Full duplex cellular systems: will doubling interference prevent doubling capacity?

GEO Satellite Feeder Links and Terrestrial Full-Duplex Small Cells: A Case for Coexistence

“…These are dependent on (a) distance of the BS (UT2) from the GW, (b) relative off-axis angles of the BS (UT2) and GW and (c) propagation impairments and antenna gains [3]. b) Internode Interference (INI): In a generic setting, UT2 suffers INI from UT1 transmissions in small cells [19]. However, in a FDR set-up, INI manifests as a direct path between the UTs.…”

Hop-by-Hop ZF Beamforming for MIMO Full-Duplex Relaying With Co-Channel Interference

“…Lately, full-duplex (FD) relaying received upsurge of research interest due to its capability to increase spectral efficiency (see e.g., [1]- [8]), which is solely because of the fact that full-duplex nodes receive and re-transmit the information symbol over the same time and frequency, consequently, efficiently employing the spectrum resources of the network. However, the main hurdle of FD terminals is the loopback self-interference (LI) brought about by the signal infiltration from the terminal's transmission to its own reception, specifically, the huge power differences between the one transmitted from the FD terminal and its received signal (the received signal is extremely weaker than that of the transmitted one due to the heavy path loss and fading), which surpass the dynamic range of the analoge-to-digital converter.…”

“…However, the main hurdle of FD terminals is the loopback self-interference (LI) brought about by the signal infiltration from the terminal's transmission to its own reception, specifically, the huge power differences between the one transmitted from the FD terminal and its received signal (the received signal is extremely weaker than that of the transmitted one due to the heavy path loss and fading), which surpass the dynamic range of the analoge-to-digital converter. Therefore, LI alleviation and elimination is indispensable for the implementation of FD mode operation [1]- [5], [9].…”

“…Note that the SVD based approach in [14] and [7] is considered under specific assumptions on the number of relay receive and transmit antennas. However, to our best knowledge, the effect of co-channel interference (CCI) 1 on the overall performance of FD relaying with multipleantenna terminals has not been investigated yet, i.e., the general case of multiple antenna terminals with CCI at the relay and destination, utilizing transmit (receive) ZF beamforming (combining) has not been analyzed in the literature for both HD and FD relaying modes 2 . Note that ZF beamforming is employed particularly due to its robustness against the severe effects of CCI and fading, where this is achieved by steering the transmitted signal along the strongest eigenmodes of the source → relay (S → R) and relay → destination (R → D) null-space-projected channels.…”

“…However, FD relaying networks are more susceptible to CCI because of the higher frequency reuse in contrast to its conventional HD relaying rival. For instance, in the case of multi-cell framework where FD relay base stations and HD users, an extremely greater level of CCI is noticed 1 The frequency reuse to improve the spectrum efficiency of wireless networks causes the harmful effect of CCI in the FD multi-cell environment.…”