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Reducing the peak-to-average power ratio of orthogonal frequency division multiplexing signal through bit or symbol interleaving

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2 Author(s)
Jayalath, A.D.S. ; Dept. of Comput. Sci. & Software Eng., Monash Univ., Clayton, Vic., Australia ; Tellambura, C.

An interleaver-based technique for improving the peak-to-average power ratio (PAP) of an orthogonal frequency division multiplexing signal is presented. For this technique, K-1 random interleavers are used to produce (K-1) permuted sequences from the same information sequence. The PAPs of the permuted sequences and the original information sequence are then computed using K oversampled fast Fourier transforms (OFFTs). The sequence with the lowest PAP is chosen for transmission. Results show that for 256 subcarriers and quadrature phase shift keying data symbols, even with K=2, the 0.1% PAP is reduced by 1.3 dB and with K=4 it is reduced by 2 dB. The 0.1% PAP can be reduced by 3 dB and the 0.01% PAP by 4 dB at a cost of 16 OFFTs and a data rate loss of <0.8% with K=16

Published in:

Electronics Letters  (Volume:36 ,  Issue: 13 )

Date of Publication:

22 Jun 2000

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