Pulse shaping approach to PAPR reduction for multiuser OFDM systems

Abstract

Multiuser orthogonal frequency division multiplexing (MU-OFDM) communication systems have higher system efficiency compared to single user OFDM systems. However, the high peak-to-average power ratio (PAPR) of the MU-OFDM signal is considered as one of the major drawbacks of the MU-OFDM systems. This paper proposes to use computationally efficient optimisation approach to design a set of orthogonal pulse shaping waveforms to reduce the PAPR of the MU-OFDM signal. Autocorrelation and cross-correlation of the pulse shaping waveforms are specified in the constraints in order to minimise intersymbol interference (ISI) and co-channel interference (CCI). Methods to solve the optimal waveform set design problem are presented. Numerical results illustrate that the designed set of pulse shaping waveforms is efficient in reducing the PAPR of the OFDM signal in multiuser communication systems.