Continuous-Phase Modulation for DFT-Spread Localized OFDM

Massive machine-type communications to support a large number of low-cost, low-power, and/or low-rate radio-frequency transceivers such as Internet-of-Things (IoT) devices is a major usage scenario of the 5G mobile communication system. To save cost and power, highly nonlinear power amplifiers (PAs)...

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Bibliographic Details
Published in:IEEE open journal of the Communications Society 2021, Vol.2, p.1405-1418
Main Authors: Choi, Jeonghoon, Cho, Joon Ho, Lehnert, James S.
Format: Article
Language:English
Subjects:
5G mobile communication
Binary phase shift keying
constellation rotation
Continuous-phase modulation
DFT-spread OFDM
Discrete Fourier transforms
Distortion
Fourier transforms
Internet of Things
minimum-shift keying
Mobile communication systems
Modulation
nonlinear power amplifier
Orthogonal Frequency Division Multiplexing
Peak to average power ratio
Phase modulation
Power amplifiers
Power management
pulse shaping
Transceivers
Uplink
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Summary:Massive machine-type communications to support a large number of low-cost, low-power, and/or low-rate radio-frequency transceivers such as Internet-of-Things (IoT) devices is a major usage scenario of the 5G mobile communication system. To save cost and power, highly nonlinear power amplifiers (PAs) are expected to be used in the devices. However, the envelope fluctuation of the input of a PA may make the output suffer from severe nonlinear distortion. In this paper, a continuous-phase modulation is proposed for discrete-Fourier transform (DFT)-spread localized orthogonal frequency-division multiplexing (OFDM) of \pi /2 -BPSK symbols. In particular, the combination of a spectrum shaping vector and an extra rotation angle is proposed, which enables the use of a receiver that is fully compatible with the current standard. It is shown that the proposed design significantly outperforms the conventional designs in terms of effective signal-to-distortion ratio and error vector magnitude at the cost of a negligible increase in out-of-band emission.
ISSN:2644-125X
2644-125X
DOI:10.1109/OJCOMS.2021.3089690