PAPR Reduction Method Based on Commonly Reserved Tones Among Multiple Users in FDMA Uplink

This paper proposes a tone reservation (TR) method using common reserved tones among users for reducing the peak-to-average power ratio (PAPR) of transmit signals in the frequency division multiple access (FDMA) uplink. The proposed method utilizes a frequency block common to frequency-multiplexed users to transmit PAPR reduction signals. In general, TR does not cause interference from PAPR reduction signals in the data transmission band at the cost of the bandwidth loss due to the use of part of the transmission band exclusively for PAPR reduction. The proposed method reduces the bandwidth loss needed to transmit the PAPR reduction signal as the number of frequency-multiplexed users increases. This is achieved by using a common bandwidth for PAPR reduction among these users. Computer simulations considering the effect of nonlinear power amplifiers show quantitatively that the proposed method improves the packet error rate (PER) compared to the clipping and filtering (CF) based PAPR reduction method, especially when the number of multiplexed users is large.