A Low-Complexity PAPR Reduction Technique for LTE-Advanced Uplink with Carrier Aggregation

In LTE-Advanced, carrier aggregation (CA) is a key enabling technique to increase the peak data rates of users and enhance the mobility management in heterogeneous networks (HetNets) using dual connectivity solutions. Several CA schemes have been proposed with a maximum of five LTE Release 8 component carriers (CCs) where the NxSC-FDMA has been chosen as the bandwidth extension scheme for the uplink. This enables the extension of the bandwidth allocated to a user up to 100 MHz while maintaining backward compatibility with LTE release 8 legacy users. However, CA leads to a severe increase in the peak-to-average-power ratio (PAPR) of the aggregated time domain NxSC-FDMA signal at the user equipment (UE). This is an important issue as it affects the power amplifier (PA) efficiency and hence the coverage of transmissions. In this paper, we propose a low- complexity post-IFFT technique to reduce the PAPR of carrier aggregated NxSC-FDMA signals in the uplink of LTE-Advanced. Several case studies of CA were analyzed by using the proposed technique. Simulation results show that the PAPR improvement is 2.5 dB for the case of 2 CCs at only about 4% of the complexity required by the partial selective mapping (PSLM) technique to achieve the same PAPR reduction.

[1]  Mohsen Guizani,et al.  Carrier aggregation for LTE-advanced: uplink multiple access and transmission enhancement features , 2013, IEEE Wireless Communications.

[2]  Gauraw Kumar Srivastava,et al.  Crest factor reduction for carrier aggregated OFDM systems , 2012, SoftCOM 2012, 20th International Conference on Software, Telecommunications and Computer Networks.

[3]  Michael Faulkner,et al.  Reducing the peak-to-average power ratio in OFDM by cyclically shifting partial transmit sequences , 2000 .

[4]  Kamran Etemad,et al.  Carrier aggregation framework in 3GPP LTE-advanced [WiMAX/LTE Update] , 2010, IEEE Communications Magazine.

[5]  Yasir Rahmatallah,et al.  Peak-To-Average Power Ratio Reduction in OFDM Systems: A Survey And Taxonomy , 2013, IEEE Communications Surveys & Tutorials.

[6]  Xu Ning,et al.  PAPR reduction of uplink for carrier aggregation in LTE-Advanced , 2010, The 2nd International Conference on Information Science and Engineering.

[7]  Slim Boumaiza,et al.  Crest Factor Reduction of Inter-Band Multi-Standard Carrier Aggregated Signals , 2014, IEEE Transactions on Microwave Theory and Techniques.

[8]  David J. Goodman,et al.  Peak-To-Average Power Ratio of Single Carrier FDMA Signals with Pulse Shaping , 2006, 2006 IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications.

[9]  Yan Meng,et al.  PAPR reduction with multiple antennas transmission for carrier aggregation , 2012, 2012 IEEE 23rd International Symposium on Personal, Indoor and Mobile Radio Communications - (PIMRC).

[10]  Hassan Artail,et al.  KLT-based PAPR reduction technique for LTE-Advanced uplink with carrier aggregation , 2015, 2015 IEEE 11th International Conference on Wireless and Mobile Computing, Networking and Communications (WiMob).

[11]  Hassan Artail,et al.  PAPR reduction in LTE-Advanced carrier aggregation using low-complexity joint interleaving technique , 2015, 2015 IEEE Wireless Communications and Networking Conference (WCNC).

[12]  Hlaing Minn,et al.  Low complexity PAPR reduction methods for carrier-aggregated MIMO OFDMA and SC-FDMA systems , 2012, EURASIP J. Wirel. Commun. Netw..