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Wavelet Radio by Homayoun Nikookar

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5 Peak-to-average power ratio

5.1 Background

Wavelet packet modulation (WPM) is a new transmission technique that is seen as a promising alternative to the well-established orthogonal frequency division multiplexing (OFDM). The main advantage of WPM is that the transmission characteristics of the system can be adapted according to the radio environment to maximize resource utilization. However, as in OFDM, WPM transmission also suffers from large power fluctuations and high peak-to-average power ratio (PAPR). Multi-carrier systems such as WPM or the classical OFDM combine many independently modulated sub-carriers to obtain a composite signal. If sub-carriers add coherently, then the peak power of the composite OFDM/WPM signal can be many times ...

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