Multimedia services such as Web browsing, video on demand, and IP telephone delivered to the office and home by wired network systems such as optical fiber systems and ADSL systems are now very popular. This popularity increases the demand for more powerful technologies to provide radio access such as high data rate, QoS controlling. The 3rd generation wireless system already has the ability to...

A multiple-input multiple-output (MIMO) system for trans-horizon radio communications within the high-frequency (HF) band (3 to 30 MHz) is presented. The diversity of transmitted polarizations is proposed as an alternative to spatial diversity in order to limit the aperture of antenna arrays at both ends of the radio link. In a theoretical step providing the estimation of capacity gain for diff...

Engmcenng, Nnlronol Unrversuy o f Slngupore. ublic cellular radio systems are less than two decades old. The concepts of cellular radio are much older, rooted in the O OS, when technology was far too immature to support such complex systcms. There are two main components in mobile radio systems.Theradiointerface,whichallowsuserstowander while communicating via radio from a mobile station (MS) t...

In an electron-spin two-level system a bichromatic radiation field, consisting of a transverse microwave field and a radio frequency field oriented parallel to the static magnetic field, can induce multiple photon transitions of the type smw + +kprf, with the photons smw + and prf absorbed from the microwave and radio frequency fields, and k being an integer. The two-level spin system may becom...

A new programmable radio has been designed by ITT and in a companion paper [1] we describe new channel-access protocols that are specifically designed for this radio. The protocols described in the companion paper support a network organization in which all the radios are within communication range. In this manuscript we suggest some extensions to the waveform and the channel-access protocol th...

We propose demonstrating an IEEE 802.11ah wireless local area network (WLAN) prototype that is configured as a self-contained machine-2-machine (M2M) wireless sensor system. Because the IEEE 802.11ah protocol standardization is under way, no commercial-off-the-shelf (COTS) IEEE 802.11ah Wi-Fi product is available yet. However, the proposed prototype has the potential to solve this issue and all...

This thesis considers the statistical analysis of the mobile radio propagation channel and certain functions of it. First, mutual information of the fading multiple-input multiple-output (MIMO) wireless channel is analyzed. Specifically, an approximate distribution of mutual information for Rayleigh fading MIMO channels as well as an upper bound for the ergodic mutual information for Rician fad...

Current rates of demand for radio cellular services will soon reach the saturation point of the actual cellular infrastructures. Thus, spectral bandwidth-saving multiple access schemes are necessary to expand the actual networks’ capacity. In the Spatial Division Multiple Access (SDMA) approach, users within the same cell share the same time/frequency channel and the base station receiver explo...

The General Packet Radio Service (GPRS) offers performance guaranteed packet data services to mobile users. A dynamic adaptive guaranteed quality-of-service (QoS) provisioning scheme is proposed over GPRS wireless mobile links via the guaranteed QoS media access control (GQ-MAC) protocol and the accompanying adaptive prioritized-handoff call admission control (AP-CAC) protocol to maintain QoS g...