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.
Physical layer security in the presence of passive eavesdroppers (i.e., the eavesdroppers' channels are unknown to the transmitter) in correlated channels is addressed. The majority of the literature with passive eavesdroppers assumption focus on uncorrelated channels and random artificial noise (AN) generation in the null space of the legitimate channel. This paper targets joint optimization of the...
This paper deals with the optimization of the multiuser (MU) pilot design for orthogonal-frequency-division-multiple-access (OFDMA) systems perturbed by the I/Q imbalance (IQI) impairment. For the frequency-selective Rayleigh propagation channels, the proposed approach exploits the decoupled direct and image channels, and the knowledge of the effective channel statistics to realize dual linear-minimum-mean-square-error...
In this paper, we investigate the capacity of the multi-user (MU) channels with the single-carrier frequency-division-multiple-access (SC-FDMA) transceivers using widely linear equalizers (WLE) to counteract front-end I/Q imbalance (IQI) issues. When the erroneous channel knowledge is available at the equalizer, it is shown that the mutual information could be expressed as a function of the eigenvalues...
This paper considers the conventional eigenvalue decomposition (EVD) based and widely linear (WL) channel estimations to alleviate inherent pilot contamination problems in multi-cell multi-user massive multiple-input multiple-output (MU-Massive-MIMO) systems. Both channel estimation schemes utilize the asymptotic orthogonality between the propagation vectors of different users which would be true...
This paper presents a blind method to resolve imbalances between I and Q paths in low-IF receivers. In particular, we investigate the mismatch arising from the coefficient variation of the complex filters that leads to the frequency-selective imbalance problem. The key point in the proposed novel DSP-based solution is the transformation of the signals to frequency domain and the estimation of the...
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.