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This paper develops an analytical model for analyzing the access performance of the IEEE 802.11p EDCA mechanism. A 2-D Markov chain is first constructed to describe the backoff procedure of an AC queue and establish a relationship between the transmission probability and collision probability of the AC queue. Then a 1-D infinite discrete-time Markov chain is constructed to describe the contention...
In the existing cooperative cognitive radio (CR), qualities of service (e.g., rate or outage probability) of primary users can be improved by cooperative transmission from secondary users. However, as owners of the spectrum, primary users' traffic demands are relatively easy to satisfy. The rationale is that they would be more interested in the benefits of other formats (e.g., revenue), rather than...
Network propagation delay and system parameters are always changing, to this case, the paper applied sliding mode control theory to set reasonable output bandwidth in dynamic network for XCP, and thus to compensate the uncertainty existing in the feedback factor. The source adjusted the sending rates according to it so that the network output could have high throughput and a smaller queue length....
This article describes the working principle and driving schedule of Three-phase bridge inverter, proposing a PWM Control Realization method which Duty Cycle is adjustable and the delay time of the switch tube on and off can be preset. The generator uses CPLD for hardware foundation, and based on VHDL hardware description language for the simulation test in Max+Plus□.The PWM controller which uses...
After studying the status of Anqing petrochemical industry and analyzing its advantages and disadvantages, I suggest that the S.O.(Strength and Opportunity) should be taken as the Anqing Petrochemical Industry development strategy so as to make Anqing become another important national petrochemical industry base with a prominent feature and strong competitive ability.
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