Iterative Distortion Cancellation Algorithms for Single-Sideband Systems

TL;DR

This paper introduces an iterative digital algorithm that effectively cancels distortion caused by dither signals in single-sideband systems, enhancing receiver sensitivity without hardware modifications.

Contribution

The paper presents a novel iterative distortion cancellation algorithm that leverages KK relations, improving system performance in single-sideband systems without changing physical hardware.

Findings

Improved tolerance to dither amplitudes up to 10% V{ extpi} in back-to-back tests.

Increased receiver sensitivity by over 1 dB in 80-km fiber transmission.

Effective distortion mitigation demonstrated through experimental validation.

Abstract

We propose an iterative distortion cancellation algorithm to digitally mitigate the impact of double-sideband dither signal amplitude from the automatic bias control module on Kramers-Kronig receivers without modifying physical layer structures. The algorithm utilizes the KK relation for initial signal decisions and reconstructs the distortion caused by dither signals. Experimental tests in back-to-back showed it improved tolerance to dither amplitudes up to 10% V{\pi}. For 80-km fiber transmission, the algorithm increased the receiver sensitivity by more than 1 dB, confirming the effectiveness of the proposed distortion cancellation method.