Measurement and analysis of the error characteristics of an in-building wireless network
Conference proceedings on Applications, technologies, architectures, and protocols for computer communications
Fuzzy and Neural Approaches in Engineering
Fuzzy and Neural Approaches in Engineering
An Adaptive Multirate IEEE 802.11 Wireless LAN
ICOIN '01 Proceedings of the The 15th International Conference on Information Networking
New high-rate wireless LAN standards
IEEE Communications Magazine
Adaptive radio for multimedia wireless links
IEEE Journal on Selected Areas in Communications
An adaptive modulation scheme for simultaneous voice and data transmission over fading channels
IEEE Journal on Selected Areas in Communications
Key management in ad hoc networks using self-certified public key system
International Journal of Mobile Communications
International Journal of Mobile Communications
An enhanced approach to determine connected dominating sets for routing in mobile ad hoc networks
International Journal of Mobile Communications
International Journal of Mobile Communications
OFDM over IEEE 802.11b hardware for telemedical applications
International Journal of Mobile Communications
An intelligent video streaming technique in ZigBee wireless
FUZZ-IEEE'09 Proceedings of the 18th international conference on Fuzzy Systems
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Mobile devices in the IEEE 802.11 wireless local area network (WLAN) have the ability to transmit data frames at one of four transmission rates 1Mb/s, 2Mb/s, 5.5Mb/s and 11Mb/s. This is because the commercial WLAN transceivers are equipped with several modulation schemes. According to the characteristics of the modulation scheme, a higher transmission rate will result in a smaller transmission range and longer time consumption on data frame transmission. If the channel environment is relatively clear and the transmission distance is short, one should choose a higher transmission rate for data transmission to maximise channel utilisation. On the contrary, a lower transmission rate should be selected to minimise the frame loss and frame error probabilities if the bit error rate is high. Therefore, the problem of choosing a proper transmission rate to accommodate a varying environment is a new and valuable problem in the wireless LANs. To our knowledge, it is very difficult and impractical to formalise an indoor environment since the channel status is quite unstable and unpredictable. Instead, we propose an adaptive rate controller (ARC), which employs the powerful fuzzy set function, for intelligently selecting the transmission rate for frame transmissions. This fuzzy control function refers the received signal strength indicator (RSSI), the frame error rate (FER) and the medium access control (MAC) delay to make a correct decision. Simulation results demonstrate that the proposed fuzzy controller indeed enhances the network throughput and the access delay.