Extensive researches on Wireless Sensor Networks (WSNs) have been performed and many techniques have been developed for the data link (MAC) layer. Most of them assume single-channel MAC protocols. In the usual dense deployment of the sensor networks, single-channel MAC protocols may be deficient because of radio collisions and limited bandwidth. Hence, using multiple channels can significantly ...

Extensive researches on Wireless Sensor Networks (WSNs) have been performed and many techniques have been developed for the data link (MAC) layer. Most of them assume single-channel MAC protocols. In the usual dense deployment of the sensor networks, single-channel MAC protocols may be deficient because of radio collisions and limited bandwidth. Hence, using multiple channels can significantly ...

From practical and theoretical viewpoints, performance analysis of communication systems by using information-theoretic results is important. In this paper, based on our previous work on Multiple Access Channel (MAC) and Multiple Access Relay Channel (MARC), we analyze the impact of a relay on the fundamental wireless communications concept, i.e., coverage region of MARC, as a basic model for u...

This paper presents a distributed channel probing scheme for wireless networks. By transmitting a probing signal in a channel and measuring the signal-to-interference ratio (SIR), a wireless node can estimate channel admissibility and predict its required transmission power without fully powering up. The channel probing scheme can be used as part of a distributed channel allocation algorithm, a...

Unlike wired networks, packets transmitted on wireless channels are often subject to burst errors which cause back to back packet losses. Most wireless LAN link layer protocols recover from packet losses by retransmitting lost segments. When the wireless channel is in a burst error state, most retransmission attempts fail, thereby causing poor utilization of the wireless channel. Furthermore, i...

This paper dedicates to exploring and exploiting the hidden resource in wireless channel. We discover that the stochastic dependence in wireless channel capacity is a hidden resource, specifically, if the wireless channel capacity bears negative dependence, the wireless channel attains a better performance with a smaller capacity. We find that the dependence in wireless channel is determined by...

In this paper an overview of the reported parameters of the Ultra Wide Band (UWB) indoor wireless channel is presented. First, an introduction to UWB technology as well as UWB wireless channels is provided. Then, impulse response model for the wireless indoor channel is introduced. The available UWB channel measurements results in indoor environments are consulted and accordingly, the major UWB...

For link packet loss rate, delay and throughput etc. QoS performance analysis in wireless communication systems, queuing analysis based on measuring or estimating models for traffic flow and wireless channel is one of critical technologies. However, the complicated modern wireless communication systems and unreliable wireless channels usually cause accurate wireless channel models very complica...