Multi-user and multi-business lead to dense deployment relay stations in the relay-assisted cellular system. When active relay stations exceed actual needs, decreasing the network energy efficiency has direct correlation with web users, business, distribution and other parameters. In the case that satisfying requirements of service quality, such as delay and rate are satisfied, this paper mainl...

Relay networks enhance the system performance by creating cooperative diversity gain and extend communication range by relaying the received signal to other devices. In this paper, the performance of two-relay networks is analyzed by adopting decode-andforward (DF) relaying protocol. The signaling scheme uses partially differential modulation which applies coherent modulation in source-relays l...

Validation and diagnosis of relay operation is very important to protection engineers in fault analysis. This paper presents development of an expert system based automated analysis solution, which performs validation and diagnosis of digital protective relay operation in great detail by analyzing data contained in various relay reports and files. In the system, forward chaining reasoning is us...

In cooperative relay networks with multiple users and multiple potential relays, which relay nodes are selected has great impact on the system performance. It is an optimization problem for selecting suitable relay nodes. The exhaustive search can solve this problem but the complexity will increase factorially with the network size, i.e., the number of users and the number of relays in the netw...

In this work, we investigate the stability region, the throughput performance, and the queueing delay of an asymmetric relay-assisted cooperative random access wireless network with multipacket reception (MPR) capabilities. We consider a network of N saturated source users that transmit packets to a common destination node with the cooperation of two relay nodes. The relays are equipped with in...

Recently, there is a strong demand for higher speed data transmissions in cellular mobile communications systems. However, there will be a serious problem; as data transmission rate becomes higher, the peak transmit power becomes larger. To decrease the peak transmit power while increasing the data transmission rate, the cell size should be made significantly small. We proposed a virtual cellul...

1 INTRODUCTION This paper relates to a new protection paradigm where corrective, adaptive and predictive relaying features are introduced. The value of corrective relay operation can be assessed by looking at the situations when relay mis-operations occur. Analysis of recent historical blackouts has revealed that the power system catastrophic events happened following consecutive cascading even...