The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In this paper, we investigate the benefits offered by radiation pattern diversity in reconfigurable antenna arrays and place these benefits in context with spatial diversity provided by conventional antenna arrays. These antennas provide pattern diversity that can improve capacity and offers a unique opportunity for antenna system miniaturization for portable wireless devices. We use a common modeling...
The integration and deployment of pattern reconfigurable antenna arrays in real-world wireless systems have been inhibited by the prohibitively high costs of implementation and integration infrastructure. As a result, many research institutions have turned to Software-Defined Radio (SDR) solutions as a cost-efficient alternative. This work discusses various relevant platforms that could be used for...
In this paper, we focus on the characterization of a pattern reconfigurable antenna design for mobile terminals and application in next generation technologies. We use a simple and efficient approach to measure and analyze the envelope correlation of the antenna diversity system. Specifically, we provide an analysis of the effects of mutual coupling and input match on the diversity performance of...
We investigate the benefits of pattern diversity from using reconfigurable antenna arrays relative to conventional non-reconfigurable arrays that use signal processing techniques such as antenna grouping. The performance of various MIMO antenna mode selection algorithms are experimentally analyzed and benchmarked. Our performance evaluation is based on a measurement campaign employing a software-defined-radio...
In this work, we study and analyze the performance of physical layer algorithms for adaptive multiple input-multiple output orthogonal frequency-division multiplexing (MIMO-OFDM) wireless systems that employ a new class of adaptive antenna systems known as reconfigurable antennas. These antennas are capable of adaptively modifying their radiation characteristics and thus leverage pattern diversity...
In this paper, the design of a pattern reconfigurable antenna for applications that operate in the WiMAX frequency band between 2.5 – 2.7 GHz is presented. The proposed antenna system consists of an array of two reconfigurable microstrip dipoles, whose active elements can be reconfigured in length using PIN diode switches. The setting of the different switches results in different geometries of the...
The effects of channel fading on application performance is often mitigated through the use of adaptive protocols such as forward-error correction (FEC). We propose an adaptive algorithm that improves the performance of a single application by minimizing data loss and decreasing packet delay. The algorithm accomplishes this task by determining dynamically how to allocate the available resources to...
In this paper, we describe an ongoing initiative to bring a reliable and sustainable healthcare infrastructure through Clinic In A Can (CIAN) and Telemedicine to rural communities in Kajokeji, South Sudan. CIAN is an innovative, self-contained medical clinic built in a shipping container and deployed, ready for use, anywhere in the world to provide an emergency healthcare infrastructure. While, Telemedicine...
Data rates and channel capacity in MIMO-OFDM wireless systems can be improved through the use of Adaptive Modulation and Coding (AMC) and pattern reconfigurable antennas. In this paper, we propose a Spatially Adaptive Modulation and Coding (SAMC) scheme that operates in two stages. In the first, it searches for the optimal antenna configuration. Then, the technique applies AMC based on the post-processing...
Bit rates in flat-fading OFDM wireless systems can be improved through the use of Adaptive Modulation and Coding (AMC). In this paper, we propose two practical, efficient link adaptation algorithms that use fixed link tables defined by SNR ranges for supported spectral efficiencies. The purpose is to design non-iterative algorithms with acceptable performance and reduced computational complexity relative...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.