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Optimal bandwidth and power allocation is performed in a wireless clustered ad hoc network (CAHN) when Type-I Hybrid Automatic Repeat reQuest (HARQ) is used at the link layer along with an Orthogonal Frequency Division Multiple Access (OFDMA) scheme under individual data rate constraint. The considered network topology imposes the resource allocation manager to know only the channel state information...
In this paper, the problem of sum-rate maximization with Quality of Service (QoS) for a multi-cell multi-user uplink is addressed. The problem is formulated as a Mixed Integer Nonlinear Programming (MINLP) problem with non-convex feasible region and hence is difficult to solve. A primal-dual infeasible-interior-point method (IIPM) is applied to jointly optimize resources. With this method, simultaneously...
Joint power and admission control (JPAC) aims at supporting a maximum number of links at their specified signal to interference plus noise ratio (SINR) targets while using a minimum total transmission power. Almost all of the existing works on JPAC assume perfect channel state information (CSI). However, this assumption generally does not hold true. In this work, we consider the chance (probabilistic)...
We propose a decentralized beamforming design for weighted sum rate maximization with quality-of-service constraints based on primal decomposition of the corresponding centralized problem. The considered system consists of multiple coordinated multi-antenna base stations (BS) serving multiple users each with multiple receive antennas. The considered rate maximization problem is known to be NP-hard...
A stochastic implementation of the Davidon-Fletcher-Powell (DFP) quasi-Newton method to minimize dual functions of optimal resource allocation problems in wireless systems is introduced. While the use of dual stochastic gradient descent algorithms is widespread, they suffer from slow convergence rate. Application of second order methods, on the other hand, is impracticable because computation of dual...
Mobile cloud computing is offering a very powerful storage and computational facility to enhance the capabilities of resource-constrained mobile handsets. However, full exploitation of the cloud computing capabilities can be achieved only if the allocation of radio and computational capabilities is performed jointly. In this paper, we propose a method to jointly optimize the transmit power, the number...
We address the linear precoder design problem based on chance constrained quality-of-service (QoS) power minimization in the vector broadcast channel (BC). We divide the problem into a two step optimization that separates the precoder design from the power allocation. For the power allocation, we propose a map that fits into the framework of standard interference functions. Therefore, we can compute...
Knowing a user's next cell allows more efficient resource allocation and enables new location-aware services. To anticipate the cell a user will hand-over to, we introduce a new machine learning based prediction system. Therein, we formulate the prediction as a classification problem based on information that is readily available in cellular networks. Using only Channel State Information (CSI) and...
The spectral efficiency of wireless networks can be significantly improved by wisely integrating multiple services at the physical layer. Here, we consider physical layer service integration in bidirectional relay networks, in which a relay node establishes a bidirectional communication between two other nodes using a decode-and-forward protocol. In the broadcast phase the relay efficiently integrates...
In this paper we consider a four-way relaying multiple-input multiple-output (MIMO) scenario, where each of the two Mobile Stations (MSs) has a two-way connection to the same Base Station (BS), while each connection is through a dedicated Relay Station (RS). The RSs are placed in such a way that one RS and the terminals associated with it do not interfere with the other RS, and vice versa. We introduce...
This paper deals with distributed decision map selection of individual relay wireless network coding (WNC) (a.k.a physical layer network coding (PLNC)) operation in a multi-source network scenario. Communication network consists of several independent selfish source nodes, one layer of relay nodes (named a cloud) and a set of destinations. Relays support the source to destination communication. Connectivity...
In this paper, assuming a bidirectional network, the performance of two-way half-duplex (HD) relaying systems based on physical-layer network coding is compared with oneway full-duplex (FD) relaying schemes. Specifically, the outage probability and system throughput of the considered schemes are investigated. Our results show that unidirectional FD relaying can outperform bidirectional HD relaying,...
We consider a distributed detection problem where two nodes, or decision makers, observe a common source and aim to decide on one of several hypotheses. Before making their individual decisions, the nodes are allowed to communicate over rate-constrained links, through a bidirectional relay. We show that if the rate of the common relay-to-node link is greater than or equal to the rate of the individual...
In this paper, bi-directional communication between K node pairs is considered. Each node has N antennas and wants to transmit d data streams to its communication partner. Q relays with R antennas each aid in their communication. Two-way relaying is assumed. The nodes do not have transmit channel state information and the relays do not have enough antennas to spatially separate the data streams. Taking...
In this paper, we do performance analysis of the cooperative HARQ protocol in a wireless adhoc multihop network employing spatial ALOHA. We model the nodes in such a network by a homogeneous 2-D Poisson point process. We study the tradeoff between the transport capacity submetrics inherent in the network when using cooperative HARQ protocol and opportunistic routing by optimizing the transport capacity...
In wireless networks, advanced communication techniques exploited network coding and cooperative schemes have attracted considerable attention as ways to enhance power efficiency as well as to achieve high throughput and spectral efficiency. In this paper, we consider a cooperative wireless network with two nodes and one base station, and investigate the impact of using nonbinary network coding. We...
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