PAPR reduction with multiple antennas transmission for carrier aggregation

Carrier aggregation (CA) is one technique in Long Term Evolution - Advanced (LTE-A) system, which can extend the bandwidth up to 100MHz and increase the downlink and uplink spectral efficiency. In particular, NxDFT-s-OFDM has been agreed as the uplink bandwidth extension scheme. Nevertheless, the peak-to-average power ratio (PAPR) remains an important issue for user equipment (UE) because it determines the power amplifier (PA) efficiency when multi-carrier transmission is employed. In this paper, a closed-loop component mapping scheme is proposed to solve the PAPR problem caused by the aggregated component carriers (CC). To introduce more diversity gain, a time domain codeword mixing technique is developed to make sure that each Turbo codeword is transmitted through multiple component carriers and multiple antennas. Simulation results show the performance improvements and prove the effective of our proposed approach in terms of PAPR and Block Error Rate (BLER).