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In traditional automatic retransmission request (ARQ) based wireless broadcasting (WBC) systems, one lost packet is retransmitted per slot to guarantee the correct reception of each packet, which leads to low spectrum efficiency. In this paper, we propose an Ave-Max-Min Network Coding (NC) based WBC protocol. Specifically, to reduce the overall number of retransmissions, lost packets of different...
The key obstacle to exploiting orbital angular momentum in wireless communication is the influence of axis misalignment on detection side. This paper summarizes the effects of axis misalignment quantitatively and presents novel automatic methods to overcome the obstacle under the ideal (noiseless) condition. Numerical results in the far field demonstrate the effectiveness of our approach to make orbital...
Dynamic Spectrum Access provides novel solutions to improve spectral efficiency. Wireless Service Providers (WSPs) are allowed to transmit data over their exclusive licensed bands and multiple available unlicensed bands. The critical challenge is how to allocate power rationally to prevent severe interference between coexistent users. We formulate the problem as a Users Coexistence Game (UCG) and...
Femtocells have great potential to enhance home cellular access and improve macrocell network efficiency by offload local traffic. However, dense deployment imposes critical challenges to resource management (i.e., interference mitigation and sub-channels allocation).In this paper, to formulate this resource management of femtocell, we propose broker based many-to-many bipartite matching game and...
In co-channel deployment of macrocell and indoor femtocells, almost blank subframe (ABS) is considered as an effective enhanced inter-cell interference coordination strategy for mitigating downlink cross-tier interference. In this paper, a novel distributed dynamic ABS ratio setting scheme is proposed for dense residential femtocell deployment with closed subscriber group configuration. Both the overall...
Wireless data broadcast is usually used to disseminate the public information to considerable clients in wireless environment. Based on the development of mobile device, some mobile devices can simultaneously use multiple antennae to process some operations. In this paper, we commit to study data retriveal schdeuling problem in wireless data broadcast, which mobile device has multiple antennae and...
In the future B3G/4G communication systems, it is of broad prospect to implement the femtocell in the enterprise offices or other public places. However, the femtocell operations under such environment are significantly different from the macrocell as well as the usual residential femtocell, and the configuration and optimization are more complex. Although there have been a few works studying the...
In order to meet the requirement of wider bandwidth in IMT-Advanced, carrier aggregation (CA) is introduced by 3GPP to support bandwidth up to 100MHz in its LTE-Advanced standards. An LTE Rel.10 UE can aggregate up to 5 component carriers (CCs) simultaneously, but may be assigned only part of the total available CCs depending on its capability or traffic load. Thus, a proper CC selection method is...
In cognitive radio (CR) networks, cross-layer design is an important issue since the behavior of one protocol could affect the performance of others. However, for the energy-constraint CR networks, the previous works mostly focus on maximizing the throughput in physical or transport layer, rather than the energy efficiency of the end-to-end transmission control protocol (TCP). In this paper, we propose...
The content dissemination among mobile users can be solved by self-facilitated mobile ad hoc networks (MANET) in an infrastructure environment. But the devices used to make up the mobile ad hoc networks usually have a limited radio transmission range, sporadic node density and power limitation, which makes MANET become intermittently connected. In this paper we focus on the content delivery problem...
Cooperative communication has been proposed to improve the performance affected by multi-path propagation in the wireless network. Then, coded cooperation is emerging as a promising technology to improve the outage performances. Combining the coded cooperation with opportunistic relaying scheme can minimize the outage probability. In this paper, we propose a multicast cooperation strategy based on...
In order to maximize system capacity in a dual-hop regenerative relay system under certain power cost, the concept of power price is proposed, which is determined by the different fashions of power supply at the nodes, and power cost is defined explicitly. According to the analysis below, the allocation of power cost is determined by the channel gains and power prices, and the system capacity is formulated...
In this paper, heterogeneous services in multiuser multiple-input multiple-output (MIMO)-Relay systems are investigated, where the relays work in amplify-and-forward mode. A utility based adaptive scheduling algorithm is proposed, which aims to maximize user satisfaction as well as system spectral efficiency. Joint optimal carriers and spatial subchannels allocation is considered based on the proposed...
In order to reduce power cost in regenerative relaying system, the concept of power price is proposed, which determined by the different fashions of power supply at the nodes. An algorithm is proposed to minimize the outage probability based on power price, which subjects to the constraint of power cost. Lagrange multiplier maximization method is used to solve this problem. Numerical results show...
In this paper, the inter-cell interference coordination (ICIC) is investigated for the downlink transmission in OFDMA-based multi-cellular systems. The utility function is introduced to balance efficiency and fairness. Firstly, the system model is built based on the resource allocation rules of soft frequency reuse (SFR) and the utility-based optimization problem is formulated. Secondly, the problem...
A new cross-layer urgent bit first (CLUBF) scheduling mechanism is proposed and analyzed in the paper. The proposed algorithm focuses on cross-layer resource allocation scheme for heterogeneous services in orthogonal frequency division multiplexing access (OFDMA) downlink systems. And the CLUBF scheduling mechanism is operated over four steps: (1) traffic mapping: dividing traffic into UB (urgent...
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