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In this paper, an improved cooperative jamming (CJ) strategy is developed for physical layer (PHY) security in a multi-hop wireless communication system which employs beamforming in the last hop. Users are assigned to independent groups based on the merger-and-split rule in a coalition game. The secrecy capacity for a valid coalition is a non-convex optimization problem which cannot easily be solved...
In delay tolerant networks (DTNs), the delivery rate and delivery speed are restricted by node selfishness. To promote the delivery rate and reduce the delivery delay in DTNs, we propose a hybrid incentive trade model (HITM), which uses reputation compensation to stimulate nodes to give up their temporary benefits and transfer their forwarding missions to other more qualified nodes. Furthermore, HITM...
In this paper, we investigate the performance of Nth best relay selection networks with secrecy constraints where several eavesdroppers try to overhear the source message. In order to enhance the network security, a single jammer is introduced to jam the eavesdroppers. In addition, sub-optimal selection strategy is introduced to combat the malicious attempt of eavesdroppers. We derive the exact secrecy...
A relay solution to link-blockage problem in 60GHz communication systems is proposed based on codebook beam switching. The directional link is easily blocked by a moving person and furniture, which is regarded as one of the severe problems in 60GHz systems. Beam switching mechanism is feasible to resolve link-blockage by switching beams from the blocked path to an optimal relay path. Typically, the...
In this paper, a novel antenna selection strategy is proposed and analyzed for dual hop MIMO cognitive amplify-and-forward (AF) relay networks over independent non-identically distributed (i.n.i.d.) Nakagami-m fading channels. Spectrum sharing is employed with secondary users constrained by a limit on the interference to the primary receivers. All secondary users are equipped with multiple antennas...
In this paper, we present a new architecture to mitigate inter-cell interference in the uplink and improve the uplink capacity of Long Term Evolution (LTE), which is named LTE-based multi-hop cellular networks with out-of-band relaying. Based on the receiving reference signal strength of User Equipments (UEs), each cell is divided into two parts, the inner circle and the outer ring. Each UE is dual-mode...
This study considers an orthogonal frequency-division multiple-access (OFDMA)-based multi-user two-way relay network where multiple mobile stations (MSs) communicate with a common base station (BS) via multiple relay stations (RSs). We study the joint optimization problem of subcarrier-pairing based relay-power allocation, relay selection, and subcarrier assignment. The problem is formulated as a...
Transformer is one of the most important elements in power system, and current differential protection has been the main protection technique for transformer unit. This protection technique, however, suffers a low sensitivity or reliability due to the problems such as CT saturation and transformer magnetizing inrush. Based on digital substation system, studies have found that the fault generated electric...
Transformer is one of the most important elements in power system, but the correct operation percentage of protection relay is far less than that for line protection. Current differential protection has been the main protection technique for transformer unit. This protection technique, however, suffers a low sensitivity or reliability due to the problems such as CT saturation and transformer magnetizing...
A back-up protection scheme for a distribution network is described in the paper. The progresses in microprocessor, communication and transducer technologies have provided new means for the design and development of new generation of algorithms and devices in power system. Studies have found that the fault generated electric quantities can not only be detected by integrated relay to achieve the line...
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