214 research outputs found
Waveform Design for 5G and Beyond
5G is envisioned to improve major key performance indicators (KPIs), such as
peak data rate, spectral efficiency, power consumption, complexity, connection
density, latency, and mobility. This chapter aims to provide a complete picture
of the ongoing 5G waveform discussions and overviews the major candidates. It
provides a brief description of the waveform and reveals the 5G use cases and
waveform design requirements. The chapter presents the main features of cyclic
prefix-orthogonal frequency-division multiplexing (CP-OFDM) that is deployed in
4G LTE systems. CP-OFDM is the baseline of the 5G waveform discussions since
the performance of a new waveform is usually compared with it. The chapter
examines the essential characteristics of the major waveform candidates along
with the related advantages and disadvantages. It summarizes and compares the
key features of different waveforms.Comment: 22 pages, 21 figures, 2 tables; accepted version (The URL for the
final version:
https://onlinelibrary.wiley.com/doi/abs/10.1002/9781119333142.ch2
On Spectral Coexistence of CP-OFDM and FB-MC Waveforms in 5G Networks
Future 5G networks will serve a variety of applications that will coexist on
the same spectral band and geographical area, in an uncoordinated and
asynchronous manner. It is widely accepted that using CP-OFDM, the waveform
used by most current communication systems, will make it difficult to achieve
this paradigm. Especially, CP-OFDM is not adapted for spectral coexistence
because of its poor spectral localization. Therefore, it has been widely
suggested to use filter bank based multi carrier (FB-MC) waveforms with
enhanced spectral localization to replace CP-OFDM. Especially, FB-MC waveforms
are expected to facilitate coexistence with legacy CP-OFDM based systems.
However, this idea is based on the observation of the PSD of FB-MC waveforms
only. In this paper, we demonstrate that this approach is flawed and show what
metric should be used to rate interference between FB-MC and CP-OFDM systems.
Finally, our results show that using FB-MC waveforms does not facilitate
coexistence with CP-OFDM based systems to a high extent.Comment: Manuscript submitted for review to IEEE Transactions on Wireless
Communication
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