Wi-Fi Direct based Smart Set-up (WDSS) in Lighting Systems

The Wireless Lighting Control System has drawn intensive attention in the recent years due to the potential for huge cost savings as well as increased convenience. Commonly seen Wireless Lighting Control Systems utilize Zigbee, KNX and Z-WAVE; whereas little attention has been given to Wi-Fi because of unsolved limitations. The purpose of this...

Future home networks: Connectivity in 60 GHz Home Networks

Currently, common frequency spectrum is densely allocated and this leads to search for alternative frequency bands. 60 GHz band attracts attention for its potential in future communication. It offers globally available, license-free, very large bandwidth for high data rate communication. At 60 GHz frequency band, severe attenuation of the...

A Multi-hop Aware Scheduling Mechanism for HSDPA and IEEE 802.11 Integrated Network

By simulating the integrated networks with multiple gateways and TCP flows, we get the unfairness in the HSDPA and IEEE 802.11 integrated networks. The unfairness has two sources: the HSDPA cellular subnetwork and the IEEE 802.11 subnetwork. A novel scheduling algorithm - Multi-hop Aware Scheduling has been proposed to resolve the unfairness...

Gateway Selection Mechanisms for Beyond 3G Multi-hop Cellular Networks

Nowadays, there are a host of demands on the Internet applications (IP based multimedia applications) coming into people’s life. How to access the Internet and get these application services more quickly and better becomes gradually critical for people to meet their demands. However, the existed two technologies: the third generation (3G)...

Antenna Beamforming for a 60 GHz Transceiver System

The main target of a 60 GHz transceiver system is to obtain data rates close to gigabits per second (Gbps) over short distances. The 60 GHz suffers from severe pathloss, inter-symbol interference (ISI) and a limited link budget. In order to improve the link budget, beamforming techniques are utilized. Antenna beamforming, i.e., combining signals...

Improving ZigBee Networks Robustness with Multi-channel Capability

Based on IEEE 802.15.4, ZigBee is developed for low-power and low-data-rate wireless communication and it is building up remarkable position for wireless sensor network (WSN). As ZigBee is using the 2.4GHz Industrial, Scientific, and Medical (ISM) unlicensed frequency band, coexistence issues arise as there are also other wireless technologies...

Free-space Emulator of 60GHz Directional Antenna Equipment

Design and Implementation of a Wireless Sensor Network Testbed

Wireless Sensor Network (WSN) is becoming a more and more popular research area since its emergence. Many WSN researches rely on practical experiments in real wireless networks. However, to setup and conduct such an experiment is always cumbersome and time-consuming. So in this thesis, we design and implement a WSN testbed to solve the problem...

Transmission Power Adaptation Using Link Quality Estimation In IEEE802.11

Nowadays, energy saving for wireless communication is more important than before. Lots of wireless devices are battery operated, like devices used in WLAN, ad hoc mode, sensor network, cellular network and so on. For example, Ad hoc networks which are composed of these wireless mobile devices can automatically establish peer to peer...

A Framework For Coping With Intra-Node Adjacent Channel Interference In Multi- Channel Multi-Radio Mesh Networks

Typically, in a wireless data network, all devices use the same channel (i.e. the same frequency) so that they can easily communicate with each other. However, as node density increases, the throughput share of each device decreases due to contention of the wireless medium. It seems that the capacity problem in wireless mesh networks can be...