Interleaved PC-OFDM to reduce the peak-to-average power ratio
نویسنده
چکیده
Parallel combinatory orthogonal frequency division multiplexing (PC-OFDM) yields lower maximum peak-toaverage power ratio (PAR), higher bandwidth efficiency and lower bit error rate probability (BER) on Gaussian channels compared to OFDM systems. However, PC-OFDM does not improve the statistics of PAR significantly. In this paper, the use of a set of fixed permutations to improve the statistics of the PAR of a PC-OFDM signal is presented. For this technique, interleavers are used to produce permuted sequences from the same information sequence before coding using PC-OFDM. The Sequence with the lowest PAR, among sequences is chosen for the transmission . The PAR of a PC-OFDM signal can be further reduced by 3-4 dB by this technique. Mathematical expressions for the complementary cumulative density function (CCDF) of PAR of PC-OFDM signal and interleaved PC-OFDM signal are also presented.
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