http://hdl.handle.net/10453/19556 Sat, 25 May 2013 11:52:25 GMT 2013-05-25T11:52:25Z http://hdl.handle.net/10453/19662 Untitled Mon, 12 Mar 2007 22:12:37 GMT http://hdl.handle.net/10453/19662 2007-03-12T22:12:37Z http://hdl.handle.net/10453/19612 Low-cost QoS-enabled Wireless Network with Interworked WLAN and WiMAX Humaira Haffajee.; Chan, H Anthony. The WLAN and WiMAX standards are candidate solutions for a low-cost broadband wireless network. Interworking the two networks, using the network-layer QoS mechanisms of the Next Generation Network, will allow them to complement each other. This paper proposes integrating the WLAN and WiMAX link-layer QoS mechanisms of the NGN to ensure that QoS is maintained over the wireless link. The wireless QoS mechanism in WLAN and WiMAX are analyzed and an integration framework is proposed Mon, 12 Mar 2007 22:05:51 GMT http://hdl.handle.net/10453/19612 2007-03-12T22:05:51Z http://hdl.handle.net/10453/19605 Complex analog correlating pulsed UWB-receiver in realistic 0-1GHz channels Verhelst, Marian.; Dehaene, Wim. The complex analog correlating (CAC) receiver is an excellent candidate for low power, low data rate pulsed UWB communication, but only in ideal AWGN channels. This paper adapts the traditional architecture and acquisition scheme of this receiver for operation in realistic multipath channels. Two schemes are presented: a high performance scheme, and a simpler, but easy to implement and low power scheme. Monte-Carlo simulations illustrate the performance improvement in realistic 802.15.4a (LOS and NLOS) channels. The receiver's power consumption can be traded for performance by tuning the number of resolved path components. The system outperforms the traditional CAC receiver and the transmitted reference receiver in all environments. Mon, 12 Mar 2007 22:05:51 GMT http://hdl.handle.net/10453/19605 2007-03-12T22:05:51Z http://hdl.handle.net/10453/19618 Malicious Code and Spam in Wired and Wireless Environments: Problems and Solutions Joel Sing.; Soh, Ben. Over the last several years digital pests - namely viruses and spam - have reached epidemic proportions, severely impacting the usability of digital communication systems, primarily affecting email. These pests result in increased bandwidth usage, increased operating costs, potential security threats and above all decreased usability. They also have the potential to create Denial of Service attacks, crippling the networks that they infect or target. Whilst to date they have been mostly confined to email, it is becoming apparent that they have the potential to impact digital communications infrastructure of the future. For example, concerns have already been raised with regards to the potential impact of spam on Voice over IP. Spam and viruses have also been appearing within other technologies and communication media, including mobile phone networks and hand held devices. To combat the above mentioned security problems, we propose an email scanning gateway using open source tools, whilst ensuring that the gateway can be readily deployed in a commercial environment. In this paper we present details of the design and implementation, and discuss several possible applications of our proposed system Mon, 12 Mar 2007 22:05:51 GMT http://hdl.handle.net/10453/19618 2007-03-12T22:05:51Z