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 has been well-established that Device-to-device (D2D) communication underlying cellular networks can improve network radio resource efficiency and provide higher transmission data rates to devices in proximity. In this work, we propose a cooperative system model. Three relay selection schemes are compared under such model. The Distance-based Relay Selection considers only distance for optimal relay...
As microwave spectrum becomes increasingly scarce, millimeter wave communication has gained wide attention for its sufficient bandwidth, which is also considered as one of the key technologies in the Fifth Generation (5G) communication networks. Different from microwave, millimeter communication is easy to suffer from the blockages. In order to take advantage of the wide spectrum and avoid the big...
Cooperative relaying is an enhancing technique for Device-to-Device (D2D) communications, which can significantly expend the communication distance and increase the capacity of D2D links. However, it is challenging to balance the probing time for selecting the optimal relay node and the effective transmission time, both of which will affect the overall throughput of D2D transmissions. In this work,...
Abstract-Heterogeneous deployment comprising overlays macrocell and small cells is a promising solution to enhance both system capacity and coverage. Nevertheless, the performance of heterogeneous networks uplink is severely degraded due by cross-layer interference, especially the interference that small cell suffers from the proximate macro UEs (MUEs). In this paper, we propose a Cross-Tier Interference-Aware...
Interference coordination is a critical enabler of heterogeneous networks. In this paper we present a scheduling cooperation scheme that coordinates the resource allocation and user assignment across layers. The proposed scheme focuses on mitigating the interference generated by macro-associated users in the proximity of small cells by exchanging the information of user assignment on the severely-interfered...
We investigate the resource-sharing problem of Device-to-Device (D2D) communications underlaying the cellular network. The performance of D2D communications sharing the u-plink channel of a cellular system is analyzed by first considering a single cell scenario for analytical tractability. Then we propose a position-based resource-sharing scheme for D2D communications underlying cellular system, and...
In co-channel deployments of macro and femto cells, the much higher transmit power of a macrocell base station (MBS) than that of a femtocell access point (FAP) may create a femtocell exclusion region (FER) around an MBS, where reliable femto downlink (DL) services cannot be guaranteed. In this paper, we analyze the DL outage probability (OP) of orthogonal frequency division multiple access (OFDMA)...
Due to considerations of spectrum availability and network infrastructure, existing macrocell networks may have to share the spectrum with overlaid femtocells. In spectrum-sharing macro and femto networks, different transmit powers used by macro base stations (MBS) and femto access points, together with potentially densely deployed femtocells, may create dead spots where reliable coverage cannot be...
Femtocells have been considered by the wireless industry as a promising solution not only to improve indoor coverage, but also to unload traffic from already overburdened macrocells. In spite of potentially excessive interference caused by densely deployed femtocells, macrocells may have to share the same spectrum with femtocells, due to spectrum availability and network infrastructure considerations...
In this paper, we present two novel ARQ schemes for mobile multicast, which utilize packet-combining to reduce the number of retransmissions. The spectral efficiency of these multicast ARQ schemes are optimized jointly with adaptive modulation and coding (AMC) under specific QoS constraints, and numerical results show that significantly gains can be achieved comparing to schemes without packet-combining...
Aiming at the cyclostationary property of most communication signals, two cyclostationary algorithms are analyzed in detail, which are obtained by using the Lagrange multiplier method based on different combinations of optimization objectives and constraints, and a novel adaptive implementation method called forgetting factor method is proposed to improve the anti-jamming capability in weak signal...
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.