Fundamental Limits of Spectrum Sharing Full-Duplex Multicell Networks

Inband Full-duplex Wireless Communications for Dynamic Spectrum Sharing Systems

Over the last decade, there has been an exponential growth in the wireless demand, driven by an increase in the number of devices, users, and applications. Combined with an increase in the number of connections (due to Internet of things or IoT) and the spike in mobile video, this growth led to a spectrum crisis. To face this problem, various solutions have been proposed, including more cell de...

Spectrum Sharing: Fundamental Limits, Scaling Laws, and Self-Enforcing Protocols

Spectrum Sensing: Fundamental Limits

Cognitive radio systems need to be able to robustly sense spectrum holes if they want to use spectrum opportunistically. However, this problem is more subtle than it first appears. It turns out that real-world uncertainties make it impossible to guarantee both robustness and high-sensitivity to a spectrum sensor. A traditional time-domain perspective on this is relatively straightforward, but t...

Full-Duplex Cooperative Sensing for Spectrum-Heterogeneous Cognitive Radio Networks

In cognitive radio networks (CRNs), spectrum sensing is critical for guaranteeing that the opportunistic spectrum access by secondary users (SUs) will not interrupt legitimate primary users (PUs). The application of full-duplex radio to spectrum sensing enables SU to carry out sensing and transmission simultaneously, improving both spectrum awareness and CRN throughput. However, the issue of sp...

Full-Duplex WiFi Networks

The device in conventional half-duplex WiFi networks cannot perform carrier sensing while in data transmission; thus it suffers from long collision duration. To mitigate this problem, this chapter introduces full-duplex (FD) technology into WiFi networks. A novel CSMA/CD protocol design is first presented for singlechannel FD-WiFi, which facilitates continuous carrier sensing and transmission s...