  Generalized frequency division multiplexing (GFDM) is a promising candidate
waveform for next-generation wireless communication systems. However, GFDM
channel estimation is still challenging due to the inherent interference. In
this paper, we formulate a pilot design framework with linear minimum mean
square error (LMMSE) channel estimation for GFDM, and propose a novel pilot
design to achieve interference precancellation during pilot generation with the
fixed transmit sample values at selected frequency bins. Numerical results
demonstrate that the proposed method reduces the channel estimation mean square
error and the symbol error rate (SER) in high signal-to-noise ratio (SNR)
regions, compared with the conventional methods.
