Iterative receiver for clipped GFDM signals

Multicarrier communication is a well-known and widely used method in the current wireless or wired data transmission. Orthogonal Frequency Division Multiplexing (OFDM) is the leading technology in this area and is implemented in various forms in almost every current broadband communication systems. It has a number of advantages, but also few significant shortcomings. Especially the high out-of-band radiation and high peak-to-average ratio (PAPR). For that reason, it is inconvenient to employ OFDM in particular applications, e.g. Cognitive Radio (CR). The Generalized Frequency Division Multiplexing (GFDM) is a novel non-orthogonal multicarrier waveform design method, which can be considered as an alternative to OFDM in some scenarios. However, also GFDM can suffer from high PAPR. In this article, we will show that clipping can be conveniently used for PARP reduction of GFDM signals. But, on the other hand, clipping causes nonlinear degradation of the signal and that means worse bit error ratio (BER). One of the solutions to this problem is to use iterative reception for nonlinear noise mitigation. Therefore, the main goal of the article is to propose an iterative receiver structure for deliberately clipped GFDM signals. The simulations show that the BER performance of the GFDM system, undergoing clipping as PARP reduction technique, can be significantly improved using the proposed iterative receiver.