K. Anwar, A.U. Priantoro, M. Saito, M. Okada, and H. Yamamoto (Japan)
PAPR, wavelet, multicarrier modulation (MCM),frequency domain spreading and carrier interferometry
In this paper, we investigate the PAPR of wavelet-based multicarrier modulation (MCM) system for high-speed digital communications. With wavelet, guard interval within one symbol period is not needed, therefore no overhead are required and no decreasing of the bandwidth efficiency. On the other hand, a common issue with multi carrier modulation system is the high peak-to-average power ratio (PAPR) due to superposition of a large number of independently modulated sub-carriers in parallel at the transmitter. Reducing PAPR is essential for realizing power efficiency, which is important issue for future generation of mobile communication systems. Our computer simulation results, clarified that Haar wavelet based MCM system exhibits low PAPR values when frequency domain spreading using Hadamard code is employed. Although with oversampling, the PAPR of wavelet based MCM are still lower in compared to the PAPR of orthogonal frequency division multiplexing (OFDM) in which carrier interferometry (CI) code is employed.
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