efficiency under malicious high-power interference originating from adversarial devices in high-mobility scenarios. Closed-form expressions of interferences in the discrete affine Fourier transform (DAFT) domain are derived by utilizing the stationary phase principle and the Affine Fourier transform convolution theorem, which indicates that interference impacts can be classified into stationary and non-stationary categories. On this basis, we reveal the analytical relationship between packet throughput and the paramerters of spread spectrum and error correction coding in our proposed anti-interference system, which enables the design of a parameter optimization algorithm that maximizes packet throughput. For reception, by jointly utilizing the autocorrelation function of spreading sequence and the cyclic-shift property of AFDM input-output relation, we design a linear-complexity correlation-based DAFT domain detector (CDD) capable of achieving full diversity gain, which performs correlation-based equalization to avoid matrix inversion. Numerical results validate the accuracy of the derived closed-form expressions and verify that the proposed anti-interference AFDM system could achieve high packet throughput under interference in high-mobility scenarios.