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The use of interleaving to reduce the peak-to-average power ratio of an OFDM signal

Jayalath, Dhammika & Tellambura, Chintha (2000) The use of interleaving to reduce the peak-to-average power ratio of an OFDM signal. In IEEE Global Telecommunications Conference, 2000 (GLOBECOM '00)., 27 Nov.-1 Dec. 2000, San Francisco, CA.

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Abstract

An interleaver based technique for improving the peak-to-average power ratio (PAP) of an orthogonal frequency division multiplexing (OFDM) signal is presented. For this technique, K-1 random interleavers are used to produce K-1 permuted sequences from the same information sequence. PAPs of the permuted sequences and the original information sequence are then computed using K oversampled FFTs (OFFTs). The sequence with the lowest PAP is chosen for transmission. The complementary cumulative density function (CCDF), of PAP of an interleaved OFDM signal is observed. Results show that for 256 subcarriers and QPSK data symbols, even with K=2, the 0.1% CCDF is reduced by 1.3 dB and with K=4, is reduced by 2 dB. The 0.1% CCDF can be reduced by 3 dB and 0.01% CCDF by 4 dB at a cost of 16 OFFTs and a data rate loss of less than 0.8% with K-16. Further statistical improvement for the PAP is obtained by combining this approach and the partial transmit sequence (PTS) approach. This paper also proposes an adaptive approach to reduce the complexity of the interleaving technique.

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ID Code: 13789
Item Type: Conference Paper
Keywords: OFDM, interleaving, Peak, to, Average Power Ratio, PAR
DOI: 10.1109/GLOCOM.2000.891696
ISBN: 0780364511
Subjects: Australian and New Zealand Standard Research Classification > TECHNOLOGY (100000) > COMMUNICATIONS TECHNOLOGIES (100500) > Communications Technologies not elsewhere classified (100599)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Copyright Owner: Copyright 2000 IEEE
Copyright Statement: Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Deposited On: 16 Jun 2008
Last Modified: 11 Aug 2011 03:48

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