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.
Owing to its potential of enhancing the network performance and to the large number of applications it can be suited for, wireless network coding is attracting a lot of interest from both the academic and the industrial communities. A common assumption in most of the literature is the presence of a single intermediate relay node where the network coding operation takes place. However, in an actual...
Future cellular networks are expected to provide significantly higher capacity than today's systems. To support this higher capacity a denser deployment might be necessary. An alternative way is to deploy Multiple-Input-Multiple-Output (MIMO) base stations (BSs), called advanced BSs, so that the system capacity is improved without increasing the BSs density. This paper compares Single-Input-Single-Output...
In this paper, we introduce a new transmit architecture that employs a 2-dimensional Fourier Transform and a 2-dimensional cyclic prefix (2D-CP) at the base station. In addition, the proposed scheme incorporates relay nodes that forward the received signals with one OFDM symbol delay. The new method introduces artificial frequency, time and spatial diversity, and unlike previously proposed relaying...
Network coding has recently attracted a lot of interest from the research community, mainly due to its simplicity of application and the large number of applications it can be suited for. Research in network coding started on wired networks, but the researchers soon came to realize that the inherent properties of the wireless medium render it a fertile ground for the application of network coding,...
In an OFDM system, known symbols referred to as pilot are transmitted across the time-frequency plane for the receiving device to estimate the channelpsilas time-frequency response in order to perform coherent demodulation of data symbols. The placement of these pilot symbols largely falls into two categories, namely, the regular and irregular patterns. Inspired by synchronization techniques used...
User-specific, linear precoding is used extensively by almost all existing and emerging wireless MIMO standards [1], [2], [3], [4]. With user-specific, linear precoding, the data symbols to be transmitted to each user are passed through a linear transformation before being sent to the transmit antennas, and a different precoder is used for each user depending on his/her channel. For example, with...
A cooperative communication scheme referred to as relay cyclic delay diversity (RCDD) is presented in this paper. The scheme is based on a set of distributed relay nodes (RNs) with each node associated with a certain cyclic shift in order to generate artificially multi-path diversity and equivalently frequency diversity. RCDD is an open loop scheme and the user terminal (UT) only needs to estimate...
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.