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Among power generation, transmission and use, distribution is an extremely important link. The distribution system includes a transformer and a variety of high and low voltage electrical equipment, the circuit breaker is a large amount of electrical appliances. The circuit breaker can be used to distribute electric energy, the asynchronous motor is not frequently started and the power line and motor...
With the tremendous volume explosion of big data video contents in future wireless networks, ensuring Quality of Experience (QoE) of the End User (EU) by leveraging communication context becomes an important issue. In this paper, we propose a context-aware wireless multimedia relay solution to incentivize user devices participating in wireless relay services. In this proposed approach, QoE and price...
In this paper, the security of multi-input single- output (MISO) amplify-and-forward relaying network with untrustworthy relay nodes is considered, where the untrustworthy nodes can help to forward the received signal and they may also try to decode such information, which can be regarded as potential eavesdroppers (Eves). To deal with such kind of smarter Eves, relay selection is adopted and both...
In this paper, we consider a network where an access point (AP) wirelessly transfers energy to user equipments (UEs) and UEs use the harvested energy to communicate with the AP. Due to different radio propagation losses, the UEs far from the AP harvest little but consume much, thus suffering high transmission delay, while the UEs close to the AP has redundant energy. To reduce the average delay, we...
In this paper, we study a wireless-powered cooperative relaying system which consists of a source node (SN), a relay node (RN) and a destination node (DN). The RN has no embedded power supply, thus it needs to harvest energy from the radio signal transmitted by a power beacon (PB) which is responsible for charging the RN before forwarding the information to the DN. In addition, we assume that the...
In this paper, we investigate energy cooperation among sustainable cooperative relay nodes, which adopt decode- and-forward (DF) relaying. The relay nodes work on either information decoding (ID) mode or energy harvesting (EH) mode when receiving the signal from the source. Due to different harvested energy at the relay nodes, effective energy cooperation can benefit the energy efficiency, but suffer...
We present optimization algorithm for relay (RLY) selection and, source (SRC) and RLY power allocations in a cooperative multicast millimeter-wave (mmWave) system with non-line-of-sight (non-LoS) sensing. We show that there is a significant benefit to the system outage performance by allocating powers for the SRC and the RLYs selected from the candidates availing of line-of-sight (LoS) paths. Specifically,...
This paper investigates the ergodic secrecy capacity (ESC) of multiple-antenna amplify-and-forward relay systems, where one eavesdropper can wiretap the relay. To reveal the capability of the multiple- antenna relay in improving the secrecy performance, we derive new tight closed-form lower bounds of the ESC for two secure transmission schemes: artificial noise aided precoding (ANP) and eigen-beamforming...
In this paper, the mode selection (underlay or overlay) for device-to-device (D2D) links at low layers is jointly analyzed with the video coding mode selection and multiple transmission path selection at high layers. For each packet, three video coding modes (I, P, and B) and three transmission paths (cellular link with/without the shared relay and D2D link) are considered to optimize the received...
This paper analyzes the selection of underlay (reuse mode) or overlay (dedicated mode) for device-to-device (D2D) communication in a multi-cell scenario with shared relays. Two reuse cases that D2D communication reuses the same uplink resources or downlink resources as for cellular communication are considered. The study focuses on the location changes of cellular user, the distance changes of D2D...
In this paper, beam steerable antenna is deployed in mobile relay station (MRS) on vehicles to increase the link reliability and system flexibility in mobility. With only a single radio frequency (RF) chain, various beam patterns can be formed and selected electronically in a simple and low cost way. We proposed beam switching mechanism to mitigate neighboring interference and improve handover performance...
Mobile relay-assisted forwarding can improve the network capacity, but meanwhile increase the energy consumption. In this paper, we propose two distance-based energy-efficient opportunistic forwarding (DEEOF) schemes in mobile delay tolerant networks (DTNs). The proposed schemes strike a balance between energy consumption and network performance by maximizing the energy efficiency while maintaining...
Opportunistic forwarding assisted by mobile relays is an effective way of improving network capacity and packet delivery ratio in delay tolerant networks (DTNs). However, such performance gain comes at the price of increased energy consumption due to the duplicated transmissions at relays. In this paper, we investigate how energy harvesting, a promising technique of enabling sustainable communications,...
D2D communication in LTE-A cellular networks can improve overall system performance such as throughput and power consumption substantially and can enable and enhance many proximity based applications. This research topic gains great interest in both academic and industrial fields in recent years. The relevant 3GPP standardization on D2D communication has already begun in several discussion groups...
In this paper, a new radiation pattern reconfigurable antenna is designed for mobile relay station (MRS) on vehicles to increase the link reliability and system flexibility in mobility. With only a single radio frequency (RF) chain, various beam patterns can be formed and selected electronically in a simple way. The design and corresponding beam switching mechanism are demonstrated through an experimental...
Extreme physical conditions in the deep space environment result in the severe challenge of unreliable deep-space data communications. Moreover, high data rate services such as Earth-Mar multimedia communication in space exploration applications consume significant amount of energy, while the limited battery energy storage forms another communication bottleneck. To overcome these challenges, we propose...
This paper investigates the resource allocation problem in a relay-aided cognitive radio (CR) system under the orthogonal frequency division multiplexing (OFDM) transmission. Different from the conventional CR resource allocation problem, the relay node here is capable of performing subcarrier permutation over two hops such that the signal received over a particular subcarrier is forwarded on a different...
In this paper, we present a cooperative transmission approach to reduce the end-to-end delay in the context of AODV based multi hop wireless networks. The underneath idea is to effectively increase the average reach of each hop so that data packets can arrive at the destination in less number of hops with lower end-to-end delay. The existing approaches of increasing transmitted power are not effective...
This paper proposes a joint relay selection and power allocation scheme for bidirectional asymmetric traffic to minimize the weighted energy consumed per bit transmitted. The scheme can be applied to both one-way and two-way Amplify-and-Forward (AF) relay networks. In the scheme, close-form solutions for energy efficient power allocation are derived with perfect channel state information at each relay...
This paper investigates the one-side interference channel with relay under the exponential power allocation. Usually, the transmitted power linear scaling with the maximum power is used. In this paper, an exponential power allocation is proposed, in which, the transmitted power of each node is presented by an exponential function of the maximum transmitted power with a coefficient. With the exponential...
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