Reducing the Peak-to-Average Power Ratio of OFDM Signals Through Precoding

• Published in: IEEE transactions on vehicular technology Vol. 56; no. 2; pp. 686 - 695
• Main Author: Slimane, Slimane Ben
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.03.2007; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Bandwidth efficiency; Blocking; Broadband; Channels; Coding, codes; Communication channels; Computer simulation; Costs; Degradation; Detection, estimation, filtering, equalization, prediction; diversity gain; Diversity methods; Exact sciences and technology; Fading; fading multipath; Frequency variation; Information technology; Information, signal and communications theory; Informationsteknik; low complexity; Multiplexing; OFDM modulation; Orthogonal Frequency Division Multiplexing; orthogonal-frequency-division-multiplexing (OFDM); Peak to average power ratio; peak-to-average power ratio (PAPR); Performance gain; power efficiency; precoding; Radio transmitters; Reduction; Signal and communications theory; Signal, noise; SRA - ICT; SRA - Informations- och kommunikationsteknik; Studies; Symbols; Systems, networks and services of telecommunications; TECHNOLOGY; TEKNIKVETENSKAP; Telecommunications; Telecommunications and information theory; Transmission and modulation (techniques and equipments); Performance evaluation; low complexity; Peak to average power ratio; Transmitter; orthogonal-frequency-division- multiplexing (OFDM); precoding; Multipath channels; Optimization; Coding; peak-to-average power ratio (PAPR); High rate transmission; power efficiency; Fading channels; Fading; Computer simulation; Transmission channel; Wide band transmission; Single carrier; Equalization; diversity gain; fading multipath; Bandwidth efficiency; Orthogonal frequency division multiplexing; Signal processing; Non linear effect; Radio communication
• ISSN: 0018-9545; 1939-9359; 1939-9359
• DOI: 10.1109/TVT.2007.891409

Orthogonal-frequency-division-multiplexing (OFDM) techniques allow the transmission of high data rates over broadband radio channels subject to multipath fading without the need for powerful channel equalization. However, they are very sensitive to nonlinear effects due to the high peak-to-average power ratio (PAPR) owned by their transmitted signals. This paper proposes an efficient technique for reducing the PAPR of OFDM signals. The proposed technique is data-independent and, thus, does not require new processing and optimization for each transmitted OFDM block. The reduction in PAPR of the OFDM signal is obtained through a proper selection of a precoding scheme that distributes the power of each modulated symbol over the OFDM block. The obtained results show that this precoding scheme is an attractive solution to the PAPR problem of OFDM signals. It is shown, through computer simulations, that the PAPR of precoded OFDM signals approaches that of single-carrier signals. The good improvement in PAPR given by the present technique permits the reduction of the complexity and cost of the transmitter significantly. The precoding schemes also take advantage of the frequency variations of the communication channel and can provide considerable performance gain in fading-multipath channels.