Iterative Reduction of Out-of-Band Power and Peak-to-Average Power Ratio for Non-Contiguous OFDM Systems Based on POCS

Yanqing LIU; Liang DONG

doi:10.1587/transcom.2016EBP3326

Iterative Reduction of Out-of-Band Power and Peak-to-Average Power Ratio for Non-Contiguous OFDM Systems Based on POCS

Yanqing LIU, Liang DONG

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Non-contiguous orthogonal frequency-division multiplexing (OFDM) is a promising technique for cognitive radio systems. The secondary users transmit on the selected subcarriers to avoid the frequencies being used by the primary users. However, the out-of-band power (OBP) of the OFDM-modulated tones induces interference to the primary users. Another major drawback of OFDM-based system is their high peak-to-average power ratio (PAPR). In this paper, algorithms are proposed to jointly reduce the OBP and the PAPR for non-contiguous OFDM based on the method of alternating projections onto convex sets. Several OFDM subcarriers are selected to accommodate the adjusting weights for OBP and PAPR reduction. The frequency-domain OFDM symbol is projected onto two convex sets that are defined according to the OBP requirements and the PAPR limits. Each projection iteration solves a convex optimization problem. The projection onto the set constrained by the OBP requirement can be calculated using an iterative algorithm which has low computational complexity. Simulation results show good performance of joint reduction of the OBP and the PAPR. The proposed algorithms converge quickly in a few iterations.

Publication: IEICE TRANSACTIONS on Communications Vol.E100-B No.8 pp.1489-1497

Publication Date: 2017/08/01

Publicized: 2017/02/17

Online ISSN: 1745-1345

DOI: 10.1587/transcom.2016EBP3326

Type of Manuscript: PAPER

Category: Terrestrial Wireless Communication/Broadcasting Technologies

Authors

Yanqing LIU
Jiangxi University of Finance and Economics
Liang DONG
Baylor University

Keyword

non-contiguous OFDM, out-of-band power suppression, PAPR reduction, alternating projections onto convex sets

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Yanqing LIU, Liang DONG, "Iterative Reduction of Out-of-Band Power and Peak-to-Average Power Ratio for Non-Contiguous OFDM Systems Based on POCS" in IEICE TRANSACTIONS on Communications, vol. E100-B, no. 8, pp. 1489-1497, August 2017, doi: 10.1587/transcom.2016EBP3326.
Abstract: Non-contiguous orthogonal frequency-division multiplexing (OFDM) is a promising technique for cognitive radio systems. The secondary users transmit on the selected subcarriers to avoid the frequencies being used by the primary users. However, the out-of-band power (OBP) of the OFDM-modulated tones induces interference to the primary users. Another major drawback of OFDM-based system is their high peak-to-average power ratio (PAPR). In this paper, algorithms are proposed to jointly reduce the OBP and the PAPR for non-contiguous OFDM based on the method of alternating projections onto convex sets. Several OFDM subcarriers are selected to accommodate the adjusting weights for OBP and PAPR reduction. The frequency-domain OFDM symbol is projected onto two convex sets that are defined according to the OBP requirements and the PAPR limits. Each projection iteration solves a convex optimization problem. The projection onto the set constrained by the OBP requirement can be calculated using an iterative algorithm which has low computational complexity. Simulation results show good performance of joint reduction of the OBP and the PAPR. The proposed algorithms converge quickly in a few iterations.
URL: https://global.ieice.org/en_transactions/communications/10.1587/transcom.2016EBP3326/_p

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@ARTICLE{e100-b_8_1489,
author={Yanqing LIU, Liang DONG, },
journal={IEICE TRANSACTIONS on Communications},
title={Iterative Reduction of Out-of-Band Power and Peak-to-Average Power Ratio for Non-Contiguous OFDM Systems Based on POCS},
year={2017},
volume={E100-B},
number={8},
pages={1489-1497},
abstract={Non-contiguous orthogonal frequency-division multiplexing (OFDM) is a promising technique for cognitive radio systems. The secondary users transmit on the selected subcarriers to avoid the frequencies being used by the primary users. However, the out-of-band power (OBP) of the OFDM-modulated tones induces interference to the primary users. Another major drawback of OFDM-based system is their high peak-to-average power ratio (PAPR). In this paper, algorithms are proposed to jointly reduce the OBP and the PAPR for non-contiguous OFDM based on the method of alternating projections onto convex sets. Several OFDM subcarriers are selected to accommodate the adjusting weights for OBP and PAPR reduction. The frequency-domain OFDM symbol is projected onto two convex sets that are defined according to the OBP requirements and the PAPR limits. Each projection iteration solves a convex optimization problem. The projection onto the set constrained by the OBP requirement can be calculated using an iterative algorithm which has low computational complexity. Simulation results show good performance of joint reduction of the OBP and the PAPR. The proposed algorithms converge quickly in a few iterations.},
keywords={},
doi={10.1587/transcom.2016EBP3326},
ISSN={1745-1345},
month={August},}

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TY - JOUR
TI - Iterative Reduction of Out-of-Band Power and Peak-to-Average Power Ratio for Non-Contiguous OFDM Systems Based on POCS
T2 - IEICE TRANSACTIONS on Communications
SP - 1489
EP - 1497
AU - Yanqing LIU
AU - Liang DONG
PY - 2017
DO - 10.1587/transcom.2016EBP3326
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E100-B
IS - 8
JA - IEICE TRANSACTIONS on Communications
Y1 - August 2017
AB - Non-contiguous orthogonal frequency-division multiplexing (OFDM) is a promising technique for cognitive radio systems. The secondary users transmit on the selected subcarriers to avoid the frequencies being used by the primary users. However, the out-of-band power (OBP) of the OFDM-modulated tones induces interference to the primary users. Another major drawback of OFDM-based system is their high peak-to-average power ratio (PAPR). In this paper, algorithms are proposed to jointly reduce the OBP and the PAPR for non-contiguous OFDM based on the method of alternating projections onto convex sets. Several OFDM subcarriers are selected to accommodate the adjusting weights for OBP and PAPR reduction. The frequency-domain OFDM symbol is projected onto two convex sets that are defined according to the OBP requirements and the PAPR limits. Each projection iteration solves a convex optimization problem. The projection onto the set constrained by the OBP requirement can be calculated using an iterative algorithm which has low computational complexity. Simulation results show good performance of joint reduction of the OBP and the PAPR. The proposed algorithms converge quickly in a few iterations.
ER -