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The information transmission problem in a class of wireless multi-user single-antenna half-duplex relay interference networks is studied. In these networks there are multiple clusters of sources. All the terminals in each source cluster desire to transmit independent messages to a single destination, through multiple layers of intermediate half-duplex relays. We adopt a cluster successive relaying...
Due to its own features including variability of network topology, instable vehicle density and so on, Vehicular Ad hoc Networks (VANETs) can hardly guarantee efficient and reliable network connectivity which plays an important role in data dissemination. Compared with VANET, cellular networks is of great advantage to provide timely data propagation. To solve the problem of disconnection in VANET,...
Mobile social network (MSN) has been widely studied as a novel and effective way for communication in the current era of fast developing mobile devices, which enables the contents and services to be delivered opportunistically when mobile users contact. In this paper, we aim to optimize the content delivery from the content provider (CP) to the subscribers via relays in between. Tandem queueing model...
In recent years, the multiple-input-multiple-output (MIMO), the orthogonal frequency division multiplexing (OFD- and the relay communication techniques have significantly improved the important performance of radio wireless communication networks. Due to its wide and critical applications, we can also apply these techniques into the underwater acoustic (UWA) wireless networks. In this paper, we propose...
In recent years, the MIMO-based underwater acoustic (UWA) wireless sensor networks have attracted significant research attention because of its wide and critical applications in marine research, oceanography, marine commercial operations, offshore oil industry, and defense systems. The cooperativecommunications- based wireless relay networks have been widely cited as a very efficient technique to...
In wireless mesh network (WMN), multiple service providers (SPs) can cooperate to share resources (e.g., relay nodes and spectrum), to serve their collective subscribed customers for better service. As a reward, SPs are able to achieve more individual benefits, i.e., increased revenue or decreased cost, through efficient utilization of shared network resources. However, this cooperation can be realized...
The next generation network with high data rate and large coverage is demanded. In the cellular network, the enhanced MIMO-OFDMA relaying technology has become one of the most promising solutions. In a relay-enhanced cellular, multiple Relay Stations (RSs) are deployed to assist transmissions between a Base Station (BS) and multiple Mobile Stations (MSs). However, the resource allocation becomes more...
Multi-path fading, one of the key factors that deteriorate quality of service (QOS) in Underwater Acoustic Networks (UANs), is investigated under different underwater scenarios in this paper. To improve the Bit Error Rate (BER) performance, the techniques of cooperative diversities are applied. Considering realistic physical model and cooperative diversity techniques, two asynchronous forwarding schemes,...
MIMO, OFDMA and cooperative relaying are the key technologies in future wireless communication systems. However, under the usage of these technologies, resource allocation becomes a more crucial and challenging task. In multi-user MIMO-OFDMA relay-enhanced cellular networks, we formulate the optimal instantaneous resource allocation problem including user group selection, path selection, power allocation,...
We consider a cognitive relay network (CRN) where the secondary users (SUs) are involved as cooperative relays in a primary user's (PU) communication. To avoid generating interference to PU transmissions, it is assumed that SUs can transmit only when the PU's channel is idle. On one hand, SUs use some relay powers to speed up the PU's transmissions. Consequently, PU's buffer will be depleted faster,...
Relay transmission or cooperative communication is an advanced technique that can improve the performance of data transmission among wireless nodes. However, while the performance (e.g., throughput) of a source node can be improved through cooperation with a number of relays, this improvement comes at the expense of a degraded performance for the relay nodes due to the resources that they dedicate...
For designing a wireless network, field test is mostly preferred for researchers to test and evaluate the system performance. However, it is expensive for field constructions and thus it is not affordable for most researchers. Software simulation is another option. However, the results by simulation may be undesirably biased away the true. This paper proposes a new method to trade off between resource...
In this contribution, the measurement scenario of relay channel is designed in indoor environment based on the measurement technology of Virtual MIMO, and three kinds of relay links are measured separately by our own real-time channel measurement platform at 2.5GHz. We analyze the characteristics of shadow fading and correlation about relay channel. The percentage error of shallow fading between each...
In cognitive mobile multihop relay (CMMR) network, the mobile user as the primary user is allocated with the channel for transmitting data. Relay station as the secondary user can help primary user to relay transmitted data while in return primary user grants channel access to secondary user. In this paper, credit-based spectrum sharing for primary and secondary user in CMMR network is proposed. With...
A parameters controllable oscillation model is constituted with ATP based on analysis of the changing pattern of oscillation current and voltage. The model covers deficiency of power system simulation tools that have no models to be used for analysis of oscillation. Protection relays which would be influenced by oscillation are classed. As a major test, detailed theoretic analysis as well as simulation...
With the significant development of wireless technologies, vehicular ad-hoc network (VANET) has gradually become the killing application for automobile industry. Many VANET systems have been developed in recent years. However, the majority of them have the assumption that all or most vehicles have wireless communication devices installed along with an elaborate road side infrastructure. This assumption...
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