Summary
International Workshop on Smart Info-Media Systems in Asia
2021
Session Number:RS1
Session:
Number:RS1-4
Expanded Null Beamforming for Full-Duplex MIMO Communication on IEEE 802.11
Kotaro Nagano, Masahiro Kawano, Yuhei Nagao, Hiroshi Ochi,
pp.34-39
Publication Date:2021/9/20
Online ISSN:2188-5079
Summary:
Cancellation of self interference (SI) is an important technology in order for wireless communication system devices to perform full-duplex communication. In this paper, we describe a novel self-interference cancellation using null beamforming by Cooperative MIMO (Multiple Input Multiple Output) for full-duplex wireless communication in IEEE 802.11 network. In addition, we propose a method to perform null beamforming by applying a weight matrix to the legacy preamble part. We evaluate the SI cancellation amount by the proposed method using a field programmable gate array (FPGA) and software defined radio (SDR), and show the experimental results. In the experiment, it is confirmed that the amount of SI cancellation by the proposed method was at least 17 dB. The SI cancellation amount can be further potentiated with more accurate CSI (channel state information) by increasing the transmission power. It is shown that SI can be suppressed whole frame include legacy preamble part.