Abstract
Offset-QAM-based filterbank multicarrier (FBMC-OQAM) has been shown to be a promising alternative to cyclic prefix-orthogonal frequency division multiplexing for the future generation of wireless communication systems. Unfortunately, as the channel gets more selective in time and frequency, the FBMC-OQAM orthogonality is progressively destroyed and distortion appears after the demodulation process at the receiver. While channel frequency selectivity has been very widely studied in the FBMC literature, the impact of time selectivity of the channel has not received that much attention. In this paper, the effect of the two types of selectivity on a multiple-input multiple-output (MIMO) FBMC system is characterized and a parallel equalization structure that can compensate for the doubly dispersive nature of the channel is proposed. This design uses multiple analysis filterbanks and extends previous approaches that were dealing only with channel frequency selectivity. A theoretical approximation of the remaining distortion after equalization is given. The study is performed for a general MIMO system but can also be particularized to single-input single-output systems. Simulation results demonstrate the high efficiency of the proposed receiver structure and the accuracy of the theoretical approximations is verified.
Highlights
Offset-QAM-based filterbank multicarrier (FBMC-OQAM) has been shown to be an attractive alternative to cyclic prefixorthogonal frequency division multiplexing (CP-OFDM) as the new modulation format in the generations of wireless communication systems
FBMC-OQAM does not require the use of a cyclic prefix (CP), which again increases the spectral efficiency of the system [3]
As the channel gets more selective in time and frequency, distortion will appear and FBMC will suffer from so-called intrinsic interference caused by inter-symbol interference (ISI) and inter-carrier interference (ICI)
Summary
Offset-QAM-based filterbank multicarrier (FBMC-OQAM) has been shown to be an attractive alternative to cyclic prefixorthogonal frequency division multiplexing (CP-OFDM) as the new modulation format in the generations of wireless communication systems. We propose a new receiver structure for MIMO FBMC-OQAM systems that can compensate for both the time and frequency selectivity of the channel. This receiver uses multiple analysis filterbanks (AFB) working in parallel on the received signal. The demodulated symbols coming from each parallel AFB are equalized and re-combined in order to mitigate the distortion caused by the channel variations This processing does not require any additional delay as opposed to multi-tap equalizers and has a relatively low complexity of implementation.
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