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.
It is a challenge today to set up novel data intensive services at UHF frequencies because the scarce spectrum is divided into a plethora of narrowband channels that have been allocated by regulatory agencies to different nations. Therefore, increasing the spectrum to be used for a single service is not a viable strategy. As an alternative, multiple-input-multiple-output (MIMO) could be a candidate...
The limited available spectrum for ultrahigh frequency (UHF) communication via geostationary satellites is entirely occupied, and the throughput cannot be increased with conventional techniques. However, multiple-input–multiple-output (MIMO) communication can further enhance the data rate for fixed bandwidth and transmit power. This letter presents measurement results of the mobile MIMO UHF channel...
If multiple-input multiple-output (MIMO) satellite communications (SATCOM) systems use spatial multiplexing instead of polarization multiplexing, the channel capacity depends on the geometrical conditions of the antenna setup. This theoretical result is proven and confirmed for the first time by a true-MIMO measurement campaign. We utilize two Ku-band satellites and a ground station with two antennas...
An analysis on the secrecy capacity of a primary MIMO satellite link as compared to that of an eavesdropper is provided. It is presumed that the information sent by the satellite Alice is addressed to a limited number of ground terminals Bob but could potentially be eavesdropped by an unlimited and unknown number of malicious ground terminals Eve that are located within the satellite footprint. In...
A multiple-input multiple-output (MIMO) satellite communications system for fixed-satellite services (FSS) is considered. The MIMO Line-of-Sight (LOS) satellite channel is optimized to achieve maximum spectral efficiency. This requires an orthogonal MIMO channel matrix, ending up with large antenna spacing of the ground terminal antennas. As the main drawback, considerable propagation delays between...
In this paper, we investigate the benefits of uniform circular arrays (UCAs) as an alternative antenna deployment to uniform linear arrays (ULA), which are commonly applied for multiple-input multiple-output (MIMO) systems. We consider a MIMO satellite link with focus on the Line-of-Sight (LOS) signal component of the MIMO channel between two geostationary satellites and a mobile earth terminal equipped...
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.