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Collaborative spectrum sensing (CSS) consumes a significant amount of energy during sensing and reporting the sensing results. Such an issue becomes a challenge in the multi-channel systems. In this paper we propose two different energy-efficient CSS schemes, namely, Reduced-Energy Sensing Scheme (RESS) and Reduced-Energy Reporting Scheme (RERS). In RESS, the channels that have been identified as...
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 order to solve the rbuf blocking in concurrent multipath transfer, firstly, this paper analyzes the reason for receiving buffer blocking and the disadvantages of traditional retransmission policies. And then, it proposes an improved retransmission policy — RTX-CR (retransmission-congestion window and RTT), which can reduce rbuf blocking. The simulation indicates that the retransmission policy can...
Cognitive radio (CR) technology is a promising solution to the spectrum scarcity problem. Due to the spectrum varying nature of CR networks, unlicensed users are required to perform channel hopping to realize blind rendezvous. However, blind rendezvous can easily cause deadlock in the network. Moreover, due to the nature of blind rendezvous, a deadlock cannot be detected by either the suffering users...
This paper focuses on modelling and performance evaluation of an Intermodal Freight Transport Terminal (IFTT), the rail-road inland terminal of a leading Italian intermodal logistics company. The IFTT is regarded as a discrete event system and is modelled in a timed Petri net framework. By means of suitable performance indices, we simulate the Petri net model and evaluate the operational performance...
This paper presents an analysis of the factors affecting coverage and capacity estimation in cellular networks of third generation (3G) technology using wideband code division multiple access (WCDMA). Particularly in WCDMA systems, the main source of interference by coverage is the overlapping between cells, affecting the capacity of system. To analyze the factors affecting the capacity of a WCDMA...
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...
In multichannel cognitive radio networks (CRN), the sequence of sensing order is essential to determine the efficiency of detecting an idle channel and the effective time for spectrum access. Current works on the optimal channel sensing order have to know priori knowledge such as the channel idle probabilities, channel gains and achievable rates of different channels, which dynamically evolve and...
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...
Remote screening has been under consideration for a number of years and draws upon technology solutions already deployed in hold baggage screening. It provides the opportunity for greater utilisation of costly x-ray screening equipment and the associated benefits of faster throughput and reduced operating costs. However, such changes also have a significant impact on other parts of the system. The...
In this work, we present a simplified successive cancellation list decoder that uses a Chase-like decoding process to achieve a six time improvement in speed compared to successive cancellation list decoding while maintaining the same error-correction performance advantage over standard successive-cancellation polar decoders. We discuss the algorithm and detail the data structures and methods used...
The packet scheduling problem has been deeply studied for lot of years by researchers in the computer science and telecommunications fields as an important solution that decides the order in which packets are sent over a link in order to provide QoS on a network. Recently, the packet scheduling has become again a challenging topic due to the massive use of wireless technologies (e.g. WiFi, LTE, 4G/5G),...
Wireless Sensor Network (WSN) is consisting of independent and distributed sensors to monitor physical or environmental conditions, such as temperature, sound, pressure, etc. Routing protocols represent an essential aspect of the performance of mobile wireless networks. This paper presents a comparative analysis between several routing algorithms and their impact on the performance of WSN. The performance...
Sum feedback rate can be a bottleneck for codebook-based multiple-input-multiple-output (MIMO) beamforming. So we propose a scheme using pseudorandom beamforming vectors and a threshold for feedback to address this problem. In our scheme, the basestation produces beamforming vectors in a pseudorandom way, and user calculates the angle between the beamforming vectors and its channel state information...
The design of wireless embedded systems needs their efficient and realistic simulation to verify that requirements are met. The reproduction of communication behavior is crucial to assess the performance of hardware and software components, e.g., dependability and energy consumption. This work presents and discusses different levels of abstraction for the simulation of the communication behavior....
The W-LAN Ad Hoc network tends to cause problems called “Hidden Node” and “Exposed Node”. RTS/CTS mechanism has been introduced to mitigate Hidden Node and most of existing researches assume that RTS and CTS are sent at the same transmission range. This paper describes a new method to improve the network throughput by adjusting the RTS transmission range. The simulation result showed that the proposed...
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...
In wireless multi-hop networks, content servers are generally located outside a wireless multi-hop network and a user accesses these servers through a gateway node. So, content traffic has a tendency to be concentrated at a gateway node, which might cause throughput degradation in a whole wireless multi-hop network. Caching network is one promising way to resolve this technical problem. However, caching...
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...
Recently, cognitive radio (CR) has gained a lot of attention with its spectrum sensing feature, because it provides better spectrum utilization in wireless communication. The spectrum sensing plays a major role in CR. In this paper, a new technique of spectrum sensing is proposed in which optimal Bayesian detector is used to detect the presence of M-ary quadrature amplitude modulated primary signal...
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