Time Delay Estimation in Cognitive Radio Systems

TL;DR

This paper investigates time delay estimation techniques in cognitive radio systems with dispersed frequency bands, analyzing theoretical limits, proposing two-step estimators, and validating findings through simulations.

Contribution

It introduces and analyzes two-step time delay estimators tailored for cognitive radio systems with dispersed bands, highlighting their optimality and performance trade-offs.

Findings

Theoretical bounds on time delay estimation are reviewed.

Two-step estimators offer a balance between complexity and accuracy.

Simulation results confirm the theoretical analysis.

Abstract

In cognitive radio systems, secondary users can utilize multiple dispersed bands that are not used by primary users. In this paper, time delay estimation of signals that occupy multiple dispersed bands is studied. First, theoretical limits on time delay estimation are reviewed. Then, two-step time delay estimators that provide trade-offs between computational complexity and performance are investigated. In addition, asymptotic optimality properties of the two-step time delay estimators are discussed. Finally, simulation results are presented to explain the theoretical results.