  Transmission of complex-valued symbols using filter bank multicarrier systems
has been an issue due to the self-interference between the transmitted symbols
both in the time and frequency domain (so-called intrinsic interference). In
this paper, we propose a novel low-complexity interference-free filter bank
multicarrier system with QAM modulation (FBMC/QAM) using filter deconvolution.
The proposed method is based on inversion of the prototype filters which
completely removes the intrinsic interference at the receiver and allows the
use of complex-valued signaling. The interference terms in FBMC/QAM with and
without the proposed system are analyzed and compared in terms of mean square
error (MSE). It is shown with theoretical and simulation results that the
proposed method cancels the intrinsic interference and improves the output
signal to interference plus noise ratio (SINR) at the expense of slight
enhancement of residual interferences caused by multipath channel. The
complexity of the proposed system is also analyzed along with performance
evaluation in an asynchronous multiservice scenario. It is shown that the
proposed FBMC/QAM system with filter deconvolution outperforms the conventional
OFDM system.
