Design and Characterization of a Full-Duplex Multiantenna System for WiFi Networks

Abstract

In this paper, we present an experimental and simulation based study to evaluate the use of full-duplex as a mode in practical IEEE 802.11 networks. To enable the study, we designed a 20 MHz multi-antenna OFDM full-duplex physical layer and a full-duplex capable MAC protocol which is backward compatible with current 802.11. Our extensive over-the-air experiments, simulations and analysis demonstrate the following two results.First, the use of multiple antennas at the physical layer leads to a higher ergodic throughput than its hardwareequivalent multi-antenna half-duplex counterparts, for SNRs above the median SNR encountered in practical WiFi deployments. Second, the proposed MAC translates the physical layer rate gain into near doubling of throughput for multi-node single-AP networks. The two combined results allow us to conclude that there are potentially significant benefits gained from including a full-duplex mode in future WiFi standards.

Self-interference suppression with imperfect channel estimation in a shared-antenna full-duplex massive MU-MIMO system

“…1, we consider the uplink of a sharedantenna FD massive MU-MIMO system, where a BS is equipped with M antennas and serves K users, each with a single antenna. Like the separate-antenna full-duplex system [23,25], physical isolation can be adopted between the BS antennas to avoid front-end saturation at the receiver, and active analog SI cancellation is used to suppress the SI before the baseband signal processing. We assume that M is much larger than K, i.e., M K. Both the BS and the users are working in the FD mode, i.e., they can transmit and receive signals using the same time- frequency resource.…”

“…Bharadia et al proposed analog circuit domain cancellation methods that can keep a copy of the transmitted signal and subtract it from the received signal [24]. An analog-and-digital hybrid SI cancellation method has been developed by Duarte et al and can provide approximately 85 dB interference suppression [25]. Recently, Ngo et al proposed the loop interference cancellation technique in a separateantenna relay system, where the SI can be suppressed with a large-scale antenna linear processing (LALP) method in a random reflected-path SI environment [26].…”

Interference Aware Full-Duplex MAC Protocols Design and Evaluation for the Next WLANs

“…To further improve the network capability without using more bandwidth, in-band full-duplex capability, i.e., the ability of transmitting and receiving in the same band and at the same time, is propounded as a promising technology by researchers of wireless networks [5][6][7]. The main challenge for implementing full-duplex capability is that a node need to cancel the interference produced by its transmitting while it is receiving packet.…”

Smartbus

“…Wi-Fi [2] network makes use of radio waves to transmit information signals across a network. It consists of a router which is connected to a modem.…”