FD-FBMC: A Solution for Multicarrier Full Duplex Cellular Systems

Abstract

This letter reports on a critical issue with the application of OFDM to a full-duplex (FD) cellular system. With small frequency offsets of uplink signals, the downlink BER increases considerably. This is attributed to the high spectral-leakage-interference from the OFDM waveforms of geographically nearby uplink users. As an alternative, we propose applying the FBMC waveform to the same FD cellular system scenario. We calculate the precise spectral-leakage-interference for OFDM and FBMC, based on which, we set up a semianalytic BER simulation framework. Analysis and numerical results confirm that spectral leakage interference from uplink signals is the critical performance limiting factor. Even with tiny frequency offsets among the users, the performance of FD with OFDM is severely degraded. Although the FDs with the other multicarrier waveforms having lower spectral leakage such as GFDM, UFMC, and f-OFDM overcome this issue to a certain extent, the degradations remain substantial. However, the FBMC-based FD cellular system achieves almost spectralleakage-interference-free performance, and thus, it substantially outperforms the counterparts with other waveforms.

Three-Mode Opportunistic Full-Duplex Switching

“…Compared to (15) which is for homogeneous QoS (identical target SINRs among UEs) case, the RSI term of kth uplink in (56) contains lth UE's target SINR and vice versa in (58). Therefore, unlike (15) and (17),…”

“…In [14], TNFD and HD were compared when the BS is equipped with multiple antennas and it was demonstrated that the average sum rate of TNFD can be increased with the employment of linear precoding. Meanwhile, in the other works on OFD cellular system [6], [15], [16], the UEs as well as the BS are modelled to be equipped with FD transceivers, and they can bi-directionally communicate with the BS as shown in Fig. 1(b).…”

“…1(b). This FD model is called bidirectional FD (BiFD or BFD) [6], [15]- [17]. In comparison, both TNFD and BiFD have different interference models owing to their different link topologies.…”

Análisis de la modulación multiplexación por división de frecuencia generalizada

“…que agrupan los K pulsos encargados de transmitir cada k muestras del primer subsímbolo. Situando los K pulsos transmisores de las k muestras del segundo subsímbolo y así sucesivamente hasta tener M bloques de K pulsos transmisores [9,10]. Donde cada agrupación de K pulsos realiza la elevación en frecuencia correspondiente.…”

Multicarrier Modulation Schemes for 5G Wireless Access

“…In [8], the performance of Full Duplex FBMC (FD-FBMC) was examined, considering it as a solution for the full-duplex multicarrier scheme for cellular systems. The performance of the OFDM system was reported in terms of spectral leakage interference.…”