# Linear GFDM: A Low Out-of-band Emission Configuration for 5G Air Interface

## TL;DR

This paper introduces a modified GFDM configuration that achieves spectral containment comparable to FBMC, with low out-of-band emissions suitable for 5G, validated through BER, spectral density, and PAPR analyses across various channel models.

## Contribution

The paper presents a novel Linear GFDM configuration that matches FBMC's spectral containment, enhancing GFDM's flexibility for 5G applications.

## Key findings

- Linear GFDM achieves spectral containment similar to FBMC.
- Performance is consistent across different channel models.
- Low out-of-band emissions are demonstrated.

## Abstract

This paper explores the flexibility of generalized frequency division multiplexing (GFDM) for achieving the same performance as filter bank multicarrier (FBMC). We present a GFDM configuration where the good spectral containment of FBMC is also achieved through a modification in the GFDM transmission scheme. For evaluating the scheme's performance, we estimate the bit error ratio (BER) under three channel models: i) pure additive Gaussian AWGN; ii) time-invariant frequency-selective; iii) time-variant frequency-selective (doubly dispersive). The spectral containment is measured through the power spectral density. Furthermore, the complementary cumulative distribution function (CCDF) of the peak-to-average power ratio (PAPR) is also estimated. The Linear GFDM waveform shows identical performance when compared to FBMC in the above test scenarios.

---
Source: https://tomesphere.com/paper/1902.09823