Peak Power Reduction of OFDM Systems Through Tone Injection via Parametric Minimum Cross-Entropy Method

• Published in: IEEE transactions on vehicular technology Vol. 62; no. 4; pp. 1838 - 1843
• Main Authors: Damavandi, M. G., Abbasfar, A., Michelson, D. G.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.05.2013; Institute of Electrical and Electronics Engineers
• Subjects: Applied sciences; Complexity theory; Cross constellations; Electrical engineering. Electrical power engineering; Electrical power engineering; Entropy; Exact sciences and technology; Information, signal and communications theory; Miscellaneous; Modulation, demodulation; Multiplexing; orthogonal frequency-division multiplexing (OFDM); parametric minimum cross-entropy (PMCE) method; Peak to average power ratio; peak-to-average power ratio (PAPR); peak-to-mean envelope power ratio (PMEPR); Power networks and lines; Quadrature amplitude modulation; Signal and communications theory; Smoothing methods; Storage area networks; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; tone injection (TI); Transmission and modulation (techniques and equipments); Performance evaluation; Quadrature amplitude modulation; Combinatorial problem; Optimization method; Peak to average power ratio; Entropy; Combinatorial optimization; Selection criterion; peak-to-average power ratio (PAPR); Peak power; tone injection (TI); peak-to-mean envelope power ratio (PMEPR); Cross constellations; Minimum entropy methods; Computational complexity; parametric minimum cross-entropy (PMCE) method; Electrical network; Tone injection; Interconnection; Optimal solution; Integrated circuit; Greedy algorithm; Orthogonal frequency division multiplexing; Numerical simulation; System simulation; Comparative study; orthogonal frequency-division multiplexing (OFDM); Via hole
• ISSN: 0018-9545; 1939-9359
• DOI: 10.1109/TVT.2012.2233507

It is well known that the major drawback of orthogonal frequency-division multiplexing (OFDM) is its high peak-to-mean envelope power ratio (PMEPR). One of the promising schemes proposed for alleviating the high PMEPR of OFDM signals is tone injection (TI). In this paper, we propose a novel low-complexity algorithm for PMEPR reduction using TI. This algorithm first formulates the TI scheme as a combinatorial optimization problem and then finds a near-optimal solution to this problem via parametric minimum cross-entropy (PMCE) method. We also demonstrate that by effectively exploiting TI schemes in conjunction with cross constellations, it is possible to reduce the peak power of the system by more than 2 dB compared with sign selection schemes over conventional quadrature-amplitude modulation (QAM) constellations. Simulation results show that our algorithm outperforms similar existing algorithms, including the cross-entropy (CE) TI algorithm, the greedy sign selection algorithm, and the derandomization sign selection algorithm, in terms of PMEPR. We also present a threshold-based PMCE algorithm for TI that results in significant complexity reduction. Numerical results show that to achieve a prescribed PMEPR threshold, this threshold-based PMCE algorithm requires less computational complexity than the CE TI algorithm.