Comparative Analysis of Peak Correlation Characteristics of Non-Orthogonal Spreading Codes for Wireless Systems

TL;DR

This paper evaluates the peak correlation properties of various non-orthogonal spreading codes in CDMA wireless systems to identify codes that optimize auto-correlation and cross-correlation characteristics, addressing a key challenge in code selection.

Contribution

It provides a comprehensive analysis of non-orthogonal spreading codes' correlation characteristics and proposes a suitable code solution for improved CDMA system performance.

Findings

Identified codes with optimal auto-correlation peaks.

Highlighted codes with minimal cross-correlation.

Suggested a code family balancing correlation properties.

Abstract

The performance of a CDMA based wireless system is largely dependent on the characteristics of pseudo-random spreading codes. The spreading codes should be carefully chosen to ensure highest possible peak value of auto-correlation function and lower correlation peaks (side-lobes) at non-zero time-shifts. Simultaneously, zero cross-correlation value at all time shifts is required in order to eliminate the effect of multiple access interference at the receiver. But no such code family exists which possess both characteristics simultaneously. That's why an exhaustive effort has been made in this paper to evaluate the peak correlation characteristics of various non-orthogonal spreading codes and suggest a suitable solution.