On Partially Overlapping Coexistence for Dynamic Spectrum Access in Cognitive Radio

TL;DR

This paper investigates how to enable coexistence of multiple radio systems with minimal frequency separation, using techniques like windowing and nulling to reduce interference and improve spectral efficiency in cognitive radio environments.

Contribution

It introduces a study of partially overlapping coexistence scenarios with specific techniques to minimize frequency separation while maintaining target BER in cognitive radio.

Findings

Windowing and nulling reduce required frequency separation.

Techniques impact OFDM spectral efficiency and PAPR.

Guidelines for coexistence in cognitive radio environments.

Abstract

In this paper, we study partially overlapping co-existence scenarios in cognitive radio environment. We consider an Orthogonal Frequency Division Multiplexing (OFDM) cognitive system coexisting with a narrow-band (NB) and an OFDM primary system, respectively. We focus on finding the minimum frequency separation between the coexisting systems to meet a certain target BER. Windowing and nulling are used as simple techniques to reduce the OFDM out-of-band radiations, and, hence decrease the separation. The effect of these techniques on the OFDM spectral efficiency and PAPR is also studied.