The benefits from simultaneous transmission and reception in wireless networks

Abstract

In a wireless network, the problem of self interference arises whenever a node transmits and receives simultaneously in the same frequency band. So far only two extreme approaches to circumvent this problem were thoroughly investigated in the literature. The first one prevents any node to transmit and receive simultaneously which may lead to a too conservative design. The second one assumes perfect self interference cancelation which can be too optimistic since it ignores all possible technological limitations. To fill this gap, we provide a method to evaluate the network layer benefits from simultaneous transmission and reception when the network nodes employ self interference cancelation techniques with different degrees of accuracy. From a network design perspective, the provided method can be used to find the required level of accuracy for the self interference cancelation such that certain gains are achieved at the network layer. Numerical results suggest that the accuracy of existing self interference cancelation techniques can provide significant gains for certain network setups.

Analog/RF Solutions Enabling Compact Full-Duplex Radios

“…The exploitation of in-band full-duplex (FD) in wireless communications targets to improve this efficiency by using the same resources to transmit and receive, i.e., simultaneous transmission and reception at the same carrier frequency. Different attractive network concepts have been developed [3]- [6] which exploit FD capabilities in wireless communication radios to improve the capacity and user access. Especially in cellular, access point and mesh networks, FD has the potential to mitigate some fundamental problems like hidden terminals, bandwidth degradation and network latency [7]- [9].…”

Relay-Assisted Multiple Access With Full-Duplex Multi-Packet Reception

“…The received power factor h(i, j) is given by h(i, j) = P tx (i)(r(i, j)) −α where α is the path loss exponent with typical values between 2 and 6. We model the self-interference by a scalar g ∈ [0, 1] as in [36] and [37]. We refer to the g as the self-interference coefficient.…”

Optical Self-Interference Cancellation With Frequency Down-Conversion Based on Cascade Modulator

“…Compared with time division duplex and frequency division duplex, a full-duplex system improves spectrum efficiency and throughput by using the same frequency band on the uplink and downlink [1][2][3], applied in many fields such as 5G communication system, intelligent traffic control, and radar network [4,5]. However, because of the close distance between the transmitting and receiving channels, the strong transmitted signal will interfere with the weak received signal.…”