PAPR reduction in LTE-Advanced carrier aggregation using low-complexity joint interleaving technique

The demand for high data rates in both the uplink and the downlink has motivated the use of carrier aggregation (CA) of several portions of the spectrum up to 100 MHz in LTE-Advanced, while maintaining backward compatibility with LTE release 8. One of the main practical challenges that comes with CA is the severe increase of peak-to-average-power-ratio (PAPR) of the corresponding generated time-domain OFDM signal, thus affecting the power amplifier (PA) efficiency, and hence the transmission coverage. This paper proposes a low-complexity joint interleaving technique to reduce the PAPR of carrier aggregated signals. Several CA scenarios were analyzed using our proposed technique. Simulation results demonstrate that our proposed technique can achieve the same PAPR reduction performance as that of the partial selective mapping (PSLM) technique with 66% reduction in terms of real multiplication and addition operations for the case of three aggregated component carriers (CCs).