Licensed-assisted access (LAA), which conveys data information via both licensed and
unlicensed bands through spectrum aggregation, becomes a promising solution to enhance …

In two-tier networks consisting of a macrocell overlaid with femtocells in cochannel
deployment and closed-access policy, spatial reuse is achieved at the price of severe …

In this paper, we consider the medium access control (MAC) protocol design for random
access cognitive radio network (CRN). Based on asynchronous spectrum sensing technique …

To accommodate spectrum access in multichannel cognitive radio networks (CRNs), the
channel-assembling technique, which combines several channels together as one channel …

Cognitive radio (CR) systems are potentially capable of mitigating the spectrum shortage of
contemporary wireless systems. In this paper, we provide a brief overview of CR systems …

Cognitive acoustic (CA) is emerging as a promising technique for environment-friendly and
spectrum-efficient underwater communications. Due to the unique features of underwater …

License-assisted access LTE (LAA-LTE) has been proposed to deal with the intense
contradiction between tremendous mobile traffic demands and crowded licensed spectrums …

Resource allocation plays a critical role to enhance the performance of cognitive orthogonal
frequency division multiplexing (OFDM) network. However, due to lack the cooperation …

The tradeoff between the interference to primary users'(PUs) and secondary users'(SUs)
throughput is of great importance in cognitive radio networks. Both imperfect spectrum …

This paper presents a frequency bandwidth reconfigurable antenna capable of gradually
varying its bandwidth from 43 to 76% by keeping the lower band limit fixed and varying the …