Peak-to-average power ratio reduction in LTE-advanced systems using low complexity and low delay PTS

摘要

Peak-to-average power ratio (PAPR) is the main parameter affecting the implementation cost of wireless transmitters utilising carrier aggregation in the end-users' channels. In each frequency band, single-carrier frequency division multiple access (SC-FDMA) is exploited as the interface from the transmitter to the receiver, and carrier aggregation is implemented by SC-FDMA on each band. Hence, the power amplifier simultaneously amplifies signals of multiple bands, meaning that its PAPR is affected by the use of multiple SC-FDMA channels. In this study, a novel method has been proposed for the delay and PAPR reduction in carrier aggregation systems. Also, a novel recursive method is proposed to reduce the computational complexity of the proposed partial transmit sequence (PTS) algorithm. Utilising computer simulations, it has been shown that the PAPR can be reduced by 3.5 dB for the time-domain PTS method in mapping for the three-band SC-FDMA comparing to existing methods.