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The issues of turn-on performance of a high power insulated gate bipolar transistor (IGBT) that works in hard switching conditions are discussed in detail. First, the turn-on delay time, switching loss, reverse recovery current of the associated free-wheeling diode, and EMI noise are analyzed for an IGBT phase-leg module with an inductive load. Based on the analysis, a novel gate drive circuit combining...
As a new wireless network access technology, IEEE 802.16 can provide broadband Internet connection to user. However, it was found that the mandatory contention resolution scheme in IEEE 802.16 can not run perfectly in most cases, especially when the traffic is heavy. In this paper, a novel self-adaptive truncated binary exponential backoff scheme has been proposed to improve the performance of the...
As a new wireless network access technology, IEEE 802.16 can provide broadband Internet connection to user. Five types of services that can provide QoS support for a wide range of applications had been defined in IEEE 802.16 standards. Some papers had discussed the QoS architecture of WiMAX, but little attention had been thrown to nrtPS and BE services. In this paper, a novel waiting queue based bandwidth...
Currently, the truncated binary exponential backoff based scheme had been defined as the mandatory contention resolution scheme in WiMAX standards. However, it had been discussed in many research that these schemes can not work perfectly with WiMAX in most cases. In this paper, a novel N modules based self-adaptive contention resolution scheme has been proposed, which divides all Subscriber Stations...
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