Impulse Radio Systems with Multiple Types of Ultra-Wideband Pulses

TL;DR

This paper analyzes multi-pulse impulse radio ultra-wideband systems with pulse-based polarity randomization, showing that using multiple pulse types reduces multiple-access interference and improves robustness.

Contribution

It introduces a multi-pulse approach for impulse radio systems, deriving spectral and error probability expressions, demonstrating enhanced interference mitigation over classical systems.

Findings

Power spectral density is the average of different pulse shapes.

Closed-form bit error probability expressions are derived.

Multi-pulse systems are more robust against multiple-access interference.

Abstract

Spectral properties and performance of multi-pulse impulse radio ultra-wideband systems with pulse-based polarity randomization are analyzed. Instead of a single type of pulse transmitted in each frame, multiple types of pulses are considered, which is shown to reduce the effects of multiple-access interference. First, the spectral properties of a multi-pulse impulse radio system is investigated. It is shown that the power spectral density is the average of spectral contents of different pulse shapes. Then, approximate closed-form expressions for bit error probability of a multi-pulse impulse radio system are derived for RAKE receivers in asynchronous multiuser environments. The theoretical and simulation results indicate that impulse radio systems that are more robust against multiple-access interference than a "classical" impulse radio system can be designed with multiple types of ultra-wideband pulses.