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 propose the uplink transceiver for Subcarrier Index Modulation (SIM) OFDM in multiuser massive MIMO systems with imperfect channel state information (CSI). In the proposed scheme, the indexes of inactive subcarriers implicitly transmit information bits and the subcarriers activation process is only dependent on modulation order of M-QAM. To mitigate multiuser interference at the...
This paper focuses on uplink transmission of OFDMA system in smart grid with heterogeneous traffic. The subcarrier and power allocation problem is formulated to maximize the throughput while maintaining the delay-constrained (DC) user rate and ensuring the NDC users fairness ratios. Considering these constraints, we propose two reasonable algorithms. The first is based on dual decomposition (DD) scheme,...
In this paper, we investigate a joint subcarrier- relay assignment and power allocation scheme for amplify-and- forward (AF) based two-way multi-relay networks. We formulate a sumrate maximization optimization problem with individual power constraints on each node. The target is to seek a unified optimalscheme for subcarrier-relay assignment and power allocation. The problem turns out a mixed integer...
This paper presents a new joint frame synchronization and frequency offset estimation algorithm for orthogonal frequency division multiplexing (OFDM) systems as a modification to Zhang's method (Zhang et al., 2005). By designing a new training preamble weighted by PN sequence, the timing estimator is improved (at least 3dB with low SNR). By estimating time offset first, the computational load is greatly...
This paper proposes an adaptive QoS management framework for delivering scalable video over OFDM system.The proposed framework has two advantages: One is to admit as many base layer video streams as possible while meeting the hard guarantees for all base layer video streams, the other is to adapt the enhancement layer video streams based on the available residual resources to provide the same quality...
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.