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 investigate the practical evaluation of multiple-input multiple-output (MIMO) capabilities in latest generation cellular networks. The available rate region is analytically derived for 2 transmitter-receiver pairs, each with 2 transmit and 1 receive antennas, and integrated with an evaluation framework developed within the ns3 simulator. Finally, the resulting model is evaluated...
Recently, intercell interference coordination in het-erogenous networks attracts great attention. This paper presents an analytical framework to evaluate time mute scheme in closed access femto and macro co-existent networks. We use stochastic geometry to model the downlink scenario and derive the coverage probability of indoor macro users and femto users. Considering the selfishness of the owners...
In this paper, we propose a novel additive cancellation signal (ACS) method for sidelobe suppression in non-contiguous orthogonal frequency division multiplexing (NC-OFDM) based CR systems. The key idea of the proposed method is to dynamically add several additive cancellation symbols on both the primary user (PU) subcarriers and the secondary user (SU) subcarriers, to generate the additive cancellation...
Characterizing user access methods in heterogeneous cloud radio access networks (H-CRANs)is critical for performance optimization. Different from the user access in cloud radio access networks, the inter-tier interference from macro base station has a great impact on user access in H-CRANs. In this paper, after considering the inter-tier interference, the ergodic rates of downlink H- CRANs for two...
Allowing cellular operators to offload data traffic to unlicensed spectrum has the potential to significantly increase the capacity of the cellular network systems. This paper considers the spectrum sharing among multiple cellular operators in the unlicensed spectrum. One of the main challenges for this system is how to control the interference between the cellular users and the unlicensed users in...
In this paper, we propose a robust transmission strategy for multi-cell networks equipped with multiple-antenna base stations (BSs) under universal frequency reuse and in the presence of channel estimation error. We propose a distributed optimization scheme, where each BS individually minimizes a combination of its total transmit power and its resulting overall interference inflicted on the users...
Coordinated multi-point (CoMP) is a well-known approach to mitigate interference in cellular systems and, thus, to improve spectral efficiency. On the downside, implementing CoMP comes at a high cost, e.g., regarding backhaul and signal processing. These costs can be reduced when only BSs at the same site cooperate, referred to as intra-site CoMP. However, the capacity gains of intra-site CoMP are...
In this paper, power allocation problem is presented for device-to-device (D2D) communications underlying cellular networks in multi-user scenario. In this scenario, multiple D2D pairs are allowed to share one cellular resource. As a preliminary study, we consider the scenario with only two D2D pairs and propose a power optimization scheme under this scenario. For cellular link and the D2D links sharing...
A user selection algorithm is proposed for MIMO OFDMA systems with interference alignment technology. Based on the concept of the interference alignment technique, the system has to select paired users that would align the co-channel interference signals. Each user would then receive the desired signal without the interference. In this paper, the selection algorithm of the paired users is investigated...
Recently there has been renewed interest in the application of photoplethysmography signals for cardiovascular disease assessment. Photoplethysmography signals are acquired non-invasively using visible and infrared light passed through the finger pulp. Unfortunately, this method commonly suffers from many forms of interference and distortion such as; baseline wander, mains-line interference and random...
Joint optimization of user association, resource allocation and Almost Blank Subframe (ABSF) based enhanced Inter-Cell Interference Coordination (eICIC), on which macro-cells mute for scheduling the pico users, is of great importance to further improve the network performance in HetNets, however, the introduce of ABSF makes analyzing resource allocation extremely difficult because this results in...
In this paper, we evaluate the outage probability and bit error rate (BER) performances of a three terminal full-duplex relaying (FDR) system with non-negligible residual self-interference (RSI). By investigating the signal-to-interference-plus-noise ratios (SINRs) at the relay and the destination respectively, the exact outage probability and BER of decode-and-forward (DF) based FDR system over Nakagami-m...
This paper presents a new method for constructing a conflict graph for D2D communications in cellular systems, which is useful for efficient radio resource allocation for D2D links. The construction is an iterative process which includes a broadcast-and-acknowledgment protocol. The convergence and delay performance of the proposed constructing process is theoretically analyzed. Simulation results...
In this paper, we propose an interference avoidance resource allocation scheme based on graph-coloring algorithm to introduce performance gain using spatial reuse in D2D (Device-to-Device) system. By assigning multiple D2D pairs to a single D2D resource, interference from neighboring D2D pairs is inevitable, which leads to performance degradation. Therefore, we first introduce the feedback method...
This paper analyzes a spectrum reuse scheme based on region division for secondary users in cognitive radio networks with outage constraint of the primary user. The secondary users can reuse the spectrum by sharing the primary user's uplink (UL) frequency resources in the system. With the help of the stochastic geometry, the secondary user reusing the frequency spectrum can be modeled as the probability...
Heterogeneous networks where low power nodes (e.g., femtocells) are employed in addition to existing macrocells have been proposed to cope with increasing data traffic. On the other hand, additionally installed femtocells incur interference against existing macrocells. The interference is particularly severe when the frequency band is shared by both a macrocell and femtocells for the efficient usage...
In this report, we consider an outage probability for full-duplex single-input single-output (SISO) system. In the presence of self-interference, we derive a closed-form expression of outage probability. We consider Rayleigh and Rician fading channels for the channel between two nodes and for the self-interference channel, respectively. We evaluate the outage probability based on different K factor...
Cognitive radio has emerged as a promising paradigm to improve the spectrum usage efficiency and to cope with the spectrum scarcity problem through dynamically detecting and re-allocating white spaces in licensed radio band to unlicensed users. However, cognitive radio may cause extra energy consumption because it relies on new and extra technologies and algorithms. The main objective of this work...
As a promising technology, Device-to-Device (D2D) communication can bring some advantages such as high bit rates, low delays, low power consumption by reusing frequency band with the cellular user equipments (UEs). While at the same time, inter-cell and intra-cell interference is inevitable. In this paper, we propose an algorithm Stackelberg game based to jointly allocate power and resources when...
Heterogeneous network (HetNet) where the macro cells are underlaid with low power node (LPN) has been introduced to HSPA+ to enhance the system performance in a cost-efficient way. But the Uplink and Downlink (UL-DL) mismatch issue caused by applying the heterogeneous deployment will inevitably limit the performance in both uplink and downlink HSPA+ system. To mitigate the UL-DL mismatch effect, E-DCH...
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.