The increasing demand for large and low cost wireless coverage, ranging from campus to city wide areas, has motivated a high interest in multihop communications with Wireless Mesh Networks (WMN) based on IEEE 802.11s as the most recent and significant standard. Channel Assignment (CA) is a mechanism which selects the best channels for an individual wireless node or the entire network aiming to ...

Channel Assignment (CA) has emerged as a new research area due to the rising commercial deployments of multi-radio multi-channel wireless mesh networks today. This paper presents an indepth survey of the state-of-the-art CA approaches. Firstly, the key design issues for the CA approaches are identified. Secondly, a classification of the CA approaches that captures their essentials is proposed. ...

Recently, several advanced multi-antenna radio communications technologies have emerged to meet the increased capacity demands in wireless multiuser networks. Despite their great potential, the extent of these techniques’ practical applicability still remains questionable, since they have to face either backhaul limitations or cost and hardware constraints. In this paper, we propose a new syste...

In this paper we analyze the adverse effects of Adjacent Channel Interference (ACI) on 802.11 with a focus on new 802.11n standard. ACI is causing problems that are related to the carrier sensing mechanism in 802.11. On the one hand, the carrier sensing is sometimes too restrictive thus preventing concurrent transmissions which leads to a variant of the exposed terminal problem. On the other ha...

Spectrum sensing is a key technology in the study of cognitive radios, but its attributes are easily influenced by the channel fading. Compared with singleuser spectrum sensing, multiple-user spectrum sensing can overcome the impacts caused by the fading environment of cognitive radio. Since diversity technology has been proved to provide the system high transmission rate and high link reliabil...

Interference is an important parameter that affects the performance of a network. By reducing interference, the capacity of the network is improved and this leads to an increased efficiency in communication. In this paper we analyze the interference of a robust channel assignment algorithm for multi-radio networks. This study is an extension to a previous work in which a channel assignment algo...

This paper proposes a channel selection scheme for the multiuser, multichannel cognitive radio networks. This scheme formulates the channel selection as the multiarmed bandit problem, where cognitive radio users are compared to the players and channels to the arms. By simulation negotiation we can achieve the potential reward on each channel after it is selected for transmission; then the chann...

As many radio chips used in today’s sensor mote hardware can work at different frequencies, several multi-channel communication protocols have recently been proposed to improve network throughput and reduce packet loss for wireless sensor networks. However, existing work cannot utilize multiple channels to provide explicit guarantees for application-specified end-to-end communication delays, wh...