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Signal software for high-speed railways is safetycritical, controlling communications between trains, tracks, stations, and signals. It is necessary to test railway signal software rigorously. However, ad-hoc approaches still dominate in practice. We proposed a hybrid approach that uses combinatorial testing (CT) and model-based testing (MBT). We applied this systematic approach to testing track circuit...
A track circuit is a critical component of a modern railway system. The circuit is used to detect the absence of a train on rail tracks and produce corresponding control signals. A railway track has many block sections, each of which has a separate track circuit device. A track circuit receiver analyzes signals sent from a track circuit sender and produces a signal to control a relay. When the train...
We consider a scenario consisting of a primary and a secondary system, each represented by a pair of a transmitter and a receiver. The secondary transmitter assists in the retransmission of the primary message, which prevents the primary performance from being degraded by allowing the secondary system to access the transmission resources. Two network coding schemes applied in retransmission phase...
In this paper, the nonlinear optimal control problem is formulated as a multi-objective mathematical optimization problem. Harmony search (HS) algorithm is one of the new heuristic algorithms. The HS optimization algorithm is introduced for the first time in solving the fault section estimation performance in power systems. A case on optimal estimation for fault section in the part of the 230KV Southern...
Opportunistic relaying is an important relay selection scheme for cooperative communication, it can dynamically select relay depending on instantaneous channel condition, which is a especially suitable for distributed networks. Some cooperative MAC based on opportunistic relaying have been proposed to enhance the system throughput. However, since the throughput is normally related to their energy...
Opportunistic relaying is an important relay selection scheme for cooperative communication, which can dynamically select relay depending on instantaneous channel condition. A great deal of research has been conducted to study opportunistic relaying from the viewpoint of PHY layer and information theory. However, owing to the impact resulting from opportunistic relaying, there is no guarantee to enhance...
The paper presents a cooperative MAC based on opportunistic relaying for ad hoc networks. In the proposed MAC, the cooperative scheme will be activated on the condition that the source contended the channel successful, but the destination receives the inaccurate packets because of the channel noise. Based on opportunistic relaying, the neighbor which has the best channel condition to the destination...
In this paper, we consider a collaborative routing strategy in cognitive radio network. We define a system model and a pricing scheme as a means to stimulate cooperation in users. Assuming that cognitive radio base station sets prices for the network profit maximization according to the interferences caused by secondary users to primary users, we propose an iterative price adaptation algorithm to...
In this paper, we present a cooperative MAC protocol called automatic relay cooperative MAC (ARC-MAC) for wireless Ad Hoc networks. ARC-MAC develops the 802.11 DCF to five handshakes, which is suitable for cooperative transmission. According to the channel condition, neighbors decide whether it is a relay by itself, and the relay helps the source transmitting packets with a definite probability. An...
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