5G Field Trials: OFDM-Based Waveforms and Mixed Numerologies

Service diversity is expected in the upcoming fifth-generation (5G) cellular networks, which poses great challenges to the underlying waveforms to accommodate heterogeneous service requirements in a flexible way. By dividing the bandwidth into several subbands, each having a different numerology, th...

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Bibliographic Details
Published in:IEEE journal on selected areas in communications 2017-06, Vol.35 (6), p.1234-1243
Main Authors: Peng Guan, Dan Wu, Tingjian Tian, Jianwei Zhou, Xi Zhang, Liang Gu, Benjebbour, Anass, Iwabuchi, Masashi, Kishiyama, Yoshihisa
Format: Article
Language:English
Subjects:
5G mobile communication
Bandwidth
Bandwidths
Baseband
Cellular communication
Efficiency
Feasibility
field trial
filtered-OFDM
Interference
Long Term Evolution
Noise prediction
OFDM
Orthogonal Frequency Division Multiplexing
Prototypes
Radio frequency
Robustness
Signal to noise ratio
Spectrum allocation
Time division
waveform
Waveforms
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Summary:Service diversity is expected in the upcoming fifth-generation (5G) cellular networks, which poses great challenges to the underlying waveforms to accommodate heterogeneous service requirements in a flexible way. By dividing the bandwidth into several subbands, each having a different numerology, this paper reports a field trial in time division duplex downlink conducted on a configurable test bed in a real-world environment for the performance evaluations of orthogonal frequency-division multiplexing (OFDM)-based 5G waveform candidates, i.e., cyclically prefixed OFDM (CP-OFDM), windowing OFDM (W-OFDM), and filtered OFDM (f-OFDM), in the presence of mixed numerologies. Field trial results confirm the feasibility of mixed numerologies and reveal the impact of several important system parameters, e.g., guard bandwidth, data bandwidth, signal-to-noise ratio (SNR), and transmit power. The results also suggest that f-OFDM outperforms CP-OFDM and W-OFDM in terms of both the spectrum efficiency and robustness in a high SNR regime, and the gain increases with a higher inter-numerology out-of-band interference. In some specific scenarios, ideal spectrum utilization can be realized by f-OFDM which completely removes the guard band.
ISSN:0733-8716
1558-0008
DOI:10.1109/JSAC.2017.2687718