Minimizing the Peak-to-Average Power Ratio of OFDM Signals Using Convex Optimization
作者： A. Aggarwal , T.H. Meng
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摘要: The main disadvantage of orthogonal frequency-division multiplexing (OFDM) is the high time-domain peak-to-average power ratio (PAR) that limits transmitter efficiency. Assuming no changes in receiver structure, can only reduce PAR by distorting data carriers or adding to free carriers. This paper shows OFDM signal with globally minimum PAR, subject constraints on allowed constellation error and carrier power, be efficiently computed using convex optimization. Simulation results are presented for 802.11a/g wireless local-area network standard. constraint, ranges from 0.7 dB 6-Mbps binary phase-shift keying 4.1 54-Mbps 64-QAM. Tradeoff analysis drastically reduced backing off this less than 1 dB. A customized interior-point method (IPM) derived solving optimization problem. IPM reaches desired tradeoff between within two iterations, where computational complexity per iteration four fast Fourier transforms plus solution a linear system equations. about 100 times faster general-purpose algorithm
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