Pulse Shaped OFDM for 5G Systems
OFDM-based waveforms with filtering or windowing functionalities are considered key enablers for a flexible air-interface design for multi-service support in future 5G systems. One candidate from this category of waveforms is pulse shaped OFDM, which follows the idea of subcarrier filtering and aims...
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Zusammenfassung: | OFDM-based waveforms with filtering or windowing functionalities are
considered key enablers for a flexible air-interface design for multi-service
support in future 5G systems. One candidate from this category of waveforms is
pulse shaped OFDM, which follows the idea of subcarrier filtering and aims at
fully maintaining the advantages of standard OFDM systems while addressing
their drawbacks. In this paper, we elaborate on several pulse shaping design
methods, and show how pulse shapes can be exploited as an additional degree of
freedom to provide better frequency localization and more efficient spectrum
utilization under a pre-defined spectrum mask. The performance analysis and
evaluation results show that, for a practical mobile communication systems, the
application of pulse shaping is a simple and effective means to achieve a lower
out-of-band leakage for OFDM systems at virtually no costs. In fact, the
complexity increase amounts to 1-2% compared to CP-OFDM only. In addition, the
system's robustness against both time and frequency distortions is shown to be
substantially improved by a proper pulse shape design. By allowing for the
flexible configuration of physical layer parameters per sub-band according to
the diverse requirements of future 5G services, pulse shaped OFDM systems can
efficiently facilitate asynchronous transmissions and fragmented spectrum
access, rendering it beneficial for various mobile-broadband and
Internet-of-Things applications. |
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DOI: | 10.48550/arxiv.1605.03731 |