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 letter, we derive a low-complexity channel estimation scheme for multiple-input multiple-output multiband orthogonal frequency division multiplexing ultrawideband (MIMO MB-OFDM UWB) system over spatially correlated channel. More precisely, we drive a linear minimum mean-squared-error (LMMSE) channel estimation algorithm. Then, an optimal low-rank LMMSE channel estimation method based on low-rank...
This paper explores the potential benefit of recently proposed spectrally-efficient frequency-division multiplexing systems (SEFDM), when compared to traditional orthogonal frequency-division multiplexing (OFDM) systems. First, the considered SEFDM channel model is described, then we obtain an expression for the capacity of this channel in case of un-precoded transmission. We evaluate the channel...
A unipolar orthogonal frequency division multi-plexing (OFDM) technique called flipped OFDM (Flip-OFDM), is suitable for intensity modulation and direct detection (IM/DD) channel which needs the transmitted signal to be real and positive. Flip-OFDM uses two consecutive OFDM subframes to transmit the positive and negative parts of the signal, respectively. In the conventional receiver, only the difference...
In this paper, we critically compare the performances of bulk, per-subcarrier and combined selection schemes in super dense networks. Specifically, their outage and contention probabilities are critically appraised. To analyze the effects of outage and contention together, a performance parameter termed the bulk gain factor is defined and employed. Finally, we find that although the bulk selection...
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.