Reducing the Peak-to-Average Power Ratio of OFDM Signals Through Precoding
2007 (English)In: IEEE Transactions on Vehicular Technology, ISSN 0018-9545, E-ISSN 1939-9359, Vol. 56, no 2, 686-695 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
IEEE , 2007. Vol. 56, no 2, 686-695 p.
Bandwidth efficiency, diversity gain, fading multipath, low complexity, orthogonal-frequency-division-multiplexing (OFDM), peak-to-average power ratio (PAPR), power efficiency, precoding
Computer and Information Science
Research subject SRA - ICT
IdentifiersURN: urn:nbn:se:kth:diva-29793DOI: 10.1109/TVT.2007.891409ISI: 000245191000028ScopusID: 2-s2.0-34147119540OAI: oai:DiVA.org:kth-29793DiVA: diva2:398053
QC 201102172011-02-162011-02-162011-11-29Bibliographically approved