Embedding and detection of side information for peak-to-average power ratio reduction of an OFDM signal using partial transmit sequences

The peak-to-average power ratio (PAPR) problem of OFDM systems can be efficiently resolved using the partial transmit sequences (PTS) method, for which data recovery requires side information (SI) about the phase rotation factors used at the transmitter. With no loss of spectrum efficiency, two embedded SI transmission schemes (I and II), including frequency-domain marking algorithms and decision statistics, are proposed for PSK data and one (III) for QAM data. A time-domain implementation of the proposed marking algorithms is presented for reducing complexity. Simulation results demonstrate the good performance of the proposed schemes, especially for scheme III.

I. Introduction

Orthogonal frequency division multiplexing (OFDM) modulation has attracted considerable attention in a variety of high-speed communication applications due to its robustness against multipath fading and narrowband interference. However, the potentially high peak-to-average power ratio (PAPR) of an OFDM signal may lead to the effects of in-band signal distortion and out-of-band radiation when using a typical RF power amplifier without sufficient power back-off [1], [2]. Conventional solution to this problem is simply utilizing a power amplifier with a large linear range and large power back-off at the expense of low power efficiency, high power consumption, and high manufacturing cost. Alternatively, the problem can be resolved by using PAPR reduction methods such as deliberately clipping method [1], selective mapping (SLM) method [3], [4], and partial transmit sequences (PTS) method [4]–[7].