favorite50In this context, the GFDM pioneer concept of a circular filtered MC system , along with other waveforms presented in Section VI, provides a very flexible time-frequency structure that favors software exposition, controlling, and virtualization.
favorite4When considering the scenarios for 5G, namely: Internet of Things (IoT), Tactile Internet, bitpipe connectivity, and Wireless Regional Area Network (WRAN), the requirements go far beyond increasing throughput: loose synchronization for IoT; low latency for Tactile Internet; reliable, efficient, and robust high throughput for bitpitpe communication; high coverage and dynamic spectrum allocation with low out-of-band (OOB) emission and CR techniques to cover WRAN applications.
favorite5Hence, a block oriented concept will be used to provide the modulation service, emulating different flavors of waveforms designed to go beyond the well-established Orthogonal Frequency Division Multiplexing (OFDM) principles, in scenarios where they perform best.
favorite9The main contribution of this paper is to show that Generalized Frequency Division Multiplexing (GFDM), as a baseline of flexible circular filtered multicarrier systems, can be used as a framework to virtualize the PHY service for the upper layers of 5G networks.
favorite2Accordingly, in GFDM both subsymbols and subcarriers are localized in time and frequency domains, compared to VOFDM where all data spreads over the entire spectrum and VB are interleaved in the time domain.
favorite5Finally, reading the resulting matrix column-wise, the corresponding time-domain signals for each row in D are transmitted in an interleaved way.
favorite3An K-point IFFT is performed along the columns of D, i.e. Finally each SS is multiplied element-wise by a circularly rotated version of the pulse shaping filter and all subsymbols are summed up to generate the GFDM transmit signal.
favorite76This document provides a comparison of the transmission techniques used in Generalized Frequency Division Multiplexing (GFDM) and Vector-OFDM (VOFDM).