Publication date: Available online 11 November 2013
Source:Physical Communication
Author(s): Taewoo Lee , Hideki Ochiai
Single-carrier frequency-division multiple-access (SC-FDMA) is adopted as the uplink radio access scheme of the recent mobile wireless communication system known as the Long Term Evolution - Advanced (LTE-A). Since it is based on single-carrier signaling, its modulated signal generally has lower peak-to-average power ratio (PAPR) than that of multi-carrier-based signals such as orthogonal frequency-division multiple-access (OFDMA). However, the subsequent filter (or DFT precoding) after modulation considerably increases the peak power even for PSK and this reduces the benefit of using single-carrier signaling from the viewpoint of power amplifier efficiency. In this paper, we propose a peak power reduction of SC-FDMA signal by modifying the trellis shaping technique that has recently developed for peak power reduction of conventional single-carrier modulation. It is shown that the proposed approach can successfully reduce the signal envelope of SC-FDMA signal and thus help increasing the efficiency of the overall system.
Source:Physical Communication
Author(s): Taewoo Lee , Hideki Ochiai