Performance Enhancement of Multiuser Time Reversal UWB Communication System

TL;DR

This paper investigates enhancing multiuser UWB communication using Time Reversal techniques, introducing a modified TR filter with circular shift to improve signal quality and reduce interference.

Contribution

It proposes a novel circular shift TR filter for multiuser UWB systems and analyzes its effectiveness through measurements and theoretical study.

Findings

Circular shift TR filter improves SIR in multiuser environments

Modified TR filter enhances received signal peak power

Analysis confirms reduced interference with circular shift operation

Abstract

UWB communication is a recent research area for indoor propagation channels. Time Reversal (TR) communication in UWB has shown promising results for improving the system performance. In multiuser environment, the system performance is significantly degraded due to the interference among different users. TR reduces the interference caused by multiusers due to its spatial focusing property. The performance of a multiuser TR communication system is further improved if the TR filter is modified. In this paper, multiuser TR in UWB communication is investigated using simple TR filter and a modified TR filter with circular shift operation. The concept of circular shift in TR is analytically studied. Thereafter, the channel impulse responses (CIR) of a typical indoor laboratory environment are measured. The measured CIRs are used to analyze the received signal peak power and signal to interference ratio (SIR) with and without performing the circular shift operation in a multiuser environment.