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Journal of Information Science and Engineering, Vol. 36 No. 4, pp. 689-707

Taichi: Signal Dodging and Interference Guiding to Enhance Data Transmission

1School of Information Science and Technology
Northwest University
Xi'an, Shaanxi, 710127 P.R. China
E-mail: simple_xly@126.com

2School of Cyber Engineering
4School of Economics and Management
Xidian University
Xi'an, Shaanxi, 710126 P.R. China
E-mail: {zli; yxu}@xidian.edu.cn; luzhen0320@gmail.com

3Center for Cybersecurity Research and Development
National Institute of Informatics
Chiyoda-ku, Tokyo 101-8430, Japan
E-mail: jliu871219@gmail.com

With the rapid development of wireless technologies, interference has become a main impediment to network performance, making interference management (IM) a critical issue that warrants a thorough investigation. In this paper, we propose a novel IM technique, called signal dodging and interference guiding (SDIG). With this method, we first intellectually move the data transmission away from the interference, which we call signal dodging, hence can partially avoid the influence of disturbance to the desired signal. Then, we employ existing IM method, including zero-forcing (ZF) reception, interference alignment (IA), interference steering (IS), etc., to further eliminate the impact of interference on the interfered receiver (Rx) via nullifying the disturbance (using ZF) or guiding/adjusting the interference to be orthogonal to the desired transmission (with IA, IS, etc.). The SDIG consists of two-phase processing, the first one is modifying the desired signal, and the second one is mitigating the interference. This is similar to the idea of Taichi in that both involve the actions of passive defense and active attack. Therefore, we also use the term Taichi as an equivalent for SDIG. Our in-depth analysis and simulation have shown that with the proposed scheme, the spatial domain communication resource of the interfered transmission-pair can be properly and efficiently utilized, thus both the interfered user's and the system's spectral efficiency (SE) can be significantly improved.

Keywords: interference management, heterogeneous networks, signal dodging, interference guiding, spectral efficiency

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