Abstract
This paper discusses a single-carrier signal with a Modified Root Roll-off (MRR) filter to attain a lower Peak-to-Average Power Ratio (PAPR) than that of the conventional Root Raised Cosine (RRC) filter. A combination of the MRR filter on the transmitter side and the RRC filter on the receiver side satisfies the Nyquist criterion since the total transfer function has a roll-off region expressed in a sum of sinusoidal functions such as A sin(x) and B sin(3x). The coefficients are fixed so that the PAPR of the transmitted signal can be minimized under the constant bandwidth condition given by the roll-off factor. The PAPR reducing effects of the MRR filter are approximately 0.5 dB and 1 dB when the roll-off factors are 0.6 and 1, respectively. The above result shows that the MRR filter is applicable to generating the transmitted signal with a low PAPR in the commercial wireless communication systems where the receiver uses the RRC filter. The MRR filter would be useful to design a system under a strict condition of power amplifiers such as a sub-THz communication system that is one of beyond 5G system candidates.
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