A New Multiple Gateway Transmit Diversity Technique for Future Satellite Networks

The next generation of High Throughput Satellite(HTS)will exploit Q/V band for the feeder link and Ka band for the user link.The exploitation of multiple gateways(GWs)is a transmit diversity measure to compensate severe rain attenuation of Q/V band feeder links.This paper introduces a new smart gateway diversity combination scheme that combinates N-active(K=2)and N+1 diversity method in detail from the working principle,gateway switching strategy,evaluation of system availability and implementation complexity.In addition,a feeder link outage event prediction algorithm featuring combination scheme is given detailly based on modified time-adaptive linear regression.Compared with the existing N+P scheme,the proposed scheme can provide higher system availability and more stable user’s experience under the condition of properly increasing the complexity of payload design.Compared with Nactive scheme that has been reported,it is much easier to implement in engineering and more cost-effective.As a result,the combination scheme is a realistic solution based on a trade-off between performance improvement and implementation complexity.

Smart Home Gateway Based on ZigBee Technology

Smart home gateway is the information exchange hub between the family network and external network which can accept signals from different external communication networks, transmit signals to a smart home devices to control and manage the home network through the smart home network internal devices. The smart home gateway design technology based on ZigBee is proposed through integrated network communication technology and embedded technology, and this paper describes the design and implementation of man controller, ZigBee communication module, an Ethernet interface and a wireless communication interface.

Game strategies for distributed denial of service defense in the Cloud of Things

Integration of the IoT(Internet of Things)with Cloud Computing,termed as the CoT(Cloud of Things)can help achieve the goals of the envisioned IoT and future Internet.In a typical CoT infrastructure,the data collected from wireless sensor networks and IoTs is transmitted through a SG(Smart Gateway)to the cloud.The bandwidth between an IoT access point and SG becomes a bottleneck for information transmission between the IoT and the cloud.We propose a novel game theory model to describe the CoT attacker,who expects to use minimum set and energy consumption of IoT attack devices to occupy as many bandwidth resources as possible in a given time period;and the defender,who expects to minimize false alarms.By analyzing this model,we have found that the game theory model is a non-cooperative and repeated incomplete information game,and Nash equilibrium is existent,perfected by the subgame.The best strategy for each stage of the attack is to adjust the attack link number dynamically based on the comparison results of value E and turning point E_(0)for each time period.At the same time,the defender adjusts the threshold valueβdynamically,based on the comparison results of the Load value and expected value ofαfor each time period.The simulation result shows that our strategy can significantly mitigate the harm of a distributed denial of service attack.