Fast DGT Based Receivers for GFDM in Broadband Channels

TL;DR

This paper introduces a novel DGT-based receiver for GFDM in broadband channels, effectively mitigating interference and reducing computational complexity, thus enhancing 5G waveform performance.

Contribution

It proposes a DGT-based receiver for GFDM that addresses ICI and ISI issues and introduces a low-complexity local DGT method.

Findings

The DGT-based receiver effectively eliminates ISI and ICI in broadband channels.

The local DGT reduces computational complexity compared to traditional methods.

Analyses demonstrate the efficiency of the proposed DGT-based approach.

Abstract

Generalized frequency division multiplexing (GFDM) is a recent multicarrier 5G waveform candidate with flexibility of pulse shaping filters. However, the flexibility of choosing a pulse shaping filter may result in inter carrier interference (ICI) and inter symbol interference (ISI), which becomes more severe in a broadband channel. In order to eliminate the ISI and ICI, based on discrete Gabor transform (DGT), in this paper, a transmit GFDM signal is first treated as an inverse DGT (IDGT), and then a frequency-domain DGT is formulated to recover (as a receiver) the GFDM signal. Furthermore, to reduce the complexity, a suboptimal frequency-domain DGT called local DGT (LDGT) is developed. Some analyses are also given for the proposed DGT based receivers.