A Novel Precoding Based Hybrid MC/SC Radio Access System for PAPR Reduction in Layered OFDMA of LTE-Advanced

This paper presents a novel precoding based
hybrid multi-carrier/single-carrier (MC/SC) uplink radio
access system for layered orthogonal frequency division
multiple access (Layered-OFDMA) of long-term-evolution
advanced (LTE-Advanced). Generalized-Chirp-like (GCL)
precoder is implemented before subcarrier mapping and IFFT
to reduce the high peak-to-average power ratio (PAPR) of MC
uplink system. Conventional localized single carrier frequency
division multiple access (LFDMA) is also implemented to
support all the functionalities provided in release 8 LTE.
Extensive computer simulations have been performed to
analyze the PAPR of precoding based MC/SC uplink system.
The computer simulations show that the PAPR of GCL
precoded MC signals approaches in the order of SC signals.
Additionally, GCL precoded MC system also take the
advantage of the frequency variations of the communication
channel and can also offer substantial performance gain in
fading multipath channels.