Journal
IEEE ACCESS
Volume 9, Issue -, Pages 15659-15669Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/ACCESS.2021.3051664
Keywords
Transmitters; Peak to average power ratio; Iterative algorithms; Signal reconstruction; Internet of Things; Uplink; Standards; Orthogonal frequency division multiplexing (OFDM); nonlinear noise; Papoulis-Gerchberg algorithm; peak-to-average power ratio (PAPR); 802.11ah
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This article focuses on the issue of high power consumption in the 802.11ah uplink transmitter due to high PAPR, and introduces a novel scheme called ISR for receiver-side signal compensation, which can improve PA efficiency by 4-9 dB for uplink signaling.
An orthogonal frequency division multiplexing (OFDM) transmitter for 802.11ah uplink may consume unnecessarily high power due to the malicious effect of a large peak-to-average power ratio (PAPR). This is particularly a problem for client devices (CDs) under the low-power wide-area (LPWA) technology in an Internet of thing (IoT) system, where high PAPR signals may drive the power amplifier (PA) to operate with large input back-off (IBO). This article focuses on receiver-side signal compensation (SC) techniques and introduces a novel scheme called iterative subcarrier regularization (ISR), which is based on the generalization of Papoulis-Gerchberg algorithm (GPGA). We claim that the proposed scheme is completely compatible with 802.11ah as it only exploits the prior information available in the standard operations and popular system-build-in functions in the iterative signal reconstruction process. Extensive numerical evaluations demonstrate that the proposed scheme can improve PA efficiency by 4-9 dB for uplink signaling.
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