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In this paper, a compact planar current sensor is developed to be used in active current balancing applications for parallel-connected Silicon Carbide (SiC) MOSFETs. The designed Rogowski coil allows non-intrusive current measurement with low profile, compact size, and high bandwidth. The sensor circuit design extends both lower and higher cutoff frequency of the sensor, and allows a continuous measurement...
The femtocell network is regarded as an effective approach to provide better services for indoor users with higher capacity. However, the spectrum allocation problem of the femtocell network is challenging for the wireless operator, since the added femtocell tier either requires additional spectrum resource or brings interference to the existing cellular network. In this paper, we consider the methods...
The sidelobe of noncontiguous orthogonal frequency-division multiplexing (OFDM) signals is required to be deeply suppressed in the licensed user's band in cognitive radio (CR) systems. To this end, we propose a novel method of adding extended active interference cancellation (EAIC) signals to suppress sidelobes and to shape the spectrum of the CR-OFDM signal with a cyclic prefix (CP). For simplicity,...
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...
As a new wireless network access technology, WiMAX can provide broadband Internet connection to user. However, the standards do not mention how to allocate bandwidth to different applications and how to improve the performance of the whole network. In this paper, a Time Division Duplexing based bandwidth requesting and allocating model had been proposed to analyze the work process of bandwidth requesting...
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