Abstract
Amplification of generalized multicarrier (GMC) signals by high-power amplifiers (HPAs) before transmission can result in undesirable out-of-band spectral components, necessitating power backoff, and low HPA efficiency. We evaluate variations of several peak-to-average power ratio (PAPR) reduction and HPA linearization techniques which were previously proposed for OFDM signals. Our main emphasis is on their applicability to the more general class of GMC signals, including serial modulation and DFT-precoded OFDM. Required power backoff is shown to depend on the type of signal transmitted, the specific HPA nonlinearity characteristic, and the spectrum mask which is imposed to limit adjacent channel interference. PAPR reduction and HPA linearization techniques are shown to be very effective when combined.
Highlights
High-power amplifiers (HPAs) used in radio transmitters have nonlinear characteristics which can cause significant distortion to signals whose instantaneous power fluctuations come too close to the HPAs output saturation power
Rather than introducing significantly new peak-to-average power ratio (PAPR) reduction techniques, we focus on the spectral regrowth reduction that existing schemes and variations of them can achieve for important classes of generalized multicarrier (GMC) signals at the output of a realistic HPA
Transmitted signal power spectra must be confined within spectral masks which are designed to prevent excessive out-of-band interference to adjacent channel users
Summary
High-power amplifiers (HPAs) used in radio transmitters have nonlinear characteristics which can cause significant distortion to signals whose instantaneous power fluctuations come too close to the HPAs output saturation power. EURASIP Journal on Wireless Communications and Networking known as generalized multicarrier (GMC) signals [5,6,7] This class includes OFDM and frequency domain-generated single-carrier signals, as well as multicarrier signals with noncontiguous spectral occupancy. Previous analyses of spectral regrowth generally rely on power series expansions, with few terms, of HPA input/output characteristic models [8], but more general models, capable of representing a wide range of HPAs, are best accommodated by simulation of output power spectra. This is the approach we use in this paper. This paper presents these and other results in a unifying context
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