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Related Experiment Video

Updated: Jun 28, 2026

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

Distortion-free delta-sigma beamforming.

Carl-Inge Colombo Nilsen¹, Sverre Holm

¹Dept. of Inf., Univ. of Oslo, Oslo, Norway. carlingn@ifl.uio.no

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

|November 7, 2008

Summary

This study introduces a new method to remove distortion in digital beamformers using delta-sigma converters. The novel technique enhances signal quality without adding system complexity.

Area of Science:

Electrical Engineering
Signal Processing

Background:

Digital beamformers commonly use delta-sigma analog-to-digital converters (A/D).
Applying dynamic delays to the delta-sigma bitstream introduces signal distortion.
Existing methods to mitigate this distortion often increase system complexity.

Purpose of the Study:

To analyze distortion in digital beamformers with 1-bit delta-sigma A/D converters.
To introduce a new, low-complexity method for distortion removal.
To validate the new method through theoretical analysis and simulations.

Main Methods:

Analysis of a compact, digital delay-and-sum beamformer architecture.
Application of dynamic delays directly to the delta-sigma modulated bitstream.
Development and description of a novel distortion removal technique using standard system terminology.

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Main Results:

Characterization of signal distortion caused by time-variant operations in delta-sigma demodulators.
Introduction of a new method to eliminate distortion without significant complexity increase.
Theoretical and simulation-based validation of the proposed distortion removal technique.

Conclusions:

The novel method effectively removes distortion in digital beamformers with delta-sigma A/D converters.
The proposed technique offers a practical solution for improving signal fidelity.
This approach presents advantages in performance without compromising system simplicity.