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Related Experiment Video

Updated: Jul 7, 2026

Quasi-light Storage for Optical Data Packets

Quasi-light Storage for Optical Data Packets

Published on: February 6, 2014

Code optimization for direct sequence spread spectrum and SAW-matched filter implementation.

O Hikino¹, M A Belkerdid, D C Malocha

¹Hitachi Media Electron., Yokohama, Japan.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

|February 2, 2008

Summary

This summary is machine-generated.

This study presents a novel algorithm to reduce time sidelobes in pseudonoise (PN) sequences for direct sequence spread spectrum (DS-SS) systems. Optimized sequences demonstrate superior correlation properties compared to existing methods.

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Area of Science:

Signal Processing
Telecommunications Engineering
Applied Mathematics

Background:

Pseudonoise (PN) sequences are crucial for Direct Sequence Spread Spectrum (DS-SS) systems.
Minimizing time sidelobes in PN sequence correlations is essential for system performance.
Existing PN sequences (m-sequences, Gold, Barker) have limitations in sidelobe suppression.

Purpose of the Study:

To introduce a new optimization algorithm for minimizing time sidelobes of PN sequence correlation functions.
To develop optimized time sidelobe level sequences for DS-SS systems using digital modulations.
To evaluate the correlation characteristics of the optimized sequences and their implementation using Surface Acoustic Wave (SAW) devices.

Main Methods:

A dynamic weighting algorithm is applied to PN sequences.
The algorithm iteratively optimizes sidelobes for identical and alternating data bits.
Optimized sequences are implemented using apodized SAW-matched filters.

Main Results:

The optimized sequences exhibit excellent correlation characteristics, outperforming conventional PN sequences.
SAW-matched filters designed for optimized sequences show good agreement between theoretical predictions and experimental results.
The algorithm effectively suppresses time sidelobes for improved DS-SS system performance.

Conclusions:

The proposed optimization algorithm offers a significant improvement in time sidelobe reduction for PN sequences.
The developed optimized sequences are suitable for various digital modulations in DS-SS applications.
SAW device implementation validates the effectiveness of the optimized sequences and the algorithm.