International audience—In this paper, we justify low-complexity equalization techniques for weighted cyclic prefix (WCP)-OFDM. This modulation technique refers to filter bank based multicarrier (FBMC) transmission system provided with short filters. It allows the use of non-rectangular waveforms in order to mitigate interference caused by time-frequency selective channels while preserving an efficient implementation. Index Terms—Time-varying multipath channels, filter bank based multicarrier modulations, equalization, efficient realization
In this paper, we study the performance of filter bank based multicarrier (FBMC) transmission systems over doubly-dispersive channels. FBMC generalizes traditional orthogonal frequency-division multiplexing (OFDM) schemes, allowing a non-rectangular sub-channel pulse shape in the time domain. This approach leads to a better spectral containment that improves interference mitigation in several time-variant environments. A general analysis describes the transmultiplexer structure and the time-variant multipath channel model. We specify rectangular filters and short perfect reconstruction (PR) filters that give rise to two families of FBMC transceivers. A performance comparison between these schemes is performed in terms of bit-error-rate using a single-tap per sub-channel equalizer. This study emphasizes the low complexity of the FBMC transceivers in the case of short filters and discusses its usefulness through simulation results in two mobility scenarios.
Various correlation-based receivers have been proposed in passive bistatic and active monostatic radar exploiting orthogonal frequency-division multiplexing (OFDM) communications signals, but too little has been dedicated to establishing their relations and advantages over each other. Accordingly, this paper provides an analytical comparison of the common filters in such waveform sharing scenarios, along with a performance analysis regarding three criteria: computational complexity, signal-tointerference-plus-noise-ratio and resilience to ground clutter. The last two especially assess the possible detrimental effects of the random sidelobes (or pedestal) induced by the data symbols in the range-Doppler map. Although simulations show that none of the filters performs unanimously better, the ones employing circular correlations globally evidence attractive results.
This paper investigates a radar-communications waveform sharing scenario. Particularly, it addresses the selfinterference phenomenon induced by independent single-point scatterers throughout a low-complexity monostatic OFDM-based radar receiver from a statistical viewpoint. Accordingly, an analytical expression of the post-processing signal-to-interferenceplus-noise-ratio is derived and detection performance is quantified in simulated scenarios for rectangular and non-rectangular pulses. Both metrics suggest that this phenomenon must be further handled.
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