Interference Impact of Wireless Avionics Intra-Communication Systems onto Aeronautical Radio Altimeters
In this paper an assessment concerning the potential impact of interference caused by transmissions of wireless avionics intra-communication systems onto aeronautical radio altimeter operating co-frequency is presented. The radio altimeter model utilized for the assessment accounts for realistic scattering and antenna characteristics to describe echo signals returned by the Earth surface. It includes a detailed description of […]
Front-end Monitoring of Multiple Loads in Wireless Power Transfer Systems Without Wireless Communication Systems
This paper describes a method for monitoring multiple loads from the front-end of a wireless power transfer system without using any wireless communication systems. A mathematical approach based on scanning the frequency around the resonant frequency has been developed for deriving the load conditions. The proposal requires only information of the input voltage and current only, therefore eliminating the […]
Admission Control Scheme for Service Dropping Performance Improvement in High-Speed Railway Communication Systems
In high-speed railway communication (HSRC) systems, ensuring the continuity of on-going services is one of the toughest challenges, for the existence of influential factors such as frequent handoff event, short time window for handoff, and severe channel distortion, etc. In HSRC systems with limited resources, admission control (AC) is one of the most efficient methods to overcome this challenge and […]
Summary of results in the field of small element antenna arrays for mobile communication systems
Development of the theory and technology of the small element antenna arrays is one of the research areas of the Department of Technical Electromagnetics and Radio communication Systems since 2006. The research is focused on the improvement of the mobile communication systems. Curvilinear antenna arrays are proposed that comprise antenna elements with controllable polarization of radiation, which are located along […]
Spectrum sharing between matrix completion based MIMO radars and a MIMO communication system
Recently proposed multiple input multiple output radars based on matrix completion (MIMO-MC) employ sparse sampling to reduce the amount of data forwarded to the radar fusion center, and as such enable savings in communication power and bandwidth. This paper proposes designs that optimize the sharing of spectrum between MIMO-MC radars and MIMO communication systems, so that the latter interferes […]
Terahertz resonant tunneling diode systems for next generation wireless communication
For low cost and short distance wireless data communication systems in the THz frequency range, resonant tunneling diodes (RTDs) are very promising. To obtain a large signal-to-noise ratio, thus high data rate, the transmitter output power and receiver sensitivity have to be high. In this paper, we discuss how to overcome the limitations of current RTD-based systems for wireless communication […]
High rate communications systems for CubeSats
Small Satellites and especially CubeSat have received significant attention recently. The development of secondary launch systems to provide a reasonably priced ride to space has increased the number of small satellites in orbit. Recent subsystem developments have also supported this revolution. One area that has been slow to develop is high rate communications. Early CubeSat systems were built on the […]
Novel timing synchronization technique for public safety communication systems employing heterogeneous cognitive radio
A novel synchronization technique is proposed for a heterogeneous cognitive radio combining a public safety mobile communication system (PMCS) with a commercial mobile wireless communicationsystem (CMWCS). Since the PMCS is crucial in public safety activities such as search-and-rescue operations, we have implemented a heterogeneous cognitive technique to improve the communicationquality of the PMCS. To combine the PMCS with the CMWCS properly, […]
Atmospheric Attenuation in Wireless Communication Systems at Millimeter and THz Frequencies [Wireless Corner]
This paper intends to give an overview about atmospheric propagation effects affecting millimeter and terahertz (THz) communication systems. The main focus is on attenuation caused by atmospheric gases and liquid water droplets, either in the form of suspended particles into clouds or rain falling hydrometeors. Theoretical aspects about each of them are presented, emphasizing on those that […]
A comprehensive survey of TDD-based mobile communication systems from TD-SCDMA 3G to TD-LTE(A) 4G and 5G directions
TDD (Time Division Duplex) is one of the two duplex modes. TD-SCDMA (Time Division Synchronous CDMA) is the first TDD-based cellular mobile system which is commercialized in wide area and large scale and TD-SCDMA is also the first cellular mobile system which adopted smart antenna technology (also called as beamforming). As the long term evolution of TD-SCDMA, TD-LTE(A) (Time […]
