Pulse Shaping Methods for OQAM/OFDM and WCP-COQAM

TL;DR

This paper demonstrates that pulse design methods for OQAM-OFDM are also applicable to WCP-COQAM, facilitating orthogonality and potentially improving 5G modulation schemes.

Contribution

It proves that orthogonality conditions for OQAM-OFDM pulses are valid for WCP-COQAM, enabling the use of existing pulse design techniques.

Findings

Orthogonality conditions are shared between OQAM-OFDM and WCP-COQAM.

Pulse design methods for OQAM-OFDM are applicable to WCP-COQAM.

Simulation results confirm theoretical findings.

Abstract

GFDM is a new modulation format whose advantages compared to OFDM reportedly make it a preferable modulation format for 5G. However, the non-orthogonal nature of GFDM with matched filtering (MF) receiver for pulses with good time-frequency localization is one of its disadvantages, leading to the proposal of WCP-COQAM, employing offset quadrature amplitude modulation (OQAM). In this paper, we prove that a pulse satisfying orthogonality conditions for OQAM-OFDM will also satisfy orthogonality with WCP-COQAM, thus the pulse design methods developed for OQAM-OFDM can also be used with WCP-COQAM. This statement is also verified by the simulation based results.