Energy and Spectrum Efficient Transmission Modes for the 3GPP-LTE Uplink

In this paper we report on PAPR reduction techniques using DFT precoding at the user equipment transmitter as discussed in standardization for 3GPP-long-term-evolution (LTE) uplink. We propose to combine DFT precoding and frequency dependent scheduling, a so called a virtual multiuser DFT precoding technique, to achieve high spectral efficiency in moderate and high SNR condition. This technique enables flexible and efficient utilization of frequency resources. It also enables multiple service for users with different quality of service and error protection requirements. For cell edge users with low SNR, we show that DFT precoding with filtering similar to single carrier transmission with appropriate pulse shaping is a reasonable option to increase the cell edge throughput.