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Contention-based distributed synchronization (CDS) protocols, which first standardized in the IEEE 802.11 power saving mode (PSM), have been widely used in wireless ad hoc networks. The time required to complete the synchronization progress, i.e., synchronization efficiency, is obviously an important performance metrics for CDS protocols. However, few attempts have been focusing on modeling and analyzing...
In this study, the problem of energy-efficient power allocation (EEPA) for secrecy wireless information and power transfer in a massive multiple-input multiple-output relay aided secure communication system is well addressed. The relay forwards the signal sent from a source to a legitimate destination with the harvested energy based on a decode-and-forward relaying protocol, while a passive eavesdropper...
In this paper, we address the problem of energy-efficient power allocation for secure communications in an amplify-and-forward (AF) large-scale multiple-input multiple-output (LS-MIMO) relaying system in presence of a passive eavesdropper. The benefits of an AF LS-MIMO relay are exploited to significantly improve the secrecy performance, especially the secrecy energy efficiency (bit per Joule). We...
In this paper, we focus on improving concurrent MAC (CMAC) protocol performance in multi-hop ad hoc networks. Based on the analysis of the collision problems and multi-rate problems of the distributed coordination function (DCF) and CMAC protocol in multi-hop ad hoc networks, we propose a rate adaptive scheme for improving CMAC protocol performance. The scheme allows nodes to adaptively select appropriate...
in this paper, we study the power control strategy in wireless ad hoc networks. First the paper analyses the energy saving principles of basic power control and PCM protocol. Then it further explains the implementation in GloMoSim. Finally, simulation results are provided to evaluate the performance of these power control strategies. The simulation results show that, to some extent, these power control...
In this paper we focus on the 0/1 fairness problem of the DCF protocol in multi-hop ad hoc network. We find that the DCF protocol can not avoid the carrier interference produced by the interference transmitter to the receiver, when the interference transmitter locates in the collision interference range of the receiver and out of the carrier sensing range of the transmitter. This is the primary cause...
In this paper we focus on the concept of IEEE 802.11 DCF error frame model. Based on the analysis of the model in detail, we point out the error of the simulation algorithm of the DCF error frame model in QualNet simulation environment. Furthermore, we modify the simulation algorithm in QualNet strictly according to the specifications of the DCF error frame model. The simulation results show that...
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