Impact of Directionality on Interference Mitigation in Full-Duplex Cellular Networks

Abstract

Abstract-In this paper, we consider two fundamental fullduplex (FD) architectures, two-node and three-node, in the context of cellular networks where the terminals employ directional antennas. The simultaneous transmission and reception of data in non-orthogonal channels makes FD radio a potential solution for the currently limited spectrum. However, its implementation generates high levels of interference either in the form of loopback interference (LI) from the output to the input antenna of a transceiver or in the form of co-channel interference in largescale multicell networks due to the large number of active links. Using a stochastic geometry model, we investigate how directional antennas can control and mitigate the co-channel interference. Furthermore, we provide a model which characterizes the way directional antennas manage the LI in order to passively suppress it. Our results show that both architectures can benefit significantly by the employment of directional antennas. Finally, we consider the case where both architectures are employed in the network and derive the optimal values for the density fraction of each architecture which maximize the success probability and the network throughput.

Energy Efficiency Maximization via Joint Sub-Carrier Assignment and Power Control for OFDMA Full Duplex Networks

“…(1) The vector x ∈ R N K×1 represents the sub-carrier assignment of all the UEs and the vector p = [p u , p d ] T represents the transmit power of UEs and BS, where p u = [p u n,k ] T N ×K is the UEs transmit power vector in UL and p d = [p d n,k ] T N ×K is the BS transmit power vector in DL. Considering a combination of the passive and active SIC methods [43] for all the UEs and BS, we assume that the residual SI is proportional to the transmit power (similar to [14], [20], [22]- [24] and [34]- [37]). It should be noted that in practice, SI cannot be canceled completely even if the SI channel is perfectly known at the IBFD BS as well as IBFD UEs due to the limited dynamic range of the receiver [42].…”

“…However, there are few efforts for redesigning the resource allocation algorithms in IBFD cellular networks. The authors of [14]- [21] apply the IBFD capability to OFDMA wireless networks employing different architectures. In particular, IBFD cellular networks can be categorized into two-node and three-node architectures [14].…”

Transmission Capacity of Full-Duplex MIMO Ad-Hoc Network with Limited Self-Interference Cancellation

“…Then, the network intensity λ HD can be formulated by following (20) to (23). Finally, the TC-UB of HD case can be obtained as c u,HD (ǫ) = 2λ HD n+1 (1 − ǫ)R.…”

A Stochastic Geometry Approach to Full‐Duplex MIMO Relay Network

“…For instance, an active method known as analog cancellation, to cancel the interfering signal at the receiving antenna, utilizes additional radio frequency (RF) chains; and there is another active cancellation method known as digital cancellation, where the RSI is removed in the base-band level after the analog-to-digital converter [19]; another simple passive method is known as antenna separation, where the RSI is attenuated due to the path-loss between the transmitting and receiving antennas on the FD node. Further, reducing the FD interference using directional antennas is analyzed in [20]. References [21,22] quantify the impact of self-interference of a heterogeneous network consisting of FD and HD nodes.…”