Globally optimal tradeoff curves for OFDM PAR reduction [peak-to-average power ratio]

• Published in: IEEE Workshop onSignal Processing Systems, 2004. SIPS 2004 pp. 12 - 17
• Main Authors: Aggarwal, A., Meng, T.H.
• Format: Conference Proceeding
• Language: English
• Published: Piscataway NJ IEEE 2004
• Subjects: Algorithm design and analysis; Applied sciences; Computational modeling; Contacts; Decoding; Exact sciences and technology; Information, signal and communications theory; Multiplexing; OFDM; Partial transmit sequences; Peak to average power ratio; Power engineering computing; Quadrature phase shift keying; Signal and communications theory; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Transmission and modulation (techniques and equipments); Wireless LAN; Wireless LAN; Quadrature amplitude modulation; Simulation; Wireless telecommunication; Peak to average power ratio; Orthogonal frequency division multiplexing; Optimization; Quadrature phase shift keying
• ISBN: 9780780385047; 0780385047
• DOI: 10.1109/SIPS.2004.1363017

This paper describes an efficient convex optimization technique for computing the globally optimal tradeoff curves between OFDM peak-to-average power ratio (PAR), constellation error, and free carrier power. The OFDM system designer can select a suitable PAR reduction method by comparing the achieved performance of various algorithms with these optimal tradeoff curves. Simulation results are presented for the 802.11a/g WLAN standard. The power wasted in the free carriers can be substantially reduced by taking advantage of the allowed constellation error and by backing off 1 dB from the globally minimum PAR. A convex interior-point method reaches the desired tradeoff point within two iterations for both QPSK and 64-QAM.