Abstract. The main
disadvantage of data transmission systems based on OFDM is a high
peak-to-average power ratio (PAPR) of OFDM signal. One of the most powerful
methods of PAPR decrease is a tone reservation method. However it has low performance
when signal bandwidth is narrow. Modified tone reservation method that allows reduction
PAPR in comparison with classic TR method is proposed in the paper. Additional
PAPR reduction is obtained using limited outband emission which doesn’t violate
requirements of electromagnetic compatibility. Comparative modeling of classic
and modified tone reservation method was performed for transmission part of
second generation Realtime Audiovisual Information System (RAVIS).
Complementary cumulative distribution functions are given in the paper. Results
of modeling shows that modified TR method allow to decrease peak-to-average
power ratio by additional 1.50, 1.23, 0.77, 0.58, 0.29, 0.23 dB when 2.5% of
carriers are used for TR and 0.73, 0.64, 0.50 0.65, 0.66, 0.63 dB when 5% of
carriers are used for TR within signal bandwidth 100, 200, 250, 500, 750, 1000
kHz respectively. Achieved PAPR values with confidence level γ=0,999 are
in range from 7.56 to 7.74 dB when 2.5% of carriers are used for TR and in
range from 6.65 to 7.38 dB when 5% of carriers are used for TR. Proposed method
is capable to compete with SeLective Mapping (SLM) method even within narrow
signal bandwidth, where SLM have high efficiency. Thus proposed modified TR
method provides significantly better decrease of PAPR within narrow and wide
signal bandwidth than classic method with the same data transmission rate
losses.
Key
words:
OFDM, peak-to-average power ratio, tone reservation method, outband emission,
RAVIS.
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