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In this paper we investigate the possibility to reconstruct the energy and direction of cosmic rays using a network of radio detectors. Measurements are influenced by the properties of the detection chain therefore its behavior is briefly discussed here. We present the response of the detection chain to radio pulses generated by cosmic particles with different characteristics.
As compared to uncoded unitary space-time modulation (USTM), channel coded USTM has received increased attention for its large coding gain. However, low-density parity-check (LDPC) coded USTM has only received limited attention. This paper proposes a scheme of combining LDPC code with USTM for noncoherent MIMO communication system over Rayleigh flat fading and additive white Gaussian noise (AWGN)...
Network selection is a key problem when a user faces multiple available wireless networks. Especially, this problem becomes more complicated when multiple users share multiple wireless networks due to the interaction and competition among users. Most existing works on this multiple networks sharing problem assume that users have the same utility functions, which neglect the fact that users may have...
An inherent problem of Fast TCP with delay-based congestion control algorithms is pointed out in this paper. The problem is, if the actual round-trip-time is inaccurately estimated by base RTT, for certain flows relative to other concurrent flows, this will subsequently result in an unfair share of the resources. A smooth function of RTT with exponential weighted by ARMA models was designed in this...
This paper studies the traffic overload control issue in the new generation electric communication network. We propose an energy-efficient traffic overload control algorithm based on genetic algorithm and hybrid particle swarm optimization. We simultaneously consider the traffic overload control and energy efficiency in the soft-switch server of new generation electric communication networks. Then...
Spectrum sensing in a wideband regime for cognitive radio network (CRN) faces considerably technical challenge due to the constraints on ADCs, especially in the presence of primary user emulation attack (PUEA) where some malicious users try to impersonate the primary user (PU) to prevent other secondary users (SUs) from accessing the idle spectrum. To address this issue, an eigenvalue-based compressive...
This paper analyzes the polling principle of IEEE802.ll PCF, and researches on the key parameters such as the system of the average queue length and average waiting time. In this paper, it presents a new dynamic polling access protocol based on priority (DPQWMAP protocol). The simulation results show that the protocol reduces the average waiting time of the whole system by the cluster head dynamically...
An IEEE 802.11 station may become congested and experience high packet delay and possible catastrophic packet loss because it cannot win sufficient bandwidth. A channel selection algorithm allows the congested station to find another channel which has sufficient available bandwidth in order to transmit its packets without congestion. In this paper, we propose an autonomous channel selection algorithm...
Partially overlapped channels (POCs) are believed to be helpful in further eliminating interference and improving network throughput, but the interference between POCs is more complicated than that of orthogonal channels (OCs), so traditional routing metrics specifically designed for wireless mesh networks (WMNs) using OCs are not suitable for WMNs using POCs. In this paper, we propose a load and...
In this paper, we propose an efficient routing algorithm based on AODV for the Mobile Hybrid Wireless Networks (MHWNs), which consists of the mobile ad hoc networks (MANETs) and an infrastructure wireless networks (such as cellular networks). In MANETs, the performance of the networks has been greatly challenged by the mobility from nodes and link state changes, while the link in cellular networks...
The reconfigurable fault-tolerant routing algorithm in Mesh Topology Structure which belongs the field of network on chip has a feature, which is that the method achieves fault tolerance by using north last turning model and less-stored routing list. The reconfigurable fault tolerance routing algorithm has a series of merits: practical convenience, high fault-tolerance performance, low cost and little...
The algorithm is developed for choosing the most appropriate route with the help of dynamic routing table. The research direction of network-on-chips (NoC) is essential. The aim is to control the congestion which would cause very serious consequences.After NoC's wide application in variety of systems, how to improve the speed of communication among chips, which means how to control congestions effectively,...
Content Centric Network is a clean-slate future Internet architecture, which is centered around content distribution. The In-network caching is the main feature of the new network paradigm. However, the default strategy which leaves cache everywhere in CCN results in serious cache redundancy among neighbor nodes. In this paper, we propose a Neighbor Cooperation Caching Strategy to tackle the redundancy...
In the circumstances of GEO (geostationary earth orbit) satellites cooperation, a practical and efficient traffic load balancing method is presented in this paper. The mathematical analysis and simulation show that the proposed method improves the overall balance of satellite communication systems and expands the single GEO satellite transmission ability by lowering the transmission delay and increasing...
Concurrent multipath transfer (CMT) can improve data throughput, bandwidth resource utilization and system robustness. Whereas, CMT also leads to serious reordering problem, especially in heterogeneous wireless networks. Since more than one path are used, an efficient CMT scheduling algorithm is needed at the sender. For existing packet scheduling, packet's rate of entering the sender queue is usually...
Wireless Body Area Network (WBAN) has been considered for applications in medical, healthcare and sports fields. Although there are several protocols for wireless personal area networks, specific features and reliability requirements in WBAN bring new challenges in protocol design. An appropriate control scheme in the MAC layer can make a significant improvement in network performance. Based on traffic...
Multicast congestion control is essential to avoid congestion collapse and ensure fair competition in bandwidth with unicast. This paper presents a classification on existing multicast congestion control schemes. A main contribution in this paper is that we characterize multicast congestion control by a parameters tuple {traffic regulation, group management, data layering and coding, router function}...
Available network bandwidth is one of the important indicators for evaluating network performance. However, the measurement accuracy of many measurement tools is lack of effective evaluation under different network environments at present, resulting in the shortage of selection basis. This study constructed a scalable network measurement platform to analyze and evaluate the main network measurement...
In this paper, we study the performance of the coordinated distributed scheduler in IEEE 802.16 mesh mode. In the coordinated distributed scheduler, the three-way handshaking procedure, which is used for data slot scheduling, is a vital important part of the network performance. In this paper, the three-way handshaking time is newly defined from the reasonable aspect of engineering practice, arguing...
Network virtualization is considered as the trend of the future Internet and the solution to the growing ossification of Internet nowadays, because it is more flexible and manageable by allowing multiple heterogeneous virtual networks to coexist on a shared infrastructure. The survivability of virtual network is meaningful. In this paper, we propose a solution of survivable virtual network embedding...
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